/lenasys/trunk

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');

/**

 * CodeIgniter

 *

 * An open source application development framework for PHP 5.1.6 or newer

 *

 * @package		CodeIgniter

 * @author		Esen Sagynov

 * @copyright	Copyright (c) 2008 - 2011, EllisLab, Inc.

 * @license		http://codeigniter.com/user_guide/license.html

 * @link		http://codeigniter.com

 * @since		Version 2.0.2

 * @filesource

 */

// ------------------------------------------------------------------------

/**

 * CUBRID Database Adapter Class

 *

 * Note: _DB is an extender class that the app controller

 * creates dynamically based on whether the active record

 * class is being used or not.

 *

 * @package		CodeIgniter

 * @subpackage	Drivers

 * @category	Database

 * @author		Esen Sagynov

 * @link		http://codeigniter.com/user_guide/database/

 */

class CI_DB_cubrid_driver extends CI_DB {

	// Default CUBRID Broker port. Will be used unless user

	// explicitly specifies another one.

	const DEFAULT_PORT = 33000;

	var $dbdriver = 'cubrid';

	// The character used for escaping - no need in CUBRID

	var	$_escape_char = '';

	// clause and character used for LIKE escape sequences - not used in CUBRID

	var $_like_escape_str = '';

	var $_like_escape_chr = '';

	/**

	 * 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.

	 */

	var $_count_string = 'SELECT COUNT(*) AS ';

	var $_random_keyword = ' RAND()'; // database specific random keyword

	/**

	 * Non-persistent database connection

	 *

	 * @access	private called by the base class

	 * @return	resource

	 */

	function db_connect()

	{

		// If no port is defined by the user, use the default value

		if ($this->port == '')

		{

			$this->port = self::DEFAULT_PORT;

		}

		$conn = cubrid_connect($this->hostname, $this->port, $this->database, $this->username, $this->password);

		if ($conn)

		{

			// Check if a user wants to run queries in dry, i.e. run the

			// queries but not commit them.

			if (isset($this->auto_commit) && ! $this->auto_commit)

			{

				cubrid_set_autocommit($conn, CUBRID_AUTOCOMMIT_FALSE);

			}

			else

			{

				cubrid_set_autocommit($conn, CUBRID_AUTOCOMMIT_TRUE);

				$this->auto_commit = TRUE;

			}

		}

		return $conn;

	}

	// --------------------------------------------------------------------

	/**

	 * Persistent database connection

	 * In CUBRID persistent DB connection is supported natively in CUBRID

	 * engine which can be configured in the CUBRID Broker configuration

	 * file by setting the CCI_PCONNECT parameter to ON. In that case, all

	 * connections established between the client application and the

	 * server will become persistent. This is calling the same

	 * @cubrid_connect function will establish persisten connection

	 * considering that the CCI_PCONNECT is ON.

	 *

	 * @access	private called by the base class

	 * @return	resource

	 */

	function db_pconnect()

	{

		return $this->db_connect();

	}

	// --------------------------------------------------------------------

	/**

	 * Reconnect

	 *

	 * Keep / reestablish the db connection if no queries have been

	 * sent for a length of time exceeding the server's idle timeout

	 *

	 * @access	public

	 * @return	void

	 */

	function reconnect()

	{

		if (cubrid_ping($this->conn_id) === FALSE)

		{

			$this->conn_id = FALSE;

		}

	}

	// --------------------------------------------------------------------

	/**

	 * Select the database

	 *

	 * @access	private called by the base class

	 * @return	resource

	 */

	function db_select()

	{

		// In CUBRID there is no need to select a database as the database

		// is chosen at the connection time.

		// So, to determine if the database is "selected", all we have to

		// do is ping the server and return that value.

		return cubrid_ping($this->conn_id);

	}

	// --------------------------------------------------------------------

	/**

	 * Set client character set

	 *

	 * @access	public

	 * @param	string

	 * @param	string

	 * @return	resource

	 */

	function db_set_charset($charset, $collation)

	{

		// In CUBRID, there is no need to set charset or collation.

		// This is why returning true will allow the application continue

		// its normal process.

		return TRUE;

	}

	// --------------------------------------------------------------------

	/**

	 * Version number query string

	 *

	 * @access	public

	 * @return	string

	 */

	function _version()

	{

		// To obtain the CUBRID Server version, no need to run the SQL query.

		// CUBRID PHP API provides a function to determin this value.

