/base/lib/flourishlib/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://ibm.com/db2 DB2]
 *  - [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:
 * 
 *  - DB2
 *   - [http://php.net/ibm_db2 ibm_db2]
 *   - [http://php.net/pdo_ibm pdo_ibm]
 *  - 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
 *   - [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)
 * 
 * The `odbc` and `pdo_odbc` extensions are not supported due to character
 * encoding and stability issues on Windows, and functionality on non-Windows
 * operating systems.
 * 
 * @copyright  Copyright (c) 2007-2011 Will Bond
 * @author     Will Bond [wb] <will@flourishlib.com>
 * @license    http://flourishlib.com/license
 * 
 * @package    Flourish
 * @link       http://flourishlib.com/fDatabase
 * 
 * @version    1.0.0b37
 * @changes    1.0.0b37  Fixed usage of the mysqli extension to only call mysqli_set_charset() if it exists [wb, 2011-03-04]
 * @changes    1.0.0b36  Updated ::escape() and methods that use ::escape() to handle float values that don't contain a digit before or after the . [wb, 2011-02-01]
 * @changes    1.0.0b35  Updated the class to replace `LIMIT` and `OFFSET` value placeholders in the SQL with their values before translating since most databases that translate `LIMIT` statements need to move or add values together [wb, 2011-01-11]
 * @changes    1.0.0b34  Fixed a bug with creating translated prepared statements [wb, 2011-01-09]
 * @changes    1.0.0b33  Added code to explicitly set the connection encoding for the mysql and mysqli extensions since some PHP installs don't see to fully respect `SET NAMES` [wb, 2010-12-06]
 * @changes    1.0.0b32  Fixed handling auto-incrementing values for Oracle when the trigger was on `INSERT OR UPDATE` instead of just `INSERT` [wb, 2010-12-04]
 * @changes    1.0.0b31  Fixed handling auto-incrementing values for MySQL when the `INTO` keyword is left out of an `INSERT` statement [wb, 2010-11-04]
 * @changes    1.0.0b30  Fixed the pgsql, mssql and mysql extensions to force a new connection instead of reusing an existing one [wb, 2010-08-17]
 * @changes    1.0.0b29  Backwards Compatibility Break - removed ::enableSlowQueryWarnings(), added ability to replicate via ::registerHookCallback() [wb, 2010-08-10]
 * @changes    1.0.0b28  Backwards Compatibility Break - removed ODBC support. Added support for the `pdo_ibm` extension. [wb, 2010-07-31]
 * @changes    1.0.0b27  Fixed a bug with running multiple copies of a SQL statement with string values through a single ::translatedQuery() call [wb, 2010-07-14]
 * @changes    1.0.0b26  Updated the class to use new fCore functionality [wb, 2010-07-05]
 * @changes    1.0.0b25  Added IBM DB2 support [wb, 2010-04-13]
 * @changes    1.0.0b24  Fixed an auto-incrementing transaction bug with Oracle and debugging issues with all databases [wb, 2010-03-17]
 * @changes    1.0.0b23  Resolved another bug with capturing auto-incrementing values for PostgreSQL and Oracle [wb, 2010-03-15]
 * @changes    1.0.0b22  Changed ::clearCache() to also clear the cache on the fSQLTranslation [wb, 2010-03-09]
 * @changes    1.0.0b21  Added ::execute() for result-less SQL queries, ::prepare() and ::translatedPrepare() to create fStatement objects for prepared statements, support for prepared statements in ::query() and ::unbufferedQuery(), fixed default caching key for ::enableCaching() [wb, 2010-03-02]
 * @changes    1.0.0b20  Added a parameter to ::enableCaching() to provide a key token that will allow cached values to be shared between multiple databases with the same schema [wb, 2009-10-28]
 * @changes    1.0.0b19  Added support for escaping identifiers (column and table names) to ::escape(), added support for database schemas, rewrote internal SQL string spliting [wb, 2009-10-22]
 * @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;
	
	/**
	 * The cache prefix to use for cache entries
	 * 
	 * @var string
	 */
	private $cache_prefix;
	
	/**
	 * 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;
	
	/**
	 * A temporary error holder for the mssql extension
	 * 
	 * @var string
	 */
	private $error;
	
