/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

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

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

 * @author		EllisLab Dev Team

 * @link		http://codeigniter.com

 * @since		Version 2.1.2

 * @filesource

 */

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

/**

 * PDO 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		EllisLab Dev Team

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

 */

class CI_DB_pdo_driver extends CI_DB {

	var $dbdriver = 'pdo';

	// the character used to excape - not necessary for PDO

	var $_escape_char = '';

	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;

	var $options = array();

	function __construct($params)

	{

		parent::__construct($params);

		// clause and character used for LIKE escape sequences

		if (strpos($this->hostname, 'mysql') !== FALSE)

		{

			$this->_like_escape_str = '';

			$this->_like_escape_chr = '';

			//Prior to this version, the charset can't be set in the dsn

			if(is_php('5.3.6'))

			{

				$this->hostname .= ";charset={$this->char_set}";

			}

			//Set the charset with the connection options

			$this->options['PDO::MYSQL_ATTR_INIT_COMMAND'] = "SET NAMES {$this->char_set}";

		}

		elseif (strpos($this->hostname, 'odbc') !== FALSE)

		{

			$this->_like_escape_str = " {escape '%s'} ";

			$this->_like_escape_chr = '!';

		}

		else

		{

			$this->_like_escape_str = " ESCAPE '%s' ";

			$this->_like_escape_chr = '!';

		}

		empty($this->database) OR $this->hostname .= ';dbname='.$this->database;

		$this->trans_enabled = FALSE;

		$this->_random_keyword = ' RND('.time().')'; // database specific random keyword

	}

	/**

	 * Non-persistent database connection

	 *

	 * @access	private called by the base class

	 * @return	resource

	 */

	function db_connect()

	{

		$this->options['PDO::ATTR_ERRMODE'] = PDO::ERRMODE_SILENT;

		return new PDO($this->hostname, $this->username, $this->password, $this->options);

	}

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

	/**

	 * Persistent database connection

	 *

	 * @access	private called by the base class

	 * @return	resource

	 */

	function db_pconnect()

	{

		$this->options['PDO::ATTR_ERRMODE'] = PDO::ERRMODE_SILENT;

		$this->options['PDO::ATTR_PERSISTENT'] = TRUE;

		return new PDO($this->hostname, $this->username, $this->password, $this->options);

	}

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

	/**

	 * 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 ($this->db->db_debug)

		{

			return $this->db->display_error('db_unsuported_feature');

		}

		return FALSE;

	}

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

	/**

	 * Select the database

	 *

	 * @access	private called by the base class

	 * @return	resource

	 */

	function db_select()

	{

		// Not needed for PDO

		return TRUE;

	}

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

	/**

	 * Set client character set

	 *

	 * @access	public

	 * @param	string

	 * @param	string

	 * @return	resource

	 */

	function db_set_charset($charset, $collation)

	{

		// @todo - add support if needed

		return TRUE;

	}

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

	/**

	 * Version number query string

	 *

	 * @access	public

	 * @return	string

	 */

	function _version()

	{

		return $this->conn_id->getAttribute(PDO::ATTR_CLIENT_VERSION);

	}

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

	/**

	 * Execute the query

	 *

	 * @access	private called by the base class

	 * @param	string	an SQL query

	 * @return	object

	 */

	function _execute($sql)

	{

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

		$result_id = $this->conn_id->prepare($sql);

		$result_id->execute();

		if (is_object($result_id))

		{

			if (is_numeric(stripos($sql, 'SELECT')))

			{

				$this->affect_rows = count($result_id->fetchAll());

				$result_id->execute();

			}

			else

			{

				$this->affect_rows = $result_id->rowCount();

			}

		}

		else

		{

			$this->affect_rows = 0;

		}

		return $result_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)

	{

		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.

		$this->_trans_failure = (bool) ($test_mode === TRUE);

		return $this->conn_id->beginTransaction();

	}

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

	/**

	 * 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;

		}

		$ret = $this->conn->commit();

		return $ret;

	}

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

	/**

	 * 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;

		}

		$ret = $this->conn_id->rollBack();

		return $ret;

	}

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

	/**

	 * 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;

		}

		//Escape the string

		$str = $this->conn_id->quote($str);

		//If there are duplicated quotes, trim them away

		if (strpos($str, "'") === 0)

		{

			$str = substr($str, 1, -1);

		}

		// escape LIKE condition wildcards

		if ($like === TRUE)

		{

			$str = str_replace(	array('%', '_', $this->_like_escape_chr),

								array($this->_like_escape_chr.'%', $this->_like_escape_chr.'_', $this->_like_escape_chr.$this->_like_escape_chr),

								$str);

		}

		return $str;

	}

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

	/**

	 * Affected Rows

	 *

	 * @access	public

	 * @return	integer

	 */

	function affected_rows()

	{

		return $this->affect_rows;

	}

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

	/**

	 * Insert ID

	 * 

	 * @access	public

	 * @return	integer

	 */

	function insert_id($name=NULL)

	{

		//Convenience method for postgres insertid

		if (strpos($this->hostname, 'pgsql') !== FALSE)

		{

			$v = $this->_version();

			$table	= func_num_args() > 0 ? func_get_arg(0) : NULL;

			if ($table == NULL && $v >= '8.1')

			{

				$sql='SELECT LASTVAL() as ins_id';

			}

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

			$row = $query->row();

			return $row->ins_id;

		}

		else

		{

			return $this->conn_id->lastInsertId($name);

		}

	}

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

	/**

	 * "Count All" query

	 *

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

	 * the specified database

	 *

	 * @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;

	}

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

	/**

	 * Show 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)

	{

		$sql = "SHOW TABLES FROM `".$this->database."`";

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

		{

			//$sql .= " LIKE '".$this->escape_like_str($this->dbprefix)."%' ".sprintf($this->_like_escape_str, $this->_like_escape_chr);

			return FALSE; // not currently supported

		}

		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 ".$table;

	}

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

	/**

	 * 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 TOP 1 FROM ".$table;

	}

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

	/**

	 * The error message string

	 *

	 * @access	private

	 * @return	string

	 */

	function _error_message()

	{

		$error_array = $this->conn_id->errorInfo();

		return $error_array[2];

	}

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

	/**

	 * The error message number

	 *

	 * @access	private

	 * @return	integer

	 */

	function _error_number()

	{

		return $this->conn_id->errorCode();

	}

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

	/**

	 * 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 (count($tables) == 1) ? $tables[0] : '('.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).")";

	}

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

	/**

	 * 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[] = $key." = ".$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 $this->_delete($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 (strpos($this->hostname, 'cubrid') !== FALSE || strpos($this->hostname, 'sqlite') !== FALSE)

		{

			if ($offset == 0)

			{

				$offset = '';

			}

			else

			{

				$offset .= ", ";

			}

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

		}

		else

		{

			$sql .= "LIMIT ".$limit;

			if ($offset > 0)

			{

				$sql .= " OFFSET ".$offset;

			}

			return $sql;

		}

	}

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

	/**

	 * Close DB Connection

	 *

	 * @access	public

	 * @param	resource

	 * @return	void

	 */

	function _close($conn_id)

	{

		$this->conn_id = null;

	}

}

/* End of file pdo_driver.php */

/* Location: ./system/database/drivers/pdo/pdo_driver.php */