ADOdb Library for PHP

v4.991 16 Oct 2008 (c) 2000-2008 John Lim (jlim#natsoft.com)

This software is dual licensed using BSD-Style and LGPL. This means you can use it in compiled proprietary and commercial products.

Useful ADOdb links: Download   Other Docs

Introduction
Unique Features
How People are using ADOdb
Feature Requests and Bug Reports
Installation
Minimum Install
Initializing Code and Connectioning to Databases
  Data Source Name (DSN) Support   Connection Examples
High Speed ADOdb - tuning tips
Hacking and Modifying ADOdb Safely
PHP5 Features
foreach iterators exceptions
Supported Databases
Tutorials
Example 1: Select
Example 2: Advanced Select
Example 3: Insert
Example 4: Debugging  rs2html example
Example 5: MySQL and Menus
Example 6: Connecting to Multiple Databases at once
Example 7: Generating Update and Insert SQL
Example 8: Implementing Scrolling with Next and Previous
Example 9: Exporting in CSV or Tab-Delimited Format
Example 10: Custom filters
Example 11: Smart Transactions

Using Custom Error Handlers and PEAR_Error
Data Source Names
Caching
    MemCache
    Caching API
Pivot Tables

REFERENCE

Variables: $ADODB_COUNTRECS $ADODB_ANSI_PADDING_OFF $ADODB_CACHE_DIR
        $ADODB_FORCE_TYPE $ADODB_FETCH_MODE $ADODB_LANG ADODB_QUOTE_FIELDNAMES
Constants: ADODB_ASSOC_CASE
ADOConnection
Connections: Connect PConnect NConnect IsConnected
Executing SQL: Execute CacheExecute SelectLimit CacheSelectLimit Param Prepare PrepareSP InParameter OutParameter AutoExecute
              GetOne CacheGetOne GetRow CacheGetRow GetAll CacheGetAll GetCol CacheGetCol GetAssoc CacheGetAssoc Replace
               ExecuteCursor (oci8 only)
Generates SQL strings: GetUpdateSQL GetInsertSQL Concat IfNull length random substr qstr Param OffsetDate SQLDate DBDate DBTimeStamp BindDate BindTimeStamp
Blobs: UpdateBlob UpdateClob UpdateBlobFile BlobEncode BlobDecode
Paging/Scrolling: PageExecute CachePageExecute
Cleanup: CacheFlush Close
Transactions: StartTrans CompleteTrans FailTrans HasFailedTrans BeginTrans CommitTrans RollbackTrans SetTransactionMode
Fetching Data: SetFetchMode
Strings: concat length qstr quote substr
Dates: DBDate DBTimeStamp UnixDate BindDate BindTimeStamp UnixTimeStamp OffsetDate SQLDate
Row Management: Affected_Rows Insert_ID RowLock GenID CreateSequence DropSequence
Error Handling: ErrorMsg ErrorNo MetaError MetaErrorMsg IgnoreErrors
Data Dictionary (metadata): MetaDatabases MetaTables MetaColumns MetaColumnNames MetaPrimaryKeys MetaForeignKeys ServerInfo
Statistics and Query-Rewriting: LogSQL fnExecute and fnCacheExecute
Deprecated: Bind BlankRecordSet Parameter
ADORecordSet
Returns one field: Fields
Returns one row:FetchRow FetchInto FetchObject FetchNextObject FetchObj FetchNextObj GetRowAssoc
Returns all rows:GetArray GetRows GetAssoc
Scrolling:Move MoveNext MoveFirst MoveLast AbsolutePosition CurrentRow AtFirstPage AtLastPage AbsolutePage
Menu generation:GetMenu GetMenu2
Dates:UserDate UserTimeStamp UnixDate UnixTimeStamp
Recordset Info:RecordCount PO_RecordCount NextRecordSet
Field Info:FieldCount FetchField MetaType
Cleanup: Close

rs2html  example
Differences between ADOdb and ADO
Database Driver Guide
Change Log

Introduction

PHP's database access functions are not standardised. This creates a need for a database class library to hide the differences between the different database API's (encapsulate the differences) so we can easily switch databases. PHP 4.0.5 or later is now required (because we use array-based str_replace).

We currently support MySQL, Oracle, Microsoft SQL Server, Sybase, Sybase SQL Anywhere, Informix, PostgreSQL, FrontBase, SQLite, Interbase (Firebird and Borland variants), Foxpro, Access, ADO, DB2, SAP DB and ODBC. We have had successful reports of connecting to Progress and CacheLite via ODBC. We hope more people will contribute drivers to support other databases.

PHP4 supports session variables. You can store your session information using ADOdb for true portability and scalability. See adodb-session.php for more information.

Also read tips_portable_sql.htm for tips on writing portable SQL.

Unique Features of ADOdb

• Easy for Windows programmers to adapt to because many of the conventions are similar to Microsoft's ADO.
• Unlike other PHP database classes which focus only on select statements, we provide support code to handle inserts and updates which can be adapted to multiple databases quickly. Methods are provided for date handling, string concatenation and string quoting characters for differing databases.
• A metatype system is built in so that we can figure out that types such as CHAR, TEXT and STRING are equivalent in different databases.
• Easy to port because all the database dependant code are stored in stub functions. You do not need to port the core logic of the classes.
• Portable table and index creation with the datadict classes.
• Database performance monitoring and SQL tuning with the performance monitoring classes.
• Database-backed sessions with the session management classes. Supports session expiry notification.
• Object-Relational Mapping using ADOdb_Active_Record classes.

How People are using ADOdb

• PhpLens is a commercial data grid component that allows both cool Web designers and serious unshaved programmers to develop and maintain databases on the Web easily. Developed by the author of ADOdb.

• PHAkt: PHP Extension for DreamWeaver Ultradev allows you to script PHP in the popular Web page editor. Database handling provided by ADOdb.

• Analysis Console for Intrusion Databases (ACID): PHP-based analysis engine to search and process a database of security incidents generated by security-related software such as IDSes and firewalls (e.g. Snort, ipchains). By Roman Danyliw.

• PostNuke is a very popular free content management system and weblog system. It offers full CSS support, HTML 4.01 transitional compliance throughout, an advanced blocks system, and is fully multi-lingual enabled.

• EasyPublish CMS is another free content management system for managing information and integrated modules on your internet, intranet- and extranet-sites. From Norway.

• NOLA is a full featured accounting, inventory, and job tracking application. It is licensed under the GPL, and developed by Noguska.

Feature Requests and Bug Reports

Feature requests and bug reports can be emailed to jlim#natsoft.com or posted to the ADOdb Help forums at http://phplens.com/lens/lensforum/topics.php?id=4.

Installation Guide

Make sure you are running PHP 4.0.5 or later. Unpack all the files into a directory accessible by your webserver.

To test, try modifying some of the tutorial examples. Make sure you customize the connection settings correctly. You can debug using $db->debug = true as shown below:

<?php
	include('adodb/adodb.inc.php');
	$db = ADONewConnection($dbdriver); # eg 'mysql' or 'postgres'
	$db->debug = true;
	$db->Connect($server, $user, $password, $database);
	$rs = $db->Execute('select * from some_small_table');
	print "<pre>";
	print_r($rs->GetRows());
	print "</pre>";
?>

Minimum Install

For developers who want to release a minimal install of ADOdb, you will need:

• adodb.inc.php
• adodb-lib.inc.php
• adodb-time.inc.php
• drivers/adodb-$database.inc.php
• license.txt (for legal reasons)
• adodb-php4.inc.php
• adodb-iterator.inc.php (php5 functionality)

• adodb-error.inc.php and lang/adodb-$lang.inc.php (if you use MetaError())
• adodb-csvlib.inc.php (if you use cached recordsets - CacheExecute(), etc)
• adodb-exceptions.inc.php and adodb-errorhandler.inc.php (if you use adodb error handler or php5 exceptions).
• adodb-active-record.inc.php if you use Active Records.

Code Initialization Examples

When running ADOdb, at least two files are loaded. First is adodb/adodb.inc.php, which contains all functions used by all database classes. The code specific to a particular database is in the adodb/driver/adodb-????.inc.php file.

For example, to connect to a mysql database:

include('/path/to/set/here/adodb.inc.php');
$conn = &ADONewConnection('mysql');

Whenever you need to connect to a database, you create a Connection object using the ADONewConnection($driver) function. NewADOConnection($driver) is an alternative name for the same function.

At this point, you are not connected to the database (no longer true if you pass in a dsn). You will first need to decide whether to use persistent or non-persistent connections. The advantage of persistent connections is that they are faster, as the database connection is never closed (even when you call Close()). Non-persistent connections take up much fewer resources though, reducing the risk of your database and your web-server becoming overloaded.

For persistent connections, use $conn->PConnect(), or $conn->Connect() for non-persistent connections. Some database drivers also support NConnect(), which forces the creation of a new connection.

Connection Gotcha: If you create two connections, but both use the same userid and password, PHP will share the same connection. This can cause problems if the connections are meant to different databases. The solution is to always use different userid's for different databases, or use NConnect().

Data Source Name (DSN) Support

Since ADOdb 4.51, you can connect to a database by passing a dsn to NewADOConnection() (or ADONewConnection, which is the same function). The dsn format is:

	$driver://$username:$password@hostname/$database?options[=value]

NewADOConnection() calls Connect() or PConnect() internally for you. If the connection fails, false is returned.

	# non-persistent connection
	$dsn = 'mysql://root:pwd@localhost/mydb'; 
	$db = NewADOConnection($dsn);
	if (!$db) die("Connection failed");   
	
	# no need to call connect/pconnect!
	$arr = $db->GetArray("select * from table");
	
	# persistent connection
	$dsn2 = 'mysql://root:pwd@localhost/mydb?persist'; 

If you have special characters such as /:?_ in your dsn, then you need to rawurlencode them first:

	$pwd = rawurlencode($pwd);
	$dsn = "mysql://root:$pwd@localhost/mydb";
	$dsn2=rawurlencode("sybase_ase")."://user:pass@host/path?query";

Legal options are:

For all drivers	'persist', 'persistent', 'debug', 'fetchmode', 'new'
Interbase/Firebird	'dialect','charset','buffers','role'
M'soft ADO	'charpage'
MySQL	'clientflags'
MySQLi	'port', 'socket', 'clientflags'
Oci8	'nls_date_format','charset'

For all drivers, when the options persist or persistent are set, a persistent connection is forced; similarly, when new is set, then a new connection will be created using NConnect if the underlying driver supports it. The debug option enables debugging. The fetchmode calls SetFetchMode(). If no value is defined for an option, then the value is set to 1.

ADOdb DSN's are compatible with version 1.0 of PEAR DB's DSN format.

Examples of Connecting to Databases

MySQL and Most Other Database Drivers

MySQL connections are very straightforward, and the parameters are identical to mysql_connect:

	$conn = &ADONewConnection('mysql'); 
	$conn->PConnect('localhost','userid','password','database');
	
	# or dsn 
	$dsn = 'mysql://user:pwd@localhost/mydb'; 
	$conn = ADONewConnection($dsn);  # no need for Connect()
	
	# or persistent dsn
	$dsn = 'mysql://user:pwd@localhost/mydb?persist'; 
	$conn = ADONewConnection($dsn);  # no need for PConnect()
	
	# a more complex example:
	$pwd = urlencode($pwd);
	$flags =  MYSQL_CLIENT_COMPRESS;
	$dsn = "mysql://user:$pwd@localhost/mydb?persist&clientflags=$flags";
	$conn = ADONewConnection($dsn);  # no need for PConnect()
 

For most drivers, you can use the standard function: Connect($server, $user, $password, $database), or a DSN since ADOdb 4.51. Exceptions to this are listed below.

	$conn =& NewADConnection('pdo');
	$conn->Connect('mysql:host=localhost',$user,$pwd,$mydb);
	$conn->Connect('mysql:host=localhost;dbname=mydb',$user,$pwd);
	$conn->Connect("mysql:host=localhost;dbname=mydb;username=$user;password=$pwd");

	$conn =& NewADConnection("pdo_mysql://user:pwd@localhost/mydb?persist"); # persist is optional

	$conn = &ADONewConnection('postgres');  
	$conn->PConnect('host=localhost port=5432 dbname=mary');

	$conn->PConnect('localhost','userid','password','database');
 

	$dsn = 'postgres://user:pwd@localhost/mydb?persist';  # persist is optional
	$conn = ADONewConnection($dsn);  # no need for Connect/PConnect

LDAP

Here is an example of querying a LDAP server. Thanks to Josh Eldridge for the driver and this example:

require('/path/to/adodb.inc.php');

/* Make sure to set this BEFORE calling Connect() */
$LDAP_CONNECT_OPTIONS = Array(
	Array ("OPTION_NAME"=>LDAP_OPT_DEREF, "OPTION_VALUE"=>2),
	Array ("OPTION_NAME"=>LDAP_OPT_SIZELIMIT,"OPTION_VALUE"=>100),
	Array ("OPTION_NAME"=>LDAP_OPT_TIMELIMIT,"OPTION_VALUE"=>30),
	Array ("OPTION_NAME"=>LDAP_OPT_PROTOCOL_VERSION,"OPTION_VALUE"=>3),
	Array ("OPTION_NAME"=>LDAP_OPT_ERROR_NUMBER,"OPTION_VALUE"=>13),
	Array ("OPTION_NAME"=>LDAP_OPT_REFERRALS,"OPTION_VALUE"=>FALSE),
	Array ("OPTION_NAME"=>LDAP_OPT_RESTART,"OPTION_VALUE"=>FALSE)
);
$host = 'ldap.baylor.edu';
$ldapbase = 'ou=People,o=Baylor University,c=US';

$ldap = NewADOConnection( 'ldap' );
$ldap->Connect( $host, $user_name='', $password='', $ldapbase );

echo "<pre>";

print_r( $ldap->ServerInfo() );
$ldap->SetFetchMode(ADODB_FETCH_ASSOC);
$userName = 'eldridge';
$filter="(|(CN=$userName*)(sn=$userName*)(givenname=$userName*)(uid=$userName*))";

$rs = $ldap->Execute( $filter );
if ($rs)
	while ($arr = $rs->FetchRow()) {
	     print_r($arr);	
	}

$rs = $ldap->Execute( $filter );
if ($rs) 
	while (!$rs->EOF) {
 		print_r($rs->fields);	
		$rs->MoveNext();
	} 
	
print_r( $ldap->GetArray( $filter ) );
print_r( $ldap->GetRow( $filter ) );

$ldap->Close();
echo "</pre>";

Using DSN:

$dsn = "ldap://ldap.baylor.edu/ou=People,o=Baylor University,c=US";
$db = NewADOConnection($dsn);

Interbase/Firebird

	$conn = &ADONewConnection('ibase'); 
	$conn->PConnect('localhost:c:\ibase\employee.gdb','sysdba','masterkey');

Or dsn:

	$dsn = 'firebird://user:pwd@localhost/mydb?persist&dialect=3';  # persist is optional
	$conn = ADONewConnection($dsn);  # no need for Connect/PConnect

SQLite

	$conn = &ADONewConnection('sqlite');
	$conn->PConnect('c:\path\to\sqlite.db'); # sqlite will create if does not exist

Or dsn:

	$path = urlencode('c:\path\to\sqlite.db');
	$dsn = "sqlite://$path/?persist";  # persist is optional
	$conn = ADONewConnection($dsn);  # no need for Connect/PConnect

Oracle (oci8)

With oci8, you can connect in multiple ways. Note that oci8 works fine with newer versions of the Oracle, eg. 9i and 10g.

a. PHP and Oracle reside on the same machine, use default SID.

