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dbo_mysql.php

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<?php
/* SVN FILE: $Id: dbo__mysql_8php-source.html 580 2008-07-01 14:45:49Z 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: 580 $
 * @modifiedby      $LastChangedBy: gwoo $
 * @lastmodified    $Date: 2008-07-01 09:45:49 -0500 (Tue, 01 Jul 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')
    );
/**
 * 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);
        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;
    }
}
?>

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