	/**
	 * The extension to use for the database specified
	 * 
	 * Options include:
	 * 
	 *  - `'ibm_db2'`
	 *  - `'mssql'`
	 *  - `'mysql'`
	 *  - `'mysqli'`
	 *  - `'oci8'`
	 *  - `'pgsql'`
	 *  - `'sqlite'`
	 *  - `'sqlsrv'`
	 *  - `'pdo'`
	 * 
	 * @var string
	 */
	protected $extension;
	
	/**
	 * Hooks callbacks to be used for accessing and modifying queries
	 * 
	 * This array will have the structure:
	 * 
	 * {{{
	 * array(
	 *     'unmodified' => array({callbacks}),
	 *     'extracted'  => array({callbacks}),
	 *     'run'        => array({callbacks})
	 * )
	 * }}}
	 * 
	 * @var array
	 */
	private $hook_callbacks;
	
	/**
	 * 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 last executed fStatement object
	 * 
	 * @var fStatement
	 */
	private $statement;
	
	/**
	 * The fSQLTranslation object for this database
	 * 
	 * @var object
	 */
	private $translation;
	
	/**
	 * The database type: `'db2'`, `'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: `'db2'`, `'mssql'`, `'mysql'`, `'oracle'`, `'postgresql'`, `'sqlite'`
	 * @param  string  $database  Name of the database. 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. 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 $port      The port to connect to, defaults to the standard port for the database type specified - not used for SQLite
	 * @return fDatabase
	 */
	public function __construct($type, $database, $username=NULL, $password=NULL, $host=NULL, $port=NULL)
	{
		$valid_types = array('db2', 'mssql', 'mysql', 'oracle', 'postgresql', 'sqlite');
		if (!in_array($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->hook_callbacks = array(
			'unmodified' => array(),
			'extracted'  => array(),
			'run'        => array()
		);
		
		$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 == 'ibm_db2') {
			db2_close($this->connection);
		} elseif ($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 == '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|boolean $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
	 * @param  string                            $sql         The SQL that was executed
	 * @return void
	 */
	private function checkForError($result, $extra_info=NULL, $sql=NULL)
	{
		if ($result === FALSE || $result->getResult() === FALSE) {
			
			if ($this->extension == 'ibm_db2') {
				if (is_resource($extra_info)) {
					$message = db2_stmt_errormsg($extra_info);
				} else {
					$message = db2_stmt_errormsg();
				}
			} elseif ($this->extension == 'mssql') {
				$message = $this->error;
				unset($this->error);
			} elseif ($this->extension == 'mysql') {
				$message = mysql_error($this->connection);
			} elseif ($this->extension == 'mysqli') {
				if (is_object($extra_info)) {
					$message = $extra_info->error;	
				} else {
					$message = mysqli_error($this->connection);
				}
			} elseif ($this->extension == 'oci8') {
				$error_info = oci_error($extra_info);
				$message = $error_info['message'];
			} elseif ($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') {
				if ($extra_info instanceof PDOStatement) {
					$error_info = $extra_info->errorInfo();	
				} else {
					$error_info = $this->connection->errorInfo();
				}
				if (empty($error_info[2])) {
					$error_info[2] = 'Unknown error - this usually indicates a bug in the PDO driver';	
				}
				$message = $error_info[2];
			}
			
			$db_type_map = array(
				'db2'        => 'DB2',
				'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],
				$message,
				is_object($result) ? $result->getSQL() : $sql
			);
		}
	}
	
	
	/**
	 * 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') {
			$this->determineCharacterSet();		
		}
		if ($this->translation) {
			$this->translation->clearCache();	
		}
	}
	
	
	/**
	 * 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') {
			$username = $this->username;
			$password = $this->password;
			
			if ($this->type == 'db2') {
				if ($this->host === NULL && $this->port === NULL) {
					$dsn = 'ibm:DSN:' . $this->database;
				} else {
					$dsn  = 'ibm:DRIVER={IBM DB2 ODBC DRIVER};DATABASE=' . $this->database . ';HOSTNAME=' . $this->host . ';';
					$dsn .= 'PORT=' . ($this->port ? $this->port : 60000) . ';';
					$dsn .= 'PROTOCOL=TCPIP;UID=' . $username . ';PWD=' . $password . ';';
					$username = NULL;
					$password = NULL;
				}
				