	$conn->Connect(false, 'scott', 'tiger');

b. TNS Name defined in tnsnames.ora (or ONAMES or HOSTNAMES), eg. 'myTNS'

	$conn->PConnect(false, 'scott', 'tiger', 'myTNS');

or

 	$conn->PConnect('myTNS', 'scott', 'tiger');

c. Host Address and SID

	$conn->connectSID = true;
	$conn->Connect('192.168.0.1', 'scott', 'tiger', 'SID');

d. Host Address and Service Name

	$conn->Connect('192.168.0.1', 'scott', 'tiger', 'servicename');

e. Oracle connection string:

	$cstr = "(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=$host)(PORT=$port))
			(CONNECT_DATA=(SID=$sid)))";
	$conn->Connect($cstr, 'scott', 'tiger');

f. ADOdb dsn:

	$dsn = 'oci8://user:pwd@tnsname/?persist';  # persist is optional
	$conn = ADONewConnection($dsn);  # no need for Connect/PConnect
	
	$dsn = 'oci8://user:pwd@host/sid';
	$conn = ADONewConnection($dsn);
	
	$dsn = 'oci8://user:pwd@/';   # oracle on local machine
	$conn = ADONewConnection($dsn);

You can also set the charSet for Oracle 9.2 and later, supported since PHP 4.3.2, ADOdb 4.54:

	$conn->charSet = 'we8iso8859p1';
	$conn->Connect(...);
	
	# or
	$dsn = 'oci8://user:pwd@tnsname/?charset=WE8MSWIN1252';
	$db = ADONewConnection($dsn);

DSN-less ODBC ( Access, MSSQL and DB2 examples)

ODBC DSN's can be created in the ODBC control panel, or you can use a DSN-less connection.To use DSN-less connections with ODBC you need PHP 4.3 or later.

For Microsoft Access:

	$db =& ADONewConnection('access');
	$dsn = "Driver={Microsoft Access Driver (*.mdb)};Dbq=d:\\northwind.mdb;Uid=Admin;Pwd=;";
	$db->Connect($dsn);

	$db =& ADONewConnection('odbc_mssql');
	$dsn = "Driver={SQL Server};Server=localhost;Database=northwind;";
	$db->Connect($dsn,'userid','password');

	$db =& ADONewConnection('mssql');
	$db->Execute('localhost', 'userid', 'password', 'northwind');

	$dbms = 'db2'; # or 'odbc_db2' if db2 extension not available
	$db =& ADONewConnection($dbms);
	$dsn = "driver={IBM db2 odbc DRIVER};Database=sample;hostname=localhost;port=50000;protocol=TCPIP;".
				"uid=root; pwd=secret";
	$db->Connect($dsn);

<?php
	include('adodb.inc.php'); 
	$db = &ADONewConnection("ado_mssql");
	print "<h1>Connecting DSN-less $db->databaseType...</h1>";
		
	$myDSN="PROVIDER=MSDASQL;DRIVER={SQL Server};"
		. "SERVER=flipper;DATABASE=ai;UID=sa;PWD=;"  ;
	$db->Connect($myDSN);
	
	$rs = $db->Execute("select * from table");
	$arr = $rs->GetArray();
	print_r($arr);
?>

High Speed ADOdb - tuning tips

ADOdb is a big class library, yet it consistently beats all other PHP class libraries in performance. This is because it is designed in a layered fashion, like an onion, with the fastest functions in the innermost layer. Stick to the following functions for best performance:

The fastest way to access the field data is by accessing the array $recordset->fields directly. Also set the global variables $ADODB_FETCH_MODE = ADODB_FETCH_NUM, and (for oci8, ibase/firebird and odbc) $ADODB_COUNTRECS = false before you connect to your database.

Consider using bind parameters if your database supports it, as it improves query plan reuse. Use ADOdb's performance tuning system to identify bottlenecks quickly. At the time of writing (Dec 2003), this means oci8 and odbc drivers.

Lastly make sure you have a PHP accelerator cache installed such as APC, Turck MMCache, Zend Accelerator or ionCube.

Some examples:

$rs =& $rs->Execute($sql);
while (!$rs->EOF) {
	var_dump($rs->fields);
	$rs->MoveNext();
}

$rs =& $rs->Execute($sql);
$array = adodb_getall($rs);
var_dump($array);

Advanced Tips

If you have the ADOdb C extension installed, you can replace your calls to $rs->MoveNext() with adodb_movenext($rs). This doubles the speed of this operation. For retrieving entire recordsets at once, use GetArray(), which uses the high speed extension function adodb_getall($rs) internally.

Execute() is the default way to run queries. You can use the low-level functions _Execute() and _query() to reduce query overhead. Both these functions share the same parameters as Execute().

If you do not have any bind parameters or your database supports binding (without emulation), then you can call _Execute() directly. Calling this function bypasses bind emulation. Debugging is still supported in _Execute().

If you do not require debugging facilities nor emulated binding, and do not require a recordset to be returned, then you can call _query. This is great for inserts, updates and deletes. Calling this function bypasses emulated binding, debugging, and recordset handling. Either the resultid, true or false are returned by _query().

For Informix, you can disable scrollable cursors with $db->cursorType = 0.

Hacking ADOdb Safely

You might want to modify ADOdb for your own purposes. Luckily you can still maintain backward compatibility by sub-classing ADOdb and using the $ADODB_NEWCONNECTION variable. $ADODB_NEWCONNECTION allows you to override the behaviour of ADONewConnection(). ADOConnection() checks for this variable and will call the function-name stored in this variable if it is defined.

In the following example, new functionality for the connection object is placed in the hack_mysql and hack_postgres7 classes. The recordset class naming convention can be controlled using $rsPrefix. Here we set it to 'hack_rs_', which will make ADOdb use hack_rs_mysql and hack_rs_postgres7 as the recordset classes.

class hack_mysql extends adodb_mysql {
var $rsPrefix = 'hack_rs_';
  /* Your mods here */
}

class hack_rs_mysql extends ADORecordSet_mysql {
	 /* Your mods here */
}

class hack_postgres7 extends adodb_postgres7 {
var $rsPrefix = 'hack_rs_';
  /* Your mods here */
}

class hack_rs_postgres7 extends ADORecordSet_postgres7 {
 /* Your mods here */
}

$ADODB_NEWCONNECTION = 'hack_factory';

function& hack_factory($driver)
{
	if ($driver !== 'mysql' && $driver !== 'postgres7') return false;
	
	$driver = 'hack_'.$driver;
	$obj = new $driver();
	return $obj;
}

include_once('adodb.inc.php');

Don't forget to call the constructor of the parent class in your constructor. If you want to use the default ADOdb drivers return false in the above hack_factory() function. Also you can define your own ADORecordSet_empty() class, by defining a class $$this->rsPrefix.'empty' since 4.96/5.02.

PHP5 Features

• PDO: PDO drivers are available. See the connection examples. Currently PDO drivers are not as powerful as native drivers, and should be treated as experimental.
  
  
• Foreach iterators: This is a very natural way of going through a recordset:

  	$ADODB_FETCH_MODE = ADODB_FETCH_NUM;
  	$rs = $db->Execute($sql);
  	foreach($rs as $k => $row) {
  		echo "r1=".$row[0]." r2=".$row[1]."<br>";
  	}
  

• Exceptions: Just include adodb-exceptions.inc.php and you can now catch exceptions on errors as they occur.

  	include("../adodb-exceptions.inc.php"); 
  	include("../adodb.inc.php");	 
  	try { 
  		$db = NewADOConnection("oci8"); 
  		$db->Connect('','scott','bad-password'); 
  	} catch (exception $e) { 
  		var_dump($e); 
  		adodb_backtrace($e->gettrace());
  	} 
  

  Note that reaching EOF is not considered an error nor an exception.

Databases Supported

The "Tested" column indicates how extensively the code has been tested and used.
A = well tested and used by many people
B = tested and usable, but some features might not be implemented
C = user contributed or experimental driver. Might not fully support all of the latest features of ADOdb.

The column "RecordCount() usable" indicates whether RecordCount() return the number of rows, or returns -1 when a SELECT statement is executed. If this column displays Y/N then the RecordCount() is emulated when the global variable $ADODB_COUNTRECS=true (this is the default). Note that for large recordsets, it might be better to disable RecordCount() emulation because substantial amounts of memory are required to cache the recordset for counting. Also there is a speed penalty of 40-50% if emulation is required. This is emulated in most databases except for PostgreSQL and MySQL. This variable is checked every time a query is executed, so you can selectively choose which recordsets to count.

Tutorials

Example 1: Select Statement

Task: Connect to the Access Northwind DSN, display the first 2 columns of each row.

In this example, we create a ADOConnection object, which represents the connection to the database. The connection is initiated with PConnect, which is a persistent connection. Whenever we want to query the database, we call the ADOConnection.Execute() function. This returns an ADORecordSet object which is actually a cursor that holds the current row in the array fields[]. We use MoveNext() to move from row to row.

NB: A useful function that is not used in this example is SelectLimit, which allows us to limit the number of rows shown.

<?
include('adodb.inc.php');	   # load code common to ADOdb
$conn = &ADONewConnection('access');	# create a connection
$conn->PConnect('northwind');   # connect to MS-Access, northwind DSN
$recordSet = &$conn->Execute('select * from products');
if (!$recordSet) 
	print $conn->ErrorMsg();
else
while (!$recordSet->EOF) {
	print $recordSet->fields[0].' '.$recordSet->fields[1].'<BR>';
	$recordSet->MoveNext();
}

$recordSet->Close(); # optional
$conn->Close(); # optional

?>

The $recordSet returned stores the current row in the $recordSet->fields array, indexed by column number (starting from zero). We use the MoveNext() function to move to the next row. The EOF property is set to true when end-of-file is reached. If an error occurs in Execute(), we return false instead of a recordset.

The $recordSet->fields[] array is generated by the PHP database extension. Some database extensions only index by number and do not index the array by field name. To force indexing by name - that is associative arrays - use the SetFetchMode function. Each recordset saves and uses whatever fetch mode was set when the recordset was created in Execute() or SelectLimit().

	$db->SetFetchMode(ADODB_FETCH_NUM);
	$rs1 = $db->Execute('select * from table');
	$db->SetFetchMode(ADODB_FETCH_ASSOC);
	$rs2 = $db->Execute('select * from table');
	print_r($rs1->fields); # shows array([0]=>'v0',[1] =>'v1')
	print_r($rs2->fields); # shows array(['col1']=>'v0',['col2'] =>'v1')

To get the number of rows in the select statement, you can use $recordSet->RecordCount(). Note that it can return -1 if the number of rows returned cannot be determined.

Example 2: Advanced Select with Field Objects

Select a table, display the first two columns. If the second column is a date or timestamp, reformat the date to US format.

<?
include('adodb.inc.php');	   # load code common to ADOdb
$conn = &ADONewConnection('access');	# create a connection
$conn->PConnect('northwind');   # connect to MS-Access, northwind dsn
$recordSet = &$conn->Execute('select CustomerID,OrderDate from Orders');
if (!$recordSet) 
	print $conn->ErrorMsg();
else
while (!$recordSet->EOF) {
	$fld = $recordSet->FetchField(1);
	$type = $recordSet->MetaType($fld->type);

	if ( $type == 'D' || $type == 'T') 
		print $recordSet->fields[0].' '.
			$recordSet->UserDate($recordSet->fields[1],'m/d/Y').'<BR>';
	else 
		print $recordSet->fields[0].' '.$recordSet->fields[1].'<BR>';

	$recordSet->MoveNext();
}
$recordSet->Close(); # optional
$conn->Close(); # optional

?>

In this example, we check the field type of the second column using FetchField(). This returns an object with at least 3 fields.

• name: name of column
• type: native field type of column
• max_length: maximum length of field. Some databases such as MySQL do not return the maximum length of the field correctly. In these cases max_length will be set to -1.

