dbo_mysql.php

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<?php
/* SVN FILE: $Id: dbo_mysql.php 7118 2008-06-04 20:49:29Z gwoo $ */
/**
 * MySQL layer for DBO
 *
 * Long description for file
 *
 * PHP versions 4 and 5
 *
 * CakePHP(tm) :  Rapid Development Framework <http://www.cakephp.org/>
 * Copyright 2005-2008, Cake Software Foundation, Inc.
 *								1785 E. Sahara Avenue, Suite 490-204
 *								Las Vegas, Nevada 89104
 *
 * Licensed under The MIT License
 * Redistributions of files must retain the above copyright notice.
 *
 * @filesource
 * @copyright		Copyright 2005-2008, Cake Software Foundation, Inc.
 * @link				http://www.cakefoundation.org/projects/info/cakephp CakePHP(tm) Project
 * @package			cake
 * @subpackage		cake.cake.libs.model.datasources.dbo
 * @since			CakePHP(tm) v 0.10.5.1790
 * @version			$Revision: 7118 $
 * @modifiedby		$LastChangedBy: gwoo $
 * @lastmodified	$Date: 2008-06-04 13:49:29 -0700 (Wed, 04 Jun 2008) $
 * @license			http://www.opensource.org/licenses/mit-license.php The MIT License
 */

/**
 * Short description for class.
 *
 * Long description for class
 *
 * @package		cake
 * @subpackage	cake.cake.libs.model.datasources.dbo
 */
class DboMysql extends DboSource {
/**
 * Enter description here...
 *
 * @var unknown_type
 */
	var $description = "MySQL DBO Driver";
/**
 * Enter description here...
 *
 * @var unknown_type
 */
	var $startQuote = "`";
/**
 * Enter description here...
 *
 * @var unknown_type
 */
	var $endQuote = "`";
/**
 * Index of basic SQL commands
 *
 * @var array
 * @access protected
 */
	var $_commands = array(
		'begin'    => 'START TRANSACTION',
		'commit'   => 'COMMIT',
		'rollback' => 'ROLLBACK'
	);
/**
 * Base configuration settings for MySQL driver
 *
 * @var array
 */
	var $_baseConfig = array(
		'persistent' => true,
		'host' => 'localhost',
		'login' => 'root',
		'password' => '',
		'database' => 'cake',
		'port' => '3306',
		'connect' => 'mysql_pconnect'
	);
/**
 * MySQL column definition
 *
 * @var array
 */
	var $columns = array(
		'primary_key' => array('name' => 'NOT NULL AUTO_INCREMENT'),
		'string' => array('name' => 'varchar', 'limit' => '255'),
		'text' => array('name' => 'text'),
		'integer' => array('name' => 'int', 'limit' => '11', 'formatter' => 'intval'),
		'float' => array('name' => 'float', 'formatter' => 'floatval'),
		'datetime' => array('name' => 'datetime', 'format' => 'Y-m-d H:i:s', 'formatter' => 'date'),
		'timestamp' => array('name' => 'timestamp', 'format' => 'Y-m-d H:i:s', 'formatter' => 'date'),
		'time' => array('name' => 'time', 'format' => 'H:i:s', 'formatter' => 'date'),
		'date' => array('name' => 'date', 'format' => 'Y-m-d', 'formatter' => 'date'),
		'binary' => array('name' => 'blob'),
		'boolean' => array('name' => 'tinyint', 'limit' => '1')
	);
/**
 * Connects to the database using options in the given configuration array.
 *
 * @return boolean True if the database could be connected, else false
 */
	function connect() {
		$config = $this->config;
		$connect = $config['connect'];
		$this->connected = false;

		if (!$config['persistent']) {
			$this->connection = mysql_connect($config['host'] . ':' . $config['port'], $config['login'], $config['password'], true);
		} else {
			$this->connection = $connect($config['host'] . ':' . $config['port'], $config['login'], $config['password']);
		}

		if (mysql_select_db($config['database'], $this->connection)) {
			$this->connected = true;
		}

		if (isset($config['encoding']) && !empty($config['encoding'])) {
			$this->setEncoding($config['encoding']);
		}

