<?php
/* SVN FILE: $Id$ */
/**
 * MySQL layer for DBO
 *
 * Long description for file
 *
 * PHP versions 4 and 5
 *
 * CakePHP(tm) :  Rapid Development Framework <http://www.cakephp.org/>
 * Copyright 2005-2007, 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 2005-2007, 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			$Revision$
 * @modifiedby		$LastChangedBy$
 * @lastmodified	$Date$
 * @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 = "`";
/**
 * 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' => 'int(11) DEFAULT 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['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;
		}
		$tables = array();
		$result = mysql_list_tables($this->config['database'], $this->connection);

		if ($result) {
			while ($line = mysql_fetch_array($result)) {
				$tables[] = $line[0];
			}
		}

		if (empty($tables)) {
			$result = $this->query('SHOW TABLES');
			$key1 = $key2 = null;
			if ($result) {
				foreach ($result as $item) {
					if (empty($key1)) {
						$key1 = key($item);
						$key2 = key($item[$key1]);
					}
					$tables[] = $item[$key1][$key2];
				}
			}
		}

		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('DESC ' . $this->fullTableName($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[] = array(
					'name'		=> $column[0]['Field'],
					'type'		=> $this->column($column[0]['Type']),
					'null'		=> ($column[0]['Null'] == 'YES' ? true : false),
					'default'	=> $column[0]['Default'],
					'length'	=> $this->length($column[0]['Type'])
				);
			}
		}

		$this->__cacheDescription($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;
		}

		if ($data === null) {
			return 'NULL';
		}

		if($data === '') {
			return  "''";
		}

		switch ($column) {
			case 'boolean':
				$data = $this->boolean((bool)$data);
			break;
			case 'integer' :
			case 'float' :
			case null :
				if(is_numeric($data)) {
					break;
				}
			default:
				$data = "'" . mysql_real_escape_string($data, $this->connection) . "'";
			break;
		}

		return $data;
	}
/**
 * Begin a transaction
 *
 * @param unknown_type $model
 * @return boolean True on success, false on fail
 * (i.e. if the database/model does not support transactions).
 */
	function begin(&$model) {
		if (parent::begin($model)) {
			if ($this->execute('START TRANSACTION')) {
				$this->_transactionStarted = true;
				return true;
			}
		}
		return false;
	}
/**
 * Commit a transaction
 *
 * @param unknown_type $model
 * @return boolean True on success, false on fail
 * (i.e. if the database/model does not support transactions,
 * or a transaction has not started).
 */
	function commit(&$model) {
		if (parent::commit($model)) {
			$this->_transactionStarted = false;
			return $this->execute('COMMIT');
		}
		return false;
	}
/**
 * Rollback a transaction
 *
 * @param unknown_type $model
 * @return boolean True on success, false on fail
 * (i.e. if the database/model does not support transactions,
 * or a transaction has not started).
 */
	function rollback(&$model) {
		if (parent::rollback($model)) {
			return $this->execute('ROLLBACK');
		}
		return false;
	}
/**
 * Returns a formatted error message from previous database operation.
 *
 * @return string Error message with error number
 */
	function lastError() {
		if (mysql_errno($this->connection)) {
			return mysql_errno($this->connection).': '.mysql_error($this->connection);
		}
		return 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() {
		if ($this->_result) {
			return mysql_affected_rows($this->connection);
		}
		return null;
	}
/**
 * Returns number of rows in previous resultset. If no previous resultset exists,
 * this returns false.
 *
 * @return int Number of rows in resultset
 */
	function lastNumRows() {
		if ($this->_result and is_resource($this->_result)) {
			return @mysql_num_rows($this->_result);
		}
		return null;
	}
/**
 * Returns the ID generated from the previous INSERT operation.
 *
 * @param unknown_type $source
 * @return in
 */
	function lastInsertId($source = null) {
		$id = $this->fetchAll('SELECT LAST_INSERT_ID() AS insertID', false);
		if ($id !== false && !empty($id) && !empty($id[0]) && isset($id[0][0]['insertID'])) {
			return $id[0][0]['insertID'];
		}

		return null;
	}
/**
 * Converts database-layer column types to basic types
 *
 * @param string $real Real database-layer column type (i.e. "varchar(255)")
 * @return string Abstract column type (i.e. "string")
 */
	function column($real) {
		if (is_array($real)) {
			$col = $real['name'];
			if (isset($real['limit'])) {
				$col .= '('.$real['limit'].')';
			}
			return $col;
		}

		$col = r(')', '', $real);
		$limit = $this->length($real);
		@list($col) = explode('(', $col);

		if (in_array($col, array('date', 'time', 'datetime', 'timestamp'))) {
			return $col;
		}
		if ($col == 'tinyint' && $limit == 1) {
			return 'boolean';
		}
		if (strpos($col, 'int') !== false) {
			return 'integer';
		}
		if (strpos($col, 'char') !== false || $col == 'tinytext') {
			return 'string';
		}
		if (strpos($col, 'text') !== false) {
			return 'text';
		}
		if (strpos($col, 'blob') !== false) {
			return 'binary';
		}
		if (in_array($col, array('float', 'double', 'decimal'))) {
			return 'float';
		}
		if (strpos($col, 'enum') !== false) {
			return "enum($limit)";
		}
		if ($col == 'boolean') {
			return $col;
		}
		return 'text';
	}
/**
 * Gets the length of a database-native column description, or null if no length
 *
 * @param string $real Real database-layer column type (i.e. "varchar(255)")
 * @return int An integer representing the length of the column
 */
	function length($real) {
		$col = r(array(')', 'unsigned'), '', $real);
		$limit = null;

