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<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
* CodeIgniter
*
* An open source application development framework for PHP 5.2.4 or newer
*
* NOTICE OF LICENSE
*
* Licensed under the Open Software License version 3.0
*
* This source file is subject to the Open Software License (OSL 3.0) that is
* bundled with this package in the files license.txt / license.rst. It is
* also available through the world wide web at this URL:
* http://opensource.org/licenses/OSL-3.0
* If you did not receive a copy of the license and are unable to obtain it
* through the world wide web, please send an email to
* licensing@ellislab.com so we can send you a copy immediately.
*
* @package CodeIgniter
* @author EllisLab Dev Team
* @copyright Copyright (c) 2008 - 2012, EllisLab, Inc. (http://ellislab.com/)
* @license http://opensource.org/licenses/OSL-3.0 Open Software License (OSL 3.0)
* @link http://codeigniter.com
* @since Version 3.0.0
* @filesource
*/
/**
* PDO DBLIB Database Adapter Class
*
* Note: _DB is an extender class that the app controller
* creates dynamically based on whether the query builder
* class is being used or not.
*
* @package CodeIgniter
* @subpackage Drivers
* @category Database
* @author EllisLab Dev Team
* @link http://codeigniter.com/user_guide/database/
*/
class CI_DB_pdo_dblib_driver extends CI_DB_pdo_driver {
public $subdriver = 'dblib';
protected $_random_keyword = ' NEWID()';
protected $_quoted_identifier;
/**
* Constructor
*
* Builds the DSN if not already set.
*
* @param array
* @return void
*/
public function __construct($params)
{
parent::__construct($params);
if (empty($this->dsn))
{
$this->dsn = $params['subdriver'].':host='.(empty($this->hostname) ? '127.0.0.1' : $this->hostname);
if ( ! empty($this->port))
{
$this->dsn .= (DIRECTORY_SEPARATOR === '\\' ? ',' : ':').$this->port;
}
empty($this->database) OR $this->dsn .= ';dbname='.$this->database;
empty($this->char_set) OR $this->dsn .= ';charset='.$this->char_set;
empty($this->appname) OR $this->dsn .= ';appname='.$this->appname;
}
else
{
if ( ! empty($this->char_set) && strpos($this->dsn, 'charset=', 6) === FALSE)
{
$this->dsn .= ';charset='.$this->char_set;
}
$this->subdriver = 'dblib';
}
}
// --------------------------------------------------------------------
/**
* Non-persistent database connection
*
* @param bool
* @return object
*/
public function db_connect($persistent = FALSE)
{
$this->conn_id = parent::db_connect($persistent);
if ( ! is_object($this->conn_id))
{
return $this->conn_id;
}
// Determine how identifiers are escaped
$query = $this->query('SELECT CASE WHEN (@@OPTIONS | 256) = @@OPTIONS THEN 1 ELSE 0 END AS qi');
$query = $query->row_array();
$this->_quoted_identifier = empty($query) ? FALSE : (bool) $query['qi'];
$this->_escape_char = ($this->_quoted_identifier) ? '"' : array('[', ']');
return $this->conn_id;
}
// --------------------------------------------------------------------
/**
* Show table query
*
* Generates a platform-specific query string so that the table names can be fetched
*
* @param bool
* @return string
*/
protected function _list_tables($prefix_limit = FALSE)
{
return 'SELECT '.$this->escape_identifiers('name')
.' FROM '.$this->escape_identifiers('sysobjects')
.' WHERE '.$this->escape_identifiers('type')." = 'U'";
if ($prefix_limit === TRUE && $this->dbprefix !== '')
{
$sql .= ' AND '.$this->escape_identifiers('name')." LIKE '".$this->escape_like_str($this->dbprefix)."%' "
.sprintf($this->_like_escape_str, $this->_like_escape_chr);
}
return $sql.' ORDER BY '.$this->escape_identifiers('name');
}
// --------------------------------------------------------------------
/**
* Show column query
*
* Generates a platform-specific query string so that the column names can be fetched
*
* @param string the table name
* @return string
*/
protected function _list_columns($table = '')
{
return 'SELECT '.$this->escape_identifiers('column_name')
.' FROM '.$this->escape_identifiers('information_schema.columns')
.' WHERE '.$this->escape_identifiers('table_name').' = '.$this->escape($table);
}
// --------------------------------------------------------------------
/**
* From Tables
*
* This function implicitly groups FROM tables so there is no confusion
* about operator precedence in harmony with SQL standards
*
* @param array
* @return string
*/
protected function _from_tables($tables)
{
return is_array($tables) ? implode(', ', $tables) : $tables;
}
// --------------------------------------------------------------------
/**
* Update statement
*
* Generates a platform-specific update string from the supplied data
*
* @param string the table name
* @param array the update data
* @return string
*/
protected function _update($table, $values)
{
$this->qb_limit = FALSE;
$this->qb_orderby = array();
return parent::_update($table, $values);
}
// --------------------------------------------------------------------
/**
* Delete statement
*
* Generates a platform-specific delete string from the supplied data
*
* @param string the table name
* @return string
*/
protected function _delete($table)
{
if ($this->qb_limit)
{
return 'WITH ci_delete AS (SELECT TOP '.(int) $this->qb_limit.' * FROM '.$table.$this->_compile_wh('qb_where').') DELETE FROM ci_delete';
}
return parent::_delete($table);
}
// --------------------------------------------------------------------
/**
* Limit string
*
* Generates a platform-specific LIMIT clause
*
* @param string the sql query string
* @param int the number of rows to limit the query to
* @param int the offset value
* @return string
*/
protected function _limit($sql, $limit, $offset)
{
$limit = $offset + $limit;
// As of SQL Server 2005 (9.0.*) ROW_NUMBER() is supported,
// however an ORDER BY clause is required for it to work
if (version_compare($this->version(), '9', '>=') && $offset && ! empty($this->qb_orderby))
{
$orderby = 'ORDER BY '.implode(', ', $this->qb_orderby);
// We have to strip the ORDER BY clause
$sql = trim(substr($sql, 0, strrpos($sql, 'ORDER BY '.$orderby)));
return 'SELECT '.(count($this->qb_select) === 0 ? '*' : implode(', ', $this->qb_select))." FROM (\n"
.preg_replace('/^(SELECT( DISTINCT)?)/i', '\\1 ROW_NUMBER() OVER('.$orderby.') AS '.$this->escape_identifiers('CI_rownum').', ', $sql)
."\n) ".$this->escape_identifiers('CI_subquery')
."\nWHERE ".$this->escape_identifiers('CI_rownum').' BETWEEN '.((int) $offset + 1).' AND '.$limit;
}
return preg_replace('/(^\SELECT (DISTINCT)?)/i','\\1 TOP '.$limit.' ', $sql);
}
}
/* End of file pdo_dblib_driver.php */
/* Location: ./system/database/drivers/pdo/subdrivers/pdo_dblib_driver.php */
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