system/database/drivers/interbase/interbase_driver.php - code-igniter-v3-giggi - Gitiles

 <?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
 /**
  * CodeIgniter
  *
  * An open source application development framework for PHP 5.2.4 or newer
  *
  * NOTICE OF LICENSE
  *
  * Licensed under the Open Software License version 3.0
  *
  * This source file is subject to the Open Software License (OSL 3.0) that is
  * bundled with this package in the files license.txt / license.rst.  It is
  * also available through the world wide web at this URL:
  * http://opensource.org/licenses/OSL-3.0
  * If you did not receive a copy of the license and are unable to obtain it
  * through the world wide web, please send an email to
  * licensing@ellislab.com so we can send you a copy immediately.
  *
  * @package		CodeIgniter
  * @author		EllisLab Dev Team
  * @copyright	Copyright (c) 2008 - 2012, EllisLab, Inc. (http://ellislab.com/)
  * @license		http://opensource.org/licenses/OSL-3.0 Open Software License (OSL 3.0)
  * @link		http://codeigniter.com
  * @since		Version 3.0
  * @filesource
  */

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

 /**
  * Firebird/Interbase Database Adapter Class
  *
  * Note: _DB is an extender class that the app controller
  * creates dynamically based on whether the active record
  * class is being used or not.
  *
  * @package		CodeIgniter
  * @subpackage	Drivers
  * @category	Database
  * @author		EllisLab Dev Team
  * @link		http://codeigniter.com/user_guide/database/
  */
 class CI_DB_interbase_driver extends CI_DB {

 	public $dbdriver = 'interbase';

 	// The character used to escape with
 	protected $_escape_char = '"';

 	// clause and character used for LIKE escape sequences
 	protected $_like_escape_str = " ESCAPE '%s' ";
 	protected $_like_escape_chr = '!';

 	/**
 	 * The syntax to count rows is slightly different across different
 	 * database engines, so this string appears in each driver and is
 	 * used for the count_all() and count_all_results() functions.
 	 */
 	protected $_count_string = "SELECT COUNT(*) AS ";
 	protected $_random_keyword = ' Random()'; // database specific random keyword

 	// Keeps track of the resource for the current transaction
 	protected $trans;

 	/**
 	 * Non-persistent database connection
 	 *
 	 * @return	resource
 	 */
 	public function db_connect()
 	{
 		return @ibase_connect($this->hostname.':'.$this->database, $this->username, $this->password, $this->char_set);
 	}

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

 	/**
 	 * Persistent database connection
 	 *
 	 * @return	resource
 	 */
 	public function db_pconnect()
 	{
 		return @ibase_pconnect($this->hostname.':'.$this->database, $this->username, $this->password, $this->char_set);
 	}

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

 	/**
 	 * Reconnect
 	 *
 	 * Keep / reestablish the db connection if no queries have been
 	 * sent for a length of time exceeding the server's idle timeout
 	 *
 	 * @return	void
 	 */
 	public function reconnect()
 	{
 		// not implemented in Interbase/Firebird
 	}

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

 	/**
 	 * Select the database
 	 *
 	 * @return	bool
 	 */
 	public function db_select()
 	{
 		// Connection selects the database
 		return TRUE;
 	}

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

 	/**
 	 * Database version number
 	 *
 	 * @return	string
 	 */
 	public function version()
 	{
 		if (isset($this->data_cache['version']))
 		{
 			return $this->data_cache['version'];
 		}

 		if (($service = ibase_service_attach($this->hostname, $this->username, $this->password)))
 		{
 			$this->data_cache['version'] = ibase_server_info($service, IBASE_SVC_SERVER_VERSION);

 			// Don't keep the service open
 			ibase_service_detach($service);
 			return $this->data_cache['version'];
 		}

 		return FALSE;
 	}

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

 	/**
 	 * Execute the query
 	 *
 	 * @param	string	an SQL query
 	 * @return	resource
 	 */
 	protected function _execute($sql)
 	{
 		return @ibase_query($this->conn_id, $sql);
 	}

