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703
system/database/drivers/postgre/postgre_driver.php
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703
system/database/drivers/postgre/postgre_driver.php
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@ -0,0 +1,703 @@
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<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
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/**
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* CodeIgniter
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*
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* An open source application development framework for PHP 5.1.6 or newer
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*
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* @package CodeIgniter
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* @author ExpressionEngine Dev Team
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* @copyright Copyright (c) 2008 - 2011, EllisLab, Inc.
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* @license http://codeigniter.com/user_guide/license.html
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* @link http://codeigniter.com
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* @since Version 1.0
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* @filesource
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*/
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// ------------------------------------------------------------------------
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/**
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* Postgre Database Adapter Class
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*
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* Note: _DB is an extender class that the app controller
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* creates dynamically based on whether the active record
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* class is being used or not.
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*
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* @package CodeIgniter
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* @subpackage Drivers
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* @category Database
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* @author ExpressionEngine Dev Team
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* @link http://codeigniter.com/user_guide/database/
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*/
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class CI_DB_postgre_driver extends CI_DB {
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var $dbdriver = 'postgre';
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var $_escape_char = '"';
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// clause and character used for LIKE escape sequences
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var $_like_escape_str = " ESCAPE '%s' ";
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var $_like_escape_chr = '!';
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/**
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* The syntax to count rows is slightly different across different
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* database engines, so this string appears in each driver and is
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* used for the count_all() and count_all_results() functions.
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*/
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var $_count_string = "SELECT COUNT(*) AS ";
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var $_random_keyword = ' RANDOM()'; // database specific random keyword
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/**
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* Connection String
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*
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* @access private
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* @return string
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*/
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function _connect_string()
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{
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$components = array(
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'hostname' => 'host',
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'port' => 'port',
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'database' => 'dbname',
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'username' => 'user',
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'password' => 'password'
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);
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$connect_string = "";
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foreach ($components as $key => $val)
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{
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if (isset($this->$key) && $this->$key != '')
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{
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$connect_string .= " $val=".$this->$key;
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}
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}
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return trim($connect_string);
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}
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// --------------------------------------------------------------------
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/**
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* Non-persistent database connection
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*
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* @access private called by the base class
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* @return resource
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*/
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function db_connect()
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{
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return @pg_connect($this->_connect_string());
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}
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// --------------------------------------------------------------------
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/**
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* Persistent database connection
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*
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* @access private called by the base class
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* @return resource
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*/
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function db_pconnect()
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{
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return @pg_pconnect($this->_connect_string());
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}
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// --------------------------------------------------------------------
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/**
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* Reconnect
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*
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* Keep / reestablish the db connection if no queries have been
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* sent for a length of time exceeding the server's idle timeout
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*
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* @access public
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* @return void
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*/
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function reconnect()
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{
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if (pg_ping($this->conn_id) === FALSE)
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{
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$this->conn_id = FALSE;
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}
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}
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// --------------------------------------------------------------------
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/**
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* Select the database
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*
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* @access private called by the base class
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* @return resource
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*/
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function db_select()
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{
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// Not needed for Postgre so we'll return TRUE
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return TRUE;
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}
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// --------------------------------------------------------------------
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/**
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* Set client character set
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*
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* @access public
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* @param string
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* @param string
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* @return resource
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*/
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function db_set_charset($charset, $collation)
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{
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// @todo - add support if needed
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return TRUE;
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}
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// --------------------------------------------------------------------
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/**
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* Version number query string
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*
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* @access public
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* @return string
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*/
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function _version()
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{
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return "SELECT version() AS ver";
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}
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// --------------------------------------------------------------------
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/**
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* Execute the query
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*
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* @access private called by the base class
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* @param string an SQL query
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* @return resource
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*/
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function _execute($sql)
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{
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$sql = $this->_prep_query($sql);
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return @pg_query($this->conn_id, $sql);
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}
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// --------------------------------------------------------------------
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/**
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* Prep the query
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*
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* If needed, each database adapter can prep the query string
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*
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* @access private called by execute()
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* @param string an SQL query
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* @return string
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*/
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function _prep_query($sql)
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{
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return $sql;
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}
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// --------------------------------------------------------------------
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/**
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* Begin Transaction
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*
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* @access public
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* @return bool
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*/
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function trans_begin($test_mode = FALSE)
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{
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if ( ! $this->trans_enabled)
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{
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return TRUE;
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}
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// When transactions are nested we only begin/commit/rollback the outermost ones
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if ($this->_trans_depth > 0)
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{
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return TRUE;
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}
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// Reset the transaction failure flag.
