system/database/drivers/postgre/postgre_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 1.0
  * @filesource
  */

 /**
  * Postgre Database Adapter Class
  *
  * Note: _DB is an extender class that the app controller
  * creates dynamically based on whether the query builder
  * 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_postgre_driver extends CI_DB {

 	public $dbdriver = 'postgre';

 	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

 	/**
 	 * Constructor
 	 *
 	 * Creates a DSN string to be used for db_connect() and db_pconnect()
 	 *
 	 * @return	void
 	 */
 	public function __construct($params)
 	{
 		parent::__construct($params);

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

 		$this->dsn === '' OR $this->dsn = '';

 		if (strpos($this->hostname, '/') !== FALSE)
 		{
 			// If UNIX sockets are used, we shouldn't set a port
 			$this->port = '';
 		}

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

 		if ( ! empty($this->port) && ctype_digit($this->port))
 		{
 			$this->dsn .= 'port='.$this->port.' ';
 		}

 		if ($this->username !== '')
 		{
 			$this->dsn .= 'user='.$this->username.' ';

 			/* An empty password is valid!
 			 *
 			 * $db['password'] = NULL must be done in order to ignore it.
 			 */
 			$this->password === NULL OR $this->dsn .= "password='".$this->password."' ";
 		}

 		$this->database === '' OR $this->dsn .= 'dbname='.$this->database.' ';

 		/* We don't have these options as elements in our standard configuration
 		 * array, but they might be set by parse_url() if the configuration was
 		 * provided via string. Example:
 		 *
 		 * postgre://username:password@localhost:5432/database?connect_timeout=5&sslmode=1
 		 */
 		foreach (array('connect_timeout', 'options', 'sslmode', 'service') as $key)
 		{
 			if (isset($this->$key) && is_string($this->key) && $this->key !== '')
 			{
 				$this->dsn .= $key."='".$this->key."' ";
 			}
 		}

 		$this->dsn = rtrim($this->dsn);
 	}

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

 	/**
 	 * Non-persistent database connection
 	 *
 	 * @return	resource
 	 */
 	public function db_connect()
 	{
 		return @pg_connect($this->dsn);
 	}

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

 	/**
 	 * Persistent database connection
 	 *
 	 * @return	resource
 	 */
 	public function db_pconnect()
 	{
 		return @pg_pconnect($this->dsn);
 	}

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

 	/**
 	 * 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()
 	{
 		if (pg_ping($this->conn_id) === FALSE)
 		{
 			$this->conn_id = FALSE;
 		}
 	}

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

 	/**
 	 * Set client character set
 	 *
 	 * @param	string
 	 * @return	bool
 	 */
 	protected function _db_set_charset($charset)
 	{
 		return (pg_set_client_encoding($this->conn_id, $charset) === 0);
 	}

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

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

 		if (($pg_version = pg_version($this->conn_id)) === FALSE)
 		{
 			return FALSE;
 		}

 		/* If PHP was compiled with PostgreSQL lib versions earlier
 		 * than 7.4, pg_version() won't return the server version
 		 * and so we'll have to fall back to running a query in
 		 * order to get it.
 		 */
 		return isset($pg_version['server'])
 			? $this->data_cache['version'] = $pg_version['server']
 			: parent::version();
 	}

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

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

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

 	/**
 	 * Begin Transaction
 	 *
 	 * @param	bool
 	 * @return	bool
 	 */
 	public function trans_begin($test_mode = FALSE)
 	{
 		// When transactions are nested we only begin/commit/rollback the outermost ones
 		if ( ! $this->trans_enabled OR $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);

 		return (bool) @pg_query($this->conn_id, 'BEGIN');
 	}

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

 	/**
 	 * Commit Transaction
 	 *
 	 * @return	bool
 	 */
 	public function trans_commit()
 	{
 		// When transactions are nested we only begin/commit/rollback the outermost ones
 		if ( ! $this->trans_enabled OR $this->_trans_depth > 0)
 		{
 			return TRUE;
 		}