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

 	/**
 	 * Begin Transaction
 	 *
 	 * @return	bool
 	 */
 	public function trans_begin($test_mode = FALSE)
 	{
 		if ( ! $this->trans_enabled)
 		{
 			return TRUE;
 		}

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

 		// Reset the transaction failure flag.
 		// If the $test_mode flag is set to TRUE transactions will be rolled back
 		// even if the queries produce a successful result.
 		$this->_trans_failure = ($test_mode === TRUE) ? TRUE : FALSE;

 		$this->trans = @ibase_trans($this->conn_id);

 		return TRUE;
 	}

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

 	/**
 	 * Commit Transaction
 	 *
 	 * @return	bool
 	 */
 	public function trans_commit()
 	{
 		if ( ! $this->trans_enabled)
 		{
 			return TRUE;
 		}

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

 		return @ibase_commit($this->trans);
 	}

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

 	/**
 	 * Rollback Transaction
 	 *
 	 * @return	bool
 	 */
 	public function trans_rollback()
 	{
 		if ( ! $this->trans_enabled)
 		{
 			return TRUE;
 		}

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

 		return @ibase_rollback($this->trans);
 	}

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

 	/**
 	 * Escape String
 	 *
 	 * @param	string
 	 * @param	bool	whether or not the string will be used in a LIKE condition
 	 * @return	string
 	 */
 	public function escape_str($str, $like = FALSE)
 	{
 		if (is_array($str))
 		{
 			foreach ($str as $key => $val)
 			{
 				$str[$key] = $this->escape_str($val, $like);
 			}

 			return $str;
 		}

 		// escape LIKE condition wildcards
 		if ($like === TRUE)
 		{
 			$str = str_replace(	array('%', '_', $this->_like_escape_chr),
 								array($this->_like_escape_chr.'%', $this->_like_escape_chr.'_', $this->_like_escape_chr.$this->_like_escape_chr),
 								$str);
 		}

 		return $str;
 	}

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

 	/**
 	 * Affected Rows
 	 *
 	 * @return	integer
 	 */
 	public function affected_rows()
 	{
 		return @ibase_affected_rows($this->conn_id);
 	}

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

 	/**
 	 * Insert ID
 	 *
 	 * @param	string $generator_name
 	 * @param	integer $inc_by
 	 * @return	integer
 	 */
 	public function insert_id($generator_name, $inc_by=0)
 	{
 		//If a generator hasn't been used before it will return 0
 		return ibase_gen_id('"'.$generator_name.'"', $inc_by);
 	}

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

 	/**
 	 * "Count All" query
 	 *
 	 * Generates a platform-specific query string that counts all records in
 	 * the specified database
 	 *
 	 * @param	string
 	 * @return	string
 	 */
 	public function count_all($table = '')
 	{
 		if ($table == '')
 		{
 			return 0;
 		}

 		$query = $this->query($this->_count_string.$this->protect_identifiers('numrows').' FROM '.$this->protect_identifiers($table, TRUE, NULL, FALSE));
 		if ($query->num_rows() == 0)
 		{
 			return 0;
 		}

 		$row = $query->row();
 		$this->_reset_select();
 		return (int) $row->numrows;
 	}

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

 	/**
 	 * List table query
 	 *
 	 * Generates a platform-specific query string so that the table names can be fetched
 	 *
 	 * @param	boolean
 	 * @return	string
 	 */
 	protected function _list_tables($prefix_limit = FALSE)
 	{
 		$sql = <<<SQL
 			SELECT "RDB\$RELATION_NAME" FROM "RDB\$RELATIONS"
 			WHERE "RDB\$RELATION_NAME" NOT LIKE 'RDB$%'
 			AND "RDB\$RELATION_NAME" NOT LIKE 'MON$%'
 SQL;

 		if ($prefix_limit !== FALSE AND $this->dbprefix != '')
 		{
 			$sql .= ' AND "RDB$RELATION_NAME" LIKE \''.$this->escape_like_str($this->dbprefix)."%' ".sprintf($this->_like_escape_str, $this->_like_escape_chr);
 		}
 		return $sql;
 	}

