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

/**

 * CodeIgniter

 *

 * An open source application development framework for PHP 4.3.2 or newer

 *

 * @package		CodeIgniter

 * @author		ExpressionEngine Dev Team

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

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

 * @link		http://codeigniter.com

 * @since		Version 1.0

 * @filesource

 */

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

/**

 * MySQL Utility Class

 *

 * @category	Database

 * @author		ExpressionEngine Dev Team

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

 */

class CI_DB_mysql_utility extends CI_DB_utility {

	/**

	 * List databases

	 *

	 * @access	private

	 * @return	bool

	 */

	function _list_databases()

	{

		return "SHOW DATABASES";

	}

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

	/**

	 * Optimize table query

	 *

	 * Generates a platform-specific query so that a table can be optimized

	 *

	 * @access	private

	 * @param	string	the table name

	 * @return	object

	 */

	function _optimize_table($table)

	{

		return "OPTIMIZE TABLE ".$this->db->_escape_identifiers($table);

	}

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

	/**

	 * Repair table query

	 *

	 * Generates a platform-specific query so that a table can be repaired

	 *

	 * @access	private

	 * @param	string	the table name

	 * @return	object

	 */

	function _repair_table($table)

	{

		return "REPAIR TABLE ".$this->db->_escape_identifiers($table);

	}

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

	/**

	 * MySQL Export

	 *

	 * @access	private

	 * @param	array	Preferences

	 * @return	mixed

	 */

	function _backup($params = array())

	{

		if (count($params) == 0)

		{

			return FALSE;

		}

		// Extract the prefs for simplicity

		extract($params);

		// Build the output

		$output = '';

		foreach ((array)$tables as $table)

		{

			// Is the table in the "ignore" list?

			if (in_array($table, (array)$ignore, TRUE))

			{

				continue;

			}

			// Get the table schema

			$query = $this->db->query("SHOW CREATE TABLE `".$this->db->database.'`.'.$table);

			// No result means the table name was invalid

			if ($query === FALSE)

			{

				continue;

			}

			// Write out the table schema

			$output .= '#'.$newline.'# TABLE STRUCTURE FOR: '.$table.$newline.'#'.$newline.$newline;

 			if ($add_drop == TRUE)

 			{

				$output .= 'DROP TABLE IF EXISTS '.$table.';'.$newline.$newline;

			}

			$i = 0;

			$result = $query->result_array();

			foreach ($result[0] as $val)

			{

				if ($i++ % 2)

				{

					$output .= $val.';'.$newline.$newline;

				}

			}

			// If inserts are not needed we're done...

			if ($add_insert == FALSE)

			{

				continue;

			}

			// Grab all the data from the current table

			$query = $this->db->query("SELECT * FROM $table");

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

			{

				continue;

			}

			// Fetch the field names and determine if the field is an

			// integer type.  We use this info to decide whether to

			// surround the data with quotes or not

			$i = 0;

			$field_str = '';

			$is_int = array();

			while ($field = mysql_fetch_field($query->result_id))

			{

				// Most versions of MySQL store timestamp as a string

				$is_int[$i] = (in_array(

										strtolower(mysql_field_type($query->result_id, $i)),

										array('tinyint', 'smallint', 'mediumint', 'int', 'bigint'), //, 'timestamp'),

										TRUE)

										) ? TRUE : FALSE;

				// Create a string of field names

				$field_str .= '`'.$field->name.'`, ';

				$i++;

			}

			// Trim off the end comma

			$field_str = preg_replace( "/, $/" , "" , $field_str);

			// Build the insert string

			foreach ($query->result_array() as $row)

			{

				$val_str = '';

				$i = 0;

				foreach ($row as $v)

				{

					// Is the value NULL?

					if ($v === NULL)

					{

						$val_str .= 'NULL';

					}

					else

					{

						// Escape the data if it's not an integer

						if ($is_int[$i] == FALSE)

						{

							$val_str .= $this->db->escape($v);

						}

						else

						{

							$val_str .= $v;

						}

					}

					// Append a comma

					$val_str .= ', ';

					$i++;

				}

				// Remove the comma at the end of the string

				$val_str = preg_replace( "/, $/" , "" , $val_str);

				// Build the INSERT string

				$output .= 'INSERT INTO '.$table.' ('.$field_str.') VALUES ('.$val_str.');'.$newline;

			}

			$output .= $newline.$newline;

		}

		return $output;

	}

	/**

	 *

	 * The functions below have been deprecated as of 1.6, and are only here for backwards

	 * compatibility.  They now reside in dbforge().  The use of dbutils for database manipulation

	 * is STRONGLY discouraged in favour if using dbforge.

	 *

	 */

	/**

	 * Create database

	 *

	 * @access	private

	 * @param	string	the database name

	 * @return	bool

	 */

	function _create_database($name)

	{

		return "CREATE DATABASE ".$name;

	}

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

	/**

	 * Drop database

	 *

	 * @access	private

	 * @param	string	the database name

	 * @return	bool

	 */

	function _drop_database($name)

	{

		return "DROP DATABASE ".$name;

	}

}

/* End of file mysql_utility.php */

/* Location: ./system/database/drivers/mysql/mysql_utility.php */