 		return (bool) @pg_query($this->conn_id, 'COMMIT');
 	}

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

 	/**
 	 * Rollback Transaction
 	 *
 	 * @return	bool
 	 */
 	public function trans_rollback()
 	{
 		// When transactions are nested we only begin/commit/rollback the outermost ones
 		if ( ! $this->trans_enabled OR $this->_trans_depth > 0)
 		{
 			return TRUE;
 		}

 		return (bool) @pg_query($this->conn_id, 'ROLLBACK');
 	}

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

 	/**
 	 * 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;
 		}

 		$str = pg_escape_string($str);

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

 		return $str;
 	}

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

 	/**
 	 * "Smart" Escape String
 	 *
 	 * Escapes data based on type
 	 * Sets boolean and null types
 	 *
 	 * @param	string
 	 * @return	mixed
 	 */
 	public function escape($str)
 	{
 		if (is_bool($str))
 		{
 			return ($str) ? 'TRUE' : 'FALSE';
 		}

 		return parent::escape($str);
 	}

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

 	/**
 	 * Affected Rows
 	 *
 	 * @return	int
 	 */
 	public function affected_rows()
 	{
 		return @pg_affected_rows($this->result_id);
 	}

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

 	/**
 	 * Insert ID
 	 *
 	 * @return	string
 	 */
 	public function insert_id()
 	{
 		$v = pg_version($this->conn_id);
 		$v = isset($v['server']) ? $v['server'] : 0; // 'server' key is only available since PosgreSQL 7.4

 		$table	= (func_num_args() > 0) ? func_get_arg(0) : NULL;
 		$column	= (func_num_args() > 1) ? func_get_arg(1) : NULL;

 		if ($table === NULL && $v >= '8.1')
 		{
 			$sql = 'SELECT LASTVAL() AS ins_id';
 		}
 		elseif ($table !== NULL)
 		{
 			if ($column !== NULL && $v >= '8.0')
 			{
 				$sql = 'SELECT pg_get_serial_sequence(\''.$table."', '".$column."') AS seq";
 				$query = $this->query($sql);
 				$query = $query->row();
 				$seq = $query->seq;
 			}
 			else
 			{
 				// seq_name passed in table parameter
 				$seq = $table;
 			}

 			$sql = 'SELECT CURRVAL(\''.$seq."') AS ins_id";
 		}
 		else
 		{
 			return pg_last_oid($this->result_id);
 		}

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

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

 	/**
 	 * Show table query
 	 *
 	 * Generates a platform-specific query string so that the table names can be fetched
 	 *
 	 * @param	bool
 	 * @return	string
 	 */
 	protected function _list_tables($prefix_limit = FALSE)
 	{
 		$sql = "SELECT table_name FROM information_schema.tables WHERE table_schema = 'public'";

 		if ($prefix_limit !== FALSE && $this->dbprefix !== '')
 		{
 			return $sql." AND table_name LIKE '".$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($table = '')
 	{
 		return "SELECT column_name FROM information_schema.columns WHERE table_name = '".$table."'";
 	}

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

 	/**
 	 * Field data query
 	 *
 	 * Generates a platform-specific query so that the column data can be retrieved
 	 *
 	 * @param	string	the table name
 	 * @return	string
 	 */
 	protected function _field_data($table)
 	{
 		return 'SELECT * FROM '.$table.' LIMIT 1';
 	}

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

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

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

 	/**
 	 * From Tables
 	 *
 	 * This function implicitly groups FROM tables so there is no confusion
 	 * about operator precedence in harmony with SQL standards
 	 *
 	 * @param	array
 	 * @return	string
 	 */
 	protected function _from_tables($tables)
 	{
 		return is_array($tables) ? implode(', ', $tables) : $tables;
 	}