We then use MetaType() to translate the native type to a generic type. Currently the following generic types are defined:

• C: character fields that should be shown in a <input type="text"> tag.
• X: TeXt, large text fields that should be shown in a <textarea>
• B: Blobs, or Binary Large Objects. Typically images.
• D: Date field
• T: Timestamp field
• L: Logical field (boolean or bit-field)
• I:  Integer field
• N: Numeric field. Includes autoincrement, numeric, floating point, real and integer.
• R: Serial field. Includes serial, autoincrement integers. This works for selected databases.

If the metatype is of type date or timestamp, then we print it using the user defined date format with UserDate(), which converts the PHP SQL date string format to a user defined one. Another use for MetaType() is data validation before doing an SQL insert or update.

Example 3: Inserting

Insert a row to the Orders table containing dates and strings that need to be quoted before they can be accepted by the database, eg: the single-quote in the word John's.

<?
include('adodb.inc.php');	   # load code common to ADOdb
$conn = &ADONewConnection('access');	# create a connection

$conn->PConnect('northwind');   # connect to MS-Access, northwind dsn
$shipto = $conn->qstr("John's Old Shoppe");

$sql = "insert into orders (customerID,EmployeeID,OrderDate,ShipName) ";
$sql .= "values ('ANATR',2,".$conn->DBDate(time()).",$shipto)";

if ($conn->Execute($sql) === false) {
	print 'error inserting: '.$conn->ErrorMsg().'<BR>';
}
?>

In this example, we see the advanced date and quote handling facilities of ADOdb. The unix timestamp (which is a long integer) is appropriately formated for Access with DBDate(), and the right escape character is used for quoting the John's Old Shoppe, which is John''s Old Shoppe and not PHP's default John's Old Shoppe with qstr().

Observe the error-handling of the Execute statement. False is returned by Execute() if an error occured. The error message for the last error that occurred is displayed in ErrorMsg(). Note: php_track_errors might have to be enabled for error messages to be saved.

Example 4: Debugging

<?
include('adodb.inc.php');	   # load code common to ADOdb
$conn = &ADONewConnection('access');	# create a connection
$conn->PConnect('northwind');   # connect to MS-Access, northwind dsn
$shipto = $conn->qstr("John's Old Shoppe");
$sql = "insert into orders (customerID,EmployeeID,OrderDate,ShipName) ";
$sql .= "values ('ANATR',2,".$conn->FormatDate(time()).",$shipto)";
$conn->debug = true;
if ($conn->Execute($sql) === false) print 'error inserting';
?>

In the above example, we have turned on debugging by setting debug = true. This will display the SQL statement before execution, and also show any error messages. There is no need to call ErrorMsg() in this case. For displaying the recordset, see the rs2html() example.

Also see the section on Custom Error Handlers.

Example 5: MySQL and Menus

Connect to MySQL database agora, and generate a <select> menu from an SQL statement where the <option> captions are in the 1st column, and the value to send back to the server is in the 2nd column.

<?
include('adodb.inc.php'); # load code common to ADOdb
$conn = &ADONewConnection('mysql');  # create a connection
$conn->PConnect('localhost','userid','','agora');# connect to MySQL, agora db
$sql = 'select CustomerName, CustomerID from customers';
$rs = $conn->Execute($sql);
print $rs->GetMenu('GetCust','Mary Rosli');
?>

Here we define a menu named GetCust, with the menu option 'Mary Rosli' selected. See GetMenu(). We also have functions that return the recordset as an array: GetArray(), and as an associative array with the key being the first column: GetAssoc().

Example 6: Connecting to 2 Databases At Once

<?
include('adodb.inc.php');	 # load code common to ADOdb
$conn1 = &ADONewConnection('mysql');  # create a mysql connection
$conn2 = &ADONewConnection('oracle');  # create a oracle connection

$conn1->PConnect($server, $userid, $password, $database);
$conn2->PConnect(false, $ora_userid, $ora_pwd, $oraname);

$conn1->Execute('insert ...');
$conn2->Execute('update ...');
?>

Example 7: Generating Update and Insert SQL

Since ADOdb 4.56, we support AutoExecute(), which simplifies things by providing an advanced wrapper for GetInsertSQL() and GetUpdateSQL(). For example, an INSERT can be carried out with:

    $record["firstname"] = "Bob"; 
    $record["lastname"] = "Smith"; 
    $record["created"] = time(); 
    $insertSQL = $conn->AutoExecute($rs, $record, 'INSERT'); 

    $record["firstname"] = "Caroline"; 
    $record["lastname"] = "Smith"; # Update Caroline's lastname from Miranda to Smith 
    $insertSQL = $conn->AutoExecute($rs, $record, 'UPDATE', 'id = 1'); 

The rest of this section is out-of-date:

ADOdb 1.31 and later supports two new recordset functions: GetUpdateSQL( ) and GetInsertSQL( ). This allow you to perform a "SELECT * FROM table query WHERE...", make a copy of the $rs->fields, modify the fields, and then generate the SQL to update or insert into the table automatically.

We show how the functions can be used when accessing a table with the following fields: (ID, FirstName, LastName, Created).

Before these functions can be called, you need to initialize the recordset by performing a select on the table. Idea and code by Jonathan Younger jyounger#unilab.com. Since ADOdb 2.42, you can pass a table name instead of a recordset into GetInsertSQL (in $rs), and it will generate an insert statement for that table.

<?
#==============================================
# SAMPLE GetUpdateSQL() and GetInsertSQL() code
#==============================================
include('adodb.inc.php');
include('tohtml.inc.php');

#==========================
# This code tests an insert

$sql = "SELECT * FROM ADOXYZ WHERE id = -1"; 
# Select an empty record from the database

$conn = &ADONewConnection("mysql");  # create a connection
$conn->debug=1;
$conn->PConnect("localhost", "admin", "", "test"); # connect to MySQL, testdb
$rs = $conn->Execute($sql); # Execute the query and get the empty recordset

$record = array(); # Initialize an array to hold the record data to insert

# Set the values for the fields in the record
# Note that field names are case-insensitive
$record["firstname"] = "Bob";
$record["lastNamE"] = "Smith";
$record["creaTed"] = time();

# Pass the empty recordset and the array containing the data to insert
# into the GetInsertSQL function. The function will process the data and return
# a fully formatted insert sql statement.
$insertSQL = $conn->GetInsertSQL($rs, $record);

$conn->Execute($insertSQL); # Insert the record into the database

#==========================
# This code tests an update

$sql = "SELECT * FROM ADOXYZ WHERE id = 1"; 
# Select a record to update

$rs = $conn->Execute($sql); # Execute the query and get the existing record to update

$record = array(); # Initialize an array to hold the record data to update

# Set the values for the fields in the record
# Note that field names are case-insensitive
$record["firstname"] = "Caroline";
$record["LasTnAme"] = "Smith"; # Update Caroline's lastname from Miranda to Smith

# Pass the single record recordset and the array containing the data to update
# into the GetUpdateSQL function. The function will process the data and return
# a fully formatted update sql statement with the correct WHERE clause.
# If the data has not changed, no recordset is returned
$updateSQL = $conn->GetUpdateSQL($rs, $record);

$conn->Execute($updateSQL); # Update the record in the database
$conn->Close();
?>

The behaviour of AutoExecute(), GetUpdateSQL() and GetInsertSQL() when converting empty or null PHP variables to SQL is controlled by the global $ADODB_FORCE_TYPE variable. Set it to one of the values below. Default is ADODB_FORCE_VALUE (3):

0 = ignore empty fields. All empty fields in array are ignored.
1 = force null. All empty, php null and string 'null' fields are changed to sql NULL values.
2 = force empty. All empty, php null and string 'null' fields are changed to sql empty '' or 0 values.
3 = force value. Value is left as it is. Php null and string 'null' are set to sql NULL values and 
    empty fields '' are set to empty '' sql values.

define('ADODB_FORCE_IGNORE',0);
define('ADODB_FORCE_NULL',1);
define('ADODB_FORCE_EMPTY',2);
define('ADODB_FORCE_VALUE',3);

Thanks to Niko (nuko#mbnet.fi) for the $ADODB_FORCE_TYPE code.

Note: the constant ADODB_FORCE_NULLS is obsolete since 4.52 and is ignored. Set $ADODB_FORCE_TYPE = ADODB_FORCE_NULL for equivalent behaviour.

Since 4.62, the table name to be used can be overridden by setting $rs->tableName before AutoExecute(), GetInsertSQL() or GetUpdateSQL() is called.

Example 8: Implementing Scrolling with Next and Previous

The following code creates a very simple recordset pager, where you can scroll from page to page of a recordset.

include_once('../adodb.inc.php');
include_once('../adodb-pager.inc.php');
session_start();

$db = NewADOConnection('mysql');

$db->Connect('localhost','root','','xphplens');

$sql = "select * from adoxyz ";

$pager = new ADODB_Pager($db,$sql);
$pager->Render($rows_per_page=5);

This will create a basic record pager that looks like this:

|<   <<   >>   >|

ID First Name Last Name Date Created 36  Alan  Turing  Sat 06, Oct 2001  37  Serena  Williams  Sat 06, Oct 2001  38  Yat Sun  Sun  Sat 06, Oct 2001  39  Wai Hun  See  Sat 06, Oct 2001  40  Steven  Oey  Sat 06, Oct 2001

Page 8/10

The number of rows to display at one time is controled by the Render($rows) method. If you do not pass any value to Render(), ADODB_Pager will default to 10 records per page.

You can control the column titles by modifying your SQL (supported by most databases):

$sql = 'select id as "ID", firstname as "First Name", 
		  lastname as "Last Name", created as "Date Created" 
		from adoxyz';

The above code can be found in the adodb/tests/testpaging.php example included with this release, and the class ADODB_Pager in adodb/adodb-pager.inc.php. The ADODB_Pager code can be adapted by a programmer so that the text links can be replaced by images, and the dull white background be replaced with more interesting colors.

You can also allow display of html by setting $pager->htmlSpecialChars = false.

Some of the code used here was contributed by Iván Oliva and Cornel G.

Example 9: Exporting in CSV or Tab-Delimited Format

We provide some helper functions to export in comma-separated-value (CSV) and tab-delimited formats:

include_once('/path/to/adodb/toexport.inc.php');
include_once('/path/to/adodb/adodb.inc.php');

$db = &NewADOConnection('mysql');
$db->Connect($server, $userid, $password, $database);

$rs = $db->Execute('select fname as "First Name", surname as "Surname" from table');

print "<pre>";
print rs2csv($rs); # return a string, CSV format
print '<hr>';

$rs->MoveFirst(); # note, some databases do not support MoveFirst
print rs2tab($rs,false); # return a string, tab-delimited
						 # false == suppress field names in first line
print '<hr>';
$rs->MoveFirst();
rs2tabout($rs); # send to stdout directly (there is also an rs2csvout function)
print "</pre>";

$rs->MoveFirst();
$fp = fopen($path, "w");
if ($fp) {
  rs2csvfile($rs, $fp); # write to file (there is also an rs2tabfile function)
  fclose($fp);
}

Carriage-returns or newlines are converted to spaces. Field names are returned in the first line of text. Strings containing the delimiter character are quoted with double-quotes. Double-quotes are double-quoted again. This conforms to Excel import and export guide-lines.

All the above functions take as an optional last parameter, $addtitles which defaults to true. When set to false field names in the first line are suppressed.

Example 10: Recordset Filters

Sometimes we want to pre-process all rows in a recordset before we use it. For example, we want to ucwords all text in recordset.

include_once('adodb/rsfilter.inc.php');
include_once('adodb/adodb.inc.php');

// ucwords() every element in the recordset
function do_ucwords(&$arr,$rs)
{
	foreach($arr as $k => $v) {
		$arr[$k] = ucwords($v);
	}
}

$db = NewADOConnection('mysql');
$db->PConnect('server','user','pwd','db');

$rs = $db->Execute('select ... from table');
$rs = RSFilter($rs,'do_ucwords');

The RSFilter function takes 2 parameters, the recordset, and the name of the filter function. It returns the processed recordset scrolled to the first record. The filter function takes two parameters, the current row as an array, and the recordset object. For future compatibility, you should not use the original recordset object.

Example 11: Smart Transactions

$conn->BeginTrans();
$ok = $conn->Execute($sql);
if ($ok) $ok = $conn->Execute($sql2);
if (!$ok) $conn->RollbackTrans();
else $conn->CommitTrans();

$conn->StartTrans();
$conn->Execute($sql);
$conn->Execute($Sql2);
$conn->CompleteTrans();

$conn->StartTrans();
$conn->Execute($sql);
if (!CheckRecords()) $conn->FailTrans();
$conn->Execute($Sql2);
$conn->CompleteTrans();

You can also check if a transaction has failed, using HasFailedTrans(), which returns true if FailTrans() was called, or there was an error in the SQL execution. Make sure you call HasFailedTrans() before you call CompleteTrans(), as it is only works between StartTrans/CompleteTrans.

Lastly, StartTrans/CompleteTrans is nestable, and only the outermost block is executed. In contrast, BeginTrans/CommitTrans/RollbackTrans is NOT nestable.

$conn->StartTrans();
$conn->Execute($sql);
  $conn->StartTrans();    # ignored
  if (!CheckRecords()) $conn->FailTrans();
  $conn->CompleteTrans(); # ignored
$conn->Execute($Sql2);
$conn->CompleteTrans();

Note: Savepoints are currently not supported.

Using Custom Error Handlers and PEAR_Error

ADOdb supports PHP5 exceptions. Just include adodb-exceptions.inc.php and you can now catch exceptions on errors as they occur.

	include("../adodb-exceptions.inc.php"); 
	include("../adodb.inc.php");	 
	try { 
		$db = NewADOConnection("oci8://scott:bad-password@mytns/"); 
	} catch (exception $e) { 
		var_dump($e); 
		adodb_backtrace($e->gettrace());
	} 

ADOdb also provides two custom handlers which you can modify for your needs. The first one is in the adodb-errorhandler.inc.php file. This makes use of the standard PHP functions error_reporting to control what error messages types to display, and trigger_error which invokes the default PHP error handler.

