<?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 2005-2008, 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			$Revision$
 * @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 = "`";
/**
 * 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')
	);
/**
 * use alias for update and delete. Set to true if version >= 4.1
 *
 * @var boolean
 */
	var $__useAlias = true;
/**
 * 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']);
		}

		$this->__useAlias = (bool)version_compare(mysql_get_server_info($this->connection), "4.1", ">=");

		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 || (is_array($data) && empty($data))) {
			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, $conditions = null) {
		if (!$this->__useAlias) {
			return parent::update($model, $fields, $values, $conditions);
		}

		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, $conditions = null) {
		if (!$this->__useAlias) {
			return parent::delete($model, $conditions);
		}
		$alias = $this->name($model->alias);
		$table = $this->fullTableName($model);
		$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('delete', compact('alias', 'table', 'joins', 'conditions'))) === false) {
			$model->onError();
			return false;
		}
		return true;
	}
/**
 * Returns a formatted error message from previous database operation.
 *
 * @return string Error message with error number
 */
	function lastError() {
		if (mysql_errno($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 integer 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 integer Number of rows in resultset
 */
	function lastNumRows() {
		if ($this->_result) {
			return @mysql_num_rows($this->_result);
		}
		return null;
	}
/**
 * Returns the ID generated from the previous INSERT operation.
 *
 * @param unknown_type $source
 * @return in
 */
	function lastInsertId($source = null) {
		$id = $this->fetchRow('SELECT LAST_INSERT_ID() AS insertID', false);
		if ($id !== false && !empty($id) && !empty($id[0]) && isset($id[0]['insertID'])) {
			return $id[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 = str_replace(')', '', $real);
		$limit = $this->length($real);
		if (strpos($col, '(') !== false) {
			list($col, $vals) = 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 || $col == 'binary') {
			return 'binary';
		}
		if (in_array($col, array('float', 'double', 'decimal'))) {
			return 'float';
		}
		if (strpos($col, 'enum') !== false) {
			return "enum($vals)";
		}
		if ($col == 'boolean') {
			return $col;
		}
		return 'text';
	}
/**
 * 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 $enc Database encoding
 */
	function setEncoding($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);
	}
/**
 * Inserts multiple values into a table
 *
 * @param string $table
 * @param string $fields
 * @param array $values
 */
	function insertMulti($table, $fields, $values) {
		$table = $this->fullTableName($table);
		if (is_array($fields)) {
			$fields = join(', ', array_map(array(&$this, 'name'), $fields));
		}
		$values = implode(', ', $values);
		$this->query("INSERT INTO {$table} ({$fields}) VALUES {$values}");
	}
/**
 * Returns an array of the indexes in given table name.
 *
 * @param string $model Name of model to inspect
 * @return array Fields in table. Keys are column and unique
 */
	function index($model) {
		$index = array();
		$table = $this->fullTableName($model, false);
		if($table) {
			$indexes = $this->query('SHOW INDEX FROM ' . $table);
			$keys = Set::extract($indexes, '{n}.STATISTICS');
			foreach ($keys as $i => $key) {
				if(!isset($index[$key['Key_name']])) {
					$index[$key['Key_name']]['column'] = $key['Column_name'];
					$index[$key['Key_name']]['unique'] = ife($key['Non_unique'] == 0, 1, 0);
				} else {
					if(!is_array($index[$key['Key_name']]['column'])) {
						$col[] = $index[$key['Key_name']]['column'];
					}
					$col[] = $key['Column_name'];
					$index[$key['Key_name']]['column'] = $col;
				}
			}
		}
		return $index;
	}
/**
 * Generate a MySQL Alter Table syntax for the given Schema comparison
 *
 * @param unknown_type $schema
 * @return unknown
 */
	function alterSchema($compare, $table = null) {
		if(!is_array($compare)) {
			return false;
		}
		$out = '';
		$colList = array();
		foreach($compare as $curTable => $types) {
			if (!$table || $table == $curTable) {
				$out .= 'ALTER TABLE ' . $this->fullTableName($curTable) . " \n";
				foreach($types as $type => $column) {
					switch($type) {
						case 'add':
							foreach($column as $field => $col) {
								$col['name'] = $field;
								$alter = 'ADD '.$this->buildColumn($col);
								if(isset($col['after'])) {
									$alter .= ' AFTER '. $this->name($col['after']);
								}
								$colList[] = $alter;
							}
						break;
						case 'drop':
							foreach($column as $field => $col) {
								$col['name'] = $field;
								$colList[] = 'DROP '.$this->name($field);
							}
						break;
						case 'change':
							foreach($column as $field => $col) {
								if(!isset($col['name'])) {
									$col['name'] = $field;
								}
								$colList[] = 'CHANGE '. $this->name($field).' '.$this->buildColumn($col);
							}
						break;
					}
				}
				$out .= "\t" . join(",\n\t", $colList) . ";\n\n";
			}
		}
		return $out;
	}
/**
 * Generate a MySQL "drop table" statement for the given Schema object
 *
 * @param object $schema An instance of a subclass of CakeSchema
 * @param string $table Optional.  If specified only the table name given will be generated.
 *                      Otherwise, all tables defined in the schema are generated.
 * @return string
 */
	function dropSchema($schema, $table = null) {
		if (!is_a($schema, 'CakeSchema')) {
			trigger_error(__('Invalid schema object', true), E_USER_WARNING);
			return null;
		}
		$out = '';
		foreach ($schema->tables as $curTable => $columns) {
			if (!$table || $table == $curTable) {
				$out .= 'DROP TABLE IF EXISTS ' . $this->fullTableName($curTable) . ";\n";
			}
		}
		return $out;
	}
}
?>