		// This is why we also need to add 'cubrid' value to the list of

		// $driver_version_exceptions array in DB_driver class in

		// version() function.

		return cubrid_get_server_info($this->conn_id);

	}

	// --------------------------------------------------------------------

	/**

	 * Execute the query

	 *

	 * @access	private called by the base class

	 * @param	string	an SQL query

	 * @return	resource

	 */

	function _execute($sql)

	{

		$sql = $this->_prep_query($sql);

		return @cubrid_query($sql, $this->conn_id);

	}

	// --------------------------------------------------------------------

	/**

	 * Prep the query

	 *

	 * If needed, each database adapter can prep the query string

	 *

	 * @access	private called by execute()

	 * @param	string	an SQL query

	 * @return	string

	 */

	function _prep_query($sql)

	{

		// No need to prepare

		return $sql;

	}

	// --------------------------------------------------------------------

	/**

	 * Begin Transaction

	 *

	 * @access	public

	 * @return	bool

	 */

	function trans_begin($test_mode = FALSE)

	{

		if ( ! $this->trans_enabled)

		{

			return TRUE;

		}

		// When transactions are nested we only begin/commit/rollback the outermost ones

		if ($this->_trans_depth > 0)

		{

			return TRUE;

		}

		// Reset the transaction failure flag.

		// If the $test_mode flag is set to TRUE transactions will be rolled back

		// even if the queries produce a successful result.

		$this->_trans_failure = ($test_mode === TRUE) ? TRUE : FALSE;

		if (cubrid_get_autocommit($this->conn_id))

		{

			cubrid_set_autocommit($this->conn_id, CUBRID_AUTOCOMMIT_FALSE);

		}

		return TRUE;

	}

	// --------------------------------------------------------------------

	/**

	 * Commit Transaction

	 *

	 * @access	public

	 * @return	bool

	 */

	function trans_commit()

	{

		if ( ! $this->trans_enabled)

		{

			return TRUE;

		}

		// When transactions are nested we only begin/commit/rollback the outermost ones

		if ($this->_trans_depth > 0)

		{

			return TRUE;

		}

		cubrid_commit($this->conn_id);

		if ($this->auto_commit && ! cubrid_get_autocommit($this->conn_id))

		{

			cubrid_set_autocommit($this->conn_id, CUBRID_AUTOCOMMIT_TRUE);

		}

		return TRUE;

	}

	// --------------------------------------------------------------------

	/**

	 * Rollback Transaction

	 *

	 * @access	public

	 * @return	bool

	 */

	function trans_rollback()

	{

		if ( ! $this->trans_enabled)

		{

			return TRUE;

		}

		// When transactions are nested we only begin/commit/rollback the outermost ones

		if ($this->_trans_depth > 0)

		{

			return TRUE;

		}

		cubrid_rollback($this->conn_id);

		if ($this->auto_commit && ! cubrid_get_autocommit($this->conn_id))

		{

			cubrid_set_autocommit($this->conn_id, CUBRID_AUTOCOMMIT_TRUE);

		}

		return TRUE;

	}

	// --------------------------------------------------------------------

	/**

	 * Escape String

	 *

	 * @access	public

	 * @param	string

	 * @param	bool	whether or not the string will be used in a LIKE condition

	 * @return	string

	 */

	function escape_str($str, $like = FALSE)

	{

		if (is_array($str))

		{

			foreach ($str as $key => $val)

			{

				$str[$key] = $this->escape_str($val, $like);

			}

			return $str;

		}

		if (function_exists('cubrid_real_escape_string') AND is_resource($this->conn_id))

		{

			$str = cubrid_real_escape_string($str, $this->conn_id);

		}

		else

		{

			$str = addslashes($str);

		}

		// escape LIKE condition wildcards

		if ($like === TRUE)

		{

			$str = str_replace(array('%', '_'), array('\\%', '\\_'), $str);

		}

		return $str;

	}

	// --------------------------------------------------------------------

	/**

	 * Affected Rows

	 *

	 * @access	public

	 * @return	integer

	 */

	function affected_rows()

	{

		return @cubrid_affected_rows($this->conn_id);

	}

	// --------------------------------------------------------------------

	/**

	 * Insert ID

	 *

	 * @access	public

	 * @return	integer

	 */

	function insert_id()

	{

		return @cubrid_insert_id($this->conn_id);

	}

	// --------------------------------------------------------------------

	/**

	 * "Count All" query

	 *

	 * Generates a platform-specific query string that counts all records in

	 * the specified table

	 *

	 * @access	public

	 * @param	string

	 * @return	string

	 */

	function count_all($table = '')

	{

		if ($table == '')

		{

			return 0;

		}

		$query = $this->query($this->_count_string . $this->_protect_identifiers('numrows') . " FROM " . $this->_protect_identifiers($table, TRUE, NULL, FALSE));

		if ($query->num_rows() == 0)