Including the above file will cause trigger_error($errorstring,E_USER_ERROR) to be called when
(a) Connect() or PConnect() fails, or
(b) a function that executes SQL statements such as Execute() or SelectLimit() has an error.
(c) GenID() appears to go into an infinite loop.

The $errorstring is generated by ADOdb and will contain useful debugging information similar to the error.log data generated below. This file adodb-errorhandler.inc.php should be included before you create any ADOConnection objects.

If you define error_reporting(0), no errors will be passed to the error handler. If you set error_reporting(E_ALL), all errors will be passed to the error handler. You still need to use ini_set("display_errors", "0" or "1") to control the display of errors.

<?php
error_reporting(E_ALL); # pass any error messages triggered to error handler
include('adodb-errorhandler.inc.php');
include('adodb.inc.php');
include('tohtml.inc.php');
$c = NewADOConnection('mysql');
$c->PConnect('localhost','root','','northwind');
$rs=$c->Execute('select * from productsz'); #invalid table productsz');
if ($rs) rs2html($rs);
?>

If you want to log the error message, you can do so by defining the following optional constants ADODB_ERROR_LOG_TYPE and ADODB_ERROR_LOG_DEST. ADODB_ERROR_LOG_TYPE is the error log message type (see error_log in the PHP manual). In this case we set it to 3, which means log to the file defined by the constant ADODB_ERROR_LOG_DEST.

<?php
error_reporting(E_ALL); # report all errors
ini_set("display_errors", "0"); # but do not echo the errors
define('ADODB_ERROR_LOG_TYPE',3);
define('ADODB_ERROR_LOG_DEST','C:/errors.log');
include('adodb-errorhandler.inc.php');
include('adodb.inc.php');
include('tohtml.inc.php');

$c = NewADOConnection('mysql');
$c->PConnect('localhost','root','','northwind');
$rs=$c->Execute('select * from productsz'); ## invalid table productsz
if ($rs) rs2html($rs);
?>

(2001-10-28 14:20:38) mysql error: [1146: Table 'northwind.productsz' doesn't exist] in
 EXECUTE("select * from productsz")

PEAR_ERROR

<?php
include('adodb-errorpear.inc.php');
include('adodb.inc.php');
include('tohtml.inc.php');
$c = NewADOConnection('mysql');
$c->PConnect('localhost','root','','northwind');
$rs=$c->Execute('select * from productsz'); #invalid table productsz');
if ($rs) rs2html($rs);
else {
	$e = ADODB_Pear_Error();
	echo '<p>',$e->message,'</p>';
}
?>

You can use a PEAR_Error derived class by defining the constant ADODB_PEAR_ERROR_CLASS before the adodb-errorpear.inc.php file is included. For easy debugging, you can set the default error handler in the beginning of the PHP script to PEAR_ERROR_DIE, which will cause an error message to be printed, then halt script execution:

include('PEAR.php');
PEAR::setErrorHandling('PEAR_ERROR_DIE');

Note that we do not explicitly return a PEAR_Error object to you when an error occurs. We return false instead. You have to call ADODB_Pear_Error() to get the last error or use the PEAR_ERROR_DIE technique.

MetaError and MetaErrMsg

If you need error messages that work across multiple databases, then use MetaError(), which returns a virtualized error number, based on PEAR DB's error number system, and MetaErrMsg().

Error Messages

Error messages are outputted using the static method ADOConnnection::outp($msg,$newline=true). By default, it sends the messages to the client. You can override this to perform error-logging.

Data Source Names

We now support connecting using PEAR style DSN's. A DSN is a connection string of the form:

$dsn = "$driver://$username:$password@$hostname/$databasename";

An example:

   $username = 'root';
   $password = '';
   $hostname = 'localhost';
   $databasename = 'xphplens';
   $driver = 'mysql';
   $dsn = "$driver://$username:$password@$hostname/$databasename"
   $db = NewADOConnection(); 
   # DB::Connect($dsn) also works if you include 'adodb/adodb-pear.inc.php' at the top
   $rs = $db->query('select firstname,lastname from adoxyz');
   $cnt = 0;
   while ($arr = $rs->fetchRow()) {
		print_r($arr); print "<br>";
   }

More info and connection examples on the DSN format.

PEAR Compatibility

 DB_Common
 	query - returns PEAR_Error on error
	limitQuery - return PEAR_Error on error
	prepare - does not return PEAR_Error on error
	execute - does not return PEAR_Error on error
	setFetchMode - supports ASSOC and ORDERED
	errorNative
	quote
	nextID
	disconnect
	
	getOne
	getAssoc
	getRow
	getCol
	
 DB_Result
 	numRows - returns -1 if not supported
	numCols
	fetchInto - does not support passing of fetchmode
	fetchRows - does not support passing of fetchmode
	free

Caching of Recordsets

ADOdb now supports caching of recordsets in the file system using the CacheExecute( ), CachePageExecute( ) and CacheSelectLimit( ) functions. There are similar to the non-cache functions, except that they take a new first parameter, $secs2cache.

An example:

include('adodb.inc.php'); # load code common to ADOdb
$ADODB_CACHE_DIR = '/usr/ADODB_cache';
$conn = &ADONewConnection('mysql');  # create a connection
$conn->PConnect('localhost','userid','','agora');# connect to MySQL, agora db
$sql = 'select CustomerName, CustomerID from customers';
$rs = $conn->CacheExecute(15,$sql);

The first parameter is the number of seconds to cache the query. Subsequent calls to that query will used the cached version stored in $ADODB_CACHE_DIR. To force a query to execute and flush the cache, call CacheExecute() with the first parameter set to zero. Alternatively, use the CacheFlush($sql) call.

For the sake of security, we recommend you set register_globals=off in php.ini if you are using $ADODB_CACHE_DIR.

In ADOdb 1.80 onwards, the secs2cache parameter is optional in CacheSelectLimit() and CacheExecute(). If you leave it out, it will use the $connection->cacheSecs parameter, which defaults to 60 minutes. The following are equivalent:

  # (1)
  $rs = $db->SelectLimit(30, 'select * from table', 10);
  
  # (2)
  $db->cacheSsecs = 30;
  $rs = $db->SelectLimit('select * from table', 10);
  

	$conn->Connect(...);
	$conn->cacheSecs = 3600*24; # cache 24 hours
	$rs = $conn->CacheExecute('select * from table');

Please note that magic_quotes_runtime should be turned off. Do not change $ADODB_FETCH_MODE (or SetFetchMode) as the cached recordset will use the $ADODB_FETCH_MODE set when the query was executed.

MemCache support

$db = NewADOConnection($driver);
$db->memCache = true;
$db->memCacheHost = array($ip1, $ip2, $ip3); /// $db->memCacheHost = $ip1; will work too
$db->memCachePort = 11211; /// this is default memCache port
$db->memCacheCompress = false; /// Use 'true' to store the item compressed (uses zlib)

$db->Connect(...);
$db->CacheExecute($sql);

include "/path/to/adodb.inc.php";
$ADODB_CACHE_CLASS = 'MyCacheClass';

class MyCacheClass extends ADODB_Cache_File
{
	var $createdir = false; // do not set this to true unless you use temp directories in cache path
	function writecache($filename, $contents,$debug=false){...}
	function &readcache($filename, &$err, $secs2cache, $rsClass){ ...}
	 :
}

$DB = NewADOConnection($driver);
$DB->Connect(...);  ## MyCacheClass created here and stored in $ADODB_CACHE global variable.

$data = $rs->CacheGetOne($sql); ## MyCacheClass is used here for caching...

Since ADOdb 2.30, we support the generation of SQL to create pivot tables, also known as cross-tabulations. For further explanation read this DevShed Cross-Tabulation tutorial. We assume that your database supports the SQL case-when expression.

The following code will generate the SQL for a cross-tabulation:

# Query the main "product" table
# Set the rows to SupplierName
# and the columns to the values of Categories
# and define the joins to link to lookup tables 
# "categories" and "suppliers"
#
 include "adodb/pivottable.inc.php";
 $sql = PivotTableSQL(
 	$gDB,                                      # adodb connection
 	'products p ,categories c ,suppliers s',   # tables
	'SupplierName',                             # rows (multiple fields allowed)
	'CategoryName',                            # column to pivot on 
	'p.CategoryID = c.CategoryID and s.SupplierID= p.SupplierID' # joins/where
);

This will generate the following SQL:

SELECT SupplierName,
SUM(CASE WHEN CategoryName='Beverages' THEN 1 ELSE 0 END) AS "Beverages",
SUM(CASE WHEN CategoryName='Condiments' THEN 1 ELSE 0 END) AS "Condiments",
SUM(CASE WHEN CategoryName='Confections' THEN 1 ELSE 0 END) AS "Confections",
SUM(CASE WHEN CategoryName='Dairy Products' THEN 1 ELSE 0 END) AS "Dairy Products",
SUM(CASE WHEN CategoryName='Grains/Cereals' THEN 1 ELSE 0 END) AS "Grains/Cereals",
SUM(CASE WHEN CategoryName='Meat/Poultry' THEN 1 ELSE 0 END) AS "Meat/Poultry",
SUM(CASE WHEN CategoryName='Produce' THEN 1 ELSE 0 END) AS "Produce",
SUM(CASE WHEN CategoryName='Seafood' THEN 1 ELSE 0 END) AS "Seafood",
SUM(1) as Total
FROM products p ,categories c ,suppliers s WHERE p.CategoryID = c.CategoryID and s.SupplierID= p.SupplierID
GROUP BY SupplierName

You can also pivot on numerical columns and generate totals by using ranges. This code was revised in ADODB 2.41 and is not backward compatible. The second example shows this:

 $sql = PivotTableSQL(
 	$gDB,                                       # adodb connection
 	'products p ,categories c ,suppliers s',    # tables
	'SupplierName',                              # rows (multiple fields allowed)
   array(                                       # column ranges
	' 0 '      => 'UnitsInStock <= 0',
	"1 to 5"   => '0 < UnitsInStock and UnitsInStock <= 5',
	"6 to 10"  => '5 < UnitsInStock and UnitsInStock <= 10',
	"11 to 15" => '10 < UnitsInStock and UnitsInStock <= 15',
	"16+"      => '15 < UnitsInStock'
	),
	' p.CategoryID = c.CategoryID and s.SupplierID= p.SupplierID', # joins/where
	'UnitsInStock',                             # sum this field
	'Sum '                                      # sum label prefix
);

Which generates:

SELECT SupplierName,
SUM(CASE WHEN UnitsInStock <= 0 THEN UnitsInStock ELSE 0 END) AS "Sum 0 ",
SUM(CASE WHEN 0 < UnitsInStock and UnitsInStock <= 5 THEN UnitsInStock ELSE 0 END) AS "Sum 1 to 5",
SUM(CASE WHEN 5 < UnitsInStock and UnitsInStock <= 10 THEN UnitsInStock ELSE 0 END) AS "Sum 6 to 10",
SUM(CASE WHEN 10 < UnitsInStock and UnitsInStock <= 15 THEN UnitsInStock ELSE 0 END) AS "Sum 11 to 15",
SUM(CASE WHEN 15 < UnitsInStock THEN UnitsInStock ELSE 0 END) AS "Sum 16+",
SUM(UnitsInStock) AS "Sum UnitsInStock",
SUM(1) as Total,
FROM products p ,categories c ,suppliers s WHERE p.CategoryID = c.CategoryID and s.SupplierID= p.SupplierID
GROUP BY SupplierName

Global Variables

$ADODB_COUNTRECS

If the database driver API does not support counting the number of records returned in a SELECT statement, the function RecordCount() is emulated when the global variable $ADODB_COUNTRECS is set to true, which is the default. We emulate this by buffering the records, which can take up large amounts of memory for big recordsets. Set this variable to false for the best performance. This variable is checked every time a query is executed, so you can selectively choose which recordsets to count.

$ADODB_CACHE_DIR

chown -R apache /path/to/adodb/cache
chgrp -R apache /path/to/adodb/cache

$ADODB_ANSI_PADDING_OFF

Determines whether to right trim CHAR fields (and also VARCHAR for ibase/firebird). Set to true to trim. Default is false. Currently works for oci8po, ibase and firebird drivers. Added in ADOdb 4.01.

$ADODB_LANG

Determines the language used in MetaErrorMsg(). The default is 'en', for English. To find out what languages are supported, see the files in adodb/lang/adodb-$lang.inc.php, where $lang is the supported langauge.

$ADODB_FETCH_MODE

This is a global variable that determines how arrays are retrieved by recordsets. The recordset saves this value on creation (eg. in Execute( ) or SelectLimit( )), and any subsequent changes to $ADODB_FETCH_MODE have no affect on existing recordsets, only on recordsets created in the future.

The following constants are defined:

define('ADODB_FETCH_DEFAULT',0);
define('ADODB_FETCH_NUM',1);
define('ADODB_FETCH_ASSOC',2);
define('ADODB_FETCH_BOTH',3);

An example:

	$ADODB_FETCH_MODE = ADODB_FETCH_NUM;
	$rs1 = $db->Execute('select * from table');
	$ADODB_FETCH_MODE = ADODB_FETCH_ASSOC;
	$rs2 = $db->Execute('select * from table');
	print_r($rs1->fields); # shows array([0]=>'v0',[1] =>'v1')
	print_r($rs2->fields); # shows array(['col1']=>'v0',['col2'] =>'v1')

As you can see in the above example, both recordsets store and use different fetch modes based on the $ADODB_FETCH_MODE setting when the recordset was created by Execute().