		if (strpos($col, '(') !== false) {
			list($col, $limit) = explode('(', $col);
		}

		if ($limit != null) {
			return intval($limit);
		}
		return null;
	}
/**
 * Enter description here...
 *
 * @param unknown_type $results
 */
	function resultSet(&$results) {
		$this->results =& $results;
		$this->map = array();
		$num_fields = mysql_num_fields($results);
		$index = 0;
		$j = 0;

		while ($j < $num_fields) {

			$column = mysql_fetch_field($results,$j);
			if (!empty($column->table)) {
				$this->map[$index++] = array($column->table, $column->name);
			} else {
				$this->map[$index++] = array(0, $column->name);
			}
			$j++;
		}
	}
/**
 * Fetches the next row from the current result set
 *
 * @return unknown
 */
	function fetchResult() {
		if ($row = mysql_fetch_row($this->results)) {
			$resultRow = array();
			$i = 0;
			foreach ($row as $index => $field) {
				list($table, $column) = $this->map[$index];
				$resultRow[$table][$column] = $row[$index];
				$i++;
			}
			return $resultRow;
		} else {
			return false;
		}
	}
/**
 * Sets the database encoding
 *
 * @param string $enc Database encoding
 * @return void
 */
	function setEncoding($enc) {
		return $this->_execute('SET NAMES ' . $enc) != false;
	}
/**
 * Gets the database encoding
 *
 * @return string The database encoding
 */
	function getEncoding() {
		return mysql_client_encoding($this->connection);
	}
/**
 * Generate a MySQL schema for the given Schema object
 *
 * @param object $schema An instance of a subclass of CakeSchema
 * @param string $table Optional.  If specified only the table name given will be generated.
 *                      Otherwise, all tables defined in the schema are generated.
 * @return string
 */
	function generateSchema($schema, $table = null) {
		if (!is_a($schema, 'CakeSchema')) {
			trigger_error(__('Invalid schema object'), E_USER_WARNING);
			return null;
		}
		$out = '';

		foreach ($schema->tables as $curTable => $columns) {
			if (empty($table) || $table == $curTable) {
				$out .= 'CREATE TABLE ' . $this->fullTableName($curTable) . " (\n";
				$colList = array();
				$primary = null;

				foreach ($columns as $col) {
					if (isset($col['key']) && $col['key'] == 'primary') {
						$primary = $col;
					}
					$colList[] = $this->generateColumnSchema($col);
				}
				if (empty($primary)) {
					$primary = array('id', 'integer', 'key' => 'primary');
					array_unshift($colList, $this->generateColumnSchema($primary));
				}
				$colList[] = 'PRIMARY KEY (' . $this->name($primary[0]) . ')';
				$out .= "\t" . join(",\n\t", $colList) . "\n);\n\n";
			}
		}
		return $out;
	}
/**
 * Generate a MySQL-native column schema string
 *
 * @param array $column An array structured like the following: array('name', 'type'[, options]),
 *                      where options can be 'default', 'length', or 'key'.
 * @return string
 */
	function generateColumnSchema($column) {
		$name = $type = null;
		$column = am(array('null' => true), $column);
		list($name, $type) = $column;

		if (empty($name) || empty($type)) {
			trigger_error('Column name or type not defined in schema', E_USER_WARNING);
			return null;
		}
		if (!isset($this->columns[$type])) {
			trigger_error("Column type {$type} does not exist", E_USER_WARNING);
			return null;
		}
		$real = $this->columns[$type];
		$out = $this->name($name) . ' ' . $real['name'];

		if (isset($real['limit']) || isset($real['length']) || isset($column['limit']) || isset($column['length'])) {
			if (isset($column['length'])) {
				$length = $column['length'];
			} elseif (isset($column['limit'])) {
				$length = $column['limit'];
			} elseif (isset($real['length'])) {
				$length = $real['length'];
			} else {
				$length = $real['limit'];
			}
			$out .= '(' . $length . ')';
		}

		if (isset($column['key']) && $column['key'] == 'primary') {
			$out .= ' NOT NULL AUTO_INCREMENT';
		} elseif (isset($column['default'])) {
			$out .= ' DEFAULT ' . $this->value($column['default'], $type);
		} elseif (isset($column['null']) && $column['null'] == true) {
			$out .= ' DEFAULT NULL';
		} elseif (isset($column['default']) && isset($column['null']) && $column['null'] == false) {
			$out .= ' DEFAULT ' . $this->value($column['default'], $type) . ' NOT NULL';
		} elseif (isset($column['null']) && $column['null'] == false) {
			$out .= ' NOT NULL';
		}
		return $out;
	}
/**
 * Enter description here...
 *
 * @param unknown_type $schema
 * @return unknown
 */
	function buildSchemaQuery($schema) {
		$search = array('{AUTOINCREMENT}', '{PRIMARY}', '{UNSIGNED}', '{FULLTEXT}',
						'{FULLTEXT_MYSQL}', '{BOOLEAN}', '{UTF_8}');
		$replace = array('int(11) not null auto_increment', 'primary key', 'unsigned',
						'FULLTEXT', 'FULLTEXT', 'enum (\'true\', \'false\') NOT NULL default \'true\'',
						'/*!40100 CHARACTER SET utf8 COLLATE utf8_unicode_ci */');
		$query = trim(r($search, $replace, $schema));
		return $query;
	}
}
?>