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

 	/**
 	 * Show column query
 	 *
 	 * Generates a platform-specific query string so that the column names can be fetched
 	 *
 	 * @param	string	the table name
 	 * @return	string
 	 */
 	protected function _list_columns($table = '')
 	{
 		return <<<SQL
 			SELECT "RDB\$FIELD_NAME" FROM "RDB\$RELATION_FIELDS"
 			WHERE "RDB\$RELATION_NAME"='{$table}';
 SQL;
 	}

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

 	/**
 	 * Field data query
 	 *
 	 * Generates a platform-specific query so that the column data can be retrieved
 	 *
 	 * @param	string	the table name
 	 * @return	object
 	 */
 	protected function _field_data($table)
 	{
 		// Need to find a more efficient way to do this
 		// but Interbase/Firebird seems to lack the
 		// limit clause
 		return "SELECT * FROM {$table}";
 	}

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

 	/**
 	 * Error
 	 *
 	 * Returns an array containing code and message of the last
 	 * database error that has occured.
 	 *
 	 * @return	array
 	 */
 	public function error()
 	{
 		return array('code' => ibase_errcode(), 'message' => ibase_errmsg());
 	}

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

 	/**
 	 * Escape the SQL Identifiers
 	 *
 	 * This public function escapes column and table names
 	 *
 	 * @param	string
 	 * @return	string
 	 */
 	protected function _escape_identifiers($item)
 	{
 		foreach ($this->_reserved_identifiers as $id)
 		{
 			if (strpos($item, '.'.$id) !== FALSE)
 			{
 				$str = $this->_escape_char. str_replace('.', $this->_escape_char.'.', $item);

 				// remove duplicates if the user already included the escape
 				return preg_replace('/['.$this->_escape_char.']+/', $this->_escape_char, $str);
 			}
 		}

 		if (strpos($item, '.') !== FALSE)
 		{
 			$str = $this->_escape_char.str_replace('.', $this->_escape_char.'.'.$this->_escape_char, $item).$this->_escape_char;
 		}
 		else
 		{
 			$str = $this->_escape_char.$item.$this->_escape_char;
 		}

 		// remove duplicates if the user already included the escape
 		return preg_replace('/['.$this->_escape_char.']+/', $this->_escape_char, $str);
 	}

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

 	/**
 	 * From Tables
 	 *
 	 * This public function implicitly groups FROM tables so there is no confusion
 	 * about operator precedence in harmony with SQL standards
 	 *
 	 * @param	type
 	 * @return	type
 	 */
 	protected function _from_tables($tables)
 	{
 		if ( ! is_array($tables))
 		{
 			$tables = array($tables);
 		}

 		//Interbase/Firebird doesn't like grouped tables
 		return implode(', ', $tables);
 	}

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

 	/**
 	 * Insert statement
 	 *
 	 * Generates a platform-specific insert string from the supplied data
 	 *
 	 * @param	string	the table name
 	 * @param	array	the insert keys
 	 * @param	array	the insert values
 	 * @return	string
 	 */
 	protected function _insert($table, $keys, $values)
 	{
 		return "INSERT INTO {$table} (".implode(', ', $keys).') VALUES ('.implode(', ', $values).')';
 	}

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

 	/**
 	 * Update statement
 	 *
 	 * Generates a platform-specific update string from the supplied data
 	 *
 	 * @param	string	the table name
 	 * @param	array	the update data
 	 * @param	array	the where clause
 	 * @param	array	the orderby clause
 	 * @param	array	the limit clause
 	 * @return	string
 	 */
 	protected function _update($table, $values, $where, $orderby = array(), $limit = FALSE)
 	{
 		foreach ($values as $key => $val)
 		{
 			$valstr[] = $key." = ".$val;
 		}

 		//$limit = ( ! $limit) ? '' : ' LIMIT '.$limit;

 		$orderby = (count($orderby) >= 1)?' ORDER BY '.implode(", ", $orderby):'';

