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620 lines
14 KiB
620 lines
14 KiB
<?php
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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
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*
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* This content is released under the MIT License (MIT)
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*
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* Copyright (c) 2014 - 2017, British Columbia Institute of Technology
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*
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* @package CodeIgniter
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* @author EllisLab Dev Team
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* @copyright Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)
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* @copyright Copyright (c) 2014 - 2017, British Columbia Institute of Technology (http://bcit.ca/)
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* @license http://opensource.org/licenses/MIT MIT License
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* @link https://codeigniter.com
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* @since Version 1.3.0
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* @filesource
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*/
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defined('BASEPATH') OR exit('No direct script access allowed');
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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 query builder
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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 EllisLab Dev Team
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* @link https://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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/**
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* Database driver
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*
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* @var string
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*/
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public $dbdriver = 'postgre';
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/**
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* Database schema
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*
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* @var string
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*/
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public $schema = 'public';
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// --------------------------------------------------------------------
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/**
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* ORDER BY random keyword
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*
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* @var array
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*/
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protected $_random_keyword = array('RANDOM()', 'RANDOM()');
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// --------------------------------------------------------------------
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/**
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* Class constructor
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*
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* Creates a DSN string to be used for db_connect() and db_pconnect()
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*
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* @param array $params
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* @return void
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*/
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public function __construct($params)
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{
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parent::__construct($params);
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if ( ! empty($this->dsn))
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{
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return;
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}
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$this->dsn === '' OR $this->dsn = '';
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if (strpos($this->hostname, '/') !== FALSE)
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{
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// If UNIX sockets are used, we shouldn't set a port
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$this->port = '';
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}
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$this->hostname === '' OR $this->dsn = 'host='.$this->hostname.' ';
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if ( ! empty($this->port) && ctype_digit($this->port))
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{
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$this->dsn .= 'port='.$this->port.' ';
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}
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if ($this->username !== '')
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{
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$this->dsn .= 'user='.$this->username.' ';
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/* An empty password is valid!
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*
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* $db['password'] = NULL must be done in order to ignore it.
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*/
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$this->password === NULL OR $this->dsn .= "password='".$this->password."' ";
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}
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$this->database === '' OR $this->dsn .= 'dbname='.$this->database.' ';
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/* We don't have these options as elements in our standard configuration
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* array, but they might be set by parse_url() if the configuration was
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* provided via string. Example:
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*
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* postgre://username:password@localhost:5432/database?connect_timeout=5&sslmode=1
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*/
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foreach (array('connect_timeout', 'options', 'sslmode', 'service') as $key)
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{
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if (isset($this->$key) && is_string($this->$key) && $this->$key !== '')
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{
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$this->dsn .= $key."='".$this->$key."' ";
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}
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}
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$this->dsn = rtrim($this->dsn);
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}
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// --------------------------------------------------------------------
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/**
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* Database connection
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*
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* @param bool $persistent
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* @return resource
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*/
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public function db_connect($persistent = FALSE)
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{
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$this->conn_id = ($persistent === TRUE)
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? pg_pconnect($this->dsn)
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: pg_connect($this->dsn);
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if ($this->conn_id !== FALSE)
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{
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if ($persistent === TRUE
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&& pg_connection_status($this->conn_id) === PGSQL_CONNECTION_BAD
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&& pg_ping($this->conn_id) === FALSE
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)
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{
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return FALSE;
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}
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empty($this->schema) OR $this->simple_query('SET search_path TO '.$this->schema.',public');
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}
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return $this->conn_id;
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}
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// --------------------------------------------------------------------
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/**
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* Reconnect
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*
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* Keep / reestablish the db connection if no queries have been
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* sent for a length of time exceeding the server's idle timeout
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*
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* @return void
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*/
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public function reconnect()
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{
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if (pg_ping($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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* Set client character set
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*
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* @param string $charset
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* @return bool
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*/
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protected function _db_set_charset($charset)
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{
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return (pg_set_client_encoding($this->conn_id, $charset) === 0);
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}
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// --------------------------------------------------------------------
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/**
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* Database version number
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*
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* @return string
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*/
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public function version()
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{
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if (isset($this->data_cache['version']))
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{
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return $this->data_cache['version'];
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}
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if ( ! $this->conn_id OR ($pg_version = pg_version($this->conn_id)) === FALSE)
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{
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return FALSE;
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}
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/* If PHP was compiled with PostgreSQL lib versions earlier
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* than 7.4, pg_version() won't return the server version
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* and so we'll have to fall back to running a query in
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* order to get it.
