/classphp/flourish/fDatabase.php

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<?php

/**

 * Provides a common API for different databases - will automatically use any installed extension

 * 

 * This class is implemented to use the UTF-8 character encoding. Please see

 * http://flourishlib.com/docs/UTF-8 for more information.

 * 

 * The following databases are supported:

 * 

 *  - [http://microsoft.com/sql/ MSSQL]

 *  - [http://mysql.com MySQL]

 *  - [http://oracle.com Oracle]

 *  - [http://postgresql.org PostgreSQL]

 *  - [http://sqlite.org SQLite]

 * 

 * The class will automatically use the first of the following extensions it finds:

 * 

 *  - MSSQL (via ODBC)

 *   - [http://php.net/pdo_odbc pdo_odbc]

 *   - [http://php.net/odbc odbc]

 *  - MSSQL

 *   - [http://msdn.microsoft.com/en-us/library/cc296221.aspx sqlsrv]

 *   - [http://php.net/pdo_dblib pdo_dblib]

 *   - [http://php.net/mssql mssql] (or [http://php.net/sybase sybase])

 *  - MySQL

 *   - [http://php.net/mysql mysql]

 *   - [http://php.net/mysqli mysqli]

 *   - [http://php.net/pdo_mysql pdo_mysql]

 *  - Oracle (via ODBC)

 *   - [http://php.net/pdo_odbc pdo_odbc]

 *   - [http://php.net/odbc odbc]

 *  - Oracle

 *   - [http://php.net/oci8 oci8]

 *   - [http://php.net/pdo_oci pdo_oci]

 *  - PostgreSQL

 *   - [http://php.net/pgsql pgsql]

 *   - [http://php.net/pdo_pgsql pdo_pgsql]

 *  - SQLite

 *   - [http://php.net/pdo_sqlite pdo_sqlite] (for v3.x)

 *   - [http://php.net/sqlite sqlite] (for v2.x)

 * 

 * @copyright  Copyright (c) 2007-2009 Will Bond

 * @author     Will Bond [wb] <will@flourishlib.com>

 * @license    http://flourishlib.com/license

 * 

 * @package    Flourish

 * @link       http://flourishlib.com/fDatabase

 * 

 * @version    1.0.0b18

 * @changes    1.0.0b18  Updated the class for the new fResult and fUnbufferedResult APIs, fixed ::unescape() to not touch NULLs [wb, 2009-08-12]

 * @changes    1.0.0b17  Added the ability to pass an array of all values as a single parameter to ::escape() instead of one value per parameter [wb, 2009-08-11]

 * @changes    1.0.0b16  Fixed PostgreSQL and Oracle from trying to get auto-incrementing values on inserts when explicit values were given [wb, 2009-08-06]

 * @changes    1.0.0b15  Fixed a bug where auto-incremented values would not be detected when table names were quoted [wb, 2009-07-15]

 * @changes    1.0.0b14  Changed ::determineExtension() and ::determineCharacterSet() to be protected instead of private [wb, 2009-07-08]

 * @changes    1.0.0b13  Updated ::escape() to accept arrays of values for insertion into full SQL strings [wb, 2009-07-06]

 * @changes    1.0.0b12  Updates to ::unescape() to improve performance [wb, 2009-06-15]

 * @changes    1.0.0b11  Changed replacement values in preg_replace() calls to be properly escaped [wb, 2009-06-11]

 * @changes    1.0.0b10  Changed date/time/timestamp escaping from `strtotime()` to fDate/fTime/fTimestamp for better localization support [wb, 2009-06-01]

 * @changes    1.0.0b9   Fixed a bug with ::escape() where floats that start with a . were encoded as `NULL` [wb, 2009-05-09]

 * @changes    1.0.0b8   Added Oracle support, change PostgreSQL code to no longer cause lastval() warnings, added support for arrays of values to ::escape() [wb, 2009-05-03]

 * @changes    1.0.0b7   Updated for new fCore API [wb, 2009-02-16]

 * @changes    1.0.0b6   Fixed a bug with executing transaction queries when using the mysqli extension [wb, 2009-02-12]

 * @changes    1.0.0b5   Changed @ error suppression operator to `error_reporting()` calls [wb, 2009-01-26]

 * @changes    1.0.0b4   Added a few error suppression operators back in so that developers don't get errors and exceptions [wb, 2009-01-14]

 * @changes    1.0.0b3   Removed some unnecessary error suppresion operators [wb, 2008-12-11]

 * @changes    1.0.0b2   Fixed a bug with PostgreSQL when using the PDO extension and executing an INSERT statement [wb, 2008-12-11]

 * @changes    1.0.0b    The initial implementation [wb, 2007-09-25]

 */

class fDatabase

{

	/**

	 * Composes text using fText if loaded

	 * 

	 * @param  string  $message    The message to compose

	 * @param  mixed   $component  A string or number to insert into the message

	 * @param  mixed   ...

	 * @return string  The composed and possible translated message

	 */

	static protected function compose($message)

	{

		$args = array_slice(func_get_args(), 1);

		

		if (class_exists('fText', FALSE)) {

			return call_user_func_array(

				array('fText', 'compose'),

				array($message, $args)

			);

		} else {

			return vsprintf($message, $args);

		}

	}

	

	

	/**

	 * An fCache object to cache the schema info to

	 * 

	 * @var fCache

	 */

	private $cache;

	

	/**

	 * Database connection resource or PDO object

	 * 

	 * @var mixed

	 */

	private $connection;

	

	/**

	 * The database name

	 * 

	 * @var string

	 */

	private $database;

	

	/**

	 * If debugging is enabled

	 * 

	 * @var boolean

	 */

	private $debug;

	

	/**

	 * The extension to use for the database specified

	 * 

	 * Options include:

	 * 

	 *  - `'mssql'`

	 *  - `'mysql'`

	 *  - `'mysqli'`

	 *  - `'oci8'`

	 *  - `'odbc'`

	 *  - `'pgsql'`

	 *  - `'sqlite'`

	 *  - `'sqlsrv'`

	 *  - `'pdo'`

	 * 

	 * @var string

	 */

	protected $extension;

	

	/**

	 * The host the database server is located on

	 * 

	 * @var string

	 */

	private $host;

	

	/**

	 * If a transaction is in progress

	 * 

	 * @var boolean

	 */

	private $inside_transaction;

	

	/**

	 * The password for the user specified

	 * 

	 * @var string

	 */

	private $password;

	

	/**

	 * The port number for the host

	 * 

	 * @var string

	 */

	private $port;

	

	/**

	 * The total number of seconds spent executing queries

	 * 

	 * @var float

	 */

	private $query_time;

	

	/**

	 * A cache of database-specific code

	 * 

	 * @var array 

	 */

	protected $schema_info;

	

	/**

	 * The millisecond threshold for triggering a warning about SQL performance

	 * 

	 * @var integer

	 */

	private $slow_query_threshold;

	

	/**

	 * The fSQLTranslation object for this database

	 * 

	 * @var object

	 */

	private $translation;

	

	/**

	 * The database type: `'mssql'`, `'mysql'`, `'oracle'`, `'postgresql'`, or `'sqlite'`

	 * 

	 * @var string

	 */

	private $type;

	

	/**

	 * The unbuffered query instance

	 * 

	 * @var fUnbufferedResult

	 */

	private $unbuffered_result;

	

	/**

	 * The user to connect to the database as

	 * 

	 * @var string

	 */

	private $username;

	

	

	/**

	 * Configures the connection to a database - connection is not made until the first query is executed

	 * 

	 * @param  string  $type      The type of the database: `'mssql'`, `'mysql'`, `'oracle'`, `'postgresql'`, `'sqlite'`

	 * @param  string  $database  Name of the database. If an ODBC connection `'dsn:'` concatenated with the DSN, if SQLite the path to the database file.