 		$sql = "UPDATE {$table} SET ".implode(', ', $valstr);

 		$sql .= ($where != '' AND count($where) >=1) ? ' WHERE '.implode(' ', $where) : '';

 		$sql .= $orderby;

 		return $sql;
 	}


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

 	/**
 	 * Truncate statement
 	 *
 	 * Generates a platform-specific truncate string from the supplied data
 	 * If the database does not support the truncate() command
 	 * This public function maps to "DELETE FROM table"
 	 *
 	 * @param	string	the table name
 	 * @return	string
 	 */
 	protected function _truncate($table)
 	{
 		return $this->_delete($table);
 	}

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

 	/**
 	 * Delete statement
 	 *
 	 * Generates a platform-specific delete string from the supplied data
 	 *
 	 * @param	string	the table name
 	 * @param	array	the where clause
 	 * @param	string	the limit clause
 	 * @return	string
 	 */
 	protected function _delete($table, $where = array(), $like = array(), $limit = FALSE)
 	{
 		$conditions = '';

 		if (count($where) > 0 OR count($like) > 0)
 		{
 			$conditions = "\nWHERE ";
 			$conditions .= implode("\n", $this->ar_where);

 			if (count($where) > 0 && count($like) > 0)
 			{
 				$conditions .= ' AND ';
 			}
 			$conditions .= implode("\n", $like);
 		}

 		//$limit = ( ! $limit) ? '' : ' LIMIT '.$limit;

 		return "DELETE FROM {$table}{$conditions}";
 	}

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

 	/**
 	 * Limit string
 	 *
 	 * Generates a platform-specific LIMIT clause
 	 *
 	 * @param	string	the sql query string
 	 * @param	integer	the number of rows to limit the query to
 	 * @param	integer	the offset value
 	 * @return	string
 	 */
 	protected function _limit($sql, $limit, $offset)
 	{
 		// Keep the current sql string safe for a moment
 		$orig_sql = $sql;

 		// Limit clause depends on if Interbase or Firebird
 		if (stripos($this->version(), 'firebird') !== FALSE)
 		{
 			$sql = 'FIRST '. (int) $limit;

 			if ($offset > 0)
 			{
 				$sql .= ' SKIP '. (int) $offset;
 			}
 		}
 		else
 		{
 			$sql = 'ROWS ' . (int) $limit;

 			if ($offset > 0)
 			{
 				$sql = 'ROWS '. (int) $offset . ' TO ' . ($limit + $offset);
 			}
 		}

 		return preg_replace('`SELECT`i', "SELECT {$sql}", $orig_sql);
 	}

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

 	/**
 	 * Close DB Connection
 	 *
 	 * @param	resource
 	 * @return	void
 	 */
 	protected function _close($conn_id)
 	{
 		@ibase_close($conn_id);
 	}

 }

 /* End of file interbase_driver.php */
 /* Location: ./system/database/drivers/interbase/interbase_driver.php */
	<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
	/**
	* CodeIgniter
	*
	* An open source application development framework for PHP 5.2.4 or newer
	*
	* NOTICE OF LICENSE
	*
	* Licensed under the Open Software License version 3.0
	*
	* This source file is subject to the Open Software License (OSL 3.0) that is
	* bundled with this package in the files license.txt / license.rst. It is
	* also available through the world wide web at this URL:
	* http://opensource.org/licenses/OSL-3.0
	* If you did not receive a copy of the license and are unable to obtain it
	* through the world wide web, please send an email to
	* licensing@ellislab.com so we can send you a copy immediately.
	*
	* @package CodeIgniter
	* @author EllisLab Dev Team
	* @copyright Copyright (c) 2008 - 2012, EllisLab, Inc. (http://ellislab.com/)
	* @license http://opensource.org/licenses/OSL-3.0 Open Software License (OSL 3.0)
	* @link http://codeigniter.com
	* @since Version 3.0
	* @filesource
	*/