If no fetch mode is predefined, the fetch mode defaults to ADODB_FETCH_DEFAULT. The behaviour of this default mode varies from driver to driver, so do not rely on ADODB_FETCH_DEFAULT. For portability, we recommend sticking to ADODB_FETCH_NUM or ADODB_FETCH_ASSOC. Many drivers do not support ADODB_FETCH_BOTH.

SetFetchMode Function

If you have multiple connection objects, and want to have different fetch modes for each connection, then use SetFetchMode. Once this function is called for a connection object, that connection object will ignore the global variable $ADODB_FETCH_MODE and will use the internal fetchMode property exclusively.

	$db->SetFetchMode(ADODB_FETCH_NUM);
	$rs1 = $db->Execute('select * from table');
	$db->SetFetchMode(ADODB_FETCH_ASSOC);
	$rs2 = $db->Execute('select * from table');
	print_r($rs1->fields); # shows array([0]=>'v0',[1] =>'v1')
	print_r($rs2->fields); # shows array(['col1']=>'v0',['col2'] =>'v1')

To retrieve the previous fetch mode, you can use check the $db->fetchMode property, or use the return value of SetFetchMode( ).

ADODB_ASSOC_CASE

You can control the associative fetch case for certain drivers which behave differently. For the sybase, oci8po, mssql, odbc and ibase drivers and all drivers derived from them, ADODB_ASSOC_CASE will by default generate recordsets where the field name keys are lower-cased. Use the constant ADODB_ASSOC_CASE to change the case of the keys. There are 3 possible values:

0 = assoc lowercase field names. $rs->fields['orderid']
1 = assoc uppercase field names. $rs->fields['ORDERID']
2 = use native-case field names. $rs->fields['OrderID'] -- this is the default since ADOdb 2.90

To use it, declare it before you incldue adodb.inc.php.

define('ADODB_ASSOC_CASE', 2); # use native-case for ADODB_FETCH_ASSOC
include('adodb.inc.php');

$ADODB_FORCE_TYPE

See the GetUpdateSQL tutorial.

$ADODB_QUOTE_FIELDNAMES

Auto-quotes field names when using AutoExecute() when set to true.

ADOConnection

Object that performs the connection to the database, executes SQL statements and has a set of utility functions for standardising the format of SQL statements for issues such as concatenation and date formats.

ADOConnection Fields

databaseType: Name of the database system we are connecting to. Eg. odbc or mssql or mysql.

dataProvider: The underlying mechanism used to connect to the database. Normally set to native, unless using odbc or ado.

host: Name of server or data source name (DSN) to connect to.

database: Name of the database or to connect to. If ado is used, it will hold the ado data provider.

user: Login id to connect to database. Password is not saved for security reasons.

raiseErrorFn: Allows you to define an error handling function. See adodb-errorhandler.inc.php for an example.

debug: Set to true to make debug statements to appear.

concat_operator: Set to '+' or '||' normally. The operator used to concatenate strings in SQL. Used by the Concat function.

fmtDate: The format used by the DBDate function to send dates to the database. is '#Y-m-d#' for Microsoft Access, and ''Y-m-d'' for MySQL.

fmtTimeStamp: The format used by the DBTimeStamp function to send timestamps to the database.

true: The value used to represent true.Eg. '.T.'. for Foxpro, '1' for Microsoft SQL.

false: The value used to represent false. Eg. '.F.'. for Foxpro, '0' for Microsoft SQL.

replaceQuote: The string used to escape quotes. Eg. double single-quotes for Microsoft SQL, and backslash-quote for MySQL. Used by qstr.

autoCommit: indicates whether automatic commit is enabled. Default is true.

charSet: set the default charset to use. Currently only interbase/firebird supports this.

dialect: set the default sql dialect to use. Currently only interbase/firebird supports this.

role: set the role. Currently only interbase/firebird supports this.

metaTablesSQL: SQL statement to return a list of available tables. Eg. SHOW TABLES in MySQL.

genID: The latest id generated by GenID() if supported by the database.

cacheSecs: The number of seconds to cache recordsets if CacheExecute() or CacheSelectLimit() omit the $secs2cache parameter. Defaults to 60 minutes.

sysDate: String that holds the name of the database function to call to get the current date. Useful for inserts and updates.

sysTimeStamp: String that holds the name of the database function to call to get the current timestamp/datetime value.

leftOuter: String that holds operator for left outer join, if known. Otherwise set to false.

rightOuter: String that holds operator for left outer join, if known. Otherwise set to false.

ansiOuter: Boolean that if true indicates that ANSI style outer joins are permitted. Eg. select * from table1 left join table2 on p1=p2.

connectSID: Boolean that indicates whether to treat the $database parameter in connects as the SID for the oci8 driver. Defaults to false. Useful for Oracle 8.0.5 and earlier.

autoRollback: Persistent connections are auto-rollbacked in PConnect( ) if this is set to true. Default is false.

ADOConnection Main Functions

ADOConnection( )

Constructor function. Do not call this directly. Use ADONewConnection( ) instead.

Connect($host,[$user],[$password],[$database])

Non-persistent connect to data source or server $host, using userid $user and password $password. If the server supports multiple databases, connect to database $database.

Returns true/false depending on connection success. Since 4.23, null is returned if the extension is not loaded.

ADO Note: If you are using a Microsoft ADO and not OLEDB, you can set the $database parameter to the OLEDB data provider you are using.

PostgreSQL: An alternative way of connecting to the database is to pass the standard PostgreSQL connection string in the first parameter $host, and the other parameters will be ignored.

For Oracle and Oci8, there are two ways to connect. First is to use the TNS name defined in your local tnsnames.ora (or ONAMES or HOSTNAMES). Place the name in the $database field, and set the $host field to false. Alternatively, set $host to the server, and $database to the database SID, this bypassed tnsnames.ora.

Examples:

 # $oraname in tnsnames.ora/ONAMES/HOSTNAMES
 $conn->Connect(false, 'scott', 'tiger', $oraname); 
 $conn->Connect('server:1521', 'scott', 'tiger', 'ServiceName'); # bypass tnsnames.ora

There are many examples of connecting to a database. See Connection Examples for many examples.

PConnect($host,[$user],[$password],[$database])

Persistent connect to data source or server $host, using userid $user and password $password. If the server supports multiple databases, connect to database $database.

We now perform a rollback on persistent connection for selected databases since 2.21, as advised in the PHP manual. See change log or source code for which databases are affected.

Returns true/false depending on connection. Since 4.23, 0 is returned if the extension is not loaded. See Connect( ) above for more info.

Since ADOdb 2.21, we also support autoRollback. If you set:

 $conn = &NewADOConnection('mysql');
 $conn->autoRollback = true; # default is false
 $conn->PConnect(...); # rollback here

Then when doing a persistent connection with PConnect( ), ADOdb will perform a rollback first. This is because it is documented that PHP is not guaranteed to rollback existing failed transactions when persistent connections are used. This is implemented in Oracle, MySQL, PgSQL, MSSQL, ODBC currently.

Since ADOdb 3.11, you can force non-persistent connections even if PConnect is called by defining the constant ADODB_NEVER_PERSIST before you call PConnect.

Since 4.23, null is returned if the extension is not loaded.

NConnect($host,[$user],[$password],[$database])

Always force a new connection. In contrast, PHP sometimes reuses connections when you use Connect() or PConnect(). Currently works only on mysql (PHP 4.3.0 or later), postgresql and oci8-derived drivers. For other drivers, NConnect() works like Connect().

IsConnected( )

Returns true if connected to database. Added in 4.53.

Execute($sql,$inputarr=false)

Execute SQL statement $sql and return derived class of ADORecordSet if successful. Note that a record set is always returned on success, even if we are executing an insert or update statement. You can also pass in $sql a statement prepared in Prepare().

Returns derived class of ADORecordSet. Eg. if connecting via mysql, then ADORecordSet_mysql would be returned. False is returned if there was an error in executing the sql.

The $inputarr parameter can be used for binding variables to parameters. Below is an Oracle example:

 $conn->Execute("SELECT * FROM TABLE WHERE COND=:val", array('val'=> $val));
 

Another example, using ODBC,which uses the ? convention:

  $conn->Execute("SELECT * FROM TABLE WHERE COND=?", array($val));

Variable binding speeds the compilation and caching of SQL statements, leading to higher performance. Currently Oracle, Interbase and ODBC supports variable binding. Interbase/ODBC style ? binding is emulated in databases that do not support binding. Note that you do not have to quote strings if you use binding.

Variable binding in the odbc, interbase and oci8po drivers.

$rs = $db->Execute('select * from table where val=?', array('10'));

$rs = $db->Execute('select name from table where val=:key', 
  array('key' => 10));

Since ADOdb 3.80, we support bulk binding in Execute(), in which you pass in a 2-dimensional array to be bound to an INSERT/UPDATE or DELETE statement.

$arr = array(
	array('Ahmad',32),
	array('Zulkifli', 24),
	array('Rosnah', 21)
	);
$ok = $db->Execute('insert into table (name,age) values (?,?)',$arr);

This provides very high performance as the SQL statement is prepared first. The prepared statement is executed repeatedly for each array row until all rows are completed, or until the first error. Very useful for importing data.

CacheExecute([$secs2cache,]$sql,$inputarr=false)

Similar to Execute, except that the recordset is cached for $secs2cache seconds in the $ADODB_CACHE_DIR directory, and $inputarr only accepts 1-dimensional arrays. If CacheExecute() is called again with the same $sql, $inputarr, and also the same database, same userid, and the cached recordset has not expired, the cached recordset is returned.

  include('adodb.inc.php'); 
  include('tohtml.inc.php');
  $ADODB_CACHE_DIR = '/usr/local/ADOdbcache';
  $conn = &ADONewConnection('mysql'); 
  $conn->PConnect('localhost','userid','password','database');
  $rs = $conn->CacheExecute(15, 'select * from table'); # cache 15 secs
  rs2html($rs); /* recordset to html table */  

Alternatively, since ADOdb 1.80, the $secs2cache parameter is optional:

	$conn->Connect(...);
   	$conn->cacheSecs = 3600*24; // cache 24 hours
	$rs = $conn->CacheExecute('select * from table');

Performance note: I have done some benchmarks and found that they vary so greatly that it's better to talk about when caching is of benefit. When your database server is much slower than your Web server or the database is very overloaded then ADOdb's caching is good because it reduces the load on your database server. If your database server is lightly loaded or much faster than your Web server, then caching could actually reduce performance.

ExecuteCursor($sql,$cursorName='rs',$parameters=false)

Execute an Oracle stored procedure, and returns an Oracle REF cursor variable as a regular ADOdb recordset. Does not work with any other database except oci8. Thanks to Robert Tuttle for the design.

    $db = ADONewConnection("oci8"); 
    $db->Connect("foo.com:1521", "uid", "pwd", "FOO"); 
    $rs = $db->ExecuteCursor("begin :cursorvar := getdata(:param1); end;", 
					'cursorvar',
					array('param1'=>10)); 
    # $rs is now just like any other ADOdb recordset object
    rs2html($rs);

ExecuteCursor() is a helper function that does the following internally:

	$stmt = $db->Prepare("begin :cursorvar := getdata(:param1); end;", true); 
	$db->Parameter($stmt, $cur, 'cursorvar', false, -1, OCI_B_CURSOR);
	$rs = $db->Execute($stmt,$bindarr);

ExecuteCursor only accepts 1 out parameter. So if you have 2 out parameters, use:

	$vv = 'A%';
	$stmt = $db->PrepareSP("BEGIN list_tabs(:crsr,:tt); END;");
	$db->OutParameter($stmt, $cur, 'crsr', -1, OCI_B_CURSOR);
	$db->OutParameter($stmt, $vv, 'tt', 32); # return varchar(32)
	$arr = $db->GetArray($stmt);
	print_r($arr);
	echo " val = $vv"; ## outputs 'TEST'

	TYPE TabType IS REF CURSOR RETURN TAB%ROWTYPE;

	PROCEDURE list_tabs(tabcursor IN OUT TabType,tablenames IN OUT VARCHAR) IS
	BEGIN
		OPEN tabcursor FOR SELECT * FROM TAB WHERE tname LIKE tablenames;
		tablenames := 'TEST';
	END list_tabs;

SelectLimit($sql,$numrows=-1,$offset=-1,$inputarr=false)

Returns a recordset if successful. Returns false otherwise. Performs a select statement, simulating PostgreSQL's SELECT statement, LIMIT $numrows OFFSET $offset clause.

In PostgreSQL, SELECT * FROM TABLE LIMIT 3 will return the first 3 records only. The equivalent is $connection->SelectLimit('SELECT * FROM TABLE',3). This functionality is simulated for databases that do not possess this feature.

And SELECT * FROM TABLE LIMIT 3 OFFSET 2 will return records 3, 4 and 5 (eg. after record 2, return 3 rows). The equivalent in ADOdb is $connection->SelectLimit('SELECT * FROM TABLE',3,2).

Note that this is the opposite of MySQL's LIMIT clause. You can also set $connection->SelectLimit('SELECT * FROM TABLE',-1,10) to get rows 11 to the last row.

The last parameter $inputarr is for databases that support variable binding such as Oracle oci8. This substantially reduces SQL compilation overhead. Below is an Oracle example:

 $conn->SelectLimit("SELECT * FROM TABLE WHERE COND=:val", 100,-1,array('val'=> $val));
 

The oci8po driver (oracle portable driver) uses the more standard bind variable of ?:

 $conn->SelectLimit("SELECT * FROM TABLE WHERE COND=?", 100,-1,array('val'=> $val));

Ron Wilson reports that SelectLimit does not work with UNIONs.

CacheSelectLimit([$secs2cache,] $sql, $numrows=-1,$offset=-1,$inputarr=false)

Similar to SelectLimit, except that the recordset returned is cached for $secs2cache seconds in the $ADODB_CACHE_DIR directory.