	 * @param  string  $username  Database username - not used for SQLite

	 * @param  string  $password  The password for the username specified - not used for SQLite

	 * @param  string  $host      Database server host or IP, defaults to localhost - not used for SQLite or ODBC connections. MySQL socket connection can be made by entering `'sock:'` followed by the socket path. PostgreSQL socket connection can be made by passing just `'sock:'`. 

	 * @param  integer $port      The port to connect to, defaults to the standard port for the database type specified - not used for SQLite or ODBC connections 

	 * @return fDatabase

	 */

	public function __construct($type, $database, $username=NULL, $password=NULL, $host=NULL, $port=NULL)

	{

		$valid_types = array('mssql', 'mysql', 'oracle', 'postgresql', 'sqlite');

		if (!in_array($type, $valid_types)) {

			throw new fProgrammerException(

				'The database type specified, %1$s, is invalid. Must be one of: %2$s.',

				$type,

				join(', ', $valid_types)

			);

		}

		

		if (empty($database)) {

			throw new fProgrammerException('No database was specified');

		}

		

		if ($host === NULL) {

			$host = 'localhost';

		}

		

		$this->type     = $type;

		$this->database = $database;

		$this->username = $username;

		$this->password = $password;

		$this->host     = $host;

		$this->port     = $port;

		

		$this->schema_info = array();

		

		$this->determineExtension();

	}

	

	

	/**

	 * Closes the open database connection

	 * 

	 * @internal

	 * 

	 * @return void

	 */

	public function __destruct()

	{

		if (!$this->connection) { return; }

		

		fCore::debug('Total query time: ' . $this->query_time . ' seconds', $this->debug);

		if ($this->extension == 'mssql') {

			mssql_close($this->connection);

		} elseif ($this->extension == 'mysql') {

			mysql_close($this->connection);

		} elseif ($this->extension == 'mysqli') {

			mysqli_close($this->connection);

		} elseif ($this->extension == 'oci8') {

			oci_close($this->connection);

		} elseif ($this->extension == 'odbc') {

			odbc_close($this->connection);

		} elseif ($this->extension == 'pgsql') {

			pg_close($this->connection);

		} elseif ($this->extension == 'sqlite') {

			sqlite_close($this->connection);

		} elseif ($this->extension == 'sqlsrv') {

			sqlsrv_close($this->connection);

		} elseif ($this->extension == 'pdo') {

			// PDO objects close their own connections when destroyed

		}

	}

	

	

	/**

	 * All requests that hit this method should be requests for callbacks

	 * 

	 * @internal

	 * 

	 * @param  string $method  The method to create a callback for

	 * @return callback  The callback for the method requested

	 */

	public function __get($method)

	{

		return array($this, $method);		

	}

	

	

	/**

	 * Checks to see if an SQL error occured

	 * 

	 * @param  fResult|fUnbufferedResult $result      The result object for the query

	 * @param  mixed                     $extra_info  The sqlite extension will pass a string error message, the oci8 extension will pass the statement resource

	 * @return void

	 */

	private function checkForError($result, $extra_info=NULL)

	{

		if ($result->getResult() === FALSE) {

			

			if ($this->extension == 'mssql') {

				$message = mssql_get_last_message();

			} elseif ($this->extension == 'mysql') {

				$message = mysql_error($this->connection);

			} elseif ($this->extension == 'mysqli') {

				$message = mysqli_error($this->connection);

			} elseif ($this->extension == 'oci8') {

				$error_info = oci_error($extra_info);

				$message = $error_info['message'];

			} elseif ($this->extension == 'odbc') {

				$message = odbc_errormsg($this->connection);

			} elseif ($this->extension == 'pgsql') {

				$message = pg_last_error($this->connection);

			} elseif ($this->extension == 'sqlite') {

				$message = $extra_info;

			} elseif ($this->extension == 'sqlsrv') {

				$error_info = sqlsrv_errors(SQLSRV_ERR_ALL);

				$message = $error_info[0]['message'];

			} elseif ($this->extension == 'pdo') {

				$error_info = $this->connection->errorInfo();

				$message = $error_info[2];

			}

			

			$db_type_map = array(

				'mssql'      => 'MSSQL',

				'mysql'      => 'MySQL',

				'oracle'     => 'Oracle',

				'postgresql' => 'PostgreSQL',

				'sqlite'     => 'SQLite'

			);

			

			throw new fSQLException(

				'%1$s error (%2$s) in %3$s',

				$db_type_map[$this->type],

				$message,

				$result->getSQL()

			);

		}

	}

	

	

	/**

	 * Clears all of the schema info out of the object and, if set, the fCache object

	 * 

	 * @return void

	 */

	public function clearCache()

	{

		$this->schema_info = array();

		if ($this->cache) {

			$this->cache->delete($this->makeCachePrefix() . 'schema_info');

		}

		if ($this->type == 'mssql') {

			$this->determineCharacterSet();		

		}

	}

	

	

	/**

	 * Connects to the database specified if no connection exists

	 * 

	 * @return void

	 */

	private function connectToDatabase()

	{

		// Don't try to reconnect if we are already connected

		if ($this->connection) { return; }

		

		// Establish a connection to the database

		if ($this->extension == 'pdo') {

			$odbc = strtolower(substr($this->database, 0, 4)) == 'dsn:';

			if ($this->type == 'mssql') {

				if ($odbc) {

					$dsn = 'odbc:' . substr($this->database, 4);

				} else {

					$separator = (fCore::checkOS('windows')) ? ',' : ':';

					$port      = ($this->port) ? $separator . $this->port : '';

					$driver    = (fCore::checkOs('windows')) ? 'mssql' : 'dblib';

					$dsn = $driver . ':host=' . $this->host . $port . ';dbname=' . $this->database;

				}

				

			} elseif ($this->type == 'mysql') {

				if (substr($this->host, 0, 5) == 'sock:') {

					$dsn = 'mysql:unix_socket=' . substr($this->host, 5) . ';dbname=' . $this->database;	

