Cake php 1.3.1をphp7対応

new文の参照渡しやめる

$view =& new View($controller);
$view = new View($controller);

↑のように「=& new」を全て「=」に置換

Objectクラス、Stringクラスなどのクラス名修正

PHP7から組み込みの型名と同じ名前のクラスやインターフェースなどが禁止。具体的には以下で検索。全置換。

class Object  {
~
  function Object() {
↓
class CakeObject  {
~
  function CakeObject() {


if (!class_exists('Object')) {
↓
if (!class_exists('CakeObject')) {


extends Object {
↓
extends CakeObject {


class String {
↓
class StringCake {


String::
↓
StringCake::

mysql系関数をmysqliに変更

「dbo_mysqli.php」が元々あったのでそれを利用。呼び出し元がぱっと見わからなかったので、「dbo_mysqli.php」の中身を「dbo_mysql.php」に移植して対応。

↓移植後ソース

<?php
/**
 * MySQL layer for DBO
 *
 * PHP versions 4 and 5
 *
 * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
 * Copyright 2005-2010, Cake Software Foundation, Inc. (http://cakefoundation.org)
 *
 * Licensed under The MIT License
 * Redistributions of files must retain the above copyright notice.
 *
 * @copyright     Copyright 2005-2010, Cake Software Foundation, Inc. (http://cakefoundation.org)
 * @link          http://cakephp.org CakePHP(tm) Project
 * @package       cake
 * @subpackage    cake.cake.libs.model.datasources.dbo
 * @since         CakePHP(tm) v 0.10.5.1790
 * @license       MIT License (http://www.opensource.org/licenses/mit-license.php)
 */

/**
 * Provides common base for MySQL & MySQLi connections
 *
 * @package       cake
 * @subpackage    cake.cake.libs.model.datasources.dbo
 */
class DboMysqlBase extends DboSource {

/**
 * Description property.
 *
 * @var string
 */
    var $description = "MySQL DBO Base Driver";

/**
 * Start quote
 *
 * @var string
 */
    var $startQuote = "`";

/**
 * End quote
 *
 * @var string
 */
    var $endQuote = "`";

/**
 * use alias for update and delete. Set to true if version >= 4.1
 *
 * @var boolean
 * @access protected
 */
    var $_useAlias = true;

/**
 * Index of basic SQL commands
 *
 * @var array
 * @access protected
 */
    var $_commands = array(
        'begin'    => 'START TRANSACTION',
        'commit'   => 'COMMIT',
        'rollback' => 'ROLLBACK'
    );

/**
 * List of engine specific additional field parameters used on table creating
 *
 * @var array
 * @access public
 */
    var $fieldParameters = array(
        'charset' => array('value' => 'CHARACTER SET', 'quote' => false, 'join' => ' ', 'column' => false, 'position' => 'beforeDefault'),
        'collate' => array('value' => 'COLLATE', 'quote' => false, 'join' => ' ', 'column' => 'Collation', 'position' => 'beforeDefault'),
        'comment' => array('value' => 'COMMENT', 'quote' => true, 'join' => ' ', 'column' => 'Comment', 'position' => 'afterDefault')
    );

/**
 * List of table engine specific parameters used on table creating
 *
 * @var array
 * @access public
 */
    var $tableParameters = array(
        'charset' => array('value' => 'DEFAULT CHARSET', 'quote' => false, 'join' => '=', 'column' => 'charset'),
        'collate' => array('value' => 'COLLATE', 'quote' => false, 'join' => '=', 'column' => 'Collation'),
        'engine' => array('value' => 'ENGINE', 'quote' => false, 'join' => '=', 'column' => 'Engine')
    );

/**
 * 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')
    );

/**
 * 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;
    }
/**
 * 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);
        }

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

        if (!empty($conditions)) {
            $alias = $this->name($model->alias);
            if ($model->name == $model->alias) {
                $joins = implode(' ', $this->_getJoins($model));
            }
        }
        $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;
    }

/**
 * Sets the database encoding
 *
 * @param string $enc Database encoding
 */
    function setEncoding($enc) {
        return $this->_execute('SET NAMES ' . $enc) != false;
    }