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

 	/**
 	 * 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 (ignored)
 	 * @param	array	the limit clause (ignored)
 	 * @param	array	the like clause
 	 * @return	string
 	 */
 	protected function _update($table, $values, $where, $orderby = array(), $limit = FALSE, $like = array())
 	{
 		foreach ($values as $key => $val)
 		{
 			$valstr[] = $key.' = '.$val;
 		}

 		$where = empty($where) ? '' : ' WHERE '.implode(' ', $where);

 		if ( ! empty($like))
 		{
 			$where .= ($where === '' ? ' WHERE ' : ' AND ').implode(' ', $like);
 		}

 		return 'UPDATE '.$table.' SET '.implode(', ', $valstr).$where;
 	}

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

 	/**
 	 * Update_Batch statement
 	 *
 	 * Generates a platform-specific batch update string from the supplied data
 	 *
 	 * @param	string	the table name
 	 * @param	array	the update data
 	 * @param	array	the where clause
 	 * @return	string
 	 */
 	protected function _update_batch($table, $values, $index, $where = NULL)
 	{
 		$ids = array();
 		foreach ($values as $key => $val)
 		{
 			$ids[] = $val[$index];

 			foreach (array_keys($val) as $field)
 			{
 				if ($field !== $index)
 				{
 					$final[$field][] =  'WHEN '.$val[$index].' THEN '.$val[$field];
 				}
 			}
 		}

 		$cases = '';
 		foreach ($final as $k => $v)
 		{
 			$cases .= $k.' = (CASE '.$k."\n"
 				.implode("\n", $v)."\n"
 				.'ELSE '.$k.' END), ';
 		}

 		return 'UPDATE '.$table.' SET '.substr($cases, 0, -2)
 			.' WHERE '.(($where !== '' && count($where) > 0) ? implode(' ', $where).' AND ' : '')
 			.$index.' IN('.implode(',', $ids).')';
 	}

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

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

 		empty($where) OR $conditions[] = implode(' ', $where);
 		empty($like) OR $conditions[] = implode(' ', $like);

 		return 'DELETE FROM '.$table.(count($conditions) > 0 ? ' WHERE '.implode(' AND ', $conditions) : '');
 	}

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

 	/**
 	 * Limit string
 	 *
 	 * Generates a platform-specific LIMIT clause
 	 *
 	 * @param	string	the sql query string
 	 * @param	int	the number of rows to limit the query to
 	 * @param	int	the offset value
 	 * @return	string
 	 */
 	protected function _limit($sql, $limit, $offset)
 	{
 		return $sql.' LIMIT '.$limit.($offset == 0 ? '' : ' OFFSET '.$offset);
 	}

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

 	/**
 	 * Where
 	 *
 	 * Called by where() or or_where()
 	 *
 	 * @param	mixed
 	 * @param	mixed
 	 * @param	string
 	 * @return	object
 	 *
 	 */
 	protected function _where($key, $value = NULL, $type = 'AND ', $escape = NULL)
 	{
 		$type = $this->_group_get_type($type);

 		if ( ! is_array($key))
 		{
 			$key = array($key => $value);
 		}

 		// If the escape value was not set will will base it on the global setting
 		is_bool($escape) OR $escape = $this->_protect_identifiers;

 		foreach ($key as $k => $v)
 		{
 			$prefix = (count($this->qb_where) === 0 && count($this->qb_cache_where) === 0) ? '' : $type;

 			$k = (($op = $this->_get_operator($k)) !== FALSE)
 				? $this->protect_identifiers(substr($k, 0, strpos($k, $op)), FALSE, $escape).strstr($k, $op)
 				: $this->protect_identifiers($k, FALSE, $escape);

 			if (is_null($v) && ! $this->_has_operator($k))
 			{
 				// value appears not to have been set, assign the test to IS NULL
 				$k .= ' IS NULL';
 			}

 			if ( ! is_null($v))
 			{
 				if ($escape === TRUE)
 				{
 					$v = ' '.$this->escape($v);
 				}
 				elseif (is_bool($v))
 				{
 					$v = ($v ? ' TRUE' : ' FALSE');
 				}