				} else {

					$port = ($this->port) ? ';port=' . $this->port : '';

					$dsn  = 'mysql:host=' . $this->host . ';dbname=' . $this->database . $port;

				}

				

			} elseif ($this->type == 'oracle') {

				if ($odbc) {

					$dsn = 'odbc:' . substr($this->database, 4);

				} else {

					$port = ($this->port) ? ':' . $this->port : '';

					$dsn  = 'oci:dbname=' . $this->host . $port . '/' . $this->database . ';charset=AL32UTF8';

				}

				

			} elseif ($this->type == 'postgresql') {

				

				$dsn = 'pgsql:dbname=' . $this->database;

				if ($this->host && $this->host != 'sock:') {

					$dsn .= ' host=' . $this->host;	

				}

				if ($this->port) {

					$dsn .= ' port=' . $this->port;	

				}

				

			} elseif ($this->type == 'sqlite') {

				$dsn = 'sqlite:' . $this->database;

			}

			

			try {

				$this->connection = new PDO($dsn, $this->username, $this->password);	

				if ($this->type == 'mysql') {

					$this->connection->setAttribute(PDO::MYSQL_ATTR_DIRECT_QUERY, 1);	

				}

			} catch (PDOException $e) {

				$this->connection = FALSE;

			}

		}

		

		if ($this->extension == 'sqlite') {

			$this->connection = sqlite_open($this->database);

		}

		

		if ($this->extension == 'mssql') {

			$separator        = (fCore::checkOS('windows')) ? ',' : ':';

			$this->connection = mssql_connect(($this->port) ? $this->host . $separator . $this->port : $this->host, $this->username, $this->password);

			if ($this->connection !== FALSE && mssql_select_db($this->database, $this->connection) === FALSE) {

				$this->connection = FALSE;

			}

		}

		

		if ($this->extension == 'mysql') {

			if (substr($this->host, 0, 5) == 'sock:') {

				$host = substr($this->host, 4);

			} elseif ($this->port) {

				$host = $this->host . ':' . $this->port;	

			} else {

				$host = $this->host;	

			}

			$this->connection = mysql_connect($host, $this->username, $this->password);

			if ($this->connection !== FALSE && mysql_select_db($this->database, $this->connection) === FALSE) {

				$this->connection = FALSE;

			}

		}

			

		if ($this->extension == 'mysqli') {

			if (substr($this->host, 0, 5) == 'sock:') {

				$this->connection = mysqli_connect('localhost', $this->username, $this->password, $this->database, $this->port, substr($this->host, 5));

			} elseif ($this->port) {

				$this->connection = mysqli_connect($this->host, $this->username, $this->password, $this->database, $this->port);

			} else {

				$this->connection = mysqli_connect($this->host, $this->username, $this->password, $this->database);

			}

		}

		

		if ($this->extension == 'oci8') {

			$this->connection = oci_connect($this->username, $this->password, $this->host . ($this->port ? ':' . $this->port : '') . '/' . $this->database, 'AL32UTF8');

		}

		

		if ($this->extension == 'odbc') {

			$this->connection = odbc_connect(substr($this->database, 4), $this->username, $this->password);

		}

			

		if ($this->extension == 'pgsql') {

			$connection_string = "dbname='" . addslashes($this->database) . "'";

			if ($this->host && $this->host != 'sock:') {

				$connection_string .= " host='" . addslashes($this->host) . "'";	

			}

			if ($this->username) {

				$connection_string .= " user='" . addslashes($this->username) . "'";

			}

			if ($this->password) {

				$connection_string .= " password='" . addslashes($this->password) . "'";

			}

			if ($this->port) {

				$connection_string .= " port='" . $this->port . "'";

			}

			$this->connection = pg_connect($connection_string);

		}

		

		if ($this->extension == 'sqlsrv') {

			$options = array(

				'Database' => $this->database,

				'UID'      => $this->username,

				'PWD'      => $this->password

			);

			$this->connection = sqlsrv_connect($this->host, $options);

		}

		

		// Ensure the connection was established

		if ($this->connection === FALSE) {

			throw new fConnectivityException(

				'Unable to connect to database'

			);

		}

		

		// Make MySQL act more strict and use UTF-8

		if ($this->type == 'mysql') {

			$this->query("SET SQL_MODE = 'REAL_AS_FLOAT,PIPES_AS_CONCAT,ANSI_QUOTES,IGNORE_SPACE'");

			$this->query("SET NAMES 'utf8'");

			$this->query("SET CHARACTER SET utf8");

		}

		

		// Make SQLite behave like other DBs for assoc arrays

		if ($this->type == 'sqlite') {

			$this->query('PRAGMA short_column_names = 1');

		}

		

		// Fix some issues with mssql

		if ($this->type == 'mssql') {

			if (!isset($this->schema_info['character_set'])) {

				$this->determineCharacterSet();

			}

			$this->query('SET TEXTSIZE 65536');

		}

		

		// Make PostgreSQL use UTF-8

		if ($this->type == 'postgresql') {

			$this->query("SET NAMES 'UTF8'");

		}

		

		// Oracle has different date and timestamp defaults

		if ($this->type == 'oracle') {

			$this->query("ALTER SESSION SET NLS_DATE_FORMAT = 'YYYY-MM-DD'");

			$this->query("ALTER SESSION SET NLS_TIMESTAMP_FORMAT = 'YYYY-MM-DD HH24:MI:SS'");

			$this->query("ALTER SESSION SET NLS_TIMESTAMP_TZ_FORMAT = 'YYYY-MM-DD HH24:MI:SS TZR'");

			$this->query("ALTER SESSION SET NLS_TIME_FORMAT = 'HH24:MI:SS'");

			$this->query("ALTER SESSION SET NLS_TIME_TZ_FORMAT = 'HH24:MI:SS TZR'");

		}

	}

	

	

	/**

	 * Determines the character set of a SQL Server database

	 * 

	 * @return void

	 */

	protected function determineCharacterSet()

	{

		$this->schema_info['character_set'] = 'WINDOWS-1252';

		$this->schema_info['character_set'] = $this->query("SELECT 'WINDOWS-' + CONVERT(VARCHAR, COLLATIONPROPERTY(CONVERT(NVARCHAR, DATABASEPROPERTYEX(DB_NAME(), 'Collation')), 'CodePage')) AS charset")->fetchScalar();

		if ($this->cache) {

			$this->cache->set($this->makeCachePrefix() . 'schema_info', $this->schema_info);	

		}

	}

	

	

	/**

	 * Figures out which extension to use for the database type selected

	 * 

	 * @return void

	 */

	protected function determineExtension()

	{

		switch ($this->type) {

			

			case 'mssql':

			

				$odbc = strtolower(substr($this->database, 0, 4)) == 'dsn:';