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*/
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return isset($pg_version['server'])
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? $this->data_cache['version'] = $pg_version['server']
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: parent::version();
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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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* @param string $sql an SQL query
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* @return resource
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*/
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protected function _execute($sql)
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{
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return pg_query($this->conn_id, $sql);
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}
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// --------------------------------------------------------------------
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/**
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* Begin Transaction
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*
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* @return bool
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*/
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protected function _trans_begin()
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{
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return (bool) pg_query($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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* @return bool
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*/
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protected function _trans_commit()
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{
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return (bool) pg_query($this->conn_id, 'COMMIT');
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}
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// --------------------------------------------------------------------
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/**
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* Rollback Transaction
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*
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* @return bool
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*/
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protected function _trans_rollback()
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{
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return (bool) pg_query($this->conn_id, 'ROLLBACK');
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}
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// --------------------------------------------------------------------
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/**
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* Determines if a query is a "write" type.
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*
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* @param string An SQL query string
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* @return bool
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*/
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public function is_write_type($sql)
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{
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if (preg_match('#^(INSERT|UPDATE).*RETURNING\s.+(\,\s?.+)*$#is', $sql))
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{
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return FALSE;
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}
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return parent::is_write_type($sql);
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}
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// --------------------------------------------------------------------
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/**
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* Platform-dependent string escape
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*
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* @param string
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* @return string
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*/
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protected function _escape_str($str)
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{
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return pg_escape_string($this->conn_id, $str);
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}
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// --------------------------------------------------------------------
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/**
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* "Smart" Escape String
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*
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* Escapes data based on type
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*
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* @param string $str
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* @return mixed
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*/
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public function escape($str)
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{
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if (is_php('5.4.4') && (is_string($str) OR (is_object($str) && method_exists($str, '__toString'))))
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{
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return pg_escape_literal($this->conn_id, $str);
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}
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elseif (is_bool($str))
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{
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return ($str) ? 'TRUE' : 'FALSE';
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}
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return parent::escape($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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* @return int
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*/
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public function affected_rows()
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{
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return pg_affected_rows($this->result_id);
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}
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// --------------------------------------------------------------------
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/**
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* Insert ID
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*
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* @return string
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*/
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public function insert_id()
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{
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$v = pg_version($this->conn_id);
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$v = isset($v['server']) ? $v['server'] : 0; // 'server' key is only available since PosgreSQL 7.4
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$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 ($table !== NULL)
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{
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if ($column !== NULL && $v >= '8.0')
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{
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$sql = 'SELECT pg_get_serial_sequence(\''.$table."', '".$column."') AS seq";
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$query = $this->query($sql);
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$query = $query->row();
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$seq = $query->seq;
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}
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else
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{
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// seq_name passed in table parameter
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$seq = $table;
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}
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$sql = 'SELECT CURRVAL(\''.$seq."') AS ins_id";
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}
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else
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{
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return pg_last_oid($this->result_id);
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}
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$query = $this->query($sql);
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$query = $query->row();
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return (int) $query->ins_id;
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}
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// --------------------------------------------------------------------
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/**
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* Show table query
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*
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* Generates a platform-specific query string so that the table names can be fetched
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*
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* @param bool $prefix_limit
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* @return string
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*/
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protected function _list_tables($prefix_limit = FALSE)
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{
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$sql = 'SELECT "table_name" FROM "information_schema"."tables" WHERE "table_schema" = \''.$this->schema."'";
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if ($prefix_limit !== FALSE && $this->dbprefix !== '')
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{
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return $sql.' AND "table_name" LIKE \''
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.$this->escape_like_str($this->dbprefix)."%' "
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.sprintf($this->_like_escape_str, $this->_like_escape_chr);
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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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* List column query
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*
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* Generates a platform-specific query string so that the column names can be fetched
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*
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* @param string $table
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* @return string
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*/
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protected function _list_columns($table = '')
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{
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return 'SELECT "column_name"
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FROM "information_schema"."columns"
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WHERE LOWER("table_name") = '.$this->escape(strtolower($table));
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}
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// --------------------------------------------------------------------
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/**
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* Returns an object with field data
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*
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* @param string $table
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* @return array
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*/
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public function field_data($table)
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{
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$sql = 'SELECT "column_name", "data_type", "character_maximum_length", "numeric_precision", "column_default"
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FROM "information_schema"."columns"
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WHERE LOWER("table_name") = '.$this->escape(strtolower($table));
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if (($query = $this->query($sql)) === FALSE)
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{
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return FALSE;
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}
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$query = $query->result_object();
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$retval = array();
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for ($i = 0, $c = count($query); $i < $c; $i++)
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{
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$retval[$i] = new stdClass();
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$retval[$i]->name = $query[$i]->column_name;
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$retval[$i]->type = $query[$i]->data_type;
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$retval[$i]->max_length = ($query[$i]->character_maximum_length > 0) ? $query[$i]->character_maximum_length : $query[$i]->numeric_precision;
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$retval[$i]->default = $query[$i]->column_default;
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}
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return $retval;
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}
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// --------------------------------------------------------------------
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/**
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* Error
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*
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* Returns an array containing code and message of the last
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* database error that has occurred.
