system/database/DB_driver.php - code-igniter-v3-giggi - Gitiles

 <?php  if (!defined('BASEPATH')) exit('No direct script access allowed');
 /**
  * Code Igniter
  *
  * An open source application development framework for PHP 4.3.2 or newer
  *
  * @package		CodeIgniter
  * @author		Rick Ellis
  * @copyright	Copyright (c) 2006, pMachine, Inc.
  * @license		http://www.codeignitor.com/user_guide/license.html
  * @link		http://www.codeigniter.com
  * @since		Version 1.0
  * @filesource
  */

 // ------------------------------------------------------------------------

 /**
  * Database Driver Class
  *
  * This is the platform-independent base DB implementation class.
  * This class will not be called directly. Rather, the adapter
  * class for the specific database will extend and instantiate it.
  *
  * @package		CodeIgniter
  * @subpackage	Drivers
  * @category	Database
  * @author		Rick Ellis
  * @link		http://www.codeigniter.com/user_guide/database/
  */
 class CI_DB_driver {

 	var $username;
 	var $password;
 	var $hostname;
 	var $database;
 	var $dbdriver		= 'mysql';
 	var $dbprefix		= '';
 	var $port			= '';
 	var $pconnect		= FALSE;
 	var $conn_id		= FALSE;
 	var $result_id		= FALSE;
 	var $db_debug		= FALSE;
 	var $benchmark		= 0;
 	var $query_count	= 0;
 	var $bind_marker	= '?';
 	var $queries		= array();
 	var $trans_enabled	= TRUE;
 	var $_trans_depth	= 0;
 	var $_trans_failure	= FALSE; // Used with transactions to determine if a rollback should occur

     // These are use with Oracle
     var $stmt_id;
     var $curs_id;
     var $limit_used;


 	/**
 	 * Constructor.  Accepts one parameter containing the database
 	 * connection settings.
 	 *
 	 * Database settings can be passed as discreet
 	 * parameters or as a data source name in the first
 	 * parameter. DSNs must have this prototype:
 	 * $dsn = 'driver://username:password@hostname/database';
 	 *
 	 * @param mixed. Can be an array or a DSN string
 	 */
 	function CI_DB_driver($params)
 	{
 		$this->initialize($params);
 		log_message('debug', 'Database Driver Class Initialized');
 	}

 	// --------------------------------------------------------------------

 	/**
 	 * Initialize Database Settings
 	 *
 	 * @access	private Called by the constructor
 	 * @param	mixed
 	 * @return	void
 	 */
 	function initialize($params = '')
 	{
 		if (is_array($params))
 		{
 			foreach (array('hostname' => '', 'username' => '', 'password' => '', 'database' => '', 'dbdriver' => 'mysql', 'dbprefix' => '', 'port' => '', 'pconnect' => FALSE, 'db_debug' => FALSE) as $key => $val)
 			{
 				$this->$key = ( ! isset($params[$key])) ? $val : $params[$key];
 			}
 		}
 		elseif (strpos($params, '://'))
 		{
 			if (FALSE === ($dsn = @parse_url($params)))
 			{
 				log_message('error', 'Invalid DB Connection String');

 				if ($this->db_debug)
 				{
 					return $this->display_error('db_invalid_connection_str');
 				}
 				return FALSE;
 			}

 			$this->hostname = ( ! isset($dsn['host'])) ? '' : rawurldecode($dsn['host']);
 			$this->username = ( ! isset($dsn['user'])) ? '' : rawurldecode($dsn['user']);
 			$this->password = ( ! isset($dsn['pass'])) ? '' : rawurldecode($dsn['pass']);
 			$this->database = ( ! isset($dsn['path'])) ? '' : rawurldecode(substr($dsn['path'], 1));
 		}

 		if ($this->pconnect == FALSE)
 		{
 			$this->conn_id = $this->db_connect();
 		}
 		else
 		{
 			$this->conn_id = $this->db_pconnect();
 		}

         if ( ! $this->conn_id)
         {
 			log_message('error', 'Unable to connect to the database');

             if ($this->db_debug)
             {
 				$this->display_error('db_unable_to_connect');
             }
         }
 		else
 		{
 			if ( ! $this->db_select())
 			{
 				log_message('error', 'Unable to select database: '.$this->database);

 				if ($this->db_debug)
 				{
 					$this->display_error('db_unable_to_select', $this->database);
 				}
 			}
 		}
 	}


 	// --------------------------------------------------------------------

 	/**
 	 * The name of the platform in use (mysql, mssql, etc...)
 	 *
 	 * @access	public
 	 * @return	string
 	 */
 	function platform()
 	{
 		return $this->dbdriver;
 	}