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

	/**
	* Firebird/Interbase Database Adapter Class
	*
	* Note: _DB is an extender class that the app controller
	* creates dynamically based on whether the active record
	* class is being used or not.
	*
	* @package CodeIgniter
	* @subpackage Drivers
	* @category Database
	* @author EllisLab Dev Team
	* @link http://codeigniter.com/user_guide/database/
	*/
	class CI_DB_interbase_driver extends CI_DB {

	public $dbdriver = 'interbase';

	// The character used to escape with
	protected $_escape_char = '"';

	// clause and character used for LIKE escape sequences
	protected $_like_escape_str = " ESCAPE '%s' ";
	protected $_like_escape_chr = '!';

	/**
	* The syntax to count rows is slightly different across different
	* database engines, so this string appears in each driver and is
	* used for the count_all() and count_all_results() functions.
	*/
	protected $_count_string = "SELECT COUNT(*) AS ";
	protected $_random_keyword = ' Random()'; // database specific random keyword

	// Keeps track of the resource for the current transaction
	protected $trans;

	/**
	* Non-persistent database connection
	*
	* @return resource
	*/
	public function db_connect()
	{
	return @ibase_connect($this->hostname.':'.$this->database, $this->username, $this->password, $this->char_set);
	}

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

	/**
	* Persistent database connection
	*
	* @return resource
	*/
	public function db_pconnect()
	{
	return @ibase_pconnect($this->hostname.':'.$this->database, $this->username, $this->password, $this->char_set);
	}

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

	/**
	* Reconnect
	*
	* Keep / reestablish the db connection if no queries have been
	* sent for a length of time exceeding the server's idle timeout
	*
	* @return void
	*/
	public function reconnect()
	{
	// not implemented in Interbase/Firebird
	}

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

	/**
	* Select the database
	*
	* @return bool
	*/
	public function db_select()
	{
	// Connection selects the database
	return TRUE;
	}

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

	/**
	* Database version number
	*
	* @return string
	*/
	public function version()
	{
	if (isset($this->data_cache['version']))
	{
	return $this->data_cache['version'];
	}

	if (($service = ibase_service_attach($this->hostname, $this->username, $this->password)))
	{
	$this->data_cache['version'] = ibase_server_info($service, IBASE_SVC_SERVER_VERSION);

	// Don't keep the service open
	ibase_service_detach($service);
	return $this->data_cache['version'];
	}

	return FALSE;
	}

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

	/**
	* Execute the query
	*
	* @param string an SQL query
	* @return resource
	*/
	protected function _execute($sql)
	{
	return @ibase_query($this->conn_id, $sql);
	}

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

	/**
	* Begin Transaction
	*
	* @return bool
	*/
	public function trans_begin($test_mode = FALSE)
	{
	if ( ! $this->trans_enabled)
	{
	return TRUE;
	}

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

	// Reset the transaction failure flag.
	// If the $test_mode flag is set to TRUE transactions will be rolled back
	// even if the queries produce a successful result.
	$this->_trans_failure = ($test_mode === TRUE) ? TRUE : FALSE;

	$this->trans = @ibase_trans($this->conn_id);

	return TRUE;
	}

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

	/**
	* Commit Transaction
	*
	* @return bool
	*/
	public function trans_commit()
	{
	if ( ! $this->trans_enabled)
	{
	return TRUE;
	}

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

	return @ibase_commit($this->trans);
	}

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

	/**
	* Rollback Transaction
	*
	* @return bool
	*/
	public function trans_rollback()
	{
	if ( ! $this->trans_enabled)
	{
	return TRUE;
	}

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

	return @ibase_rollback($this->trans);
	}

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

	/**
	* Escape String
	*
	* @param string
	* @param bool whether or not the string will be used in a LIKE condition
	* @return string
	*/
	public function escape_str($str, $like = FALSE)
	{
	if (is_array($str))
	{
	foreach ($str as $key => $val)
	{
	$str[$key] = $this->escape_str($val, $like);
	}

	return $str;
	}

	// escape LIKE condition wildcards
	if ($like === TRUE)
	{
	$str = str_replace( array('%', '_', $this->_like_escape_chr),
	array($this->_like_escape_chr.'%', $this->_like_escape_chr.'_', $this->_like_escape_chr.$this->_like_escape_chr),
	$str);
	}

	return $str;
	}

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

	/**
	* Affected Rows
	*
	* @return integer
	*/
	public function affected_rows()
	{
	return @ibase_affected_rows($this->conn_id);
	}