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*
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* @return array
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*/
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public function error()
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{
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return array('code' => '', 'message' => pg_last_error($this->conn_id));
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}
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// --------------------------------------------------------------------
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/**
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* ORDER BY
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*
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* @param string $orderby
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* @param string $direction ASC, DESC or RANDOM
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* @param bool $escape
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* @return object
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*/
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public function order_by($orderby, $direction = '', $escape = NULL)
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{
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$direction = strtoupper(trim($direction));
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if ($direction === 'RANDOM')
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{
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if ( ! is_float($orderby) && ctype_digit((string) $orderby))
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{
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$orderby = ($orderby > 1)
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? (float) '0.'.$orderby
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: (float) $orderby;
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}
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if (is_float($orderby))
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{
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$this->simple_query('SET SEED '.$orderby);
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}
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$orderby = $this->_random_keyword[0];
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$direction = '';
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$escape = FALSE;
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}
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return parent::order_by($orderby, $direction, $escape);
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}
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// --------------------------------------------------------------------
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/**
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* Update statement
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*
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* Generates a platform-specific update string from the supplied data
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*
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* @param string $table
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* @param array $values
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* @return string
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*/
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protected function _update($table, $values)
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{
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$this->qb_limit = FALSE;
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$this->qb_orderby = array();
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return parent::_update($table, $values);
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}
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// --------------------------------------------------------------------
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/**
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* Update_Batch statement
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*
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* Generates a platform-specific batch update string from the supplied data
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*
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* @param string $table Table name
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* @param array $values Update data
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* @param string $index WHERE key
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* @return string
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*/
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protected function _update_batch($table, $values, $index)
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{
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$ids = array();
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foreach ($values as $key => $val)
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{
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$ids[] = $val[$index]['value'];
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foreach (array_keys($val) as $field)
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{
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if ($field !== $index)
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{
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$final[$val[$field]['field']][] = 'WHEN '.$val[$index]['value'].' THEN '.$val[$field]['value'];
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}
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}
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}
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$cases = '';
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foreach ($final as $k => $v)
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{
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$cases .= $k.' = (CASE '.$val[$index]['field']."\n"
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.implode("\n", $v)."\n"
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.'ELSE '.$k.' END), ';
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}
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$this->where($val[$index]['field'].' IN('.implode(',', $ids).')', NULL, FALSE);
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return 'UPDATE '.$table.' SET '.substr($cases, 0, -2).$this->_compile_wh('qb_where');
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}
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// --------------------------------------------------------------------
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/**
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* Delete statement
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*
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* Generates a platform-specific delete string from the supplied data
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*
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* @param string $table
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* @return string
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*/
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protected function _delete($table)
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{
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$this->qb_limit = FALSE;
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return parent::_delete($table);
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}
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// --------------------------------------------------------------------
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/**
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* LIMIT
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*
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* Generates a platform-specific LIMIT clause
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*
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* @param string $sql SQL Query
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* @return string
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*/
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protected function _limit($sql)
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{
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return $sql.' LIMIT '.$this->qb_limit.($this->qb_offset ? ' OFFSET '.$this->qb_offset : '');
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Close DB Connection
|
|
*
|
|
* @return void
|
|
*/
|
|
protected function _close()
|
|
{
|
|
pg_close($this->conn_id);
|
|
}
|
|
|
|
}
|