/**
 * Returns an array of the indexes in given datasource 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);
        if ($table) {
            $indexes = $this->query('SHOW INDEX FROM ' . $table);
            if (isset($indexes[0]['STATISTICS'])) {
                $keys = Set::extract($indexes, '{n}.STATISTICS');
            } else {
                $keys = Set::extract($indexes, '{n}.0');
            }
            foreach ($keys as $i => $key) {
                if (!isset($index[$key['Key_name']])) {
                    $col = array();
                    $index[$key['Key_name']]['column'] = $key['Column_name'];
                    $index[$key['Key_name']]['unique'] = intval($key['Non_unique'] == 0);
                } else {
                    if (!is_array($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 array $compare Result of a CakeSchema::compare()
 * @return array Array of alter statements to make.
 */
    function alterSchema($compare, $table = null) {
        if (!is_array($compare)) {
            return false;
        }
        $out = '';
        $colList = array();
        foreach ($compare as $curTable => $types) {
            $indexes = $tableParameters = array();
            if (!$table || $table == $curTable) {
                $out .= 'ALTER TABLE ' . $this->fullTableName($curTable) . " \n";
                foreach ($types as $type => $column) {
                    if (isset($column['indexes'])) {
                        $indexes[$type] = $column['indexes'];
                        unset($column['indexes']);
                    }
                    if (isset($column['tableParameters'])) {
                        $tableParameters[$type] = $column['tableParameters'];
                        unset($column['tableParameters']);
                    }
                    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;
                    }
                }
                $colList = array_merge($colList, $this->_alterIndexes($curTable, $indexes));
                $colList = array_merge($colList, $this->_alterTableParameters($curTable, $tableParameters));
                $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;
    }

/**
 * Generate MySQL table parameter alteration statementes for a table.
 *
 * @param string $table Table to alter parameters for.
 * @param array $parameters Parameters to add & drop.
 * @return array Array of table property alteration statementes.
 * @todo Implement this method.
 */
    function _alterTableParameters($table, $parameters) {
        if (isset($parameters['change'])) {
            return $this->buildTableParameters($parameters['change']);
        }
        return array();
    }

/**
 * Generate MySQL index alteration statements for a table.
 *
 * @param string $table Table to alter indexes for
 * @param array $new Indexes to add and drop
 * @return array Index alteration statements
 */
    function _alterIndexes($table, $indexes) {
        $alter = array();
        if (isset($indexes['drop'])) {
            foreach($indexes['drop'] as $name => $value) {
                $out = 'DROP ';
                if ($name == 'PRIMARY') {
                    $out .= 'PRIMARY KEY';
                } else {
                    $out .= 'KEY ' . $name;
                }
                $alter[] = $out;
            }
        }
        if (isset($indexes['add'])) {
            foreach ($indexes['add'] as $name => $value) {
                $out = 'ADD ';
                if ($name == 'PRIMARY') {
                    $out .= 'PRIMARY ';
                    $name = null;
                } else {
                    if (!empty($value['unique'])) {
                        $out .= 'UNIQUE ';
                    }
                }
                if (is_array($value['column'])) {
                    $out .= 'KEY '. $name .' (' . implode(', ', array_map(array(&$this, 'name'), $value['column'])) . ')';
                } else {
                    $out .= 'KEY '. $name .' (' . $this->name($value['column']) . ')';
                }
                $alter[] = $out;
            }
        }
        return $alter;
    }

/**
 * 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)) {
            $fields = implode(', ', array_map(array(&$this, 'name'), $fields));
        }
        $values = implode(', ', $values);
        $this->query("INSERT INTO {$table} ({$fields}) VALUES {$values}");
    }
/**
 * Returns an detailed array of sources (tables) in the database.
 *
 * @param string $name Table name to get parameters 
 * @return array Array of tablenames in the database
 */
    function listDetailedSources($name = null) {
        $condition = '';
        if (is_string($name)) {
            $condition = ' LIKE ' . $this->value($name);
        }
        $result = $this->query('SHOW TABLE STATUS FROM ' . $this->name($this->config['database']) . $condition . ';');
        if (!$result) {
            return array();
        } else {
            $tables = array();
            foreach ($result as $row) {
                $tables[$row['TABLES']['Name']] = $row['TABLES'];
                if (!empty($row['TABLES']['Collation'])) {
                    $charset = $this->getCharsetName($row['TABLES']['Collation']);
                    if ($charset) {
                        $tables[$row['TABLES']['Name']]['charset'] = $charset;
                    }
                }
            }
            if (is_string($name)) {
                return $tables[$name];
            }
            return $tables;
        }
    }

/**
 * 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) || $col == 'boolean') {
            return 'boolean';
        }
        if (strpos($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 || $col == 'binary') {
            return 'binary';
        }
        if (strpos($col, 'float') !== false || strpos($col, 'double') !== false || strpos($col, 'decimal') !== false) {
            return 'float';
        }
        if (strpos($col, 'enum') !== false) {
            return "enum($vals)";
        }
        return 'text';
    }
}

class DboMysql extends DboMysqlBase {

    /**
    * Datasource Description
    *
    * @var string
    */
        var $description = "Mysqli DBO Driver";
    