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

 			$this->qb_where[] = $prefix.$k.$v;
 			if ($this->qb_caching === TRUE)
 			{
 				$this->qb_cache_where[] = $prefix.$k.$v;
 				$this->qb_cache_exists[] = 'where';
 			}

 		}

 		return $this;
 	}

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

 	/**
 	 * Close DB Connection
 	 *
 	 * @return	void
 	 */
 	protected function _close()
 	{
 		@pg_close($this->conn_id);
 	}

 }

 /* End of file postgre_driver.php */
 /* Location: ./system/database/drivers/postgre/postgre_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 1.0
	* @filesource
	*/

	/**
	* Postgre Database Adapter Class
	*
	* Note: _DB is an extender class that the app controller
	* creates dynamically based on whether the query builder
	* 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_postgre_driver extends CI_DB {

	public $dbdriver = 'postgre';

	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

	/**
	* Constructor
	*
	* Creates a DSN string to be used for db_connect() and db_pconnect()
	*
	* @return void
	*/
	public function __construct($params)
	{
	parent::__construct($params);

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

	$this->dsn === '' OR $this->dsn = '';

	if (strpos($this->hostname, '/') !== FALSE)
	{
	// If UNIX sockets are used, we shouldn't set a port
	$this->port = '';
	}

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

	if ( ! empty($this->port) && ctype_digit($this->port))
	{
	$this->dsn .= 'port='.$this->port.' ';
	}

	if ($this->username !== '')
	{
	$this->dsn .= 'user='.$this->username.' ';

	/* An empty password is valid!
	*
	* $db['password'] = NULL must be done in order to ignore it.
	*/
	$this->password === NULL OR $this->dsn .= "password='".$this->password."' ";
	}

	$this->database === '' OR $this->dsn .= 'dbname='.$this->database.' ';

	/* We don't have these options as elements in our standard configuration
	* array, but they might be set by parse_url() if the configuration was
	* provided via string. Example:
	*
	* postgre://username:password@localhost:5432/database?connect_timeout=5&sslmode=1
	*/
	foreach (array('connect_timeout', 'options', 'sslmode', 'service') as $key)
	{
	if (isset($this->$key) && is_string($this->key) && $this->key !== '')
	{
	$this->dsn .= $key."='".$this->key."' ";
	}
	}

	$this->dsn = rtrim($this->dsn);
	}

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

	/**
	* Non-persistent database connection
	*
	* @return resource
	*/
	public function db_connect()
	{
	return @pg_connect($this->dsn);
	}

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

	/**
	* Persistent database connection
	*
	* @return resource
	*/
	public function db_pconnect()
	{
	return @pg_pconnect($this->dsn);
	}

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

	/**
	* 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()
	{
	if (pg_ping($this->conn_id) === FALSE)
	{
	$this->conn_id = FALSE;
	}
	}

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

	/**
	* Set client character set
	*
	* @param string
	* @return bool
	*/
	protected function _db_set_charset($charset)
	{
	return (pg_set_client_encoding($this->conn_id, $charset) === 0);
	}

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

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

	if (($pg_version = pg_version($this->conn_id)) === FALSE)
	{
	return FALSE;
	}

	/* If PHP was compiled with PostgreSQL lib versions earlier
	* than 7.4, pg_version() won't return the server version
	* and so we'll have to fall back to running a query in
	* order to get it.
	*/
	return isset($pg_version['server'])
	? $this->data_cache['version'] = $pg_version['server']
	: parent::version();
	}