		{

			return 0;

		}

		$row = $query->row();

		$this->_reset_select();

		return (int) $row->numrows;

	}

	// --------------------------------------------------------------------

	/**

	 * List table query

	 *

	 * Generates a platform-specific query string so that the table names can be fetched

	 *

	 * @access	private

	 * @param	boolean

	 * @return	string

	 */

	function _list_tables($prefix_limit = FALSE)

	{

		$sql = "SHOW TABLES";

		if ($prefix_limit !== FALSE AND $this->dbprefix != '')

		{

			$sql .= " LIKE '".$this->escape_like_str($this->dbprefix)."%'";

		}

		return $sql;

	}

	// --------------------------------------------------------------------

	/**

	 * Show column query

	 *

	 * Generates a platform-specific query string so that the column names can be fetched

	 *

	 * @access	public

	 * @param	string	the table name

	 * @return	string

	 */

	function _list_columns($table = '')

	{

		return "SHOW COLUMNS FROM ".$this->_protect_identifiers($table, TRUE, NULL, FALSE);

	}

	// --------------------------------------------------------------------

	/**

	 * Field data query

	 *

	 * Generates a platform-specific query so that the column data can be retrieved

	 *

	 * @access	public

	 * @param	string	the table name

	 * @return	object

	 */

	function _field_data($table)

	{

		return "SELECT * FROM ".$table." LIMIT 1";

	}

	// --------------------------------------------------------------------

	/**

	 * The error message string

	 *

	 * @access	private

	 * @return	string

	 */

	function _error_message()

	{

		return cubrid_error($this->conn_id);

	}

	// --------------------------------------------------------------------

	/**

	 * The error message number

	 *

	 * @access	private

	 * @return	integer

	 */

	function _error_number()

	{

		return cubrid_errno($this->conn_id);

	}

	// --------------------------------------------------------------------

	/**

	 * Escape the SQL Identifiers

	 *

	 * This function escapes column and table names

	 *

	 * @access	private

	 * @param	string

	 * @return	string

	 */

	function _escape_identifiers($item)

	{

		if ($this->_escape_char == '')

		{

			return $item;

		}

		foreach ($this->_reserved_identifiers as $id)

		{

			if (strpos($item, '.'.$id) !== FALSE)

			{

				$str = $this->_escape_char. str_replace('.', $this->_escape_char.'.', $item);

				// remove duplicates if the user already included the escape

				return preg_replace('/['.$this->_escape_char.']+/', $this->_escape_char, $str);

			}

		}

		if (strpos($item, '.') !== FALSE)

		{

			$str = $this->_escape_char.str_replace('.', $this->_escape_char.'.'.$this->_escape_char, $item).$this->_escape_char;

		}

		else

		{

			$str = $this->_escape_char.$item.$this->_escape_char;

		}

		// remove duplicates if the user already included the escape

		return preg_replace('/['.$this->_escape_char.']+/', $this->_escape_char, $str);

	}

	// --------------------------------------------------------------------

	/**

	 * From Tables

	 *

	 * This function implicitly groups FROM tables so there is no confusion

	 * about operator precedence in harmony with SQL standards

	 *

	 * @access	public

	 * @param	type

	 * @return	type

	 */

	function _from_tables($tables)

	{

		if ( ! is_array($tables))

		{

			$tables = array($tables);

		}

		return '('.implode(', ', $tables).')';

	}

	// --------------------------------------------------------------------

	/**

	 * Insert statement

	 *

	 * Generates a platform-specific insert string from the supplied data

	 *

	 * @access	public

	 * @param	string	the table name

	 * @param	array	the insert keys

	 * @param	array	the insert values

	 * @return	string

	 */

	function _insert($table, $keys, $values)

	{

		return "INSERT INTO ".$table." (\"".implode('", "', $keys)."\") VALUES (".implode(', ', $values).")";

	}

	// --------------------------------------------------------------------

	/**

	 * Replace statement

	 *

	 * Generates a platform-specific replace string from the supplied data

	 *

	 * @access	public

	 * @param	string	the table name

	 * @param	array	the insert keys

	 * @param	array	the insert values

	 * @return	string

	 */

	function _replace($table, $keys, $values)

	{

		return "REPLACE INTO ".$table." (\"".implode('", "', $keys)."\") VALUES (".implode(', ', $values).")";

	}

	// --------------------------------------------------------------------

	/**

	 * Insert_batch statement

	 *

	 * Generates a platform-specific insert string from the supplied data

	 *

	 * @access	public

	 * @param	string	the table name

	 * @param	array	the insert keys

	 * @param	array	the insert values

	 * @return	string

	 */

	function _insert_batch($table, $keys, $values)