				

				if ($odbc) {

					if (extension_loaded('odbc')) {

						$this->extension = 'odbc';

						

					} elseif (class_exists('PDO', FALSE) && in_array('odbc', PDO::getAvailableDrivers())) {

						$this->extension = 'pdo';

						

					} else {

						$type = 'MSSQL (ODBC)';

						$exts = 'odbc, pdo_odbc';

					}

					

				} else {

					if (extension_loaded('sqlsrv')) {

						$this->extension = 'sqlsrv';

						

					} elseif (extension_loaded('mssql')) {

						$this->extension = 'mssql';

						

					} elseif (class_exists('PDO', FALSE) && (in_array('dblib', PDO::getAvailableDrivers()) || in_array('mssql', PDO::getAvailableDrivers()))) {

						$this->extension = 'pdo';

						

					} else {

						$type = 'MSSQL';

						$exts = 'mssql, sqlsrv, pdo_dblib (linux), pdo_mssql (windows)';

					}

				}

				break;

			

			

			case 'mysql':

			

				if (extension_loaded('mysql')) {

					$this->extension = 'mysql';

					

				} elseif (class_exists('PDO', FALSE) && in_array('mysql', PDO::getAvailableDrivers())) {

					$this->extension = 'pdo';

					

				} elseif (extension_loaded('mysqli')) {

					$this->extension = 'mysqli';

					

				} else {

					$type = 'MySQL';

					$exts = 'mysql, pdo_mysql, mysqli';

				}

				break;

				

				

			case 'oracle':

			

				$odbc = strtolower(substr($this->database, 0, 4)) == 'dsn:';

				

				if ($odbc) {

					if (extension_loaded('odbc')) {

						$this->extension = 'odbc';

						

					} elseif (class_exists('PDO', FALSE) && in_array('odbc', PDO::getAvailableDrivers())) {

						$this->extension = 'pdo';

						

					} else {

						$type = 'Oracle (ODBC)';

						$exts = 'odbc, pdo_odbc';

					}

					

				} else {

					if (extension_loaded('oci8')) {

						$this->extension = 'oci8';

						

					} elseif (class_exists('PDO', FALSE) && in_array('oci', PDO::getAvailableDrivers())) {

						$this->extension = 'pdo';

						

					} else {

						$type = 'Oracle';

						$exts = 'oci8, pdo_oci';

					}

				}

				break;

			

			

			case 'postgresql':

			

				if (extension_loaded('pgsql')) {

					$this->extension = 'pgsql';

					

				} elseif (class_exists('PDO', FALSE) && in_array('pgsql', PDO::getAvailableDrivers())) {

					$this->extension = 'pdo';

					

				} else {

					$type = 'PostgreSQL';

					$exts = 'pgsql, pdo_pgsql';

				}

				break;

				

				

			case 'sqlite':

			

				$sqlite_version = 0;

				

				if (file_exists($this->database)) {

					

					$database_handle  = fopen($this->database, 'r');

					$database_version = fread($database_handle, 64);

					fclose($database_handle);

					

					if (strpos($database_version, 'SQLite format 3') !== FALSE) {

						$sqlite_version = 3;

					} elseif (strpos($database_version, '** This file contains an SQLite 2.1 database **') !== FALSE) {

						$sqlite_version = 2;

					} else {

						throw new fConnectivityException(

							'The database specified does not appear to be a valid %1$s or %2$s database',

							'SQLite v2.1',

							'v3'

						);

					}

				}

				

				if ((!$sqlite_version || $sqlite_version == 3) && class_exists('PDO', FALSE) && in_array('sqlite', PDO::getAvailableDrivers())) {

					$this->extension = 'pdo';

					

				} elseif ($sqlite_version == 3 && (!class_exists('PDO', FALSE) || !in_array('sqlite', PDO::getAvailableDrivers()))) {

					throw new fEnvironmentException(

						'The database specified is an %1$s database and the %2$s extension is not installed',

						'SQLite v3',

						'pdo_sqlite'

					);

				

				} elseif ((!$sqlite_version || $sqlite_version == 2) && extension_loaded('sqlite')) {

					$this->extension = 'sqlite';

					

				} elseif ($sqlite_version == 2 && !extension_loaded('sqlite')) {

					throw new fEnvironmentException(

						'The database specified is an %1$s database and the %2$s extension is not installed',

						'SQLite v2.1',

						'sqlite'

					);

				

				} else {

					$type = 'SQLite';

					$exts = 'pdo_sqlite, sqlite';

				}

				break;

		}

		

		if (!$this->extension) {

			throw new fEnvironmentException(

				'The server does not have any of the following extensions for %2$s support: %2$s',

				$type,

				$exts

			);

		}

	}

	

	

	/**

	 * Sets the schema info to be cached to the fCache object specified

	 * 

	 * @param  fCache $cache  The cache to cache to

	 * @return void

	 */

	public function enableCaching($cache)

	{

		$this->cache = $cache;

		

		$this->schema_info = $this->cache->get($this->makeCachePrefix() . 'schema_info', array());

	}

	

	

	/**

	 * Sets if debug messages should be shown

	 * 

	 * @param  boolean $flag  If debugging messages should be shown

	 * @return void

	 */

	public function enableDebugging($flag)

	{

		$this->debug = (boolean) $flag;

	}

	

	

	/**

	 * Sets a flag to trigger a PHP warning message whenever a query takes longer than the millisecond threshold specified

	 * 

	 * It is recommended to use the error handling features of

	 * fCore::enableErrorHandling() to log or email these warnings.

	 * 

	 * @param  integer $threshold  The limit (in milliseconds) of how long an SQL query can take before a warning is triggered

	 * @return void

	 */

	public function enableSlowQueryWarnings($threshold)

	{

		$this->slow_query_threshold = (int) $threshold;

	}

	

	

	/**

	 * Escapes a value for insertion into SQL

	 * 

	 * The valid data types are:

	 * 

	 *  - `'blob'`

	 *  - `'boolean'`

	 *  - `'date'`

	 *  - `'float'`

	 *  - `'integer'`

	 *  - `'string'` (also varchar, char or text)

	 *  - `'varchar'`

	 *  - `'char'`

	 *  - `'text'`

	 *  - `'time'`

	 *  - `'timestamp'`

	 * 

	 * In addition to being able to specify the data type, you can also pass

	 * in an SQL statement with data type placeholders in the following form:

	 *   

	 *  - `%l` for a blob

	 *  - `%b` for a boolean

	 *  - `%d` for a date

	 *  - `%f` for a float

	 *  - `%i` for an integer

	 *  - `%s` for a string

	 *  - `%t` for a time

	 *  - `%p` for a timestamp

	 * 

	 * Depending on what `$sql_or_type` and `$value` are, the output will be

	 * slightly different. If `$sql_or_type` is a data type or a single

	 * placeholder and `$value` is:

	 * 

	 *  - a scalar value - an escaped SQL string is returned

	 *  - an array - an array of escaped SQL strings is returned

	 * 

	 * If `$sql_or_type` is a SQL string and `$value` is:

	 * 

	 *  - a scalar value - the escaped value is inserted into the SQL string

	 *  - an array - the escaped values are inserted into the SQL string separated by commas

	 * 

	 * If `$sql_or_type` is a SQL string, it is also possible to pass an array

	 * of all values as a single parameter instead of one value per parameter.

