<?php
//////////////////////////////////////////////////////////////////////////
// + $Id$
// +------------------------------------------------------------------+ //
// + Cake PHP : Rapid Development Framework <http://www.cakephp.org/> + //
// + Copyright: (c) 2005, CakePHP Authors/Developers                  + //
// + Author(s): Michal Tatarynowicz aka Pies <tatarynowicz@gmail.com> + //
// +            Larry E. Masters aka PhpNut <nut@phpnut.com>          + //
// +            Kamil Dzielinski aka Brego <brego.dk@gmail.com>       + //
// +------------------------------------------------------------------+ //
// + Licensed under The MIT License                                   + //
// + Redistributions of files must retain the above copyright notice. + //
// + See: http://www.opensource.org/licenses/mit-license.php          + //
//////////////////////////////////////////////////////////////////////////

/**
 * SQLite layer for DBO
 * 
 * @filesource 
 * @author CakePHP Authors/Developers
 * @copyright Copyright (c) 2005, CakePHP Authors/Developers
 * @link https://trac.cakephp.org/wiki/Authors Authors/Developers
 * @package cake
 * @subpackage cake.libs.dbo
 * @since CakePHP v 0.9.0
 * @version $Revision$
 * @modifiedby $LastChangedBy$
 * @lastmodified $Date$
 * @license http://www.opensource.org/licenses/mit-license.php The MIT License
 */

/**
 * Include DBO.
 */
uses('dbo');

/**
 * SQLite layer for DBO.
 *
 * @package cake
  * @subpackage cake.libs.dbo
 * @since CakePHP v 0.9.0
 */
class DBO_SQLite extends DBO 
{

/**
 * Connects to the database using config['file'] as a filename.
 *
 * @param array $config Configuration array for connecting
 * @return mixed
 */
   function connect($config) 
   {
      if ($config) 
      {
         $this->config = $config;
         $this->_conn = sqlite_open($config['file']);
      }
      $this->connected = $this->_conn? true: false;

      if($this->connected)
      {
         return $this->_conn;
      }
      else
      {
         die('Could not connect to DB.');
      }
   }

/**
 * Disconnects from database.
 *
 * @return boolean True if the database could be disconnected, else false
 */
   function disconnect() 
   {
      return sqlite_close($this->_conn);
   }

/**
 * Executes given SQL statement.
 *
 * @param string $sql SQL statement
 * @return resource Result resource identifier
 */
   function execute($sql) 
   {
      return sqlite_query($this->_conn, $sql);
   }

/**
 * Returns a row from given resultset as an array .
 *
 * @return array The fetched row as an array
 */
   function fetchRow() 
   {
      return sqlite_fetch_array($this->_result);
   }

/**
 * Returns an array of tables in the database. If there are no tables, an error is raised and the application exits.
 *
 * @return array Array of tablenames in the database
 */
   function tablesList() 
   {
      $result = sqlite_query($this->_conn, "SELECT name FROM sqlite_master WHERE type='table' ORDER BY name;");

      if (!$result) 
      {
         trigger_error(ERROR_NO_TABLE_LIST, E_USER_NOTICE);
         exit;
      }
      else 
      {
         $tables = array();
         while ($line = sqlite_fetch_array($result)) 
         {
            $tables[] = $line[0];
         }
         return $tables;
      }
   }
   
/**
 * Returns an array of the fields in given table name.
 *
 * @param string $table_name Name of database table to inspect
 * @return array Fields in table. Keys are name and type
 */
   function fields($table_name)
   {
      $fields = false;
      $cols = sqlite_fetch_column_types($table_name, $this->_conn, SQLITE_ASSOC);

      foreach ($cols as $column => $type)
      {
         $fields[] = array('name'=>$column, 'type'=>$type);
      }

      return $fields;
   }

/**
 * Returns a quoted and escaped string of $data for use in an SQL statement.
 *
 * @param string $data String to be prepared for use in an SQL statement
 * @return string Quoted and escaped
 */
   function prepareValue($data)
   {
      return "'".sqlite_escape_string($data)."'";
   }

/**
 * Returns a formatted error message from previous database operation.
 *
 * @return string Error message
 */
   function lastError() 
   {
      return sqlite_last_error($this->_conn)? sqlite_last_error($this->_conn).': '.sqlite_error_string(sqlite_last_error($this->_conn)): null;
   }

/**
 * Returns number of affected rows in previous database operation. If no previous operation exists, this returns false.
 *
 * @return int Number of affected rows
 */
   function lastAffected()
   {
      return $this->_result? sqlite_changes($this->_conn): false;
   }

/**
 * Returns number of rows in previous resultset. If no previous resultset exists, 
 * this returns false.
 *
 * @return int Number of rows in resultset
 */
   function lastNumRows() 
   {
      return $this->_result? sqlite_num_rows($this->_result): false;
   }

/**
 * Returns the ID generated from the previous INSERT operation.
 *
 * @return int 
 */
   function lastInsertId() 
   {
      return sqlite_last_insert_rowid($this->_conn);
   }

/**
 * Returns a limit statement in the correct format for the particular database.
 *
 * @param int $limit Limit of results returned
 * @param int $offset Offset from which to start results
 * @return string SQL limit/offset statement
 */
   function selectLimit($limit, $offset=null)
   {
      return " LIMIT {$limit}".($offset? ", {$offset}": null);
   }

}

?>