 	// --------------------------------------------------------------------

 	/**
 	 * Database Version Number.  Returns a string containing the
 	 * version of the database being used
 	 *
 	 * @access	public
 	 * @return	string
 	 */
 	function version()
 	{
 		if (FALSE === ($sql = $this->_version()))
 		{
             if ($this->db_debug)
             {
 				return $this->display_error('db_unsupported_function');
             }
             return FALSE;
 		}

         if ($this->dbdriver == 'oci8')
         {
 			return $sql;
 		}

 		$query = $this->query($sql);
 		$row = $query->row();
 		return $row->ver;
 	}

 	// --------------------------------------------------------------------

 	/**
 	 * Execute the query
 	 *
 	 * Accepts an SQL string as input and returns a result object upon
 	 * successful execution of a "read" type query.  Returns boolean TRUE
 	 * upon successful execution of a "write" type query. Returns boolean
 	 * FALSE upon failure, and if the $db_debug variable is set to TRUE
 	 * will raise an error.
 	 *
 	 * @access	public
 	 * @param	string	An SQL query string
 	 * @param	array	An array of binding data
 	 * @return	mixed
 	 */
     function query($sql, $binds = FALSE, $return_object = TRUE)
     {
 		if ($sql == '')
 		{
             if ($this->db_debug)
             {
 				log_message('error', 'Invalid query: '.$sql);
 				return $this->display_error('db_invalid_query');
             }
             return FALSE;
 		}

 		// Compile binds if needed
 		if ($binds !== FALSE)
 		{
 			$sql = $this->compile_binds($sql, $binds);
 		}

         // Save the  query for debugging
         $this->queries[] = $sql;

 		// Start the Query Timer
         $time_start = list($sm, $ss) = explode(' ', microtime());

 		// Run the Query
         if (FALSE === ($this->result_id = $this->simple_query($sql)))
         {
         	// This will trigger a rollback if transactions are being used
         	$this->_trans_failure = TRUE;

             if ($this->db_debug)
             {
 				log_message('error', 'Query error: '.$this->_error_message());
 				return $this->display_error(
 										array(
 												'Error Number: '.$this->_error_number(),
 												$this->_error_message(),
 												$sql
 											)
 										);
             }

           return FALSE;
         }

 		// Stop and aggregate the query time results
 		$time_end = list($em, $es) = explode(' ', microtime());
 		$this->benchmark += ($em + $es) - ($sm + $ss);

 		// Increment the query counter
         $this->query_count++;

 		// Was the query a "write" type?
 		// If so we'll simply return true
 		if ($this->is_write_type($sql) === TRUE)
 		{
 			return TRUE;
 		}

 		// Return TRUE if we don't need to create a result object
 		// Currently only the Oracle driver uses this when stored
 		// procedures are used
 		if ($return_object !== TRUE)
 		{
 			return TRUE;
 		}

 		// Define the result driver name
 		$result = 'CI_DB_'.$this->dbdriver.'_result';

 		// Load the result classes
 		if ( ! class_exists($result))
 		{
 			include_once(BASEPATH.'database/DB_result'.EXT);
 			include_once(BASEPATH.'database/drivers/'.$this->dbdriver.'/'.$this->dbdriver.'_result'.EXT);
 		}

 		// Instantiate the result object
         $RES = new $result();
         $RES->conn_id	= $this->conn_id;
         $RES->db_debug	= $this->db_debug;
         $RES->result_id	= $this->result_id;

         if ($this->dbdriver == 'oci8')
         {
 			$RES->stmt_id   = $this->stmt_id;
 			$RES->curs_id   = NULL;
 			$RES->limit_used = $this->limit_used;
         }

 		return $RES;
 	}

 	// --------------------------------------------------------------------

 	/**
 	 * Simple Query
 	 * This is a simiplified version of the query() function.  Internally
 	 * we only use it when running transaction commands since they do
 	 * not require all the features of the main query() function.
 	 *
 	 * @access	public
 	 * @param	string	the sql query
 	 * @return	mixed
 	 */
 	function simple_query($sql)
 	{
 		if ( ! $this->conn_id)
 		{
 			$this->initialize();
 		}

 		return $this->_execute($sql, $this->conn_id);
 	}

 	// --------------------------------------------------------------------

 	/**
 	 * Disable Transactions
 	 * This permits transactions to be disabled at run-time.
 	 *
 	 * @access	public
 	 * @return	void
 	 */
 	function trans_off()
 	{
 		$this->trans_enabled = FALSE;
 	}