	 * An example would look like the following:

	 * 

	 * {{{

	 * #!php

	 * $db->escape(

	 *     "SELECT * FROM users WHERE status = %s AND authorization_level = %s",

	 *     array('Active', 'Admin')

	 * );

	 * }}}

	 * 

	 * @param  string $sql_or_type  This can either be the data type to escape or an SQL string with a data type placeholder - see method description

	 * @param  mixed  $value        The value to escape - both single values and arrays of values are supported, see method description for details

	 * @param  mixed  ...

	 * @return mixed  The escaped value/SQL or an array of the escaped values

	 */

	public function escape($sql_or_type, $value)

	{

		$values = array_slice(func_get_args(), 1);

		

		if (sizeof($values) < 1) {

			throw new fProgrammerException(

				'No value was specified to escape'

			);	

		}

		

		// Convert all objects into strings

		$values = $this->scalarize($values);

		

		$value = array_shift($values);

		

		// Handle single value escaping

		$callback = NULL;

		

		switch ($sql_or_type) {

			case 'blob':

			case '%l':

				$callback = $this->escapeBlob;

				break;

			case 'boolean':

			case '%b':

				$callback = $this->escapeBoolean;

				break;

			case 'date':

			case '%d':

				$callback = $this->escapeDate;

				break;

			case 'float':

			case '%f':

				$callback = $this->escapeFloat;

				break;

			case 'integer':

			case '%i':

				$callback = $this->escapeInteger;

				break;

			case 'string':

			case 'varchar':

			case 'char':

			case 'text':

			case '%s':

				$callback = $this->escapeString;

				break;

			case 'time':

			case '%t':

				$callback = $this->escapeTime;

				break;

			case 'timestamp':

			case '%p':

				$callback = $this->escapeTimestamp;

				break;

		}

		

		if ($callback) {

			if (is_array($value)) {

				// If the values were passed as a single array, this handles that

				if (count($value) == 1 && is_array(current($value))) {

					$value = current($value);

				}

				return array_map($callback, $value);		

			}

			return call_user_func($callback, $value);

		}	

		

		// Fix \' in MySQL and PostgreSQL

		if(($this->type == 'mysql' || $this->type == 'postgresql') && strpos($sql_or_type, '\\') !== FALSE) {

			$sql_or_type = preg_replace("#(?<!\\\\)((\\\\{2})*)\\\\'#", "\\1''", $sql_or_type);	

		}

		

		// Separate the SQL from quoted values

		preg_match_all("#(?:'([^']*(?:'')*)*?')|(?:[^']+)#", $sql_or_type, $matches);

		

		$temp_sql = '';

		$strings = array();

		

		// Replace strings with a placeholder so they don't mess use the regex parsing

		foreach ($matches[0] as $match) {

			if ($match[0] == "'") {

				$strings[] = $match;

				$match = ':string_' . (sizeof($strings)-1);

			}

			$temp_sql .= $match;

		}

		

		$pieces = preg_split('#(%[lbdfistp])\b#', $temp_sql, -1, PREG_SPLIT_DELIM_CAPTURE|PREG_SPLIT_NO_EMPTY);

		$sql = '';

		

		// If the values were passed as a single array, this handles that

		if (count($values) == 0 && is_array($value)) {

			$placeholders = 0;

			foreach ($pieces as $piece) {

				if (strlen($piece) == 2 && $piece[0] == '%') {

					$placeholders++;

				}	

			}

			

			if ($placeholders == count($value)) {

				$values = $value;

				$value  = array_shift($values);	

			}

		}

		

		$missing_values = -1;

		

		foreach ($pieces as $piece) {

			switch ($piece) {

				case '%l':

					$callback = $this->escapeBlob;

					break;

				case '%b':

					$callback = $this->escapeBoolean;

					break;

				case '%d':

					$callback = $this->escapeDate;

					break;

				case '%f':

					$callback = $this->escapeFloat;

					break;

				case '%i':

					$callback = $this->escapeInteger;

					break;

				case '%s':

					$callback = $this->escapeString;

					break;

				case '%t':

					$callback = $this->escapeTime;

					break;

				case '%p':

					$callback = $this->escapeTimestamp;

					break;

				default:

					$sql .= $piece;

					continue 2;	

			}

			

			if (is_array($value)) {

				$sql .= join(', ', array_map($callback, $value));		

			} else {

				$sql .= call_user_func($callback, $value);

			}

					

			if (sizeof($values)) {

				$value = array_shift($values);

			} else {

				$value = NULL;

				$missing_values++;	

			}

		}

		

		if ($missing_values > 0) {

			throw new fProgrammerException(

				'%1$s value(s) are missing for the placeholders in: %2$s',

				$missing_values,

				$sql_or_type

			);	

		}

		

		if (sizeof($values)) {

			throw new fProgrammerException(

				'%1$s extra value(s) were passed for the placeholders in: %2$s',

				sizeof($values),

				$sql_or_type

			); 	

		}

		

		$string_number = 0;

		foreach ($strings as $string) {

			$string = strtr($string, array('\\' => '\\\\', '$' => '\\$'));

			$sql    = preg_replace('#:string_' . $string_number++ . '\b#', $string, $sql);	

		}

		

		return $sql;

	}

	

	

	/**

	 * Escapes a blob for use in SQL, includes surround quotes when appropriate

	 * 

	 * A `NULL` value will be returned as `'NULL'`

	 * 

	 * @param  string $value  The blob to escape

	 * @return string  The escaped blob

	 */

	private function escapeBlob($value)

	{

		if ($value === NULL) {

			return 'NULL';

		}

		

		$this->connectToDatabase();

		

		if ($this->type == 'mysql') {

			return "x'" . bin2hex($value) . "'";

			

		} elseif ($this->type == 'postgresql') {

			$output = '';

			for ($i=0; $i<strlen($value); $i++) {

				$output .= '\\\\' . str_pad(decoct(ord($value[$i])), 3, '0', STR_PAD_LEFT);

			}

			return "E'" . $output . "'";

			

		} elseif ($this->extension == 'sqlite') {

			return "'" . bin2hex($value) . "'";

			

		} elseif ($this->type == 'sqlite') {

			return "X'" . bin2hex($value) . "'";

			

		} elseif ($this->type == 'mssql') {

			return '0x' . bin2hex($value);

			

		} elseif ($this->type == 'oracle') {

			return "'" . bin2hex($value) . "'";

