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144b556d1f
Just like physical table name, the schema name is an important information that should be available in models. The property will be populated accordingly by the model's datasource.
431 lines
10 KiB
PHP
431 lines
10 KiB
PHP
<?php
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/**
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* DataSource base class
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*
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* PHP 5
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*
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* CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
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* Copyright 2005-2011, Cake Software Foundation, Inc. (http://cakefoundation.org)
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*
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* Licensed under The MIT License
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* Redistributions of files must retain the above copyright notice.
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*
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* @copyright Copyright 2005-2011, Cake Software Foundation, Inc. (http://cakefoundation.org)
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* @link http://cakephp.org CakePHP(tm) Project
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* @package Cake.Model.Datasource
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* @since CakePHP(tm) v 0.10.5.1790
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* @license MIT License (http://www.opensource.org/licenses/mit-license.php)
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*/
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/**
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* DataSource base class
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*
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* @package Cake.Model.Datasource
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*/
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class DataSource extends Object {
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/**
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* Are we connected to the DataSource?
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*
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* @var boolean
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*/
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public $connected = false;
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/**
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* The default configuration of a specific DataSource
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*
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* @var array
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*/
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protected $_baseConfig = array();
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/**
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* Holds references to descriptions loaded by the DataSource
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*
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* @var array
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*/
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protected $_descriptions = array();
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/**
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* Holds a list of sources (tables) contained in the DataSource
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*
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* @var array
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*/
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protected $_sources = null;
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/**
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* The DataSource configuration
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*
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* @var array
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*/
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public $config = array();
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/**
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* Whether or not this DataSource is in the middle of a transaction
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*
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* @var boolean
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*/
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protected $_transactionStarted = false;
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/**
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* Whether or not source data like available tables and schema descriptions
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* should be cached
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*
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* @var boolean
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*/
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public $cacheSources = true;
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/**
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* Constructor.
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*
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* @param array $config Array of configuration information for the datasource.
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*/
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public function __construct($config = array()) {
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parent::__construct();
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$this->setConfig($config);
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}
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/**
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* Caches/returns cached results for child instances
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*
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* @param mixed $data
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* @return array Array of sources available in this datasource.
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*/
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public function listSources($data = null) {
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if ($this->cacheSources === false) {
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return null;
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}
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if ($this->_sources !== null) {
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return $this->_sources;
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}
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$key = ConnectionManager::getSourceName($this) . '_' . $this->config['database'] . '_list';
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$key = preg_replace('/[^A-Za-z0-9_\-.+]/', '_', $key);
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$sources = Cache::read($key, '_cake_model_');
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if (empty($sources)) {
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$sources = $data;
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Cache::write($key, $data, '_cake_model_');
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}
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return $this->_sources = $sources;
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}
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/**
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* Returns a Model description (metadata) or null if none found.
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*
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* @param Model|string $model
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* @return array Array of Metadata for the $model
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*/
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public function describe($model) {
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if ($this->cacheSources === false) {
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return null;
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}
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if (is_string($model)) {
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$table = $model;
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} else {
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$table = $model->tablePrefix . $model->table;
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}
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if (isset($this->_descriptions[$table])) {
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return $this->_descriptions[$table];
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}
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$cache = $this->_cacheDescription($table);
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if ($cache !== null) {
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$this->_descriptions[$table] =& $cache;
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return $cache;
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}
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return null;
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}
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/**
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* Begin a transaction
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*
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* @return boolean Returns true if a transaction is not in progress
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*/
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public function begin() {
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return !$this->_transactionStarted;
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}
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/**
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* Commit a transaction
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*
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* @return boolean Returns true if a transaction is in progress
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*/
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public function commit() {
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return $this->_transactionStarted;
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}
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/**
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* Rollback a transaction
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*
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* @return boolean Returns true if a transaction is in progress
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*/
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public function rollback() {
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return $this->_transactionStarted;
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}
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/**
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* Converts column types to basic types
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*
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* @param string $real Real column type (i.e. "varchar(255)")
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* @return string Abstract column type (i.e. "string")
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*/
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public function column($real) {
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return false;
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}
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/**
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* Used to create new records. The "C" CRUD.
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*
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* To-be-overridden in subclasses.
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*
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* @param Model $model The Model to be created.
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* @param array $fields An Array of fields to be saved.
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* @param array $values An Array of values to save.
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* @return boolean success
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*/
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public function create(Model $model, $fields = null, $values = null) {
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return false;
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}
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/**
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* Used to read records from the Datasource. The "R" in CRUD
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*
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* To-be-overridden in subclasses.
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*
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* @param Model $model The model being read.
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* @param array $queryData An array of query data used to find the data you want
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* @return mixed
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*/
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public function read(Model $model, $queryData = array()) {
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return false;
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}
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/**
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* Update a record(s) in the datasource.
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*
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* To-be-overridden in subclasses.
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*
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* @param Model $model Instance of the model class being updated
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* @param array $fields Array of fields to be updated
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* @param array $values Array of values to be update $fields to.
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* @return boolean Success
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*/
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public function update(Model $model, $fields = null, $values = null) {
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return false;
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}
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/**
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* Delete a record(s) in the datasource.
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*
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* To-be-overridden in subclasses.
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*
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* @param Model $model The model class having record(s) deleted
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* @param mixed $conditions The conditions to use for deleting.