    /**
    * Base configuration settings for Mysqli driver
    *
    * @var array
    */
        var $_baseConfig = array(
            'persistent' => true,
            'host' => 'localhost',
            'login' => 'root',
            'password' => '',
            'database' => 'cake',
            'port' => '3306'
        );
    
    /**
    * 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;
            $this->connected = false;
    
            if (is_numeric($config['port'])) {
                $config['socket'] = null;
            } else {
                $config['socket'] = $config['port'];
                $config['port'] = null;
            }
    
            $this->connection = mysqli_connect($config['host'], $config['login'], $config['password'], $config['database'], $config['port'], $config['socket']);
    
            if ($this->connection !== false) {
                $this->connected = true;
            }
    
            $this->_useAlias = (bool)version_compare(mysqli_get_server_info($this->connection), "4.1", ">=");
    
            if (!empty($config['encoding'])) {
                $this->setEncoding($config['encoding']);
            }
            return $this->connected;
        }
    
    /**
    * Check that MySQLi is installed/enabled
    *
    * @return boolean
    */
        function enabled() {
            return extension_loaded('mysqli');
        }
    /**
    * Disconnects from database.
    *
    * @return boolean True if the database could be disconnected, else false
    */
        function disconnect() {
            if (isset($this->results) && is_resource($this->results)) {
                mysqli_free_result($this->results);
            }
            $this->connected = !@mysqli_close($this->connection);
            return !$this->connected;
        }
    
    /**
    * Executes given SQL statement.
    *
    * @param string $sql SQL statement
    * @return resource Result resource identifier
    * @access protected
    */
        function _execute($sql) {
            if (preg_match('/^\s*call/i', $sql)) {
                return $this->_executeProcedure($sql);
            }
            return mysqli_query($this->connection, $sql);
        }
    
    /**
    * Executes given SQL statement (procedure call).
    *
    * @param string $sql SQL statement (procedure call)
    * @return resource Result resource identifier for first recordset
    * @access protected
    */
        function _executeProcedure($sql) {
            $answer = mysqli_multi_query($this->connection, $sql);
    
            $firstResult = mysqli_store_result($this->connection);
    
            if (mysqli_more_results($this->connection)) {
                while ($lastResult = mysqli_next_result($this->connection));
            }
            return $firstResult;
        }
    
    /**
    * 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();
            }
    
            $tables = array();
    
            while ($line = mysqli_fetch_row($result)) {
                $tables[] = $line[0];
            }
            parent::listSources($tables);
            return $tables;
        }
    
    /**
    * 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 || (is_array($data) && empty($data))) {
                return 'NULL';
            }
            if ($data === '' && $column !== 'integer' && $column !== 'float' && $column !== 'boolean') {
                return "''";
            }
            if (empty($column)) {
                $column = $this->introspectType($data);
            }
    
            switch ($column) {
                case 'boolean':
                    return $this->boolean((bool)$data);
                break;
                case 'integer' :
                case 'float' :
                case null :
                    if ($data === '') {
                        return 'NULL';
                    }
                    if ((is_int($data) || is_float($data) || $data === '0') || (
                        is_numeric($data) && strpos($data, ',') === false &&
                        $data[0] != '0' && strpos($data, 'e') === false)) {
                            return $data;
                        }
                default:
                    $data = "'" . mysqli_real_escape_string($this->connection, $data) . "'";
                break;
            }
    
            return $data;
        }
    
    /**
    * Returns a formatted error message from previous database operation.
    *
    * @return string Error message with error number
    */
        function lastError() {
            if (mysqli_errno($this->connection)) {
                return mysqli_errno($this->connection).': '.mysqli_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 ($this->_result) {
                return mysqli_affected_rows($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 ($this->hasResult()) {
                return mysqli_num_rows($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;
        }
    
    /**
    * Enter description here...
    *
    * @param unknown_type $results
    */
        function resultSet(&$results) {
            if (isset($this->results) && is_resource($this->results) && $this->results != $results) {
                mysqli_free_result($this->results);
            }
            $this->results =& $results;
            $this->map = array();
            $numFields = mysqli_num_fields($results);
            $index = 0;
            $j = 0;
            while ($j < $numFields) {
                $column = mysqli_fetch_field_direct($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 ($row = mysqli_fetch_row($this->results)) {
                $resultRow = array();
                foreach ($row as $index => $field) {
                    $table = $column = null;
                    if (count($this->map[$index]) === 2) {
                        list($table, $column) = $this->map[$index];
                    }
                    $resultRow[$table][$column] = $row[$index];
                }
                return $resultRow;
            }
            return false;
        }
    
