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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 Oracle 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_oci_driver extends CI_DB_pdo_driver {
public $subdriver = 'oci';
/**
* The syntax to count rows is slightly different across different
* database engines, so this string appears in each driver and is
* used for the count_all() and count_all_results() functions.
*/
protected $_count_string = 'SELECT COUNT(1) AS ';
protected $_random_keyword = ' ASC'; // Currently not supported
protected $_reserved_identifiers = array('*', 'rownum');
/**
* Constructor
*
* Builds the DSN if not already set.
*
* @param array
* @return void
*/
public function __construct($params)
{
parent::__construct($params);
if (empty($this->dsn))
{
$this->dsn = 'oci:dbname=';
// Oracle has a slightly different PDO DSN format (Easy Connect),
// which also supports pre-defined DSNs.
if (empty($this->hostname) && empty($this->port))
{
$this->dsn .= $this->database;
}
else
{
$this->dsn .= '//'.(empty($this->hostname) ? 'localhost' : $this->hostname)
.(empty($this->port) ? '' : ':'.$this->port).'/';
empty($this->database) OR $this->dsn .= $this->database;
}
empty($this->char_set) OR $this->dsn .= ';charset='.$this->char_set;
}
elseif ( ! empty($this->char_set) && strpos($this->dsn, 'charset=', 4) === FALSE)
{
$this->dsn .= ';charset='.$this->char_set;
}
}
// --------------------------------------------------------------------
/**
* 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)
{
$sql = 'SELECT "TABLE_NAME" FROM "ALL_TABLES"';
if ($prefix_limit === TRUE && $this->dbprefix !== '')
{
return $sql.' WHERE "TABLE_NAME" LIKE \''.$this->escape_like_str($this->dbprefix)."%' "
.sprintf($this->_like_escape_str, $this->_like_escape_chr);
}
return $sql;
}
// --------------------------------------------------------------------
/**
* Show column query
*
* Generates a platform-specific query string so that the column names can be fetched
*
* @param string the table name
* @return string
*/
protected function _list_columns($table = '')
{
return 'SELECT "COLUMN_NAME" FROM "all_tab_columns" WHERE "TABLE_NAME" = '.$this->escape($table);
}
// --------------------------------------------------------------------
/**
* Field data query
*
* Generates a platform-specific query so that the column data can be retrieved
*
* @param string the table name
* @return string
*/
protected function _field_data($table)
{
return 'SELECT * FROM '.$this->protect_identifiers($table).' WHERE rownum = 1';
}
// --------------------------------------------------------------------
/**
* From Tables
*
* This function implicitly groups FROM tables so there is no confusion
* about operator precedence in harmony with SQL standards
*
* @param array
* @return string
*/
protected function _from_tables($tables)
{
return is_array($tables) ? implode(', ', $tables) : $tables;
}
// --------------------------------------------------------------------
/**
* Insert_batch statement
*
* @param string the table name
* @param array the insert keys
* @param array the insert values
* @return string
*/
protected function _insert_batch($table, $keys, $values)
{
$keys = implode(', ', $keys);
$sql = "INSERT ALL\n";
for ($i = 0, $c = count($values); $i < $c; $i++)
{
$sql .= ' INTO '.$table.' ('.$keys.') VALUES '.$values[$i]."\n";
}
return $sql.'SELECT * FROM dual';
}
// --------------------------------------------------------------------
/**
* Delete statement
*
* Generates a platform-specific delete string from the supplied data
*
* @param string the table name
* @param array the where clause
* @param array the like clause
* @param string the limit clause
* @return string
*/
protected function _delete($table, $where = array(), $like = array(), $limit = FALSE)
{
$conditions = array();
empty($where) OR $conditions[] = implode(' ', $where);
empty($like) OR $conditions[] = implode(' ', $like);
empty($limit) OR $conditions[] = 'rownum <= '.$limit;
return 'DELETE FROM '.$table.(count($conditions) > 0 ? ' WHERE '.implode(' AND ', $conditions) : '');
}
// --------------------------------------------------------------------
/**
* Limit string
*
* Generates a platform-specific LIMIT clause
*
* @param string the sql query string
* @param int the number of rows to limit the query to
* @param int the offset value
* @return string
*/
protected function _limit($sql, $limit, $offset)
{
return 'SELECT * FROM (SELECT inner_query.*, rownum rnum FROM ('.$sql.') inner_query WHERE rownum < '.($offset + $limit).')'
.($offset ? ' WHERE rnum >= '.$offset : '');
}
}
/* End of file pdo_oci_driver.php */
/* Location: ./system/database/drivers/pdo/subdrivers/pdo_oci_driver.php */
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