 	// --------------------------------------------------------------------

 	/**
 	 * Start Transaction
 	 *
 	 * @access	public
 	 * @return	void
 	 */
 	function trans_start($test_mode = FALSE)
 	{
 		if ( ! $this->trans_enabled)
 		{
 			return FALSE;
 		}

 		// When transactions are nested we only begin/commit/rollback the outermost ones
 		if ($this->_trans_depth > 0)
 		{
 			$this->_trans_depth += 1;
 			return;
 		}

 		$this->trans_begin($test_mode);
 	}

 	// --------------------------------------------------------------------

 	/**
 	 * Complete Transaction
 	 *
 	 * @access	public
 	 * @return	bool
 	 */
 	function trans_complete()
 	{
 		if ( ! $this->trans_enabled)
 		{
 			return FALSE;
 		}

 		// When transactions are nested we only begin/commit/rollback the outermost ones
 		if ($this->_trans_depth > 1)
 		{
 			$this->_trans_depth -= 1;
 			return TRUE;
 		}

 		// The query() function will set this flag to TRUE in the event that a query failed
 		if ($this->_trans_failure === TRUE)
 		{
 			$this->trans_rollback();

 			if ($this->db_debug)
 			{
 				return $this->display_error('db_transaction_failure');
 			}
 			return FALSE;
 		}

 		$this->trans_commit();
 		return TRUE;
 	}

 	// --------------------------------------------------------------------

 	/**
 	 * Lets you retrieve the transaction flag to determine if it has failed
 	 *
 	 * @access	public
 	 * @return	bool
 	 */
 	function trans_status()
 	{
 		return $this->_trans_failure;
 	}

 	// --------------------------------------------------------------------

 	/**
 	 * Compile Bindings
 	 *
 	 * @access	public
 	 * @param	string	the sql statement
 	 * @param	array	an array of bind data
 	 * @return	string
 	 */
 	function compile_binds($sql, $binds)
 	{
 		if (FALSE === strpos($sql, $this->bind_marker))
 		{
 			return $sql;
 		}

 		if ( ! is_array($binds))
 		{
 			$binds = array($binds);
 		}

 		foreach ($binds as $val)
 		{
 			$val = $this->escape($val);

 			// Just in case the replacement string contains the bind
 			// character we'll temporarily replace it with a marker
 			$val = str_replace($this->bind_marker, '{%bind_marker%}', $val);
 			$sql = preg_replace("#".preg_quote($this->bind_marker, '#')."#", str_replace('$', '\$', $val), $sql, 1);
 		}

 		return str_replace('{%bind_marker%}', $this->bind_marker, $sql);
 	}

 	// --------------------------------------------------------------------

 	/**
 	 * Determines if a query is a "write" type.
 	 *
 	 * @access	public
 	 * @param	string	An SQL query string
 	 * @return	boolean
 	 */
 	function is_write_type($sql)
 	{
 		if ( ! preg_match('/^\s*"?(INSERT|UPDATE|DELETE|REPLACE|CREATE|DROP|LOAD DATA|COPY|ALTER|GRANT|REVOKE|LOCK|UNLOCK)\s+/i', $sql))
 		{
 			return FALSE;
 		}
 		return TRUE;
 	}

 	// --------------------------------------------------------------------

 	/**
 	 * Calculate the aggregate query elapsed time
 	 *
 	 * @access	public
 	 * @param	intiger	The number of decimal places
 	 * @return	integer
 	 */
 	function elapsed_time($decimals = 6)
 	{
 		return number_format($this->benchmark, $decimals);
 	}

 	// --------------------------------------------------------------------

 	/**
 	 * Returns the total number of queries
 	 *
 	 * @access	public
 	 * @return	integer
 	 */
 	function total_queries()
 	{
 		return $this->query_count;
 	}

 	// --------------------------------------------------------------------

 	/**
 	 * Returns the last query that was executed
 	 *
 	 * @access	public
 	 * @return	void
 	 */
 	function last_query()
 	{
 		return end($this->queries);
 	}

 	// --------------------------------------------------------------------

 	/**
 	 * "Smart" Escape String
 	 *
 	 * Escapes data based on type
 	 * Sets boolean and null types
 	 *
 	 * @access	public
 	 * @param	string
 	 * @return	integer
 	 */
 	function escape($str)
 	{
 		switch (gettype($str))
 		{
 			case 'string'	:	$str = "'".$this->escape_str($str)."'";
 				break;
 			case 'boolean'	:	$str = ($str === FALSE) ? 0 : 1;
 				break;
 			default			:	$str = ($str === NULL) ? 'NULL' : $str;
 				break;
 		}