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// If the $test_mode flag is set to TRUE transactions will be rolled back
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// even if the queries produce a successful result.
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$this->_trans_failure = ($test_mode === TRUE) ? TRUE : FALSE;
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return @pg_exec($this->conn_id, "begin");
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}
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// --------------------------------------------------------------------
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/**
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* Commit Transaction
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*
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* @access public
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* @return bool
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*/
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function trans_commit()
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{
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if ( ! $this->trans_enabled)
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{
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return TRUE;
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}
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// When transactions are nested we only begin/commit/rollback the outermost ones
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if ($this->_trans_depth > 0)
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{
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return TRUE;
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}
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return @pg_exec($this->conn_id, "commit");
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}
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// --------------------------------------------------------------------
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/**
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* Rollback Transaction
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*
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* @access public
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* @return bool
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*/
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function trans_rollback()
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{
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if ( ! $this->trans_enabled)
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{
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return TRUE;
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}
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// When transactions are nested we only begin/commit/rollback the outermost ones
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if ($this->_trans_depth > 0)
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{
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return TRUE;
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}
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return @pg_exec($this->conn_id, "rollback");
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}
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// --------------------------------------------------------------------
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/**
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* Escape String
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*
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* @access public
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* @param string
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* @param bool whether or not the string will be used in a LIKE condition
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* @return string
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*/
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function escape_str($str, $like = FALSE)
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{
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if (is_array($str))
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{
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foreach ($str as $key => $val)
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{
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$str[$key] = $this->escape_str($val, $like);
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}
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return $str;
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}
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$str = pg_escape_string($str);
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// escape LIKE condition wildcards
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if ($like === TRUE)
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{
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$str = str_replace( array('%', '_', $this->_like_escape_chr),
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array($this->_like_escape_chr.'%', $this->_like_escape_chr.'_', $this->_like_escape_chr.$this->_like_escape_chr),
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$str);
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}
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return $str;
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}
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// --------------------------------------------------------------------
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/**
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* Affected Rows
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*
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* @access public