Since 1.80, $secs2cache has been optional, and you can define the caching time in $connection->cacheSecs.

	$conn->Connect(...);
   $conn->cacheSecs = 3600*24; // cache 24 hours
	$rs = $conn->CacheSelectLimit('select * from table',10);

CacheFlush($sql=false,$inputarr=false)

Flush (delete) any cached recordsets for the SQL statement $sql in $ADODB_CACHE_DIR.

If no parameter is passed in, then all adodb_*.cache files are deleted.

CacheSelectLimit() rewrites the SQL query, so you won't be able to pass the SQL to CacheFlush. In this case, to flush the cached SQL recordset returned by CacheSelectLimit(), set $secs2cache to -1:

	$db->CacheSelectLimit(-1, $sql, $nrows);

If you want to flush all cached recordsets manually, execute the following PHP code (works only under Unix):
  system("rm -f `find ".$ADODB_CACHE_DIR." -name adodb_*.cache`");

For general cleanup of all expired files, you should use crontab on Unix, or at.exe on Windows, and a shell script similar to the following:
#------------------------------------------------------
# This particular example deletes files in the TMPPATH
# directory with the string ".cache" in their name that
# are more than 7 days old.
#------------------------------------------------------
AGED=7
find ${TMPPATH} -mtime +$AGED | grep "\.cache" | xargs rm -f

MetaError($errno=false)

Returns a virtualized error number, based on PEAR DB's error number system. You might need to include adodb-error.inc.php before you call this function. The parameter $errno is the native error number you want to convert. If you do not pass any parameter, MetaError will call ErrorNo() for you and convert it. If the error number cannot be virtualized, MetaError will return -1 (DB_ERROR).

MetaErrorMsg($errno)

Pass the error number returned by MetaError() for the equivalent textual error message.

ErrorMsg()

Returns the last status or error message. The error message is reset after every call to Execute().

This can return a string even if no error occurs. In general you do not need to call this function unless an ADOdb function returns false on an error.

Note: If debug is enabled, the SQL error message is always displayed when the Execute function is called.

ErrorNo()

Returns the last error number. The error number is reset after every call to Execute(). If 0 is returned, no error occurred.

Note that old versions of PHP (pre 4.0.6) do not support error number for ODBC. In general you do not need to call this function unless an ADOdb function returns false on an error.

IgnoreErrors($saveErrHandlers)

Allows you to ignore errors so that StartTrans()/CompleteTrans() is not affected, nor is the default error handler called if an error occurs. Useful when you want to check if a field or table exists in a database without invoking an error if it does not exist.

Usage:

$saveErrHandlers = $conn->IgnoreErrors();
$rs = $conn->Execute("select field from some_table_that_might_not_exist");
$conn->IgnoreErrors($saveErrHandlers);

Warning: do not call StartTrans()/CompleteTrans() inside a code block that is using IgnoreErrors().

SetFetchMode($mode)

Sets the current fetch mode for the connection and stores it in $db->fetchMode. Legal modes are ADODB_FETCH_ASSOC and ADODB_FETCH_NUM. For more info, see $ADODB_FETCH_MODE.

Returns the previous fetch mode, which could be false if SetFetchMode( ) has not been called before.

CreateSequence($seqName = 'adodbseq',$startID=1)

Create a sequence. The next time GenID( ) is called, the value returned will be $startID. Added in 2.60.

DropSequence($seqName = 'adodbseq')

Delete a sequence. Added in 2.60.

GenID($seqName = 'adodbseq',$startID=1)

Generate a sequence number . Works for interbase, mysql, postgresql, oci8, oci8po, mssql, ODBC based (access,vfp,db2,etc) drivers currently. Uses $seqName as the name of the sequence. GenID() will automatically create the sequence for you if it does not exist (provided the userid has permission to do so). Otherwise you will have to create the sequence yourself.

If your database driver emulates sequences, the name of the table is the sequence name. The table has one column, "id" which should be of type integer, or if you need something larger - numeric(16).

For ODBC and databases that do not support sequences natively (eg mssql, mysql), we create a table for each sequence. If the sequence has not been defined earlier, it is created with the starting value set in $startID.

Note that the mssql driver's GenID() before 1.90 used to generate 16 byte GUID's.

UpdateBlob($table,$column,$val,$where)

Usage:

	# for oracle
	$conn->Execute('INSERT INTO blobtable (id, blobcol) VALUES (1, empty_blob())');
	$conn->UpdateBlob('blobtable','blobcol',$blobvalue,'id=1');
	
	# non oracle databases
	$conn->Execute('INSERT INTO blobtable (id, blobcol) VALUES (1, null)');
	$conn->UpdateBlob('blobtable','blobcol',$blobvalue,'id=1');

Returns true if succesful, false otherwise. Supported by MySQL, PostgreSQL, Oci8, Oci8po and Interbase drivers. Other drivers might work, depending on the state of development.

Note that when an Interbase blob is retrieved using SELECT, it still needs to be decoded using $connection->DecodeBlob($blob); to derive the original value in versions of PHP before 4.1.0.

For PostgreSQL, you can store your blob using blob oid's or as a bytea field. You can use bytea fields but not blob oid's currently with UpdateBlob( ). Conversely UpdateBlobFile( ) supports oid's, but not bytea data.

If you do not pass in an oid, then UpdateBlob() assumes that you are storing in bytea fields.

If you do not have any blob fields, you can improve you can improve general SQL query performance by disabling blob handling with $connection->disableBlobs = true.

UpdateClob($table,$column,$val,$where)

Usage:

	# for oracle
	$conn->Execute('INSERT INTO clobtable (id, clobcol) VALUES (1, empty_clob())');
	$conn->UpdateBlob('clobtable','clobcol',$clobvalue,'id=1');
	
	# non oracle databases
	$conn->Execute('INSERT INTO clobtable (id, clobcol) VALUES (1, null)');
	$conn->UpdateBlob('clobtable','clobcol',$clobvalue,'id=1');

UpdateBlobFile($table,$column,$path,$where,$blobtype='BLOB')

Similar to UpdateBlob, except that we pass in a file path to where the blob resides.

For PostgreSQL, if you are using blob oid's, use this interface. This interface does not support bytea fields.

Returns true if successful, false otherwise.

BlobEncode($blob)

Some databases require blob's to be encoded manually before upload. Note if you use UpdateBlob( ) or UpdateBlobFile( ) the conversion is done automatically for you and you do not have to call this function. For PostgreSQL, currently, BlobEncode() can only be used for bytea fields.

Returns the encoded blob value.

Note that there is a connection property called blobEncodeType which has 3 legal values:

false - no need to perform encoding or decoding.
'I' - blob encoding required, and returned encoded blob is a numeric value (no need to quote).
'C' - blob encoding required, and returned encoded blob is a character value (requires quoting).

This is purely for documentation purposes, so that programs that accept multiple database drivers know what is the right thing to do when processing blobs.

BlobDecode($blob, $maxblobsize = false)

Some databases require blob's to be decoded manually after doing a select statement. If the database does not require decoding, then this function will return the blob unchanged. Currently BlobDecode is only required for one database, PostgreSQL, and only if you are using blob oid's (if you are using bytea fields, we auto-decode for you). The default maxblobsize is set in $connection->maxblobsize, which is set to 256K in adodb 4.54.

In ADOdb 4.54 and later, the blob is the return value. In earlier versions, the blob data is sent to stdout.

$rs = $db->Execute("select bloboid from postgres_table where id=$key");
$blob = $db->BlobDecode( reset($rs->fields) );

Replace($table, $arrFields, $keyCols,$autoQuote=false)

Try to update a record, and if the record is not found, an insert statement is generated and executed. Returns 0 on failure, 1 if update statement worked, 2 if no record was found and the insert was executed successfully. This differs from MySQL's replace which deletes the record and inserts a new record. This also means you cannot update the primary key. The only exception to this is Interbase and its derivitives, which uses delete and insert because of some Interbase API limitations.

The parameters are $table which is the table name, the $arrFields which is an associative array where the keys are the field names, and $keyCols is the name of the primary key, or an array of field names if it is a compound key. If $autoQuote is set to true, then Replace() will quote all values that are non-numeric; auto-quoting will not quote nulls. Note that auto-quoting will not work if you use SQL functions or operators.

Examples:

# single field primary key
$ret = $db->Replace('atable', 
	array('id'=>1000,'firstname'=>'Harun','lastname'=>'Al-Rashid'),
	'id',$autoquote = true);	
# generates UPDATE atable SET firstname='Harun',lastname='Al-Rashid' WHERE id=1000
# or INSERT INTO atable (id,firstname,lastname) VALUES (1000,'Harun','Al-Rashid')

# compound key
$ret = $db->Replace('atable2', 
	array('firstname'=>'Harun','lastname'=>'Al-Rashid', 'age' => 33, 'birthday' => 'null'),
	array('lastname','firstname'),
	$autoquote = true);

# no auto-quoting
$ret = $db->Replace('atable2', 
	array('firstname'=>"'Harun'",'lastname'=>"'Al-Rashid'", 'age' => 'null'),
	array('lastname','firstname'));	

AutoExecute($table, $arrFields, $mode, $where=false, $forceUpdate=true,$magicq=false)

Since ADOdb 4.56, you can automatically generate and execute INSERTs and UPDATEs on a given table with this function, which is a wrapper for GetInsertSQL() and GetUpdateSQL().

AutoExecute() inserts or updates $table given an array of $arrFields, where the keys are the field names and the array values are the field values to store. Note that there is some overhead because the table is first queried to extract key information before the SQL is generated. We generate an INSERT or UPDATE based on $mode (see below).

Legal values for $mode are

• 'INSERT' or 1 or DB_AUTOQUERY_INSERT
• 'UPDATE' or 2 or DB_AUTOQUERY_UPDATE

You have to define the constants DB_AUTOQUERY_UPDATE and DB_AUTOQUERY_INSERT yourself or include adodb-pear.inc.php.

The $where clause is required if $mode == 'UPDATE'. If $forceUpdate=false then we will query the database first and check if the field value returned by the query matches the current field value; only if they differ do we update that field.

Returns true on success, false on error.

An example of its use is:

$record["firstName"] = "Carol";
$record["lasTname"] = "Smith"; 
$conn->AutoExecute($table,$record,'INSERT');
# executes "INSERT INTO $table (firstName,lasTname) values ('Carol',Smith')";

$record["firstName"] = "Carol";
$record["lasTname"] = "Jones"; 
$conn->AutoExecute($table,$record,'UPDATE', "lastname like 'Sm%'");
# executes "UPDATE $table SET firstName='Carol',lasTname='Jones' WHERE lastname like 'Sm%'";

Note: One of the strengths of ADOdb's AutoExecute() is that only valid field names for $table are updated. If $arrFields contains keys that are invalid field names for $table, they are ignored. There is some overhead in doing this as we have to query the database to get the field names, but given that you are not directly coding the SQL yourself, you probably aren't interested in speed at all, but convenience.

Since 4.62, the table name to be used can be overridden by setting $rs->tableName before AutoExecute(), GetInsertSQL() or GetUpdateSQL() is called.

Since 4.94, setting the global variable $ADODB_QUOTE_FIELDNAMES to true will force field names to be auto-quoted in AutoExecute(), GetInsertSQL() and GetUpdateSQL().

GetUpdateSQL(&$rs, $arrFields, $forceUpdate=false,$magicq=false, $force=null)

Generate SQL to update a table given a recordset $rs, and the modified fields of the array $arrFields (which must be an associative array holding the column names and the new values) are compared with the current recordset. If $forceUpdate is true, then we also generate the SQL even if $arrFields is identical to $rs->fields. Requires the recordset to be associative. $magicq is used to indicate whether magic quotes are enabled (see qstr()). The field names in the array are case-insensitive.

Since 4.52, we allow you to pass the $force type parameter, and this overrides the $ADODB_FORCE_TYPE global variable.

Since 4.62, the table name to be used can be overridden by setting $rs->tableName before AutoExecute(), GetInsertSQL() or GetUpdateSQL() is called.

GetInsertSQL(&$rs, $arrFields,$magicq=false,$force_type=false)

Generate SQL to insert into a table given a recordset $rs. Requires the query to be associative. $magicq is used to indicate whether magic quotes are enabled (for qstr()). The field names in the array are case-insensitive.

Since 2.42, you can pass a table name instead of a recordset into GetInsertSQL (in $rs), and it will generate an insert statement for that table.

Since 4.52, we allow you to pass the $force_type parameter, and this overrides the $ADODB_FORCE_TYPE global variable.

Since 4.62, the table name to be used can be overridden by setting $rs->tableName before AutoExecute(), GetInsertSQL() or GetUpdateSQL() is called.

PageExecute($sql, $nrows, $page, $inputarr=false)

Used for pagination of recordset. $page is 1-based. See Example 8.

CachePageExecute($secs2cache, $sql, $nrows, $page, $inputarr=false)

Used for pagination of recordset. $page is 1-based. See Example 8. Caching version of PageExecute.

Close( )

Close the database connection. PHP4 proudly states that we no longer have to clean up at the end of the connection because the reference counting mechanism of PHP4 will automatically clean up for us.

StartTrans( )

Start a monitored transaction. As SQL statements are executed, ADOdb will monitor for SQL errors, and if any are detected, when CompleteTrans() is called, we auto-rollback.

