laravel5.1框架model类查询的实现方法_php实例_

 public static function __callStatic($method, $parameters) { $instance = new static; //这里的$instance就是User类的实例对象 return call_user_func_array([$instance, $method], $parameters); } 

 public function __call($method, $parameters) { if (in_array($method, ['increment', 'decrement'])) { return call_user_func_array([$this, $method], $parameters); } $query = $this->newQuery(); //返回Illuminate\Database\Eloquent\Builder对象 return call_user_func_array([$query, $method], $parameters); } 

 /** * Run the query as a "select" statement against the connection. * * @return array */ protected function runSelect() { return $this->connection->select($this->toSql(), $this->getBindings(), ! $this->useWritePdo); //调用connection 对象的select方法 }

 /** * Get a new query builder for the model's table. * * @return \Illuminate\Database\Eloquent\Builder */ public function newQuery() { $builder = $this->newQueryWithoutScopes(); return $this->applyGlobalScopes($builder); } 

 /** * Get a new query builder that doesn't have any global scopes. * * @return \Illuminate\Database\Eloquent\Builder|static */ public function newQueryWithoutScopes() { $builder = $this->newEloquentBuilder( $this->newBaseQueryBuilder() //这个方法返回 ); // Once we have the query builders, we will set the model instances so the // builder can easily access any information it may need from the model // while it is constructing and executing various queries against it. return $builder->setModel($this)->with($this->with); } 

 /** * Get a new query builder instance for the connection. * * @return \Illuminate\Database\Query\Builder */ protected function newBaseQueryBuilder() { $conn = $this->getConnection(); \\连接数据库并返回connection对象 $grammar = $conn->getQueryGrammar(); return new QueryBuilder($conn, $grammar, $conn->getPostProcessor()); //Illuminate\Database\Query\Builder } 

 /** * Create a single database connection instance. * * @param array $config * @return \Illuminate\Database\Connection */ protected function createSingleConnection(array $config) { //创建连接器对象并连接数据库返回pdo对象 $pdo = $this->createConnector($config)->connect($config); //传入PDO对象、并返回connection对象，connection对象负责查询数据库 return $this->createConnection($config['driver'], $pdo, $config['database'], $config['prefix'], $config); }