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* @return integer
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*/
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function affected_rows()
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{
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return @pg_affected_rows($this->result_id);
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}
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// --------------------------------------------------------------------
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/**
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* Insert ID
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*
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* @access public
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* @return integer
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*/
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function insert_id()
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{
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$v = $this->_version();
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$v = $v['server'];
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$table = func_num_args() > 0 ? func_get_arg(0) : NULL;
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$column = func_num_args() > 1 ? func_get_arg(1) : NULL;
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if ($table == NULL && $v >= '8.1')
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{
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$sql='SELECT LASTVAL() as ins_id';
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}
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elseif ($table != NULL && $column != NULL && $v >= '8.0')
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{
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$sql = sprintf("SELECT pg_get_serial_sequence('%s','%s') as seq", $table, $column);
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$query = $this->query($sql);
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$row = $query->row();
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$sql = sprintf("SELECT CURRVAL('%s') as ins_id", $row->seq);
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||||
}
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elseif ($table != NULL)
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{
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// seq_name passed in table parameter
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$sql = sprintf("SELECT CURRVAL('%s') as ins_id", $table);
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}
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else
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{
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return pg_last_oid($this->result_id);
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}
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$query = $this->query($sql);
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||||
$row = $query->row();
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return $row->ins_id;
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||||
}
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||||
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||||
// --------------------------------------------------------------------
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||||
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||||
/**
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||||
* "Count All" query
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||||
*
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||||
* Generates a platform-specific query string that counts all records in
|
||||
* the specified database
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||||
*
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||||
* @access public
|
||||
* @param string
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||||
* @return string
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||||
*/
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||||
function count_all($table = '')
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||||
{
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||||
if ($table == '')
|
||||
{
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||||
return 0;
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||||
}
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||||
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||||
$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) $row->numrows;
|
||||
}
|
||||
|
||||
// --------------------------------------------------------------------
|
||||
|
||||
/**
|
||||
* Show table query
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||||
*
|
||||
* Generates a platform-specific query string so that the table names can be fetched
|
||||
*
|
||||
* @access private
|
||||
* @param boolean
|
||||
* @return string
|
||||
*/
|
||||
function _list_tables($prefix_limit = FALSE)
|
||||
{
|
||||
$sql = "SELECT table_name FROM information_schema.tables WHERE table_schema = 'public'";
|
||||
|
||||
if ($prefix_limit !== FALSE AND $this->dbprefix != '')
|
||||
{
|
||||
$sql .= " AND table_name LIKE '".$this->escape_like_str($this->dbprefix)."%' ".sprintf($this->_like_escape_str, $this->_like_escape_chr);
|
||||
}
|
||||
|
||||
return $sql;
|
||||
}
|
||||
|
||||
// --------------------------------------------------------------------
|
||||
|
||||
/**
|
||||
* Show column query
|
||||
*
|
||||
* Generates a platform-specific query string so that the column names can be fetched
|
||||
*
|
||||
* @access public
|
||||
* @param string the table name
|
||||
* @return string
|
||||
*/
|
||||
function _list_columns($table = '')
|
||||
{
|
||||
return "SELECT column_name FROM information_schema.columns WHERE table_name ='".$table."'";