To understand why StartTrans() is superior to BeginTrans(), let us examine a few ways of using BeginTrans(). The following is the wrong way to use transactions:

$DB->BeginTrans();
$DB->Execute("update table1 set val=$val1 where id=$id");
$DB->Execute("update table2 set val=$val2 where id=$id");
$DB->CommitTrans();

because you perform no error checking. It is possible to update table1 and for the update on table2 to fail. Here is a better way:

$DB->BeginTrans();
$ok = $DB->Execute("update table1 set val=$val1 where id=$id");
if ($ok) $ok = $DB->Execute("update table2 set val=$val2 where id=$id");
if ($ok) $DB->CommitTrans();
else $DB->RollbackTrans();

Another way is (since ADOdb 2.0):

$DB->BeginTrans();
$ok = $DB->Execute("update table1 set val=$val1 where id=$id");
if ($ok) $ok = $DB->Execute("update table2 set val=$val2 where id=$id");
$DB->CommitTrans($ok);

Now it is a headache monitoring $ok all over the place. StartTrans() is an improvement because it monitors all SQL errors for you. This is particularly useful if you are calling black-box functions in which SQL queries might be executed. Also all BeginTrans, CommitTrans and RollbackTrans calls inside a StartTrans block will be disabled, so even if the black box function does a commit, it will be ignored.

$DB->StartTrans();
CallBlackBox();
$DB->Execute("update table1 set val=$val1 where id=$id");
$DB->Execute("update table2 set val=$val2 where id=$id");
$DB->CompleteTrans();

Note that a StartTrans blocks are nestable, the inner blocks are ignored.

CompleteTrans($autoComplete=true)

Complete a transaction called with StartTrans(). This function monitors for SQL errors, and will commit if no errors have occured, otherwise it will rollback. Returns true on commit, false on rollback. If the parameter $autoComplete is true monitor sql errors and commit and rollback as appropriate. Set $autoComplete to false to force rollback even if no SQL error detected.

FailTrans( )

Fail a transaction started with StartTrans(). The rollback will only occur when CompleteTrans() is called.

HasFailedTrans( )

Check whether smart transaction has failed, eg. returns true if there was an error in SQL execution or FailTrans() was called. If not within smart transaction, returns false.

BeginTrans( )

Begin a transaction. Turns off autoCommit. Returns true if successful. Some databases will always return false if transaction support is not available. Any open transactions will be rolled back when the connection is closed. Among the databases that support transactions are Oracle, PostgreSQL, Interbase, MSSQL, certain versions of MySQL, DB2, Informix, Sybase, etc.

Note that StartTrans() and CompleteTrans() is a superior method of handling transactions, available since ADOdb 3.40. For a explanation, see the StartTrans() documentation.

You can also use the ADOdb error handler to die and rollback your transactions for you transparently. Some buggy database extensions are known to commit all outstanding tranasactions, so you might want to explicitly do a $DB->RollbackTrans() in your error handler for safety.

Detecting Transactions

Since ADOdb 2.50, you are able to detect when you are inside a transaction. Check that $connection->transCnt > 0. This variable is incremented whenever BeginTrans() is called, and decremented whenever RollbackTrans() or CommitTrans() is called.

CommitTrans($ok=true)

End a transaction successfully. Returns true if successful. If the database does not support transactions, will return true also as data is always committed.

If you pass the parameter $ok=false, the data is rolled back. See example in BeginTrans().

RollbackTrans( )

End a transaction, rollback all changes. Returns true if successful. If the database does not support transactions, will return false as data is never rollbacked.

SetTransactionMode($mode )

SetTransactionMode allows you to pass in the transaction mode to use for all subsequent transactions. Note: if you have persistent connections and using mssql or mysql, you might have to explicitly reset your transaction mode at the beginning of each page request. This is only supported in postgresql, mssql, mysql with InnoDB and oci8 currently. For example:

$db->SetTransactionMode("SERIALIZABLE");
$db->BeginTrans();
$db->Execute(...); $db->Execute(...);
$db->CommiTrans();

$db->SetTransactionMode(""); // restore to default
$db->StartTrans();
$db->Execute(...); $db->Execute(...);
$db->CompleteTrans();

Supported values to pass in:

• READ UNCOMMITTED (allows dirty reads, but fastest)
• READ COMMITTED (default postgres, mssql and oci8)
• REPEATABLE READ (default mysql)
• SERIALIZABLE (slowest and most restrictive)

You can also pass in database specific values such as 'SNAPSHOT' for mssql or 'READ ONLY' for oci8/postgres.

See transaction levels for PostgreSQL, Oracle, MySQL, and MS SQL Server.

GetAssoc($sql,$inputarr=false,$force_array=false,$first2cols=false)

Returns an associative array for the given query $sql with optional bind parameters in $inputarr. If the number of columns returned is greater to two, a 2-dimensional array is returned, with the first column of the recordset becomes the keys to the rest of the rows. If the columns is equal to two, a 1-dimensional array is created, where the the keys directly map to the values (unless $force_array is set to true, when an array is created for each value).

Examples:

We have the following data in a recordset:

row1: Apple, Fruit, Edible
row2: Cactus, Plant, Inedible
row3: Rose, Flower, Edible

GetAssoc will generate the following 2-dimensional associative array:

Apple => array[Fruit, Edible]
Cactus => array[Plant, Inedible]
Rose => array[Flower,Edible]

If the dataset is:

row1: Apple, Fruit
row2: Cactus, Plant
row3: Rose, Flower

GetAssoc will generate the following 1-dimensional associative array (with $force_array==false):

Apple => Fruit
Cactus=>Plant
Rose=>Flower

The function returns:

The associative array, or false if an error occurs.

Caching version of GetAssoc function above.

GetOne($sql,$inputarr=false)

Executes the SQL and returns the first field of the first row. The recordset and remaining rows are discarded for you automatically. If an error occur, false is returned; use ErrorNo() or ErrorMsg() to get the error details. Since 4.96/5.00, we return null if no records were found. And since 4.991/5.06, you can have change the return value if no records are found using the global variable $ADODB_GETONE_EOF: $ADODB_GETONE_EOF = false;

GetRow($sql,$inputarr=false)

Executes the SQL and returns the first row as an array. The recordset and remaining rows are discarded for you automatically. If no records are returned, an empty array is returned. If an error occurs, false is returned.

GetAll($sql,$inputarr=false)

Executes the SQL and returns the all the rows as a 2-dimensional array. The recordset is discarded for you automatically. If an error occurs, false is returned. GetArray is a synonym for GetAll.

GetCol($sql,$inputarr=false,$trim=false)

Executes the SQL and returns all elements of the first column as a 1-dimensional array. The recordset is discarded for you automatically. If an error occurs, false is returned.

CacheGetOne([$secs2cache,] $sql,$inputarr=false), CacheGetRow([$secs2cache,] $sql,$inputarr=false), CacheGetAll([$secs2cache,] $sql,$inputarr=false), CacheGetCol([$secs2cache,] $sql,$inputarr=false,$trim=false)

Similar to above Get* functions, except that the recordset is serialized and cached in the $ADODB_CACHE_DIR directory for $secs2cache seconds. Good for speeding up queries on rarely changing data. Note that the $secs2cache parameter is optional. If omitted, we use the value in $connection->cacheSecs (default is 3600 seconds, or 1 hour).

Prepare($sql )

Prepares (compiles) an SQL query for repeated execution. Bind parameters are denoted by ?, except for the oci8 driver, which uses the traditional Oracle :varname convention.

Returns an array containing the original sql statement in the first array element; the remaining elements of the array are driver dependent. If there is an error, or we are emulating Prepare( ), we return the original $sql string. This is because all error-handling has been centralized in Execute( ).

Prepare( ) cannot be used with functions that use SQL query rewriting techniques, e.g. PageExecute( ) and SelectLimit( ).

Example:

$stmt = $DB->Prepare('insert into table (col1,col2) values (?,?)');
for ($i=0; $i < $max; $i++)
	$DB->Execute($stmt,array((string) rand(), $i));

Also see InParameter(), OutParameter() and PrepareSP() below. Only supported internally by interbase, oci8 and selected ODBC-based drivers, otherwise it is emulated. There is no performance advantage to using Prepare() with emulation.

Important: Due to limitations or bugs in PHP, if you are getting errors when you using prepared queries, try setting $ADODB_COUNTRECS = false before preparing. This behaviour has been observed with ODBC.

IfNull($field, $nullReplacementValue)

Portable IFNULL function (NVL in Oracle). Returns a string that represents the function that checks whether a $field is null for the given database, and if null, change the value returned to $nullReplacementValue. Eg.

$sql = 'SELECT '.$db->IfNull('name', "'- unknown -'"). ' FROM table';

length

This is not a function, but a property. Some databases have "length" and others "len" as the function to measure the length of a string. To use this property:

  $sql = "SELECT ".$db->length."(field) from table";
  $rs = $db->Execute($sql);

random

This is not a function, but a property. This is a string that holds the sql to generate a random number between 0.0 and 1.0 inclusive.

substr

This is not a function, but a property. Some databases have "substr" and others "substring" as the function to retrieve a sub-string. To use this property:

  $sql = "SELECT ".$db->substr."(field, $offset, $length) from table";
  $rs = $db->Execute($sql);

For all databases, the 1st parameter of substr is the field, the 2nd is the offset (1-based) to the beginning of the sub-string, and the 3rd is the length of the sub-string.

Param($name)

Generates a bind placeholder portably. For most databases, the bind placeholder is "?". However some databases use named bind parameters such as Oracle, eg ":somevar". This allows us to portably define an SQL statement with bind parameters:

$sql = 'insert into table (col1,col2) values ('.$DB->Param('a').','.$DB->Param('b').')';
# generates 'insert into table (col1,col2) values (?,?)'
# or        'insert into table (col1,col2) values (:a,:b)'
$stmt = $DB->Prepare($sql);
$stmt = $DB->Execute($stmt,array('one','two'));

PrepareSP($sql, $cursor=false )

When calling stored procedures in mssql and oci8 (oracle), and you might want to directly bind to parameters that return values, or for special LOB handling. PrepareSP() allows you to do so.

Returns the same array or $sql string as Prepare( ) above. If you do not need to bind to return values, you should use Prepare( ) instead.

The 2nd parameter, $cursor is not used except with oci8. Setting it to true will force OCINewCursor to be called; this is to support output REF CURSORs.

For examples of usage of PrepareSP( ), see InParameter( ) below.

Note: in the mssql driver, preparing stored procedures requires a special function call, mssql_init( ), which is called by this function. PrepareSP( ) is available in all other drivers, and is emulated by calling Prepare( ).

InParameter($stmt, $var, $name, $maxLen = 4000, $type = false )

InParameter() is a wrapper function that calls Parameter() with $isOutput=false. The advantage of this function is that it is self-documenting, because the $isOutput parameter is no longer needed. Only for mssql and oci8 currently.

Here is an example using oci8:

# For oracle, Prepare and PrepareSP are identical
$stmt = $db->PrepareSP(
	"declare RETVAL integer; 
	begin
	:RETVAL := SP_RUNSOMETHING(:myid,:group);
	end;");
$db->InParameter($stmt,$id,'myid');
$db->InParameter($stmt,$group,'group',64);
$db->OutParameter($stmt,$ret,'RETVAL');
$db->Execute($stmt);

The same example using mssql:

# @RETVAL = SP_RUNSOMETHING @myid,@group
$stmt = $db->PrepareSP('SP_RUNSOMETHING'); 
# note that the parameter name does not have @ in front!
$db->InParameter($stmt,$id,'myid');
$db->InParameter($stmt,$group,'group',64);
# return value in mssql - RETVAL is hard-coded name 
$db->OutParameter($stmt,$ret,'RETVAL');
$db->Execute($stmt); 

Note that the only difference between the oci8 and mssql implementations is $sql.

If $type parameter is set to false, in mssql, $type will be dynamicly determined based on the type of the PHP variable passed (string => SQLCHAR, boolean =>SQLINT1, integer =>SQLINT4 or float/double=>SQLFLT8).

In oci8, $type can be set to OCI_B_FILE (Binary-File), OCI_B_CFILE (Character-File), OCI_B_CLOB (Character-LOB), OCI_B_BLOB (Binary-LOB) and OCI_B_ROWID (ROWID). To pass in a null, use $db->Parameter($stmt, $null=null, 'param').

OutParameter($stmt, $var, $name, $maxLen = 4000, $type = false )

OutParameter() is a wrapper function that calls Parameter() with $isOutput=true. The advantage of this function is that it is self-documenting, because the $isOutput parameter is no longer needed. Only for mssql and oci8 currently.

For an example, see InParameter.

Parameter($stmt, $var, $name, $isOutput=false, $maxLen = 4000, $type = false )

Note: This function is deprecated, because of the new InParameter() and OutParameter() functions. These are superior because they are self-documenting, unlike Parameter().

Adds a bind parameter suitable for return values or special data handling (eg. LOBs) after a statement has been prepared using PrepareSP(). Only for mssql and oci8 currently. The parameters are:

$stmt Statement returned by Prepare() or PrepareSP().
$var PHP variable to bind to. Make sure you pre-initialize it!
$name Name of stored procedure variable name to bind to.
[$isOutput] Indicates direction of parameter 0/false=IN 1=OUT 2= IN/OUT. This is ignored in oci8 as this driver auto-detects the direction.
[$maxLen] Maximum length of the parameter variable.
[$type] Consult mssql_bind and ocibindbyname docs at php.net for more info on legal values for type.

Lastly, in oci8, bind parameters can be reused without calling PrepareSP( ) or Parameters again. This is not possible with mssql. An oci8 example:

$id = 0; $i = 0;
$stmt = $db->PrepareSP( "update table set val=:i where id=:id");
$db->Parameter($stmt,$id,'id');
$db->Parameter($stmt,$i, 'i');
for ($cnt=0; $cnt < 1000; $cnt++) {
	$id = $cnt; 
	$i = $cnt * $cnt; # works with oci8!
	$db->Execute($stmt); 
}

Bind($stmt, $var, $size=4001, $type=false, $name=false)

This is a low-level function supported only by the oci8 driver. Avoid using unless you only want to support Oracle. The Parameter( ) function is the recommended way to go with bind variables.

