426 lines
9.6 KiB
PHP
426 lines
9.6 KiB
PHP
<?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 - 2019, 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 - 2019, British Columbia Institute of Technology (https://bcit.ca/)
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* @license https://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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* ODBC 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_odbc_driver extends CI_DB_driver {
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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 = 'odbc';
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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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* Identifier escape character
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*
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* Must be empty for ODBC.
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*
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* @var string
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*/
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protected $_escape_char = '';
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/**
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* ESCAPE statement string
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*
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* @var string
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*/
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protected $_like_escape_str = " {escape '%s'} ";
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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('RND()', 'RND(%d)');
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// --------------------------------------------------------------------
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/**
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* ODBC result ID resource returned from odbc_prepare()
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*
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* @var resource
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*/
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private $odbc_result;
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/**
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* Values to use with odbc_execute() for prepared statements
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*
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* @var array
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*/
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private $binds = array();
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// --------------------------------------------------------------------
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/**
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* Class constructor
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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($params);
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// Legacy support for DSN in the hostname field
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if (empty($this->dsn))
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{
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$this->dsn = $this->hostname;
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}
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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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* @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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return ($persistent === TRUE)
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? odbc_pconnect($this->dsn, $this->username, $this->password)
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: odbc_connect($this->dsn, $this->username, $this->password);
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}
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// --------------------------------------------------------------------
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/**
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* Compile Bindings
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*
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* @param string $sql SQL statement
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* @param array $binds An array of values to bind
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* @return string
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*/
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public function compile_binds($sql, $binds)
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{
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if (empty($binds) OR empty($this->bind_marker) OR strpos($sql, $this->bind_marker) === FALSE)
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{
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return $sql;
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}
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elseif ( ! is_array($binds))
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{
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$binds = array($binds);
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$bind_count = 1;
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}
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else
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{
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// Make sure we're using numeric keys
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$binds = array_values($binds);
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$bind_count = count($binds);
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}
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// We'll need the marker length later
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$ml = strlen($this->bind_marker);
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// Make sure not to replace a chunk inside a string that happens to match the bind marker
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if ($c = preg_match_all("/'[^']*'|\"[^\"]*\"/i", $sql, $matches))
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{
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$c = preg_match_all('/'.preg_quote($this->bind_marker, '/').'/i',
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str_replace($matches[0],
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str_replace($this->bind_marker, str_repeat(' ', $ml), $matches[0]),
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$sql, $c),
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$matches, PREG_OFFSET_CAPTURE);
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// Bind values' count must match the count of markers in the query
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if ($bind_count !== $c)
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{
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return $sql;
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}
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}
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elseif (($c = preg_match_all('/'.preg_quote($this->bind_marker, '/').'/i', $sql, $matches, PREG_OFFSET_CAPTURE)) !== $bind_count)
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{
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return $sql;
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}
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if ($this->bind_marker !== '?')
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{
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do
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{
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$c--;
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$sql = substr_replace($sql, '?', $matches[0][$c][1], $ml);
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}
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while ($c !== 0);
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}
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if (FALSE !== ($this->odbc_result = odbc_prepare($this->conn_id, $sql)))
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{
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$this->binds = array_values($binds);
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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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* 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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if ( ! isset($this->odbc_result))
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{
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return odbc_exec($this->conn_id, $sql);
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}
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elseif ($this->odbc_result === FALSE)
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{
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return FALSE;
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}
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if (TRUE === ($success = odbc_execute($this->odbc_result, $this->binds)))
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{
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// For queries that return result sets, return the result_id resource on success
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$this->is_write_type($sql) OR $success = $this->odbc_result;
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}
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$this->odbc_result = NULL;
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$this->binds = array();
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return $success;
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}
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// --------------------------------------------------------------------
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/**
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* Begin Transaction
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*
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* @return bool
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*/
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protected function _trans_begin()
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{
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return odbc_autocommit($this->conn_id, FALSE);
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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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if (odbc_commit($this->conn_id))
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{
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odbc_autocommit($this->conn_id, TRUE);
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return TRUE;
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}
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return FALSE;
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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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if (odbc_rollback($this->conn_id))
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{
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odbc_autocommit($this->conn_id, TRUE);
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return TRUE;
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}
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return FALSE;
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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($str)
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{
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$this->display_error('db_unsupported_feature');
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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 odbc_num_rows($this->result_id);
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}
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// --------------------------------------------------------------------
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/**
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* Insert ID
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*
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* @return bool
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*/
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public function insert_id()
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{
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return ($this->db_debug) ? $this->display_error('db_unsupported_feature') : FALSE;
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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 $sql." AND table_name LIKE '".$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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* Show 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 'SHOW COLUMNS FROM '.$table;
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}
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// --------------------------------------------------------------------
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/**
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* Field data query
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*
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* Generates a platform-specific query so that the column data can be retrieved
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*
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* @param string $table
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* @return string
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*/
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protected function _field_data($table)
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{
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return 'SELECT TOP 1 FROM '.$table;
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}
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// --------------------------------------------------------------------
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/**
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* Error
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*
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* Returns an array containing code and message of the last
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* database error that has occurred.
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*
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* @return array
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*/
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public function error()
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{
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return array('code' => odbc_error($this->conn_id), 'message' => odbc_errormsg($this->conn_id));
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}
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// --------------------------------------------------------------------
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/**
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* Close DB Connection
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*
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* @return void
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*/
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protected function _close()
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{
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odbc_close($this->conn_id);
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}
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}
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