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

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

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

	/**
	* Begin Transaction
	*
	* @param bool
	* @return bool
	*/
	public function trans_begin($test_mode = FALSE)
	{
	// When transactions are nested we only begin/commit/rollback the outermost ones
	if ( ! $this->trans_enabled OR $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);

	return (bool) @pg_query($this->conn_id, 'BEGIN');
	}

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

	/**
	* Commit Transaction
	*
	* @return bool
	*/
	public function trans_commit()
	{
	// When transactions are nested we only begin/commit/rollback the outermost ones
	if ( ! $this->trans_enabled OR $this->_trans_depth > 0)
	{
	return TRUE;
	}

	return (bool) @pg_query($this->conn_id, 'COMMIT');
	}

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

	/**
	* Rollback Transaction
	*
	* @return bool
	*/
	public function trans_rollback()
	{
	// When transactions are nested we only begin/commit/rollback the outermost ones
	if ( ! $this->trans_enabled OR $this->_trans_depth > 0)
	{
	return TRUE;
	}

	return (bool) @pg_query($this->conn_id, 'ROLLBACK');
	}

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

	/**
	* 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;
	}

	$str = pg_escape_string($str);

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

	return $str;
	}

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

	/**
	* "Smart" Escape String
	*
	* Escapes data based on type
	* Sets boolean and null types
	*
	* @param string
	* @return mixed
	*/
	public function escape($str)
	{
	if (is_bool($str))
	{
	return ($str) ? 'TRUE' : 'FALSE';
	}

	return parent::escape($str);
	}

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

	/**
	* Affected Rows
	*
	* @return int
	*/
	public function affected_rows()
	{
	return @pg_affected_rows($this->result_id);
	}

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

	/**
	* Insert ID
	*
	* @return string
	*/
	public function insert_id()
	{
	$v = pg_version($this->conn_id);
	$v = isset($v['server']) ? $v['server'] : 0; // 'server' key is only available since PosgreSQL 7.4

	$table = (func_num_args() > 0) ? func_get_arg(0) : NULL;
	$column = (func_num_args() > 1) ? func_get_arg(1) : NULL;

	if ($table === NULL && $v >= '8.1')
	{
	$sql = 'SELECT LASTVAL() AS ins_id';
	}
	elseif ($table !== NULL)
	{
	if ($column !== NULL && $v >= '8.0')
	{
	$sql = 'SELECT pg_get_serial_sequence(\''.$table."', '".$column."') AS seq";
	$query = $this->query($sql);
	$query = $query->row();
	$seq = $query->seq;
	}
	else
	{
	// seq_name passed in table parameter
	$seq = $table;
	}

	$sql = 'SELECT CURRVAL(\''.$seq."') AS ins_id";
	}
	else
	{
	return pg_last_oid($this->result_id);
	}

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

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

	/**
	* Show table query
	*
	* Generates a platform-specific query string so that the table names can be fetched
	*
	* @param bool
	* @return string
	*/
	protected function _list_tables($prefix_limit = FALSE)
	{
	$sql = "SELECT table_name FROM information_schema.tables WHERE table_schema = 'public'";

	if ($prefix_limit !== FALSE && $this->dbprefix !== '')
	{
	return $sql." AND table_name LIKE '".$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($table = '')
	{
	return "SELECT column_name FROM information_schema.columns WHERE table_name = '".$table."'";
	}

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

	/**
	* Field data query
	*
	* Generates a platform-specific query so that the column data can be retrieved
	*
	* @param string the table name
	* @return string
	*/
	protected function _field_data($table)
	{
	return 'SELECT * FROM '.$table.' LIMIT 1';
	}

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

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

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

	/**
	* From Tables
	*
	* This function implicitly groups FROM tables so there is no confusion
	* about operator precedence in harmony with SQL standards
	*
	* @param array
	* @return string
	*/
	protected function _from_tables($tables)
	{
	return is_array($tables) ? implode(', ', $tables) : $tables;
	}

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

	/**
	* 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 (ignored)
	* @param array the limit clause (ignored)
	* @param array the like clause
	* @return string
	*/
	protected function _update($table, $values, $where, $orderby = array(), $limit = FALSE, $like = array())
	{
	foreach ($values as $key => $val)
	{
	$valstr[] = $key.' = '.$val;
	}