Bind( ) allows you to use bind variables in your sql statement. This binds a PHP variable to a name defined in an Oracle sql statement that was previously prepared using Prepare(). Oracle named variables begin with a colon, and ADOdb requires the named variables be called :0, :1, :2, :3, etc. The first invocation of Bind() will match :0, the second invocation will match :1, etc. Binding can provide 100% speedups for insert, select and update statements.

The other variables, $size sets the buffer size for data storage, $type is the optional descriptor type OCI_B_FILE (Binary-File), OCI_B_CFILE (Character-File), OCI_B_CLOB (Character-LOB), OCI_B_BLOB (Binary-LOB) and OCI_B_ROWID (ROWID). Lastly, instead of using the default :0, :1, etc names, you can define your own bind-name using $name.

The following example shows 3 bind variables being used: p1, p2 and p3. These variables are bound to :0, :1 and :2.

$stmt = $DB->Prepare("insert into table (col0, col1, col2) values (:0, :1, :2)");
$DB->Bind($stmt, $p1);
$DB->Bind($stmt, $p2);
$DB->Bind($stmt, $p3);
for ($i = 0; $i < $max; $i++) { 
   $p1 = ?; $p2 = ?; $p3 = ?;
   $DB->Execute($stmt);
}

You can also use named variables:

$stmt = $DB->Prepare("insert into table (col0, col1, col2) values (:name0, :name1, :name2)");
$DB->Bind($stmt, $p1, "name0");
$DB->Bind($stmt, $p2, "name1");
$DB->Bind($stmt, $p3, "name2");
for ($i = 0; $i < $max; $i++) { 
   $p1 = ?; $p2 = ?; $p3 = ?;
   $DB->Execute($stmt);
}

LogSQL($enable=true)

		mysql:
		CREATE TABLE adodb_logsql (
		  created datetime NOT NULL,
		  sql0 varchar(250) NOT NULL,
		  sql1 text NOT NULL,
		  params text NOT NULL,
		  tracer text NOT NULL,
		  timer decimal(16,6) NOT NULL
		)
		
		postgres:
		CREATE TABLE adodb_logsql (
		  created timestamp NOT NULL,
		  sql0 varchar(250) NOT NULL,
		  sql1 text NOT NULL,
		  params text NOT NULL,
		  tracer text NOT NULL,
		  timer decimal(16,6) NOT NULL
		)
		
		mssql:
		CREATE TABLE adodb_logsql (
		  created datetime NOT NULL,
		  sql0 varchar(250) NOT NULL,
		  sql1 varchar(4000) NOT NULL,
		  params varchar(3000) NOT NULL,
		  tracer varchar(500) NOT NULL,
		  timer decimal(16,6) NOT NULL
		)
		
		oci8:
		CREATE TABLE adodb_logsql (
		  created date NOT NULL,
		  sql0 varchar(250) NOT NULL,
		  sql1 varchar(4000) NOT NULL,
		  params varchar(4000),
		  tracer varchar(4000),
		  timer decimal(16,6) NOT NULL
		)

	$conn->LogSQL(); // turn on logging
	  :
	$conn->Execute(...);
	  :
	$conn->LogSQL(false); // turn off logging
	
	# output summary of SQL logging results
	$perf = NewPerfMonitor($conn);
	echo $perf->SuspiciousSQL();
	echo $perf->ExpensiveSQL();

One limitation of logging is that rollback also prevents SQL from being logged.

If you prefer to use another name for the table used to store the SQL, you can override it by calling adodb_perf::table($tablename), where $tablename is the new table name (you will still need to manually create the table yourself). An example:

	include('adodb.inc.php');
	include('adodb-perf.inc.php');
	adodb_perf::table('my_logsql_table');

fnExecute and fnCacheExecute properties

These two properties allow you to define bottleneck functions for all sql statements processed by ADOdb. This allows you to perform statistical analysis and query-rewriting of your sql.

Examples of fnExecute

Here is an example of using fnExecute, to count all cached queries and non-cached queries, you can do this:

# $db is the connection object
function &CountExecs($db, $sql, $inputarray)
{
global $EXECS;

	if (!is_array(inputarray)) $EXECS++;
	# handle 2-dimensional input arrays
	else if (is_array(reset($inputarray))) $EXECS += sizeof($inputarray);
	else $EXECS++;
	
	# in PHP4.4 and PHP5, we need to return a value by reference
	$null = null;
	return $null;
}

# $db is the connection object
function CountCachedExecs($db, $secs2cache, $sql, $inputarray)
{
global $CACHED; $CACHED++;
}

$db = NewADOConnection('mysql');
$db->Connect(...);
$db->fnExecute = 'CountExecs';
$db->fnCacheExecute = 'CountCachedExecs';
 :
 :
# After many sql statements:`
printf("<p>Total queries=%d; total cached=%d</p>",$EXECS+$CACHED, $CACHED);

The fnExecute function is called before the sql is parsed and executed, so you can perform a query rewrite. If you are passing in a prepared statement, then $sql is an array (see Prepare). The fnCacheExecute function is only called if the recordset returned was cached. The function parameters match the Execute and CacheExecute functions respectively, except that $this (the connection object) is passed as the first parameter.

Since ADOdb 3.91, the behaviour of fnExecute varies depending on whether the defined function returns a value. If it does not return a value, then the $sql is executed as before. This is useful for query rewriting or counting sql queries.

On the other hand, you might want to replace the Execute function with one of your own design. If this is the case, then have your function return a value. If a value is returned, that value is returned immediately, without any further processing. This is used internally by ADOdb to implement LogSQL() functionality.

ADOConnection Utility Functions

BlankRecordSet([$queryid])

No longer available - removed since 1.99.

Concat($s1,$s2,....)

Generates the sql string used to concatenate $s1, $s2, etc together. Uses the string in the concat_operator field to generate the concatenation. Override this function if a concatenation operator is not used, eg. MySQL.

Returns the concatenated string.

DBDate($date)

Format the $date in the format the database accepts - the return string is also quoted. This is used when you are sending dates to the database (eg INSERT, UPDATE or where clause of SELECT statement). The $date parameter can be a Unix integer timestamp or an ISO format Y-m-d. Uses the fmtDate field, which holds the format to use. If null or false or '' is passed in, it will be converted to an SQL null.

Returns the date as a quoted string.

	$sql = "select * from atable where created > ".$db->DBDate("$year-$month-$day");
	$db->Execute($sql);

Note to retrieve a date column in a specific format, use SQLDate.

BindDate($date)

Format the $date in the bind format the database accepts. Normally this means that the date string is not quoted, unlike DBDate, which quotes the string.

	$sql = "select * from atable where created > ".$db->Param('0');
	// or
	$sql = "select * from atable where created > ?";
	$db->Execute($sql,array($db->BindDate("$year-$month-$day"));

	$sql = "select * from atable where created > ".$db->DBTimeStamp("$year-$month-$day $hr:$min:$secs");
	$db->Execute($sql);

	$sql = "select * from atable where created > ".$db->Param('0');
	// or
	$sql = "select * from atable where created > ?";
	$db->Execute($sql,array($db->BindTimeStamp("$year-$month-$day $hr:$min:$secs"));

	$DB->StartTrans();
	$DB->RowLock("table1","rowid=$id");
	$DB->Execute($sql1);
	$DB->Execute($sql2);
	$DB->CompleteTrans();

// In this example: dbtype = 'oci8', $db = 'mydb', $view = 'dataView', $owner = false 
function ADODB_View_PrimaryKeys($dbtype,$db,$view,$owner)
{
	switch(strtoupper($view)) {
	case 'DATAVIEW': return array('DATAID');
	default: return false;
	}
}

$db = NewADOConnection('oci8');
$db->Connect('localhost','root','','mydb'); 
$db->MetaPrimaryKeys('dataView');

	array(
		'dept_table' => array('deptkey=deptid'),
		'posn_table' => array('posn=positionid','poscategory=category')
	)

# get date one week from now
$fld = $conn->OffsetDate(7); // returns "(trunc(sysdate)+7")

# get date and time that is 60 hours from current date and time
$fld = $conn->OffsetDate(2.5, $conn->sysTimeStamp);	// returns "(sysdate+2.5)"

$conn->Execute("UPDATE TABLE SET dodate=$fld WHERE ID=$id");

 
  Y: 4-digit Year
  Q: Quarter (1-4)
  M: Month (Jan-Dec)
  m: Month (01-12)
  d: Day (01-31)
  H: Hour (00-23)
  h: Hour (1-12)
  i: Minute (00-59)
  s: Second (00-60)
  A: AM/PM indicator
  w: day of week (0-6 or 1-7 depending on DB)
  l: day of week (as string - lowercase L)
  W: week in year (0..53 for MySQL, 1..53 for PostgreSQL and Oracle)
  

 $sqlfn = $db->SQLDate('Y-\QQ','postdate'); # get sql that formats postdate to output 2002-Q1
 $sql = "SELECT $sqlfn,SUM(cogs) FROM table GROUP BY $sqlfn ORDER BY 1 desc";
 

$rs = $db->Execute($sql);
if ($rs) 
	while (!$rs->EOF) {
 		ProcessArray($rs->fields);	
		$rs->MoveNext();
	} 

$rs = $db->Execute($sql);
if ($rs)
	while ($arr = $rs->FetchRow()) {
	     # process $arr	
	}

$rs = $db->Execute('execute return_multiple_rs');
$arr1 = $rs->GetArray();
$rs->NextRecordSet();
$arr2 = $rs->GetArray();

$rs = $db->Execute('select firstname,lastname from table');
if ($rs) {
	while ($o = $rs->FetchNextObject()) {
		print "$o->FIRSTNAME, $o->LASTNAME<BR>";
	}
}

<?
include('tohtml.inc.php'); # load code common to ADOdb 
include('adodb.inc.php'); # load code common to ADOdb 
$conn = &ADONewConnection('mysql');   # create a connection 
$conn->PConnect('localhost','userid','','agora');# connect to MySQL, agora db
$sql = 'select CustomerName, CustomerID from customers'; 
$rs   = $conn->Execute($sql); 
rs2html($rs,'border=2 cellpadding=3',array('Customer Name','Customer ID'));
?>

include "/path/to/adodb.inc.php";
$ADODB_CACHE_CLASS = 'MyCacheClass';

class MyCacheClass extends ADODB_Cache_File
{
	function writecache($filename, $contents,$debug=false){...}
	function &readcache($filename, &$err, $secs2cache, $rsClass){ ...}
	 :
}

$DB = NewADOConnection($driver);
$DB->Connect(...);  ## MyCacheClass created here and stored in $ADODB_CACHE global variable.

$data = $rs->CacheGetOne($sql); ## MyCacheClass is used here for caching...

$db = NewADOConnection($driver);
$db->memCache = true; /// should we use memCache instead of caching in files
$db->memCacheHost = array($ip1, $ip2, $ip3); /// $db->memCacheHost = $ip1; still works
$db->memCachePort = 11211; /// this is default memCache port
$db->memCacheCompress = false; /// Use 'true' to store the item compressed (uses zlib)

$db->Connect(...);
$db->CacheExecute($sql);

  event_id I(11) NOTNULL AUTOINCREMENT PRIMARY,
  event_type I(4) NOTNULL  INDEX idx_evt,
  event_start_date T DEFAULT NULL INDEX id_esd,
  event_end_date T DEFAULT '0000-00-00 00:00:00' INDEX id_eted,
  event_parent I(11) UNSIGNED NOTNULL DEFAULT 0 INDEX id_evp,
  event_owner I(11) DEFAULT 0 INDEX idx_ev1,
  event_project I(11) DEFAULT 0 INDEX idx_ev1,
  event_times_recuring I(11) UNSIGNED NOTNULL DEFAULT 0,
  event_icon C(20) DEFAULT 'obj/event',
  event_description X

$db = NewADOConnection($driver);
$db->memCache = true; /// should we use memCache instead of caching in files
$db->memCacheHost = "126.0.1.1"; /// memCache host
$db->memCachePort = 11211; /// this is default memCache port
$db->memCacheCompress = false; /// Use 'true' to store the item compressed (uses zlib)

$db->Connect(...);
$db->CacheExecute($sql);

$DB = NewADOConnection('mysql');
$DB->Connect(...);
$DB->SetFetchMode(ADODB_FETCH_NUM);
$rs = $DB->Execute('select productname,productid,unitprice from products limit 10');
$rs2 = $DB->Transpose($rs);
rs2html($rs2);

oci8:  X->varchar(4000) XL->CLOB
mssql: X->XL->TEXT
mysql: X->XL->LONGTEXT
fbird: X->XL->varchar(4000)

oci8:  X->varchar(4000) XL->CLOB
mssql: X->VARCHAR(4000) XL->TEXT
mysql: X->TEXT          XL->LONGTEXT
fbird: X->VARCHAR(4000) XL->VARCHAR(32000)

   $this->_transactionID = $this->_connectionID;

   $this->_transactionID = ibase_trans($this->ibasetrans, $this->_connectionID);

	$text = 'test test test';
	$sql = "declare rs clob; begin :rs := lobinout(:sa0); end;";
	$stmt = $conn -> PrepareSP($sql);
	$conn -> InParameter($stmt,$text,'sa0', -1, OCI_B_CLOB);
	$rs = '';
	$conn -> OutParameter($stmt,$rs,'rs', -1, OCI_B_CLOB);
	$conn -> Execute($stmt);
	echo "return = ".$rs."<br>";

 - use OCINewDescriptor before binding
 - if Param is IN, uses save() before each execute. This is done automatically for you.
 - if Param is OUT, uses load() after each execute. This is done automatically for you.
 - when we bind $var as LOB, we create new descriptor and return it as a
   Bind Result, so if we want to use OUT parameters, we have to store
   somewhere &$var to load() data from LOB to it.
 - IN OUT params are not working now (should not be a big problem to fix it)
 - now mass binding not working too (I've wrote about it before)