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

	/**
	* Insert ID
	*
	* @param string $generator_name
	* @param integer $inc_by
	* @return integer
	*/
	public function insert_id($generator_name, $inc_by=0)
	{
	//If a generator hasn't been used before it will return 0
	return ibase_gen_id('"'.$generator_name.'"', $inc_by);
	}

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

	/**
	* "Count All" query
	*
	* Generates a platform-specific query string that counts all records in
	* the specified database
	*
	* @param string
	* @return string
	*/
	public function count_all($table = '')
	{
	if ($table == '')
	{
	return 0;
	}

	$query = $this->query($this->_count_string.$this->protect_identifiers('numrows').' FROM '.$this->protect_identifiers($table, TRUE, NULL, FALSE));
	if ($query->num_rows() == 0)
	{
	return 0;
	}

	$row = $query->row();
	$this->_reset_select();
	return (int) $row->numrows;
	}

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

	/**
	* List table query
	*
	* Generates a platform-specific query string so that the table names can be fetched
	*
	* @param boolean
	* @return string
	*/
	protected function _list_tables($prefix_limit = FALSE)
	{
	$sql = <<<SQL
	SELECT "RDB\$RELATION_NAME" FROM "RDB\$RELATIONS"
	WHERE "RDB\$RELATION_NAME" NOT LIKE 'RDB$%'
	AND "RDB\$RELATION_NAME" NOT LIKE 'MON$%'
	SQL;

	if ($prefix_limit !== FALSE AND $this->dbprefix != '')
	{
	$sql .= ' AND "RDB$RELATION_NAME" LIKE \''.$this->escape_like_str($this->dbprefix)."%' ".sprintf($this->_like_escape_str, $this->_like_escape_chr);
	}
	return $sql;
	}

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

	/**
	* Show column query
	*
	* Generates a platform-specific query string so that the column names can be fetched
	*
	* @param string the table name
	* @return string
	*/
	protected function _list_columns($table = '')
	{
	return <<<SQL
	SELECT "RDB\$FIELD_NAME" FROM "RDB\$RELATION_FIELDS"
	WHERE "RDB\$RELATION_NAME"='{$table}';
	SQL;
	}

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

	/**
	* Field data query
	*
	* Generates a platform-specific query so that the column data can be retrieved
	*
	* @param string the table name
	* @return object
	*/
	protected function _field_data($table)
	{
	// Need to find a more efficient way to do this
	// but Interbase/Firebird seems to lack the
	// limit clause
	return "SELECT * FROM {$table}";
	}

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

	/**
	* Error
	*
	* Returns an array containing code and message of the last
	* database error that has occured.
	*
	* @return array
	*/
	public function error()
	{
	return array('code' => ibase_errcode(), 'message' => ibase_errmsg());
	}

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

	/**
	* Escape the SQL Identifiers
	*
	* This public function escapes column and table names
	*
	* @param string
	* @return string
	*/
	protected function _escape_identifiers($item)
	{
	foreach ($this->_reserved_identifiers as $id)
	{
	if (strpos($item, '.'.$id) !== FALSE)
	{
	$str = $this->_escape_char. str_replace('.', $this->_escape_char.'.', $item);

	// remove duplicates if the user already included the escape
	return preg_replace('/['.$this->_escape_char.']+/', $this->_escape_char, $str);
	}
	}

	if (strpos($item, '.') !== FALSE)
	{
	$str = $this->_escape_char.str_replace('.', $this->_escape_char.'.'.$this->_escape_char, $item).$this->_escape_char;
	}
	else
	{
	$str = $this->_escape_char.$item.$this->_escape_char;
	}

	// remove duplicates if the user already included the escape
	return preg_replace('/['.$this->_escape_char.']+/', $this->_escape_char, $str);
	}