			} elseif ($this->type == 'mssql') {
				$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') {
				$port = ($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, $username, $password);	
				if ($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 == 'ibm_db2') {
			$username = $this->username;
			$password = $this->password;
			if ($this->host === NULL && $this->port === NULL) {
				$connection_string = $this->database;
			} else {
				$connection_string  = 'DATABASE=' . $this->database . ';HOSTNAME=' . $this->host . ';';
				$connection_string .= 'PORT=' . ($this->port ? $this->port : 60000) . ';';
				$connection_string .= 'PROTOCOL=TCPIP;UID=' . $this->username . ';PWD=' . $this->password . ';';
				$username = NULL;
				$password = NULL;
			}
			$options = array(
				'autocommit'    => DB2_AUTOCOMMIT_ON,
				'DB2_ATTR_CASE' => DB2_CASE_LOWER
			);
			$this->connection = db2_connect($connection_string, $username, $password, $options);
		}
		
		if ($this->extension == 'mssql') {
			$separator        = (fCore::checkOS('windows')) ? ',' : ':';
			$this->connection = mssql_connect(($this->port) ? $this->host . $separator . $this->port : $this->host, $this->username, $this->password, TRUE);
			if ($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, $this->password, TRUE);
			if ($this->connection !== FALSE && mysql_select_db($this->database, $this->connection) === FALSE) {
				$this->connection = FALSE;
			}
			if ($this->connection && function_exists('mysql_set_charset') && !mysql_set_charset('utf8', $this->connection)) {
                throw new fConnectivityException(
                	'There was an error setting the database connection to use UTF-8'
				);
            }
		}
			
		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->connection && function_exists('mysqli_set_charset') && !mysqli_set_charset($this->connection, 'utf8')) {
                throw new fConnectivityException(
                	'There was an error setting the database connection to use UTF-8'
                );
            }
		}
		
		if ($this->extension == 'oci8') {
			$this->connection = oci_connect($this->username, $this->password, $this->host . ($this->port ? ':' . $this->port : '') . '/' . $this->database, 'AL32UTF8');
		}
			
		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, PGSQL_CONNECT_FORCE_NEW);
		}
		
		if ($this->extension == 'sqlsrv') {
			$options = array(
				'Database' => $this->database,
				'UID'      => $this->username,
				'PWD'      => $this->password
			);
			$this->connection = sqlsrv_connect($this->host . ',' . $this->port, $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->execute("SET SQL_MODE = 'REAL_AS_FLOAT,PIPES_AS_CONCAT,ANSI_QUOTES,IGNORE_SPACE'");
			$this->execute("SET NAMES 'utf8'");
			$this->execute("SET CHARACTER SET utf8");
		}
		
		// Make SQLite behave like other DBs for assoc arrays
		if ($this->type == 'sqlite') {
			$this->execute('PRAGMA short_column_names = 1');
		}
		
		// Fix some issues with mssql
		if ($this->type == 'mssql') {
			if (!isset($this->schema_info['character_set'])) {
				$this->determineCharacterSet();
			}
			$this->execute('SET TEXTSIZE 65536');
			$this->execute('SET QUOTED_IDENTIFIER ON');
		}
		
		// Make PostgreSQL use UTF-8
		if ($this->type == 'postgresql') {
			$this->execute("SET NAMES 'UTF8'");
		}
		
		// Oracle has different date and timestamp defaults
		if ($this->type == 'oracle') {
			$this->execute("ALTER SESSION SET NLS_DATE_FORMAT = 'YYYY-MM-DD'");
			$this->execute("ALTER SESSION SET NLS_TIMESTAMP_FORMAT = 'YYYY-MM-DD HH24:MI:SS'");
			$this->execute("ALTER SESSION SET NLS_TIMESTAMP_TZ_FORMAT = 'YYYY-MM-DD HH24:MI:SS TZR'");
			$this->execute("ALTER SESSION SET NLS_TIME_FORMAT = 'HH24:MI:SS'");
			$this->execute("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 'db2':
				
				if (extension_loaded('ibm_db2')) {
					$this->extension = 'ibm_db2';
					