 		return $str;
 	}


 	// --------------------------------------------------------------------

 	/**
 	 * Primary
 	 *
 	 * Retrieves the primary key.  It assumes that the row in the first
 	 * position is the primary key
 	 *
 	 * @access	public
 	 * @param	string	the table name
 	 * @return	string
 	 */
 	function primary($table = '')
 	{
 		$fields = $this->field_names($table);

 		if ( ! is_array($fields))
 		{
 			return FALSE;
 		}

 		return current($fields);
 	}

 	// --------------------------------------------------------------------

 	/**
 	 * Fetch MySQL Field Names
 	 *
 	 * @access	public
 	 * @param	string	the table name
 	 * @return	array
 	 */
     function field_names($table = '')
     {
     	if ($table == '')
     	{
 			if ($this->db_debug)
 			{
 				return $this->display_error('db_field_param_missing');
 			}
 			return FALSE;
     	}

 		if (FALSE === ($sql = $this->_list_columns($this->dbprefix.$table)))
 		{
             if ($this->db_debug)
             {
 				return $this->display_error('db_unsupported_function');
             }
             return FALSE;
 		}

     	$query = $this->query($sql);

     	$retval = array();
 		foreach($query->result_array() as $row)
 		{
 			if (isset($row['COLUMN_NAME']))
 			{
 				$retval[] = $row['COLUMN_NAME'];
 			}
 			else
 			{
 				$retval[] = current($row);
 			}
 		}

     	return $retval;
     }

 	// --------------------------------------------------------------------

 	/**
 	 * Returns an object with field data
 	 *
 	 * @access	public
 	 * @param	string	the table name
 	 * @return	object
 	 */
 	function field_data($table = '')
 	{
     	if ($table == '')
     	{
 			if ($this->db_debug)
 			{
 				return $this->display_error('db_field_param_missing');
 			}
 			return FALSE;
     	}

 		$query = $this->query($this->_field_data($this->dbprefix.$table));
 		return $query->field_data();
 	}

 	// --------------------------------------------------------------------

 	/**
 	 * Generate an insert string
 	 *
 	 * @access	public
 	 * @param	string	the table upon which the query will be performed
 	 * @param	array	an associative array data of key/values
 	 * @return	string
 	 */
 	function insert_string($table, $data)
 	{
 		$fields = array();
 		$values = array();

 		foreach($data as $key => $val)
 		{
 			$fields[] = $key;
 			$values[] = $this->escape($val);
 		}

 		return $this->_insert($this->dbprefix.$table, $fields, $values);
 	}

 	// --------------------------------------------------------------------

 	/**
 	 * Generate an update string
 	 *
 	 * @access	public
 	 * @param	string	the table upon which the query will be performed
 	 * @param	array	an associative array data of key/values
 	 * @param	mixed	the "where" statement
 	 * @return	string
 	 */
 	function update_string($table, $data, $where)
 	{
 		if ($where == '')
 			return false;

 		$fields = array();
 		foreach($data as $key => $val)
 		{
 			$fields[$key] = $this->escape($val);
 		}

 		if ( ! is_array($where))
 		{
 			$dest = array($where);
 		}
 		else
 		{
 			$dest = array();
 			foreach ($where as $key => $val)
 			{
 				$prefix = (count($dest) == 0) ? '' : ' AND ';

 				if ($val != '')
 				{
 					if ( ! $this->_has_operator($key))
 					{
 						$key .= ' =';
 					}

 					$val = ' '.$this->escape($val);
 				}

 				$dest[] = $prefix.$key.$val;
 			}
 		}

 		return $this->_update($this->dbprefix.$table, $fields, $dest);
 	}

 	// --------------------------------------------------------------------

 	/**
 	 * Enables a native PHP function to be run, using a platform agnostic wrapper.
 	 *
 	 * @access	public
 	 * @param	string	the function name
 	 * @param	mixed	any parameters needed by the function
 	 * @return	mixed
 	 */
 	function call_function($function)
 	{
 		$driver = ($this->dbdriver == 'postgre') ? 'pg_' : $this->dbdriver.'_';

 		if (FALSE === strpos($driver, $function))
 		{
 			$function = $driver.$function;
 		}

 		if ( ! function_exists($function))
 		{
 			if ($this->db_debug)
 			{
 				return $this->display_error('db_unsupported_function');
 			}
 			return FALSE;
 		}
 		else
 		{
 			$args = (func_num_args() > 1) ? array_shift(func_get_args()) : null;

 			return call_user_func_array($function, $args);
 		}
 	}

 	// --------------------------------------------------------------------

 	/**
 	 * Close DB Connection
 	 *
 	 * @access	public
 	 * @return	void
 	 */
     function close()
     {
         if (is_resource($this->conn_id))
         {
             $this->_close($this->conn_id);
 		}
 		$this->conn_id = FALSE;
     }