	$where = empty($where) ? '' : ' WHERE '.implode(' ', $where);

	if ( ! empty($like))
	{
	$where .= ($where === '' ? ' WHERE ' : ' AND ').implode(' ', $like);
	}

	return 'UPDATE '.$table.' SET '.implode(', ', $valstr).$where;
	}

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

	/**
	* Update_Batch statement
	*
	* Generates a platform-specific batch update string from the supplied data
	*
	* @param string the table name
	* @param array the update data
	* @param array the where clause
	* @return string
	*/
	protected function _update_batch($table, $values, $index, $where = NULL)
	{
	$ids = array();
	foreach ($values as $key => $val)
	{
	$ids[] = $val[$index];

	foreach (array_keys($val) as $field)
	{
	if ($field !== $index)
	{
	$final[$field][] = 'WHEN '.$val[$index].' THEN '.$val[$field];
	}
	}
	}

	$cases = '';
	foreach ($final as $k => $v)
	{
	$cases .= $k.' = (CASE '.$k."\n"
	.implode("\n", $v)."\n"
	.'ELSE '.$k.' END), ';
	}

	return 'UPDATE '.$table.' SET '.substr($cases, 0, -2)
	.' WHERE '.(($where !== '' && count($where) > 0) ? implode(' ', $where).' AND ' : '')
	.$index.' IN('.implode(',', $ids).')';
	}

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

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

	empty($where) OR $conditions[] = implode(' ', $where);
	empty($like) OR $conditions[] = implode(' ', $like);

	return 'DELETE FROM '.$table.(count($conditions) > 0 ? ' WHERE '.implode(' AND ', $conditions) : '');
	}

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

	/**
	* Limit string
	*
	* Generates a platform-specific LIMIT clause
	*
	* @param string the sql query string
	* @param int the number of rows to limit the query to
	* @param int the offset value
	* @return string
	*/
	protected function _limit($sql, $limit, $offset)
	{
	return $sql.' LIMIT '.$limit.($offset == 0 ? '' : ' OFFSET '.$offset);
	}

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

	/**
	* Where
	*
	* Called by where() or or_where()
	*
	* @param mixed
	* @param mixed
	* @param string
	* @return object
	*
	*/
	protected function _where($key, $value = NULL, $type = 'AND ', $escape = NULL)
	{
	$type = $this->_group_get_type($type);

	if ( ! is_array($key))
	{
	$key = array($key => $value);
	}

	// If the escape value was not set will will base it on the global setting
	is_bool($escape) OR $escape = $this->_protect_identifiers;

	foreach ($key as $k => $v)
	{
	$prefix = (count($this->qb_where) === 0 && count($this->qb_cache_where) === 0) ? '' : $type;

	$k = (($op = $this->_get_operator($k)) !== FALSE)
	? $this->protect_identifiers(substr($k, 0, strpos($k, $op)), FALSE, $escape).strstr($k, $op)
	: $this->protect_identifiers($k, FALSE, $escape);

	if (is_null($v) && ! $this->_has_operator($k))
	{
	// value appears not to have been set, assign the test to IS NULL
	$k .= ' IS NULL';
	}

	if ( ! is_null($v))
	{
	if ($escape === TRUE)
	{
	$v = ' '.$this->escape($v);
	}
	elseif (is_bool($v))
	{
	$v = ($v ? ' TRUE' : ' FALSE');
	}

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

	$this->qb_where[] = $prefix.$k.$v;
	if ($this->qb_caching === TRUE)
	{
	$this->qb_cache_where[] = $prefix.$k.$v;
	$this->qb_cache_exists[] = 'where';
	}

	}

	return $this;
	}

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

	/**
	* Close DB Connection
	*
	* @return void
	*/
	protected function _close()
	{
	@pg_close($this->conn_id);
	}

	}

	/* End of file postgre_driver.php */
	/* Location: ./system/database/drivers/postgre/postgre_driver.php */