		}

	}

	

	

	/**

	 * Escapes a boolean for use in SQL, includes surround quotes when appropriate

	 * 

	 * A `NULL` value will be returned as `'NULL'`

	 * 

	 * @param  boolean $value  The boolean to escape

	 * @return string  The database equivalent of the boolean passed

	 */

	private function escapeBoolean($value)

	{

		if ($value === NULL) {

			return 'NULL';

		}

		

		if (in_array($this->type, array('postgresql', 'mysql'))) {

			return ($value) ? 'TRUE' : 'FALSE';

		} elseif (in_array($this->type, array('mssql', 'sqlite'))) {

			return ($value) ? "'1'" : "'0'";

		} elseif ($this->type == 'oracle') {

			return ($value) ? '1' : '0';	

		}

	}

	

	

	/**

	 * Escapes a date for use in SQL, includes surrounding quotes

	 * 

	 * A `NULL` or invalid value will be returned as `'NULL'`

	 * 

	 * @param  string $value  The date to escape

	 * @return string  The escaped date

	 */

	private function escapeDate($value)

	{

		if ($value === NULL) {

			return 'NULL';

		}

		

		try {

			$value = new fDate($value);

			return "'" . $value->format('Y-m-d') . "'";

			

		} catch (fValidationException $e) {

			return 'NULL';

		}

	}

	

	

	/**

	 * Escapes a float for use in SQL

	 * 

	 * A `NULL` value will be returned as `'NULL'`

	 * 

	 * @param  float $value  The float to escape

	 * @return string  The escaped float

	 */

	private function escapeFloat($value)

	{

		if ($value === NULL) {

			return 'NULL';

		}

		if (!strlen($value)) {

			return 'NULL';

		}

		if (!preg_match('#^[+\-]?([0-9]+(\.[0-9]+)?|(\.[0-9]+))$#D', $value)) {

			return 'NULL';

		}

		return (string) $value;

	}

	

	

	/**

	 * Escapes an integer for use in SQL

	 * 

	 * A `NULL` or invalid value will be returned as `'NULL'`

	 * 

	 * @param  integer $value  The integer to escape

	 * @return string  The escaped integer

	 */

	private function escapeInteger($value)

	{

		if ($value === NULL) {

			return 'NULL';

		}

		if (!strlen($value)) {

			return 'NULL';

		}

		if (!preg_match('#^[+\-]?[0-9]+$#D', $value)) {

			return 'NULL';

		}

		return (string) $value;

	}

	

	

	/**

	 * Escapes a string for use in SQL, includes surrounding quotes

	 * 

	 * A `NULL` value will be returned as `'NULL'`

	 * 

	 * @param  string $value  The string to escape

	 * @return string  The escaped string

	 */

	private function escapeString($value)

	{

		if ($value === NULL) {

			return 'NULL';

		}

		

		$this->connectToDatabase();

		

		if ($this->extension == 'mysql') {

			return "'" . mysql_real_escape_string($value, $this->connection) . "'";

		} elseif ($this->extension == 'mysqli') {

			return "'" . mysqli_real_escape_string($this->connection, $value) . "'";

		} elseif ($this->extension == 'pgsql') {

			return "'" . pg_escape_string($value) . "'";

		} elseif ($this->extension == 'sqlite') {

			return "'" . sqlite_escape_string($value) . "'";

		} elseif ($this->type == 'oracle') {

			return "'" . str_replace("'", "''", $value) . "'";

			

		} elseif ($this->type == 'mssql') {

			

			// If there are any non-ASCII characters, we need to escape

			if (preg_match('#[^\x00-\x7F]#', $value)) {

				preg_match_all('#.|^\z#us', $value, $characters);

				$output    = "";

				$last_type = NULL;

				foreach ($characters[0] as $character) {

					if (strlen($character) > 1) {

						$b = array_map('ord', str_split($character));

						switch (strlen($character)) {

							case 2:

								$bin = substr(decbin($b[0]), 3) .

										   substr(decbin($b[1]), 2);

								break;

							

							case 3:

								$bin = substr(decbin($b[0]), 4) .

										   substr(decbin($b[1]), 2) .

										   substr(decbin($b[2]), 2);

								break;

							

							// If it is a 4-byte character, MSSQL can't store it

							// so instead store a ?

							default:

								$output .= '?';

								continue;

						}

						if ($last_type == 'nchar') {

							$output .= '+';

						} elseif ($last_type == 'char') {

							$output .= "'+";

						}		

						$output .= "NCHAR(" . bindec($bin) . ")";

						$last_type = 'nchar';

					} else {

						if (!$last_type) {

							$output .= "'";

						} elseif ($last_type == 'nchar') {

							$output .= "+'";	

						}

						$output .= $character;

						// Escape single quotes

						if ($character == "'") {

							$output .= "'";

						}

						$last_type = 'char';

					}

				}

				if ($last_type == 'char') {

					$output .= "'";

				} elseif (!$last_type) {

					$output .= "''";	

				}

			

			// ASCII text is normal

			} else {

				$output = "'" . str_replace("'", "''", $value) . "'";

			}

			

			# a \ before a \r\n has to be escaped with another \

			return preg_replace('#(?<!\\\\)\\\\(?=\r\n)#', '\\\\\\\\', $output);

		

		} elseif ($this->extension == 'pdo') {

			return $this->connection->quote($value);

		}

	}

	

	

	/**

	 * Escapes a time for use in SQL, includes surrounding quotes

	 * 

	 * A `NULL` or invalid value will be returned as `'NULL'`

	 * 

	 * @param  string $value  The time to escape

	 * @return string  The escaped time

	 */

	private function escapeTime($value)

	{

		if ($value === NULL) {

			return 'NULL';

		}

		

		try {

			$value = new fTime($value);

			

			if ($this->type == 'mssql' || $this->type == 'oracle') {

				return "'" . $value->format('1970-01-01 H:i:s') . "'";	

			}

			

			return "'" . $value->format('H:i:s') . "'";

			

		} catch (fValidationException $e) {

			return 'NULL';

		}

	}

	

	

	/**

	 * Escapes a timestamp for use in SQL, includes surrounding quotes

	 * 

	 * A `NULL` or invalid value will be returned as `'NULL'`

	 * 

	 * @param  string $value  The timestamp to escape

	 * @return string  The escaped timestamp

	 */

	private function escapeTimestamp($value)

	{

		if ($value === NULL) {

			return 'NULL';

		}

		

		try {

			$value = new fTimestamp($value);

			return "'" . $value->format('Y-m-d H:i:s') . "'";

			

		} catch (fValidationException $e) {

			return 'NULL';

		}

	}

	

	

	/**

	 * Executes an SQL query

	 * 

	 * @param  fResult $result  The result object for the query

	 * @return void

	 */

	private function executeQuery($result)