 	// --------------------------------------------------------------------

 	/**
 	 * Display an error message
 	 *
 	 * @access	public
 	 * @param	string	the error message
 	 * @param	string	any "swap" values
 	 * @param	boolean	whether to localize the message
 	 * @return	string	sends the application/errror_db.php template
 	 */
     function display_error($error = '', $swap = '', $native = FALSE)
     {
 		$LANG = new CI_Language();
 		$LANG->load('db');

 		$heading = 'MySQL Error';

 		if ($native == TRUE)
 		{
 			$message = $error;
 		}
 		else
 		{
 			$message = ( ! is_array($error)) ? array(str_replace('%s', $swap, $LANG->line($error))) : $error;
 		}

 		if ( ! class_exists('CI_Exceptions'))
 		{
 			include_once(BASEPATH.'libraries/Exceptions'.EXT);
 		}

 		$error = new CI_Exceptions();
 		echo $error->show_error('An Error Was Encountered', $message, 'error_db');
 		exit;

     }

 }

 ?>
	<?php if (!defined('BASEPATH')) exit('No direct script access allowed');
	/**
	* Code Igniter
	*
	* An open source application development framework for PHP 4.3.2 or newer
	*
	* @package CodeIgniter
	* @author Rick Ellis
	* @copyright Copyright (c) 2006, pMachine, Inc.
	* @license http://www.codeignitor.com/user_guide/license.html
	* @link http://www.codeigniter.com
	* @since Version 1.0
	* @filesource
	*/

	// ------------------------------------------------------------------------

	/**
	* Database Driver Class
	*
	* This is the platform-independent base DB implementation class.
	* This class will not be called directly. Rather, the adapter
	* class for the specific database will extend and instantiate it.
	*
	* @package CodeIgniter
	* @subpackage Drivers
	* @category Database
	* @author Rick Ellis
	* @link http://www.codeigniter.com/user_guide/database/
	*/
	class CI_DB_driver {

	var $username;
	var $password;
	var $hostname;
	var $database;
	var $dbdriver = 'mysql';
	var $dbprefix = '';
	var $port = '';
	var $pconnect = FALSE;
	var $conn_id = FALSE;
	var $result_id = FALSE;
	var $db_debug = FALSE;
	var $benchmark = 0;
	var $query_count = 0;
	var $bind_marker = '?';
	var $queries = array();
	var $trans_enabled = TRUE;
	var $_trans_depth = 0;
	var $_trans_failure = FALSE; // Used with transactions to determine if a rollback should occur

	// These are use with Oracle
	var $stmt_id;
	var $curs_id;
	var $limit_used;


	/**
	* Constructor. Accepts one parameter containing the database
	* connection settings.
	*
	* Database settings can be passed as discreet
	* parameters or as a data source name in the first
	* parameter. DSNs must have this prototype:
	* $dsn = 'driver://username:password@hostname/database';
	*
	* @param mixed. Can be an array or a DSN string
	*/
	function CI_DB_driver($params)
	{
	$this->initialize($params);
	log_message('debug', 'Database Driver Class Initialized');
	}

	// --------------------------------------------------------------------

	/**
	* Initialize Database Settings
	*
	* @access private Called by the constructor
	* @param mixed
	* @return void
	*/
	function initialize($params = '')
	{
	if (is_array($params))
	{
	foreach (array('hostname' => '', 'username' => '', 'password' => '', 'database' => '', 'dbdriver' => 'mysql', 'dbprefix' => '', 'port' => '', 'pconnect' => FALSE, 'db_debug' => FALSE) as $key => $val)
	{
	$this->$key = ( ! isset($params[$key])) ? $val : $params[$key];
	}
	}
	elseif (strpos($params, '://'))
	{
	if (FALSE === ($dsn = @parse_url($params)))
	{
	log_message('error', 'Invalid DB Connection String');

	if ($this->db_debug)
	{
	return $this->display_error('db_invalid_connection_str');
	}
	return FALSE;
	}

	$this->hostname = ( ! isset($dsn['host'])) ? '' : rawurldecode($dsn['host']);
	$this->username = ( ! isset($dsn['user'])) ? '' : rawurldecode($dsn['user']);
	$this->password = ( ! isset($dsn['pass'])) ? '' : rawurldecode($dsn['pass']);
	$this->database = ( ! isset($dsn['path'])) ? '' : rawurldecode(substr($dsn['path'], 1));
	}

	if ($this->pconnect == FALSE)
	{
	$this->conn_id = $this->db_connect();
	}
	else
	{
	$this->conn_id = $this->db_pconnect();
	}

	if ( ! $this->conn_id)
	{
	log_message('error', 'Unable to connect to the database');

	if ($this->db_debug)
	{
	$this->display_error('db_unable_to_connect');
	}
	}
	else
	{
	if ( ! $this->db_select())
	{
	log_message('error', 'Unable to select database: '.$this->database);

	if ($this->db_debug)
	{
	$this->display_error('db_unable_to_select', $this->database);
	}
	}
	}
	}