				} elseif (class_exists('PDO', FALSE) && in_array('ibm', PDO::getAvailableDrivers())) {
					$this->extension = 'pdo';
					
				} else {
					$type = 'DB2';
					$exts = 'ibm_db2, pdo_ibm';
				}
				break;
			
			case 'mssql':
			
				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('mysqli')) {
					$this->extension = 'mysqli';
					
				} elseif (class_exists('PDO', FALSE) && in_array('mysql', PDO::getAvailableDrivers())) {
					$this->extension = 'pdo';
					
				} elseif (extension_loaded('mysql')) {
					$this->extension = 'mysql';
					
				} else {
					$type = 'MySQL';
					$exts = 'mysql, pdo_mysql, mysqli';
				}
				break;
				
				
			case 'oracle':
				
				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
	 * @param  string $key_token  Internal use only! (this will be used in the cache key to uniquely identify the cache for this fDatabase object) 
	 * @return void
	 */
	public function enableCaching($cache, $key_token=NULL)
	{
		$this->cache = $cache;
		
		if ($key_token !== NULL) {
			$this->cache_prefix = 'fDatabase::' . $this->type . '::' . $key_token . '::';	
		}
		
		$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;
	}
	
	
	/**
	 * Escapes a value for insertion into SQL
	 * 
	 * The valid data types are:
	 * 
	 *  - `'blob'`
	 *  - `'boolean'`
	 *  - `'date'`
	 *  - `'float'`
	 *  - `'identifier'`
	 *  - `'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
	 *  - `%r` for an indentifier (table or column name)
	 *  - `%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 'identifier':
			case '%r':
				$callback = $this->escapeIdentifier;
				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
		$parts = $this->splitSQL($sql_or_type);
		
		$temp_sql = '';
		$strings = array();
		
		// Replace strings with a placeholder so they don't mess up the regex parsing
		foreach ($parts as $part) {
			if ($part[0] == "'") {
				$strings[] = $part;
				$part = ':string_' . (sizeof($strings)-1);
			}
			$temp_sql .= $part;
		}
		
		// If the values were passed as a single array, this handles that
		$placeholders = preg_match_all('#%[lbdfristp]\b#', $temp_sql, $trash);
		if (count($values) == 0 && is_array($value) && count($value) == $placeholders) {
			$values = $value;
			$value  = array_shift($values);	
		}
		
		array_unshift($values, $value);
		
		$sql = $this->escapeSQL($temp_sql, $values);
		
		$string_number = 0;
		foreach ($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 ($this->type == 'db2') {
			return "BLOB(X'" . bin2hex($value) . "')";
			
		} elseif ($this->type == 'mysql') {
			return "x'" . bin2hex($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($this->type, array('mssql', 'sqlite', 'db2'))) {
			return ($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';
		}
		
		$value = rtrim($value, '.');
		$value = preg_replace('#(?<![0-9])\.#', '0.', $value);
		
		return (string) $value;
	}
	
	
	/**
	 * Escapes an identifier for use in SQL, necessary for reserved words
	 * 
	 * @param  string $value  The identifier to escape
	 * @return string  The escaped identifier
	 */
	private function escapeIdentifier($value)
	{
		$value = '"' . str_replace(
			array('"', '.'),
			array('',  '"."'),
			$value
		) . '"';
		if (in_array($this->type, array('oracle', 'db2'))) {
			$value = strtoupper($value);	
		}
		return $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]+)(\.[0-9]*)?$#D', $value, $matches)) {
			return 'NULL';
		}
		return str_replace('+', '', $matches[1]);
	}
	
	
	/**
	 * 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->type == 'db2') {
			return "'" . str_replace("'", "''", $value) . "'";
		} elseif ($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);
		}
	}
	
	
	/**
	 * Takes a SQL string and an array of values and replaces the placeholders with the value
	 * 
	 * @param string $sql     The SQL string containing placeholders
	 * @param array  $values  An array of values to escape into the SQL
	 * @return string  The SQL with the values escaped into it
	 */
	private function escapeSQL($sql, $values)
	{
		$original_sql = $sql;
		$pieces = preg_split('#(%[lbdfristp])\b#', $sql, -1, PREG_SPLIT_DELIM_CAPTURE|PREG_SPLIT_NO_EMPTY);
		