|
||||
}
|
||||
|
||||
// --------------------------------------------------------------------
|
||||
|
||||
/**
|
||||
* Field data query
|
||||
*
|
||||
* Generates a platform-specific query so that the column data can be retrieved
|
||||
*
|
||||
* @access public
|
||||
* @param string the table name
|
||||
* @return object
|
||||
*/
|
||||
function _field_data($table)
|
||||
{
|
||||
return "SELECT * FROM ".$table." LIMIT 1";
|
||||
}
|
||||
|
||||
// --------------------------------------------------------------------
|
||||
|
||||
/**
|
||||
* The error message string
|
||||
*
|
||||
* @access private
|
||||
* @return string
|
||||
*/
|
||||
function _error_message()
|
||||
{
|
||||
return pg_last_error($this->conn_id);
|
||||
}
|
||||
|
||||
// --------------------------------------------------------------------
|
||||
|
||||
/**
|
||||
* The error message number
|
||||
*
|
||||
* @access private
|
||||
* @return integer
|
||||
*/
|
||||
function _error_number()
|
||||
{
|
||||
return '';
|
||||
}
|
||||
|
||||
// --------------------------------------------------------------------
|
||||
|
||||
/**
|
||||
* Escape the SQL Identifiers
|
||||
*
|
||||
* This function escapes column and table names
|
||||
*
|
||||
* @access private
|
||||
* @param string
|
||||
* @return string
|
||||
*/
|
||||
function _escape_identifiers($item)
|
||||
{
|
||||
if ($this->_escape_char == '')
|
||||
{
|
||||
return $item;
|
||||
}
|
||||
|
||||
foreach ($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, $str);
|
||||
}
|
||||
|
||||
// --------------------------------------------------------------------
|
||||
|
||||
/**
|
||||
* From Tables
|
||||
*
|
||||
* This function implicitly groups FROM tables so there is no confusion
|
||||
* about operator precedence in harmony with SQL standards
|
||||
*
|
||||
* @access public
|
||||
* @param type
|
||||
* @return type
|
||||
*/
|
||||
function _from_tables($tables)
|
||||
{
|
||||
if ( ! is_array($tables))
|
||||
{
|
||||
$tables = array($tables);
|
||||
}
|
||||
|
||||
return implode(', ', $tables);
|
||||
}
|
||||
|
||||
// --------------------------------------------------------------------
|
||||
|
||||
/**
|
||||
* Insert statement
|
||||
*
|
||||
* Generates a platform-specific insert string from the supplied data
|
||||
*
|
||||
* @access public
|
||||
* @param string the table name
|
||||
* @param array the insert keys
|
||||
* @param array the insert values
|
||||
* @return string
|
||||
*/
|
||||
function _insert($table, $keys, $values)
|
||||
{
|
||||
return "INSERT INTO ".$table." (".implode(', ', $keys).") VALUES (".implode(', ', $values).")";
|
||||
}
|
||||
|
||||
// --------------------------------------------------------------------
|
||||
|
||||
/**
|
||||
* Insert_batch statement
|
||||
*
|
||||
* Generates a platform-specific insert string from the supplied data
|
||||
*
|
||||
* @access public
|
||||
* @param string the table name
|
||||
* @param array the insert keys
|
||||
* @param array the insert values
|
||||
* @return string
|
||||
*/
|
||||
function _insert_batch($table, $keys, $values)
|
||||
{
|
||||
return "INSERT INTO ".$table." (".implode(', ', $keys).") VALUES ".implode(', ', $values);
|
||||
}
|
||||
|
||||
// --------------------------------------------------------------------
|
||||
|
||||
/**
|
||||
* Update statement
|
||||
*
|
||||
* Generates a platform-specific update string from the supplied data
|
||||
*
|
||||
* @access public
|
||||
* @param string the table name
|
||||
* @param array the update data
|
||||
* @param array the where clause
|
||||
* @param array the orderby clause
|
||||
* @param array the limit clause
|
||||
* @return string
|
||||
*/
|
||||
function _update($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 .= $orderby.$limit;
|
||||
|
||||
return $sql;
|
||||
}
|
||||
|
||||
// --------------------------------------------------------------------
|
||||
|
||||
/**
|
||||
* Truncate statement
|
||||
*
|
||||
* Generates a platform-specific truncate string from the supplied data
|
||||
* If the database does not support the truncate() command
|
||||
* This function maps to "DELETE FROM table"
|
||||
*
|
||||
* @access public
|
||||
* @param string the table name
|
||||
* @return string
|
||||
*/
|
||||
function _truncate($table)
|
||||
{
|
||||
return "TRUNCATE ".$table;
|
||||
}
|
||||
|
||||
// --------------------------------------------------------------------
|
||||
|
||||
/**
|
||||
* Delete statement
|
||||
*
|
||||
* Generates a platform-specific delete string from the supplied data
|
||||
*
|
||||
* @access public
|
||||
* @param string the table name
|
||||
* @param array the where clause
|
||||
* @param string the limit clause
|
||||
* @return string
|
||||
*/
|
||||
function _delete($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.$limit;
|
||||
}
|
||||
|
||||
// --------------------------------------------------------------------
|
||||
/**
|
||||
* Limit string
|
||||
*
|
||||
* Generates a platform-specific LIMIT clause
|
||||
*
|
||||
* @access public
|
||||
* @param string the sql query string
|
||||
* @param integer the number of rows to limit the query to
|
||||
* @param integer the offset value
|
||||
* @return string
|
||||
*/
|
||||
function _limit($sql, $limit, $offset)
|
||||
{
|
||||
$sql .= "LIMIT ".$limit;
|
||||
|
||||
if ($offset > 0)
|
||||
{
|
||||
$sql .= " OFFSET ".$offset;
|
||||
}
|
||||
|
||||
return $sql;
|
||||
}
|
||||
|
||||
// --------------------------------------------------------------------
|
||||
|
||||
/**
|
||||
* Close DB Connection
|
||||
*
|
||||
* @access public
|
||||
* @param resource
|
||||
* @return void
|
||||
*/
|
||||
function _close($conn_id)
|
||||
{
|
||||
@pg_close($conn_id);
|
||||
}
|
||||
|
||||
|
||||
}
|
||||
|
||||
|
||||
/* End of file postgre_driver.php */
|
||||
/* Location: ./system/database/drivers/postgre/postgre_driver.php */
|
||||
Reference in New Issue
Block a user