		return $this->connected;
	}
/**
 * Disconnects from database.
 *
 * @return boolean True if the database could be disconnected, else false
 */
	function disconnect() {
		@mysql_free_result($this->results);
		$this->connected = !@mysql_close($this->connection);
		return !$this->connected;
	}
/**
 * Executes given SQL statement.
 *
 * @param string $sql SQL statement
 * @return resource Result resource identifier
 * @access protected
 */
	function _execute($sql) {
		return mysql_query($sql, $this->connection);
	}
/**
 * Returns an array of sources (tables) in the database.
 *
 * @return array Array of tablenames in the database
 */
	function listSources() {
		$cache = parent::listSources();
		if ($cache != null) {
			return $cache;
		}
		$result = $this->_execute('SHOW TABLES FROM ' . $this->name($this->config['database']) . ';');

		if (!$result) {
			return array();
		} else {
			$tables = array();

			while ($line = mysql_fetch_array($result)) {
				$tables[] = $line[0];
			}
			parent::listSources($tables);
			return $tables;
		}
	}
/**
 * Returns an array of the fields in given table name.
 *
 * @param string $tableName Name of database table to inspect
 * @return array Fields in table. Keys are name and type
 */
	function describe(&$model) {
		$cache = parent::describe($model);
		if ($cache != null) {
			return $cache;
		}
		$fields = false;
		$cols = $this->query('DESCRIBE ' . $this->fullTableName($model));

		foreach ($cols as $column) {
			$colKey = array_keys($column);
			if (isset($column[$colKey[0]]) && !isset($column[0])) {
				$column[0] = $column[$colKey[0]];
			}
			if (isset($column[0])) {
				$fields[$column[0]['Field']] = array(
					'type'		=> $this->column($column[0]['Type']),
					'null'		=> ($column[0]['Null'] == 'YES' ? true : false),
					'default'	=> $column[0]['Default'],
					'length'	=> $this->length($column[0]['Type']),
				);
				if(!empty($column[0]['Key']) && isset($this->index[$column[0]['Key']])) {
					$fields[$column[0]['Field']]['key']	= $this->index[$column[0]['Key']];
				}
			}
		}
		$this->__cacheDescription($this->fullTableName($model, false), $fields);
		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
 * @param string $column The column into which this data will be inserted
 * @param boolean $safe Whether or not numeric data should be handled automagically if no column data is provided
 * @return string Quoted and escaped data
 */
	function value($data, $column = null, $safe = false) {
		$parent = parent::value($data, $column, $safe);

		if ($parent != null) {
			return $parent;
		} elseif ($data === null) {
			return 'NULL';
		} elseif ($data === '') {
			return  "''";
		}
		if (empty($column)) {
			$column = $this->introspectType($data);
		}

		switch ($column) {
			case 'boolean':
				return $this->boolean((bool)$data);
			break;
			case 'integer':
			case 'float':
				if ((is_int($data) || is_float($data)) || (
					is_numeric($data) && strpos($data, ',') === false &&
					$data[0] != '0' && strpos($data, 'e') === false
				)) {
					return $data;
				}
			default:
				$data = "'" . mysql_real_escape_string($data, $this->connection) . "'";
			break;
		}
		return $data;
	}
/**
 * Generates and executes an SQL UPDATE statement for given model, fields, and values.
 *
 * @param Model $model
 * @param array $fields
 * @param array $values
 * @param mixed $conditions
 * @return array
 */
	function update(&$model, $fields = array(), $values = null, $conditions = null) {
		if ($values == null) {
			$combined = $fields;
		} else {
			$combined = array_combine($fields, $values);
		}

		$fields = $this->_prepareUpdateFields($model, $combined, empty($conditions), !empty($conditions));
		$fields = join(', ', $fields);
		$table = $this->fullTableName($model);
		$alias = $this->name($model->alias);
		$joins = implode(' ', $this->_getJoins($model));

		if (empty($conditions)) {
			$alias = $joins = false;
		}
		$conditions = $this->conditions($this->defaultConditions($model, $conditions, $alias), true, true, $model);

		if ($conditions === false) {
			return false;
		}

		if (!$this->execute($this->renderStatement('update', compact('table', 'alias', 'joins', 'fields', 'conditions')))) {
			$model->onError();
			return false;
		}
		return true;
	}
/**
 * Generates and executes an SQL DELETE statement for given id/conditions on given model.
 *
 * @param Model $model
 * @param mixed $conditions
 * @return boolean Success
 */
	function delete(&$model, $conditions = null) {
		$alias = $this->name($model->alias);