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datasource.php

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<?php
/* SVN FILE: $Id: datasource_8php-source.html 580 2008-07-01 14:45:49Z gwoo $ */
/**
 * DataSource base class
 *
 * 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
 * @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
 */
/**
 * DataSource base class
 *
 * Long description for file
 *
 * @package     cake
 * @subpackage  cake.cake.libs.model.datasources
 */
class DataSource extends Object {
/**
 * Are we connected to the DataSource?
 *
 * @var boolean
 * @access public
 */
    var $connected = false;
/**
 * Print full query debug info?
 *
 * @var boolean
 * @access public
 */
    var $fullDebug = false;
/**
 * Error description of last query
 *
 * @var unknown_type
 * @access public
 */
    var $error = null;
/**
 * String to hold how many rows were affected by the last SQL operation.
 *
 * @var string
 * @access public
 */
    var $affected = null;
/**
 * Number of rows in current resultset
 *
 * @var int
 * @access public
 */
    var $numRows = null;
/**
 * Time the last query took
 *
 * @var int
 * @access public
 */
    var $took = null;
/**
 * Enter description here...
 *
 * @var array
 * @access private
 */
    var $_result = null;
/**
 * Queries count.
 *
 * @var int
 * @access private
 */
    var $_queriesCnt = 0;
/**
 * Total duration of all queries.
 *
 * @var unknown_type
 * @access private
 */
    var $_queriesTime = null;
/**
 * Log of queries executed by this DataSource
 *
 * @var unknown_type
 * @access private
 */
    var $_queriesLog = array();
/**
 * Maximum number of items in query log, to prevent query log taking over
 * too much memory on large amounts of queries -- I we've had problems at
 * >6000 queries on one system.
 *
 * @var int Maximum number of queries in the queries log.
 * @access private
 */
    var $_queriesLogMax = 200;
/**
 * Caches serialzed results of executed queries
 *
 * @var array Maximum number of queries in the queries log.
 * @access private
 */
    var $_queryCache = array();
/**
 * The default configuration of a specific DataSource
 *
 * @var array
 * @access public
 */
    var $_baseConfig = array();
/**
 * Holds references to descriptions loaded by the DataSource
 *
 * @var array
 * @access private
 */
    var $__descriptions = array();
/**
 * Holds a list of sources (tables) contained in the DataSource
 *
 * @var array
 * @access protected
 */
    var $_sources = null;
/**
 * A reference to the physical connection of this DataSource
 *
 * @var array
 * @access public
 */
    var $connection = null;
/**
 * The DataSource configuration
 *
 * @var array
 * @access public
 */
    var $config = array();
/**
 * The DataSource configuration key name
 *
 * @var string
 * @access public
 */
    var $configKeyName = null;
/**
 * Whether or not this DataSource is in the middle of a transaction
 *
 * @var boolean
 * @access protected
 */
    var $_transactionStarted = false;
/**
 * Whether or not source data like available tables and schema descriptions
 * should be cached
 *
 * @var boolean
 */
    var $cacheSources = true;
/**
 * Constructor.
 */
    function __construct() {
        parent::__construct();
        if (func_num_args() > 0) {
            $this->setConfig(func_get_arg(0));
        }
    }
/**
 * Caches/returns cached results for child instances
 *
 * @return array
 */
    function listSources($data = null) {
        if ($this->cacheSources === false) {
            return null;
        }
        if ($this->_sources != null) {
            return $this->_sources;
        }

        if (Configure::read() > 0) {
            $expires = "+30 seconds";
        } else {
            $expires = "+999 days";
        }

        $key = ConnectionManager::getSourceName($this) . '_' . Inflector::slug($this->config['database']) . '_list';
        $sources = Cache::read($key, '_cake_model_');

        if ($sources == null) {
            $sources = $data;
            Cache::write($key, $data, array('duration' => $expires, 'config' => '_cake_model_'));
        }

        $this->_sources = $sources;
        return $sources;
    }
/**
 * Convenience method for DboSource::listSources().  Returns source names in lowercase.
 *
 * @return array
 */
    function sources() {
        $return = array_map('strtolower', $this->listSources());
        return $return;
    }
/**
 * Returns a Model description (metadata) or null if none found.
 *
 * @param Model $model
 * @return mixed
 */
    function describe($model) {
        if ($this->cacheSources === false) {
            return null;
        }
        if (isset($this->__descriptions[$model->tablePrefix . $model->table])) {
            return $this->__descriptions[$model->tablePrefix . $model->table];
        }
        $cache = $this->__cacheDescription($model->tablePrefix . $model->table);