	{

		return "INSERT INTO ".$table." (\"".implode('", "', $keys)."\") VALUES ".implode(', ', $values);

	}

	// --------------------------------------------------------------------

	/**

	 * Update statement

	 *

	 * Generates a platform-specific update string from the supplied data

	 *

	 * @access	public

	 * @param	string	the table name

	 * @param	array	the update data

	 * @param	array	the where clause

	 * @param	array	the orderby clause

	 * @param	array	the limit clause

	 * @return	string

	 */

	function _update($table, $values, $where, $orderby = array(), $limit = FALSE)

	{

		foreach ($values as $key => $val)

		{

			$valstr[] = sprintf('"%s" = %s', $key, $val);

		}

		$limit = ( ! $limit) ? '' : ' LIMIT '.$limit;

		$orderby = (count($orderby) >= 1)?' ORDER BY '.implode(", ", $orderby):'';

		$sql = "UPDATE ".$table." SET ".implode(', ', $valstr);

		$sql .= ($where != '' AND count($where) >=1) ? " WHERE ".implode(" ", $where) : '';

		$sql .= $orderby.$limit;

		return $sql;

	}

	// --------------------------------------------------------------------

	/**

	 * Update_Batch statement

	 *

	 * Generates a platform-specific batch update string from the supplied data

	 *

	 * @access	public

	 * @param	string	the table name

	 * @param	array	the update data

	 * @param	array	the where clause

	 * @return	string

	 */

	function _update_batch($table, $values, $index, $where = NULL)

	{

		$ids = array();

		$where = ($where != '' AND count($where) >=1) ? implode(" ", $where).' AND ' : '';

		foreach ($values as $key => $val)

		{

			$ids[] = $val[$index];

			foreach (array_keys($val) as $field)

			{

				if ($field != $index)

				{

					$final[$field][] = 'WHEN '.$index.' = '.$val[$index].' THEN '.$val[$field];

				}

			}

		}

		$sql = "UPDATE ".$table." SET ";

		$cases = '';

		foreach ($final as $k => $v)

		{

			$cases .= $k.' = CASE '."\n";

			foreach ($v as $row)

			{

				$cases .= $row."\n";

			}

			$cases .= 'ELSE '.$k.' END, ';

		}

		$sql .= substr($cases, 0, -2);

		$sql .= ' WHERE '.$where.$index.' IN ('.implode(',', $ids).')';

		return $sql;

	}

	// --------------------------------------------------------------------

	/**

	 * Truncate statement

	 *

	 * Generates a platform-specific truncate string from the supplied data

	 * If the database does not support the truncate() command

	 * This function maps to "DELETE FROM table"

	 *

	 * @access	public

	 * @param	string	the table name

	 * @return	string

	 */

	function _truncate($table)

	{

		return "TRUNCATE ".$table;

	}

	// --------------------------------------------------------------------

	/**

	 * Delete statement

	 *

	 * Generates a platform-specific delete string from the supplied data

	 *

	 * @access	public

	 * @param	string	the table name

	 * @param	array	the where clause

	 * @param	string	the limit clause

	 * @return	string

	 */

	function _delete($table, $where = array(), $like = array(), $limit = FALSE)

	{

		$conditions = '';

		if (count($where) > 0 OR count($like) > 0)

		{

			$conditions = "\nWHERE ";

			$conditions .= implode("\n", $this->ar_where);

			if (count($where) > 0 && count($like) > 0)

			{

				$conditions .= " AND ";

			}

			$conditions .= implode("\n", $like);

		}

		$limit = ( ! $limit) ? '' : ' LIMIT '.$limit;

		return "DELETE FROM ".$table.$conditions.$limit;

	}

	// --------------------------------------------------------------------

	/**

	 * Limit string

	 *

	 * Generates a platform-specific LIMIT clause

	 *

	 * @access	public

	 * @param	string	the sql query string

	 * @param	integer	the number of rows to limit the query to

	 * @param	integer	the offset value

	 * @return	string

	 */

	function _limit($sql, $limit, $offset)

	{

		if ($offset == 0)

		{

			$offset = '';

		}

		else

		{

			$offset .= ", ";

		}

		return $sql."LIMIT ".$offset.$limit;

	}

	// --------------------------------------------------------------------

	/**

	 * Close DB Connection

	 *

	 * @access	public

	 * @param	resource

	 * @return	void

	 */

	function _close($conn_id)

	{

		@cubrid_close($conn_id);

	}

}

/* End of file cubrid_driver.php */

/* Location: ./system/database/drivers/cubrid/cubrid_driver.php */