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* @return void
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*/
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public function delete(Model $model, $id = null) {
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return false;
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}
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/**
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* Returns the ID generated from the previous INSERT operation.
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*
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* @param mixed $source
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* @return mixed Last ID key generated in previous INSERT
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*/
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public function lastInsertId($source = null) {
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return false;
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}
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/**
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* Returns the number of rows returned by last operation.
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*
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* @param mixed $source
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* @return integer Number of rows returned by last operation
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*/
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public function lastNumRows($source = null) {
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return false;
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}
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/**
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* Returns the number of rows affected by last query.
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*
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* @param mixed $source
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* @return integer Number of rows affected by last query.
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*/
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public function lastAffected($source = null) {
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return false;
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}
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/**
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* Check whether the conditions for the Datasource being available
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* are satisfied. Often used from connect() to check for support
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* before establishing a connection.
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*
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* @return boolean Whether or not the Datasources conditions for use are met.
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*/
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public function enabled() {
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return true;
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}
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/**
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* Sets the configuration for the DataSource.
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* Merges the $config information with the _baseConfig and the existing $config property.
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*
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* @param array $config The configuration array
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* @return void
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*/
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public function setConfig($config = array()) {
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$this->config = array_merge($this->_baseConfig, $this->config, $config);
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}
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/**
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* Cache the DataSource description
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*
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* @param string $object The name of the object (model) to cache
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* @param mixed $data The description of the model, usually a string or array
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* @return mixed
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*/
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protected function _cacheDescription($object, $data = null) {
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if ($this->cacheSources === false) {
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return null;
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}
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if ($data !== null) {
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$this->_descriptions[$object] =& $data;
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}
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$key = ConnectionManager::getSourceName($this) . '_' . $object;
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$cache = Cache::read($key, '_cake_model_');
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if (empty($cache)) {
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$cache = $data;
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Cache::write($key, $cache, '_cake_model_');
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}
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return $cache;
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}
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/**
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* Replaces `{$__cakeID__$}` and `{$__cakeForeignKey__$}` placeholders in query data.
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*
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* @param string $query Query string needing replacements done.
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* @param array $data Array of data with values that will be inserted in placeholders.
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* @param string $association Name of association model being replaced
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* @param array $assocData
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* @param Model $model Instance of the model to replace $__cakeID__$
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* @param Model $linkModel Instance of model to replace $__cakeForeignKey__$
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* @param array $stack
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* @return string String of query data with placeholders replaced.
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* @todo Remove and refactor $assocData, ensure uses of the method have the param removed too.
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*/
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public function insertQueryData($query, $data, $association, $assocData, Model $model, Model $linkModel, $stack) {
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$keys = array('{$__cakeID__$}', '{$__cakeForeignKey__$}');
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foreach ($keys as $key) {
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$val = null;
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$type = null;
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if (strpos($query, $key) !== false) {
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switch ($key) {
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case '{$__cakeID__$}':
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if (isset($data[$model->alias]) || isset($data[$association])) {
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if (isset($data[$model->alias][$model->primaryKey])) {
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$val = $data[$model->alias][$model->primaryKey];
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} elseif (isset($data[$association][$model->primaryKey])) {
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$val = $data[$association][$model->primaryKey];
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}
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} else {
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$found = false;
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foreach (array_reverse($stack) as $assoc) {
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if (isset($data[$assoc]) && isset($data[$assoc][$model->primaryKey])) {
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$val = $data[$assoc][$model->primaryKey];
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$found = true;
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break;
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}
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}
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if (!$found) {
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$val = '';
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}
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}
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$type = $model->getColumnType($model->primaryKey);
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break;
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case '{$__cakeForeignKey__$}':
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foreach ($model->associations() as $id => $name) {
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foreach ($model->$name as $assocName => $assoc) {
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if ($assocName === $association) {
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if (isset($assoc['foreignKey'])) {
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$foreignKey = $assoc['foreignKey'];
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$assocModel = $model->$assocName;
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$type = $assocModel->getColumnType($assocModel->primaryKey);
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if (isset($data[$model->alias][$foreignKey])) {
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$val = $data[$model->alias][$foreignKey];
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} elseif (isset($data[$association][$foreignKey])) {
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$val = $data[$association][$foreignKey];
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} else {
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$found = false;
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foreach (array_reverse($stack) as $assoc) {
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if (isset($data[$assoc]) && isset($data[$assoc][$foreignKey])) {
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$val = $data[$assoc][$foreignKey];
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$found = true;
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break;
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}
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}
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if (!$found) {
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$val = '';
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}
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}
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}
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break 3;
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}
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}
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}
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break;
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}
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if (empty($val) && $val !== '0') {
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return false;
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}
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$query = str_replace($key, $this->value($val, $type), $query);
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}
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}
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return $query;
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}
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/**
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* To-be-overridden in subclasses.
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*
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* @param Model $model Model instance
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* @param string $key Key name to make
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* @return string Key name for model.
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*/
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public function resolveKey(Model $model, $key) {
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return $model->alias . $key;
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}
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/**
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* Returns the schema name. Override this in subclasses.
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*
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* @return string schema name
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* @access public
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*/
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public function getSchemaName() {
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return false;
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}
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/**
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* Closes the current datasource.
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*
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*/
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public function __destruct() {
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if ($this->_transactionStarted) {
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$this->rollback();
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}
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if ($this->connected) {
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$this->close();
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}
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}
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}
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