        if ($cache !== null) {
            $this->__descriptions[$model->tablePrefix . $model->table] =& $cache;
            return $cache;
        }
        return null;
    }
/**
 * Begin a transaction
 *
 * @return boolean Returns true if a transaction is not in progress
 */
    function begin(&$model) {
        return !$this->_transactionStarted;
    }
/**
 * Commit a transaction
 *
 * @return boolean Returns true if a transaction is in progress
 */
    function commit(&$model) {
        return $this->_transactionStarted;
    }
/**
 * Rollback a transaction
 *
 * @return boolean Returns true if a transaction is in progress
 */
    function rollback(&$model) {
        return $this->_transactionStarted;
    }
/**
 * Converts column types to basic types
 *
 * @param string $real Real  column type (i.e. "varchar(255)")
 * @return string Abstract column type (i.e. "string")
 */
    function column($real) {
        return false;
    }
/**
 * To-be-overridden in subclasses.
 *
 * @param unknown_type $model
 * @param unknown_type $fields
 * @param unknown_type $values
 * @return unknown
 */
    function create(&$model, $fields = null, $values = null) {
        return false;
    }
/**
 * To-be-overridden in subclasses.
 *
 * @param unknown_type $model
 * @param unknown_type $queryData
 * @return unknown
 */
    function read(&$model, $queryData = array()) {
        return false;
    }
/**
 * To-be-overridden in subclasses.
 *
 * @param unknown_type $model
 * @param unknown_type $fields
 * @param unknown_type $values
 * @return unknown
 */
    function update(&$model, $fields = null, $values = null) {
        return false;
    }
/**
 * To-be-overridden in subclasses.
 *
 * @param unknown_type $model
 * @param unknown_type $id
 */
    function delete(&$model, $id = null) {
        if ($id == null) {
            $id = $model->id;
        }
    }
/**
 * Returns the ID generated from the previous INSERT operation.
 *
 * @param unknown_type $source
 * @return in
 */
    function lastInsertId($source = null) {
        return false;
    }
/**
 * Returns the ID generated from the previous INSERT operation.
 *
 * @param unknown_type $source
 * @return in
 */
    function lastNumRows($source = null) {
        return false;
    }
/**
 * Returns the ID generated from the previous INSERT operation.
 *
 * @param unknown_type $source
 * @return in
 */
    function lastAffected($source = null) {
        return false;
    }
/**
 * Returns true if the DataSource supports the given interface (method)
 *
 * @param string $interface The name of the interface (method)
 * @return boolean True on success
 */
    function isInterfaceSupported($interface) {
        $methods = get_class_methods(get_class($this));
        $methods = strtolower(implode('|', $methods));
        $methods = explode('|', $methods);
        $return = in_array(strtolower($interface), $methods);
        return $return;
    }
/**
 * Sets the configuration for the DataSource
 *
 * @param array $config The configuration array
 */
    function setConfig($config) {
        if (is_array($this->_baseConfig)) {
            $this->config = $this->_baseConfig;
            foreach ($config as $key => $val) {
                $this->config[$key] = $val;
            }
        }
    }
/**
 * Cache the DataSource description
 *
 * @param string $object The name of the object (model) to cache
 * @param mixed $data The description of the model, usually a string or array
 */
    function __cacheDescription($object, $data = null) {
        if ($this->cacheSources === false) {
            return null;
        }
        if (Configure::read() > 0) {
            $expires = "+15 seconds";
        } else {
            $expires = "+999 days";
        }

        if ($data !== null) {
            $this->__descriptions[$object] =& $data;
        }

        $key = ConnectionManager::getSourceName($this) . '_' . $object;
        $cache = Cache::read($key, '_cake_model_');

        if (empty($cache)) {
            $cache = $data;
            Cache::write($key, $cache, array('duration' => $expires, 'config' => '_cake_model_'));
        }

        return $cache;
    }
/**
 * Enter description here...
 *
 * @param unknown_type $query
 * @param unknown_type $data
 * @param unknown_type $association
 * @param unknown_type $assocData
 * @param Model $model
 * @param Model $linkModel
 * @param array $stack
 * @return unknown
 */
    function insertQueryData($query, $data, $association, $assocData, &$model, &$linkModel, $stack) {
        $keys = array('{$__cakeID__$}', '{$__cakeForeignKey__$}');

        foreach ($keys as $key) {
            $val = null;

            if (strpos($query, $key) !== false) {
                switch($key) {
                    case '{$__cakeID__$}':
                        if (isset($data[$model->alias]) || isset($data[$association])) {
                            if (isset($data[$model->alias][$model->primaryKey])) {
                                $val = $data[$model->alias][$model->primaryKey];
                            } elseif (isset($data[$association][$model->primaryKey])) {
                                $val = $data[$association][$model->primaryKey];
                            }
                        } else {
                            $found = false;
                            foreach (array_reverse($stack) as $assoc) {
                                if (isset($data[$assoc]) && isset($data[$assoc][$model->primaryKey])) {
                                    $val = $data[$assoc][$model->primaryKey];
                                    $found = true;
                                    break;
                                }
                            }
                            if (!$found) {
                                $val = '';
                            }
                        }
                    break;
                    case '{$__cakeForeignKey__$}':
                        foreach ($model->__associations as $id => $name) {
                            foreach ($model->$name as $assocName => $assoc) {
                                if ($assocName === $association) {
                                    if (isset($assoc['foreignKey'])) {
                                        $foreignKey = $assoc['foreignKey'];

                                        if (isset($data[$model->alias][$foreignKey])) {
                                            $val = $data[$model->alias][$foreignKey];
                                        } elseif (isset($data[$association][$foreignKey])) {
                                            $val = $data[$association][$foreignKey];
                                        } else {
                                            $found = false;
                                            foreach (array_reverse($stack) as $assoc) {
                                                if (isset($data[$assoc]) && isset($data[$assoc][$foreignKey])) {
                                                    $val = $data[$assoc][$foreignKey];
                                                    $found = true;
                                                    break;
                                                }
                                            }
                                            if (!$found) {
                                                $val = '';
                                            }
                                        }
                                    }
                                    break 3;
                                }
                            }
                        }
                    break;
                }
                if (empty($val) && $val !== '0') {
                    return false;
                }
                $query = str_replace($key, $this->value($val, $model->getColumnType($model->primaryKey)), $query);
            }
        }
        return $query;
    }
/**
 * To-be-overridden in subclasses.
 *
 * @param unknown_type $model
 * @param unknown_type $key
 * @return unknown
 */
    function resolveKey($model, $key) {
        return $model->alias . $key;
    }
/**
 * Closes the current datasource.
 *
 */
    function __destruct() {
        if ($this->_transactionStarted) {
            $null = null;
            $this->rollback($null);
        }
        if ($this->connected) {
            $this->close();
        }
    }
}
?>

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