		$sql   = '';
		$value = array_shift($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 '%r':
					$callback = $this->escapeIdentifier;
					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,
				$original_sql
			);	
		}
		
		if (sizeof($values)) {
			throw new fProgrammerException(
				'%1$s extra value(s) were passed for the placeholders in: %2$s',
				sizeof($values),
				$original_sql
			); 	
		}	
		
		return $sql;
	}
	
	
	/**
	 * 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 one or more SQL queries without returning any results
	 * 
	 * @param  string|fStatement $statement  One or more SQL statements in a string or an fStatement prepared statement
	 * @param  mixed             $value      The optional value(s) to place into any placeholders in the SQL - see ::escape() for details
	 * @param  mixed             ...
	 * @return void
	 */
	public function execute($statement)
	{
		$args    = func_get_args();
		$params  = array_slice($args, 1);
		
		if (is_object($statement)) {
			return $this->run($statement, NULL, $params);	
		}
		
		$queries = $this->prepareSQL($statement, $params, FALSE);
		
		$output = array();
		foreach ($queries as $query) {
			$this->run($query);	
		}
	}
	
	
	/**
	 * 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
	 * @param  mixed   $resource  Only applicable for `pdo`, `oci8` and `sqlsrv` extentions or `mysqli` prepared statements - this is either the `PDOStatement` object, `mysqli_stmt` object or the `oci8` or `sqlsrv` resource
	 * @return void
	 */
	private function handleAutoIncrementedValue($result, $resource=NULL)
	{
		if (!preg_match('#^\s*INSERT\s+(?:INTO\s+)?(?:`|"|\[)?(["\w.]+)(?:`|"|\])?#i', $result->getSQL(), $table_match)) {
			$result->setAutoIncrementedValue(NULL);
			return;
		}
		$quoted_table = $table_match[1];
		$table        = str_replace('"', '', strtolower($table_match[1]));
		
		$insert_id = NULL;
		
		if ($this->type == 'oracle') {
			if (!isset($this->schema_info['sequences'])) {
				$sql = "SELECT
								LOWER(OWNER) AS \"SCHEMA\",
								LOWER(TABLE_NAME) AS \"TABLE\",
								TRIGGER_BODY
							FROM
								ALL_TRIGGERS
							WHERE
								TRIGGERING_EVENT LIKE 'INSERT%' AND
								STATUS = 'ENABLED' AND
								TRIGGER_NAME NOT LIKE 'BIN\$%' AND
								OWNER NOT IN (
									'SYS',
									'SYSTEM',
									'OUTLN',
									'ANONYMOUS',
									'AURORA\$ORB\$UNAUTHENTICATED',
									'AWR_STAGE',
									'CSMIG',
									'CTXSYS',
									'DBSNMP',
									'DIP',
									'DMSYS',
									'DSSYS',
									'EXFSYS',
									'FLOWS_020100',
									'FLOWS_FILES',
									'LBACSYS',
									'MDSYS',
									'ORACLE_OCM',
									'ORDPLUGINS',
									'ORDSYS',
									'PERFSTAT',
									'TRACESVR',
									'TSMSYS',
									'XDB'
								)";
								
				$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)) {
						$table_name = $row['table'];
						if ($row['schema'] != strtolower($this->username)) {
							$table_name = $row['schema'] . '.' . $table_name;	
						}
						$this->schema_info['sequences'][$table_name] = array('sequence' => $matches[1], 'column' => str_replace('"', '', $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($quoted_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_namespace.nspname AS \"schema\",
								pg_class.relname AS \"table\",
								pg_attribute.attname AS column
							FROM
								pg_attribute INNER JOIN
								pg_class ON pg_attribute.attrelid = pg_class.oid INNER JOIN
								pg_namespace ON pg_class.relnamespace = pg_namespace.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) {
					$table_name = strtolower($row['table']);
					if ($row['schema'] != 'public') {
						$table_name = $row['schema'] . '.' . $table_name;	
					}
					$this->schema_info['sequences'][$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($quoted_table, '#') . '"?\s+\([^\)]*?(\b|")' . preg_quote($this->schema_i…