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

	/**
	* From Tables
	*
	* This public function implicitly groups FROM tables so there is no confusion
	* about operator precedence in harmony with SQL standards
	*
	* @param type
	* @return type
	*/
	protected function _from_tables($tables)
	{
	if ( ! is_array($tables))
	{
	$tables = array($tables);
	}

	//Interbase/Firebird doesn't like grouped tables
	return implode(', ', $tables);
	}

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

	/**
	* Insert statement
	*
	* Generates a platform-specific insert string from the supplied data
	*
	* @param string the table name
	* @param array the insert keys
	* @param array the insert values
	* @return string
	*/
	protected function _insert($table, $keys, $values)
	{
	return "INSERT INTO {$table} (".implode(', ', $keys).') VALUES ('.implode(', ', $values).')';
	}

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

	/**
	* Update statement
	*
	* Generates a platform-specific update string from the supplied data
	*
	* @param string the table name
	* @param array the update data
	* @param array the where clause
	* @param array the orderby clause
	* @param array the limit clause
	* @return string
	*/
	protected function _update($table, $values, $where, $orderby = array(), $limit = FALSE)
	{
	foreach ($values as $key => $val)
	{
	$valstr[] = $key." = ".$val;
	}

	//$limit = ( ! $limit) ? '' : ' LIMIT '.$limit;

	$orderby = (count($orderby) >= 1)?' ORDER BY '.implode(", ", $orderby):'';

	$sql = "UPDATE {$table} SET ".implode(', ', $valstr);

	$sql .= ($where != '' AND count($where) >=1) ? ' WHERE '.implode(' ', $where) : '';

	$sql .= $orderby;

	return $sql;
	}


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

	/**
	* Truncate statement
	*
	* Generates a platform-specific truncate string from the supplied data
	* If the database does not support the truncate() command
	* This public function maps to "DELETE FROM table"
	*
	* @param string the table name
	* @return string
	*/
	protected function _truncate($table)
	{
	return $this->_delete($table);
	}

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

	/**
	* Delete statement
	*
	* Generates a platform-specific delete string from the supplied data
	*
	* @param string the table name
	* @param array the where clause
	* @param string the limit clause
	* @return string
	*/
	protected function _delete($table, $where = array(), $like = array(), $limit = FALSE)
	{
	$conditions = '';

	if (count($where) > 0 OR count($like) > 0)
	{
	$conditions = "\nWHERE ";
	$conditions .= implode("\n", $this->ar_where);

	if (count($where) > 0 && count($like) > 0)
	{
	$conditions .= ' AND ';
	}
	$conditions .= implode("\n", $like);
	}

	//$limit = ( ! $limit) ? '' : ' LIMIT '.$limit;

	return "DELETE FROM {$table}{$conditions}";
	}

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

	/**
	* Limit string
	*
	* Generates a platform-specific LIMIT clause
	*
	* @param string the sql query string
	* @param integer the number of rows to limit the query to
	* @param integer the offset value
	* @return string
	*/
	protected function _limit($sql, $limit, $offset)
	{
	// Keep the current sql string safe for a moment
	$orig_sql = $sql;

	// Limit clause depends on if Interbase or Firebird
	if (stripos($this->version(), 'firebird') !== FALSE)
	{
	$sql = 'FIRST '. (int) $limit;

	if ($offset > 0)
	{
	$sql .= ' SKIP '. (int) $offset;
	}
	}
	else
	{
	$sql = 'ROWS ' . (int) $limit;

	if ($offset > 0)
	{
	$sql = 'ROWS '. (int) $offset . ' TO ' . ($limit + $offset);
	}
	}

	return preg_replace('`SELECT`i', "SELECT {$sql}", $orig_sql);
	}

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

	/**
	* Close DB Connection
	*
	* @param resource
	* @return void
	*/
	protected function _close($conn_id)
	{
	@ibase_close($conn_id);
	}

	}

	/* End of file interbase_driver.php */
	/* Location: ./system/database/drivers/interbase/interbase_driver.php */