	// --------------------------------------------------------------------

	/**
	* The name of the platform in use (mysql, mssql, etc...)
	*
	* @access public
	* @return string
	*/
	function platform()
	{
	return $this->dbdriver;
	}

	// --------------------------------------------------------------------

	/**
	* Database Version Number. Returns a string containing the
	* version of the database being used
	*
	* @access public
	* @return string
	*/
	function version()
	{
	if (FALSE === ($sql = $this->_version()))
	{
	if ($this->db_debug)
	{
	return $this->display_error('db_unsupported_function');
	}
	return FALSE;
	}

	if ($this->dbdriver == 'oci8')
	{
	return $sql;
	}

	$query = $this->query($sql);
	$row = $query->row();
	return $row->ver;
	}

	// --------------------------------------------------------------------

	/**
	* Execute the query
	*
	* Accepts an SQL string as input and returns a result object upon
	* successful execution of a "read" type query. Returns boolean TRUE
	* upon successful execution of a "write" type query. Returns boolean
	* FALSE upon failure, and if the $db_debug variable is set to TRUE
	* will raise an error.
	*
	* @access public
	* @param string An SQL query string
	* @param array An array of binding data
	* @return mixed
	*/
	function query($sql, $binds = FALSE, $return_object = TRUE)
	{
	if ($sql == '')
	{
	if ($this->db_debug)
	{
	log_message('error', 'Invalid query: '.$sql);
	return $this->display_error('db_invalid_query');
	}
	return FALSE;
	}

	// Compile binds if needed
	if ($binds !== FALSE)
	{
	$sql = $this->compile_binds($sql, $binds);
	}

	// Save the query for debugging
	$this->queries[] = $sql;

	// Start the Query Timer
	$time_start = list($sm, $ss) = explode(' ', microtime());

	// Run the Query
	if (FALSE === ($this->result_id = $this->simple_query($sql)))
	{
	// This will trigger a rollback if transactions are being used
	$this->_trans_failure = TRUE;

	if ($this->db_debug)
	{
	log_message('error', 'Query error: '.$this->_error_message());
	return $this->display_error(
	array(
	'Error Number: '.$this->_error_number(),
	$this->_error_message(),
	$sql
	)
	);
	}

	return FALSE;
	}

	// Stop and aggregate the query time results
	$time_end = list($em, $es) = explode(' ', microtime());
	$this->benchmark += ($em + $es) - ($sm + $ss);

	// Increment the query counter
	$this->query_count++;

	// Was the query a "write" type?
	// If so we'll simply return true
	if ($this->is_write_type($sql) === TRUE)
	{
	return TRUE;
	}

	// Return TRUE if we don't need to create a result object
	// Currently only the Oracle driver uses this when stored
	// procedures are used
	if ($return_object !== TRUE)
	{
	return TRUE;
	}

	// Define the result driver name
	$result = 'CI_DB_'.$this->dbdriver.'_result';

	// Load the result classes
	if ( ! class_exists($result))
	{
	include_once(BASEPATH.'database/DB_result'.EXT);
	include_once(BASEPATH.'database/drivers/'.$this->dbdriver.'/'.$this->dbdriver.'_result'.EXT);
	}

	// Instantiate the result object
	$RES = new $result();
	$RES->conn_id = $this->conn_id;
	$RES->db_debug = $this->db_debug;
	$RES->result_id = $this->result_id;

	if ($this->dbdriver == 'oci8')
	{
	$RES->stmt_id = $this->stmt_id;
	$RES->curs_id = NULL;
	$RES->limit_used = $this->limit_used;
	}

	return $RES;
	}

	// --------------------------------------------------------------------

	/**
	* Simple Query
	* This is a simiplified version of the query() function. Internally
	* we only use it when running transaction commands since they do
	* not require all the features of the main query() function.
	*
	* @access public
	* @param string the sql query
	* @return mixed
	*/
	function simple_query($sql)
	{
	if ( ! $this->conn_id)
	{
	$this->initialize();
	}

	return $this->_execute($sql, $this->conn_id);
	}

	// --------------------------------------------------------------------

	/**
	* Disable Transactions
	* This permits transactions to be disabled at run-time.
	*
	* @access public
	* @return void
	*/
	function trans_off()
	{
	$this->trans_enabled = FALSE;
	}