    /**
    * Gets the database encoding
    *
    * @return string The database encoding
    */
        function getEncoding() {
            return mysqli_client_encoding($this->connection);
        }
    
    /**
    * Query charset by collation
    *
    * @param string $name Collation name
    * @return string Character set name
    */
        function getCharsetName($name) {
            if ((bool)version_compare(mysqli_get_server_info($this->connection), "5", ">=")) {
                $cols = $this->query('SELECT CHARACTER_SET_NAME FROM INFORMATION_SCHEMA.COLLATIONS WHERE COLLATION_NAME= ' . $this->value($name) . ';');
                if (isset($cols[0]['COLLATIONS']['CHARACTER_SET_NAME'])) {
                    return $cols[0]['COLLATIONS']['CHARACTER_SET_NAME'];
                }
            }
            return false;
        }
    
    /**
    * Checks if the result is valid
    *
    * @return boolean True if the result is valid, else false
    */
        function hasResult() {
            return is_object($this->_result);
        }
    }

/**
 * MySQL DBO driver object
 *
 * Provides connection and SQL generation for MySQL RDMS
 *
 * @package       cake
 * @subpackage    cake.cake.libs.model.datasources.dbo
 */
class DboMysql_ extends DboMysqlBase {

/**
 * Datasource description
 *
 * @var string
 */
    var $description = "MySQL DBO Driver";

/**
 * Base configuration settings for MySQL driver
 *
 * @var array
 */
    var $_baseConfig = array(
        'persistent' => true,
        'host' => 'localhost',
        'login' => 'root',
        'password' => '',
        'database' => 'cake',
        'port' => '3306'
    );

/**
 * 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;
        $this->connected = false;

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

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

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

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

        return $this->connected;
    }

/**
 * Check whether the MySQL extension is installed/loaded
 *
 * @return boolean
 */
    function enabled() {
        return extension_loaded('mysql');
    }
/**
 * Disconnects from database.
 *
 * @return boolean True if the database could be disconnected, else false
 */
    function disconnect() {
        if (isset($this->results) && is_resource($this->results)) {
            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 ($line = mysql_fetch_row($result)) {
                $tables[] = $line[0];
            }
            parent::listSources($tables);
            return $tables;
        }
    }

/**
 * 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 || (is_array($data) && empty($data))) {
            return 'NULL';
        }
        if ($data === '' && $column !== 'integer' && $column !== 'float' && $column !== 'boolean') {
            return  "''";
        }
        if (empty($column)) {
            $column = $this->introspectType($data);
        }

        switch ($column) {
            case 'boolean':
                return $this->boolean((bool)$data);
            break;
            case 'integer':
            case 'float':
                if ($data === '') {
                    return 'NULL';
                }
                if ((is_int($data) || is_float($data) || $data === '0') || (
                    is_numeric($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;
    }

/**
 * 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 ($this->hasResult()) {
            return mysql_num_rows($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;
    }

/**
 * Enter description here...
 *
 * @param unknown_type $results
 */
    function resultSet(&$results) {
        if (isset($this->results) && is_resource($this->results) && $this->results != $results) {
            mysql_free_result($this->results);
        }
        $this->results =& $results;
        $this->map = array();
        $numFields = mysql_num_fields($results);
        $index = 0;
        $j = 0;

        while ($j < $numFields) {
            $column = mysql_fetch_field($results, $j);
            if (!empty($column->table) && strpos($column->name, $this->virtualFieldSeparator) === false) {
                $this->map[$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;
        }
    }

/**
 * Gets the database encoding
 *
 * @return string The database encoding
 */
    function getEncoding() {
        return mysql_client_encoding($this->connection);
    }

/**
 * Query charset by collation
 *
 * @param string $name Collation name
 * @return string Character set name
 */
    function getCharsetName($name) {
        if ((bool)version_compare(mysql_get_server_info($this->connection), "5", ">=")) {
            $cols = $this->query('SELECT CHARACTER_SET_NAME FROM INFORMATION_SCHEMA.COLLATIONS WHERE COLLATION_NAME= ' . $this->value($name) . ';');
            if (isset($cols[0]['COLLATIONS']['CHARACTER_SET_NAME'])) {
                return $cols[0]['COLLATIONS']['CHARACTER_SET_NAME'];
            }
        }
        return false;
    }
}