	{

		// We don't want errors and an exception

		$old_level = error_reporting(error_reporting() & ~E_WARNING);

		

		if ($this->extension == 'mssql') {

			$result->setResult(mssql_query($result->getSQL(), $this->connection));

			

		} elseif ($this->extension == 'mysql') {

			$result->setResult(mysql_query($result->getSQL(), $this->connection));

			

		} elseif ($this->extension == 'mysqli') {

			$result->setResult(mysqli_query($this->connection, $result->getSQL()));

			

		} elseif ($this->extension == 'oci8') {

			$oci_statement = oci_parse($this->connection, $result->getSQL());

			if (oci_execute($oci_statement, $this->inside_transaction ? OCI_DEFAULT : OCI_COMMIT_ON_SUCCESS)) {

				oci_fetch_all($oci_statement, $rows, 0, -1, OCI_FETCHSTATEMENT_BY_ROW + OCI_ASSOC);

				$result->setResult($rows);

				unset($rows);	

			} else {

				$result->setResult(FALSE);

			}

			

		} elseif ($this->extension == 'odbc') {

			$resource = odbc_exec($this->connection, $result->getSQL());

			if (is_resource($resource)) {

				$rows = array();

				// Allow up to 1MB of binary data

				odbc_longreadlen($resource, 1048576);

				odbc_binmode($resource, ODBC_BINMODE_CONVERT);

				while ($row = odbc_fetch_array($resource)) {

					$rows[] = $row;

				}

				$result->setResult($rows);

				unset($rows);

			} else {

				$result->setResult($resource);

			}

			

		} elseif ($this->extension == 'pgsql') {

			$result->setResult(pg_query($this->connection, $result->getSQL()));

			

		} elseif ($this->extension == 'sqlite') {

			$result->setResult(sqlite_query($this->connection, $result->getSQL(), SQLITE_ASSOC, $sqlite_error_message));

			

		} elseif ($this->extension == 'sqlsrv') {

			$resource = sqlsrv_query($this->connection, $result->getSQL());

			if (is_resource($resource)) {

				$rows = array();

				while ($row = sqlsrv_fetch_array($resource, SQLSRV_FETCH_ASSOC)) {

					$rows[] = $row;

				}

				$result->setResult($rows);

				unset($rows);

			} else {

				$result->setResult($resource);

			}

			

		} elseif ($this->extension == 'pdo') {

			if (preg_match('#^\s*CREATE(\s+OR\s+REPLACE)?\s+TRIGGER#i', $result->getSQL())) {

				$this->connection->exec($result->getSQL());

				$pdo_statement = FALSE;

				$returned_rows = array();

			} else {

				$pdo_statement = $this->connection->query($result->getSQL());

				$returned_rows = (is_object($pdo_statement)) ? $pdo_statement->fetchAll(PDO::FETCH_ASSOC) : $pdo_statement;

				

				// The pdo_pgsql driver likes to return empty rows equal to the number of affected rows for insert and deletes

				if ($this->type == 'postgresql' && $returned_rows && $returned_rows[0] == array()) {

					$returned_rows = array(); 		

				}

			}

			

			$result->setResult($returned_rows);

		}

		

		error_reporting($old_level);

		

		

		if ($this->extension == 'sqlite') {

			$this->checkForError($result, $sqlite_error_message);

		} elseif ($this->extension == 'oci8') {

			$this->checkForError($result, $oci_statement);

		} else {

			$this->checkForError($result);

		}

		

		

		if ($this->extension == 'pdo') {

			$this->setAffectedRows($result, $pdo_statement);

			if ($pdo_statement) {

				$pdo_statement->closeCursor();

			}

			unset($pdo_statement);

		} elseif ($this->extension == 'oci8') {

			$this->setAffectedRows($result, $oci_statement);

			oci_free_statement($oci_statement);

		} elseif ($this->extension == 'odbc') {

			$this->setAffectedRows($result, $resource);

			odbc_free_result($resource);

		} elseif ($this->extension == 'sqlsrv') {

			$this->setAffectedRows($result, $resource);

			sqlsrv_free_stmt($resource);

		} else {

			$this->setAffectedRows($result);

		}

		

		$this->setReturnedRows($result);

		

		$this->handleAutoIncrementedValue($result);

	}

	

	

	/**

	 * Executes an unbuffered SQL query

	 * 

	 * @param  fUnbufferedResult $result  The result object for the query

	 * @return void

	 */

	private function executeUnbufferedQuery($result)

	{

		$old_level = error_reporting(error_reporting() & ~E_WARNING);

		

		if ($this->extension == 'mssql') {

			$result->setResult(mssql_query($result->getSQL(), $this->connection, 20));

		} elseif ($this->extension == 'mysql') {

			$result->setResult(mysql_unbuffered_query($result->getSQL(), $this->connection));

		} elseif ($this->extension == 'mysqli') { 

			$result->setResult(mysqli_query($this->connection, $result->getSQL(), MYSQLI_USE_RESULT));

		} elseif ($this->extension == 'oci8') {

			$oci_statement = oci_parse($this->connection, $result->getSQL());

			$result->setResult(oci_execute($oci_statement, $this->inside_transaction ? OCI_DEFAULT : OCI_COMMIT_ON_SUCCESS) ? $oci_statement : FALSE);

		} elseif ($this->extension == 'odbc') {

			$result->setResult(odbc_exec($this->connection, $result->getSQL()));

		} elseif ($this->extension == 'pgsql') {

			$result->setResult(pg_query($this->connection, $result->getSQL()));

		} elseif ($this->extension == 'sqlite') {

			$result->setResult(sqlite_unbuffered_query($this->connection, $result->getSQL(), SQLITE_ASSOC, $sqlite_error_message));

		} elseif ($this->extension == 'sqlsrv') {

			$result->setResult(sqlsrv_query($this->connection, $result->getSQL()));

		} elseif ($this->extension == 'pdo') {

			$result->setResult($this->connection->query($result->getSQL()));

		}

		

		error_reporting($old_level);

		

		if ($this->extension == 'sqlite') {

			$this->checkForError($result, $sqlite_error_message);

		} elseif ($this->extension == 'oci8') {

			$this->checkForError($result, $oci_statement);

		} else {

			$this->checkForError($result);

		}

	}

	

	

	/**

	 * Takes in a string of SQL that contains multiple queries and returns any array of them

	 * 

	 * @param  string $sql  The string of SQL to parse for queries

	 * @return array  The individual SQL queries

	 */

	private function explodeQueries($sql)

	{

		$sql_queries = array();

		

		// Separate the SQL from quoted values

		preg_match_all("#(?:'([^']*(?:'')*)*?')|(?:[^']+)#", $sql, $matches);

		

		$cur_sql = '';

		foreach ($matches[0] as $match) {

			

			// This is a quoted string value, don't do anything to it

			if ($match[0] == "'") {

				$cur_sql .= $match;