	// --------------------------------------------------------------------

	/**
	* Start Transaction
	*
	* @access public
	* @return void
	*/
	function trans_start($test_mode = FALSE)
	{
	if ( ! $this->trans_enabled)
	{
	return FALSE;
	}

	// When transactions are nested we only begin/commit/rollback the outermost ones
	if ($this->_trans_depth > 0)
	{
	$this->_trans_depth += 1;
	return;
	}

	$this->trans_begin($test_mode);
	}

	// --------------------------------------------------------------------

	/**
	* Complete Transaction
	*
	* @access public
	* @return bool
	*/
	function trans_complete()
	{
	if ( ! $this->trans_enabled)
	{
	return FALSE;
	}

	// When transactions are nested we only begin/commit/rollback the outermost ones
	if ($this->_trans_depth > 1)
	{
	$this->_trans_depth -= 1;
	return TRUE;
	}

	// The query() function will set this flag to TRUE in the event that a query failed
	if ($this->_trans_failure === TRUE)
	{
	$this->trans_rollback();

	if ($this->db_debug)
	{
	return $this->display_error('db_transaction_failure');
	}
	return FALSE;
	}

	$this->trans_commit();
	return TRUE;
	}

	// --------------------------------------------------------------------

	/**
	* Lets you retrieve the transaction flag to determine if it has failed
	*
	* @access public
	* @return bool
	*/
	function trans_status()
	{
	return $this->_trans_failure;
	}

	// --------------------------------------------------------------------

	/**
	* Compile Bindings
	*
	* @access public
	* @param string the sql statement
	* @param array an array of bind data
	* @return string
	*/
	function compile_binds($sql, $binds)
	{
	if (FALSE === strpos($sql, $this->bind_marker))
	{
	return $sql;
	}

	if ( ! is_array($binds))
	{
	$binds = array($binds);
	}

	foreach ($binds as $val)
	{
	$val = $this->escape($val);

	// Just in case the replacement string contains the bind
	// character we'll temporarily replace it with a marker
	$val = str_replace($this->bind_marker, '{%bind_marker%}', $val);
	$sql = preg_replace("#".preg_quote($this->bind_marker, '#')."#", str_replace('$', '\$', $val), $sql, 1);
	}

	return str_replace('{%bind_marker%}', $this->bind_marker, $sql);
	}

	// --------------------------------------------------------------------

	/**
	* Determines if a query is a "write" type.
	*
	* @access public
	* @param string An SQL query string
	* @return boolean
	*/
	function is_write_type($sql)
	{
	if ( ! preg_match('/^\s*"?(INSERT\|UPDATE\|DELETE\|REPLACE\|CREATE\|DROP\|LOAD DATA\|COPY\|ALTER\|GRANT\|REVOKE\|LOCK\|UNLOCK)\s+/i', $sql))
	{
	return FALSE;
	}
	return TRUE;
	}

	// --------------------------------------------------------------------

	/**
	* Calculate the aggregate query elapsed time
	*
	* @access public
	* @param intiger The number of decimal places
	* @return integer
	*/
	function elapsed_time($decimals = 6)
	{
	return number_format($this->benchmark, $decimals);
	}

	// --------------------------------------------------------------------

	/**
	* Returns the total number of queries
	*
	* @access public
	* @return integer
	*/
	function total_queries()
	{
	return $this->query_count;
	}

	// --------------------------------------------------------------------

	/**
	* Returns the last query that was executed
	*
	* @access public
	* @return void
	*/
	function last_query()
	{
	return end($this->queries);
	}

	// --------------------------------------------------------------------

	/**
	* "Smart" Escape String
	*
	* Escapes data based on type
	* Sets boolean and null types
	*
	* @access public
	* @param string
	* @return integer
	*/
	function escape($str)
	{
	switch (gettype($str))
	{
	case 'string' : $str = "'".$this->escape_str($str)."'";
	break;
	case 'boolean' : $str = ($str === FALSE) ? 0 : 1;
	break;
	default : $str = ($str === NULL) ? 'NULL' : $str;
	break;
	}

	return $str;
	}



	// --------------------------------------------------------------------

	/**
	* Primary
	*
	* Retrieves the primary key. It assumes that the row in the first
	* position is the primary key
	*
	* @access public
	* @param string the table name
	* @return string
	*/
	function primary($table = '')
	{
	$fields = $this->field_names($table);

	if ( ! is_array($fields))
	{
	return FALSE;
	}

	return current($fields);
	}

	// --------------------------------------------------------------------

	/**
	* Fetch MySQL Field Names
	*
	* @access public
	* @param string the table name
	* @return array
	*/
	function field_names($table = '')
	{
	if ($table == '')
	{
	if ($this->db_debug)
	{
	return $this->display_error('db_field_param_missing');
	}
	return FALSE;
	}

	if (FALSE === ($sql = $this->_list_columns($this->dbprefix.$table)))
	{
	if ($this->db_debug)
	{
	return $this->display_error('db_unsupported_function');
	}
	return FALSE;
	}

