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<?php
/**
* CodeIgniter
*
* An open source application development framework for PHP
*
* This content is released under the MIT License (MIT)
*
* Copyright (c) 2014 - 2016, British Columbia Institute of Technology
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
* @package CodeIgniter
* @author EllisLab Dev Team
* @copyright Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)
* @copyright Copyright (c) 2014 - 2016, British Columbia Institute of Technology (http://bcit.ca/)
* @license http://opensource.org/licenses/MIT MIT License
* @link https://codeigniter.com
* @since Version 3.0.0
* @filesource
*/
defined('BASEPATH') OR exit('No direct script access allowed');
/**
* PDO ODBC Database Adapter Class
*
* Note: _DB is an extender class that the app controller
* creates dynamically based on whether the query builder
* class is being used or not.
*
* @package CodeIgniter
* @subpackage Drivers
* @category Database
* @author EllisLab Dev Team
* @link https://codeigniter.com/user_guide/database/
*/
class CI_DB_pdo_odbc_driver extends CI_DB_pdo_driver {
/**
* Sub-driver
*
* @var string
*/
public $subdriver = 'odbc';
/**
* Database schema
*
* @var string
*/
public $schema = 'public';
// --------------------------------------------------------------------
/**
* Identifier escape character
*
* Must be empty for ODBC.
*
* @var string
*/
protected $_escape_char = '';
/**
* ESCAPE statement string
*
* @var string
*/
protected $_like_escape_str = " {escape '%s'} ";
/**
* ORDER BY random keyword
*
* @var array
*/
protected $_random_keyword = array('RND()', 'RND(%d)');
// --------------------------------------------------------------------
/**
* Class constructor
*
* Builds the DSN if not already set.
*
* @param array $params
* @return void
*/
public function __construct($params)
{
parent::__construct($params);
if (empty($this->dsn))
{
$this->dsn = 'odbc:';
// Pre-defined DSN
if (empty($this->hostname) && empty($this->HOSTNAME) && empty($this->port) && empty($this->PORT))
{
if (isset($this->DSN))
{
$this->dsn .= 'DSN='.$this->DSN;
}
elseif ( ! empty($this->database))
{
$this->dsn .= 'DSN='.$this->database;
}
return;
}
// If the DSN is not pre-configured - try to build an IBM DB2 connection string
$this->dsn .= 'DRIVER='.(isset($this->DRIVER) ? '{'.$this->DRIVER.'}' : '{IBM DB2 ODBC DRIVER}').';';
if (isset($this->DATABASE))
{
$this->dsn .= 'DATABASE='.$this->DATABASE.';';
}
elseif ( ! empty($this->database))
{
$this->dsn .= 'DATABASE='.$this->database.';';
}
if (isset($this->HOSTNAME))
{
$this->dsn .= 'HOSTNAME='.$this->HOSTNAME.';';
}
else
{
$this->dsn .= 'HOSTNAME='.(empty($this->hostname) ? '127.0.0.1;' : $this->hostname.';');
}
if (isset($this->PORT))
{
$this->dsn .= 'PORT='.$this->port.';';
}
elseif ( ! empty($this->port))
{
$this->dsn .= ';PORT='.$this->port.';';
}
$this->dsn .= 'PROTOCOL='.(isset($this->PROTOCOL) ? $this->PROTOCOL.';' : 'TCPIP;');
}
}
// --------------------------------------------------------------------
/**
* Determines if a query is a "write" type.
*
* @param string An SQL query string
* @return bool
*/
public function is_write_type($sql)
{
if (preg_match('#^(INSERT|UPDATE).*RETURNING\s.+(\,\s?.+)*$#i', $sql))
{
return FALSE;
}
return parent::is_write_type($sql);
}
// --------------------------------------------------------------------
/**
* Show table query
*
* Generates a platform-specific query string so that the table names can be fetched
*
* @param bool $prefix_limit
* @return string
*/
protected function _list_tables($prefix_limit = FALSE)
{
$sql = "SELECT table_name FROM information_schema.tables WHERE table_schema = '".$this->schema."'";
if ($prefix_limit !== FALSE && $this->dbprefix !== '')
{
return $sql." AND table_name LIKE '".$this->escape_like_str($this->dbprefix)."%' "
.sprintf($this->_like_escape_str, $this->_like_escape_chr);
}
return $sql;
}
// --------------------------------------------------------------------
/**
* Show column query
*
* Generates a platform-specific query string so that the column names can be fetched
*
* @param string $table
* @return string
*/
protected function _list_columns($table = '')
{
return 'SELECT column_name FROM information_schema.columns WHERE table_name = '.$this->escape($table);
}
// --------------------------------------------------------------------
/**
* Update statement
*
* Generates a platform-specific update string from the supplied data
*
* @param string $table
* @param array $values
* @return string
*/
protected function _update($table, $values)
{
$this->qb_limit = FALSE;
$this->qb_orderby = array();
return parent::_update($table, $values);
}
// --------------------------------------------------------------------
/**
* Truncate statement
*
* Generates a platform-specific truncate string from the supplied data
*
* If the database does not support the TRUNCATE statement,
* then this method maps to 'DELETE FROM table'
*
* @param string $table
* @return string
*/
protected function _truncate($table)
{
return 'DELETE FROM '.$table;
}
// --------------------------------------------------------------------
/**
* Delete statement
*
* Generates a platform-specific delete string from the supplied data
*
* @param string the table name
* @return string
*/
protected function _delete($table)
{
$this->qb_limit = FALSE;
return parent::_delete($table);
}
// --------------------------------------------------------------------
/**
* LIMIT
*
* Generates a platform-specific LIMIT clause
*
* @param string $sql SQL Query
* @return string
*/
protected function _limit($sql)
{
return preg_replace('/(^\SELECT (DISTINCT)?)/i','\\1 TOP '.$this->qb_limit.' ', $sql);
}
}