			

			// Handle the SQL, exploding on any ; that isn't escaped with a \

			} else {

				$sql_strings = preg_split('#(?<!\\\\);#', $match);

				$cur_sql .= $sql_strings[0];

				for ($i=1; $i < sizeof($sql_strings); $i++) {

					$cur_sql = trim($cur_sql);

					if ($cur_sql) {

						$sql_queries[] = $cur_sql;

					}

					$cur_sql = $sql_strings[$i];

				}

			}

		}

		if (trim($cur_sql)) {

			$sql_queries[] = $cur_sql;

		}

		

		return $sql_queries;

	}

	

	

	/**

	 * Returns the database connection resource or object

	 * 

	 * @return mixed  The database connection

	 */

	public function getConnection()

	{

		$this->connectToDatabase();

		return $this->connection;

	}

	

	

	/**

	 * Gets the name of the database currently connected to

	 * 

	 * @return string  The name of the database currently connected to

	 */

	public function getDatabase()

	{

		return $this->database;

	}

	

	

	/**

	 * Gets the php extension being used

	 * 

	 * @internal

	 * 

	 * @return string  The php extension used for database interaction

	 */

	public function getExtension()

	{

		return $this->extension;

	}

	

	

	/**

	 * Gets the host for this database

	 * 

	 * @return string  The host

	 */

	public function getHost()

	{

		return $this->host;

	}

	

	

	/**

	 * Gets the port for this database

	 * 

	 * @return string  The port

	 */

	public function getPort()

	{

		return $this->port;

	}

	

	

	/**

	 * Gets the fSQLTranslation object used for translated queries

	 * 

	 * @return fSQLTranslation  The SQL translation object

	 */

	public function getSQLTranslation()

	{

		if (!$this->translation) { new fSQLTranslation($this); }

		return $this->translation;	

	}

	

	

	/**

	 * Gets the database type

	 * 

	 * @return string  The database type: `'mssql'`, `'mysql'`, `'postgresql'` or `'sqlite'`

	 */

	public function getType()

	{

		return $this->type;

	}

	

	

	/**

	 * Gets the username for this database

	 * 

	 * @return string  The username

	 */

	public function getUsername()

	{

		return $this->username;

	}

	

	

	/**

	 * Will grab the auto incremented value from the last query (if one exists)

	 * 

	 * @param  fResult $result  The result object for the query

	 * @return void

	 */

	private function handleAutoIncrementedValue($result)

	{

		if (!preg_match('#^\s*INSERT\s+INTO\s+(?:`|"|\[)?(\w+)(?:`|"|\])?#i', $result->getSQL(), $table_match)) {

			$result->setAutoIncrementedValue(NULL);

			return;

		}

		$table = strtolower($table_match[1]);

		

		$insert_id = NULL;

		

		if ($this->type == 'oracle') {

			if (!isset($this->schema_info['sequences'])) {

				$sql = "SELECT

								TABLE_NAME,

								TRIGGER_BODY

							FROM

								USER_TRIGGERS

							WHERE

								TRIGGERING_EVENT = 'INSERT' AND

								STATUS = 'ENABLED' AND

								TRIGGER_NAME NOT LIKE 'BIN\$%'";

								

				$this->schema_info['sequences'] = array();

				

				foreach ($this->query($sql) as $row) {

					if (preg_match('#SELECT\s+(\w+).nextval\s+INTO\s+:new\.(\w+)\s+FROM\s+dual#i', $row['trigger_body'], $matches)) {

						$this->schema_info['sequences'][strtolower($row['table_name'])] = array('sequence' => $matches[1], 'column' => $matches[2]);

					}

				}

				

				if ($this->cache) {

					$this->cache->set($this->makeCachePrefix() . 'schema_info', $this->schema_info);	

				}

			}

			

			if (!isset($this->schema_info['sequences'][$table]) || preg_match('#INSERT\s+INTO\s+' . preg_quote($table, '#') . '\s+\([^\)]*?\b' . preg_quote($this->schema_info['sequences'][$table]['column'], '#') . '\b#i', $result->getSQL())) {

				return;	

			}

			

			$insert_id_sql = "SELECT " . $this->schema_info['sequences'][$table]['sequence'] . ".currval AS INSERT_ID FROM dual";

		}

		

		if ($this->type == 'postgresql') {

			if (!isset($this->schema_info['sequences'])) {

				$sql = "SELECT

								pg_class.relname AS table_name,

								pg_attribute.attname AS column

							FROM

								pg_attribute INNER JOIN

								pg_class ON pg_attribute.attrelid = pg_class.oid INNER JOIN

								pg_attrdef ON pg_class.oid = pg_attrdef.adrelid AND pg_attribute.attnum = pg_attrdef.adnum

							WHERE

								NOT pg_attribute.attisdropped AND

								pg_attrdef.adsrc LIKE 'nextval(%'";

								

				$this->schema_info['sequences'] = array();

				

				foreach ($this->query($sql) as $row) {

					$this->schema_info['sequences'][strtolower($row['table_name'])] = $row['column'];

				}

				

				if ($this->cache) {

					$this->cache->set($this->makeCachePrefix() . 'schema_info', $this->schema_info);	

				}	

			}

			

			if (!isset($this->schema_info['sequences'][$table]) || preg_match('#INSERT\s+INTO\s+' . preg_quote($table, '#') . '\s+\([^\)]*?\b' . preg_quote($this->schema_info['sequences'][$table], '#') . '\b#i', $result->getSQL())) {

				return;

			} 		

		}

		

		if ($this->extension == 'mssql') {

			$insert_id_res = mssql_query("SELECT @@IDENTITY AS insert_id", $this->connection);

			$insert_id     = mssql_result($insert_id_res, 0, 'insert_id');

			mssql_free_result($insert_id_res);

		

		} elseif ($this->extension == 'mysql') {

			$insert_id     = mysql_insert_id($this->connection);

		

		} elseif ($this->extension == 'mysqli') {

			$insert_id     = mysqli_insert_id($this->connection);

		

		} elseif ($this->extension == 'oci8') {

			$oci_statement = oci_parse($this->connection, $insert_id_sql);

			oci_execute($oci_statement);

			$insert_id_row = oci_fetch_array($oci_statement, OCI_ASSOC);

			$insert_id = $insert_id_row['INSERT_ID'];

			oci_free_statement($oci_statement);

		

		} elseif ($this->extension == 'odbc' && $this->type == 'mssql') {

			$insert_id_res = odbc_exec($this->connection, "SELECT @@IDENTITY AS insert_id");

			$insert_id     = odbc_result($insert_id_res, 'insert_id');

			odbc_free_result($insert_id_res);

		

		} elseif ($this->extension == 'odbc' && $this->type == 'oracle') {

			$insert_id_res = odbc_exec($this->connection, $insert_id_sql);

			$insert_id     = odbc_resul…