	$query = $this->query($sql);

	$retval = array();
	foreach($query->result_array() as $row)
	{
	if (isset($row['COLUMN_NAME']))
	{
	$retval[] = $row['COLUMN_NAME'];
	}
	else
	{
	$retval[] = current($row);
	}
	}

	return $retval;
	}

	// --------------------------------------------------------------------

	/**
	* Returns an object with field data
	*
	* @access public
	* @param string the table name
	* @return object
	*/
	function field_data($table = '')
	{
	if ($table == '')
	{
	if ($this->db_debug)
	{
	return $this->display_error('db_field_param_missing');
	}
	return FALSE;
	}

	$query = $this->query($this->_field_data($this->dbprefix.$table));
	return $query->field_data();
	}

	// --------------------------------------------------------------------

	/**
	* Generate an insert string
	*
	* @access public
	* @param string the table upon which the query will be performed
	* @param array an associative array data of key/values
	* @return string
	*/
	function insert_string($table, $data)
	{
	$fields = array();
	$values = array();

	foreach($data as $key => $val)
	{
	$fields[] = $key;
	$values[] = $this->escape($val);
	}

	return $this->_insert($this->dbprefix.$table, $fields, $values);
	}

	// --------------------------------------------------------------------

	/**
	* Generate an update string
	*
	* @access public
	* @param string the table upon which the query will be performed
	* @param array an associative array data of key/values
	* @param mixed the "where" statement
	* @return string
	*/
	function update_string($table, $data, $where)
	{
	if ($where == '')
	return false;

	$fields = array();
	foreach($data as $key => $val)
	{
	$fields[$key] = $this->escape($val);
	}

	if ( ! is_array($where))
	{
	$dest = array($where);
	}
	else
	{
	$dest = array();
	foreach ($where as $key => $val)
	{
	$prefix = (count($dest) == 0) ? '' : ' AND ';

	if ($val != '')
	{
	if ( ! $this->_has_operator($key))
	{
	$key .= ' =';
	}

	$val = ' '.$this->escape($val);
	}

	$dest[] = $prefix.$key.$val;
	}
	}

	return $this->_update($this->dbprefix.$table, $fields, $dest);
	}

	// --------------------------------------------------------------------

	/**
	* Enables a native PHP function to be run, using a platform agnostic wrapper.
	*
	* @access public
	* @param string the function name
	* @param mixed any parameters needed by the function
	* @return mixed
	*/
	function call_function($function)
	{
	$driver = ($this->dbdriver == 'postgre') ? 'pg_' : $this->dbdriver.'_';

	if (FALSE === strpos($driver, $function))
	{
	$function = $driver.$function;
	}

	if ( ! function_exists($function))
	{
	if ($this->db_debug)
	{
	return $this->display_error('db_unsupported_function');
	}
	return FALSE;
	}
	else
	{
	$args = (func_num_args() > 1) ? array_shift(func_get_args()) : null;

	return call_user_func_array($function, $args);
	}
	}

	// --------------------------------------------------------------------

	/**
	* Close DB Connection
	*
	* @access public
	* @return void
	*/
	function close()
	{
	if (is_resource($this->conn_id))
	{
	$this->_close($this->conn_id);
	}
	$this->conn_id = FALSE;
	}

	// --------------------------------------------------------------------

	/**
	* Display an error message
	*
	* @access public
	* @param string the error message
	* @param string any "swap" values
	* @param boolean whether to localize the message
	* @return string sends the application/errror_db.php template
	*/
	function display_error($error = '', $swap = '', $native = FALSE)
	{
	$LANG = new CI_Language();
	$LANG->load('db');

	$heading = 'MySQL Error';

	if ($native == TRUE)
	{
	$message = $error;
	}
	else
	{
	$message = ( ! is_array($error)) ? array(str_replace('%s', $swap, $LANG->line($error))) : $error;
	}

	if ( ! class_exists('CI_Exceptions'))
	{
	include_once(BASEPATH.'libraries/Exceptions'.EXT);
	}

	$error = new CI_Exceptions();
	echo $error->show_error('An Error Was Encountered', $message, 'error_db');
	exit;

	}

	}

	?>