laravel框架model類查詢實現：
User::where(['uid'=8])->get();
User類繼承自Model類：Illuminate\Database\Eloquent\Model
當User類靜態調用where方法時，自動調用了Model里的魔術方法：
public static function __callStatic($method, $parameters)
{
$instance = new static; //這里的$instance就是User類的實例對象
return call_user_func_array([$instance, $method], $parameters);
}
相當于調用了user對象的where方法，這時就又調用了魔術方法：
public function __call($method, $parameters)
{
if (in_array($method, ['increment', 'decrement'])) {
return call_user_func_array([$this, $method], $parameters);
}
$query = $this->newQuery(); //返回Illuminate\Database\Eloquent\Builder對象
return call_user_func_array([$query, $method], $parameters);
}
相當于調用Illuminate\Database\Eloquent\Builder對象里的where方法和get方法，這兩個方法里其實
其實是封裝調用了Illuminate\Database\Query\Builder對象里的where方法和get方法->get方法里調用了runselect方法
runSelect方法:
/**
* 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); //調用connection 對象的select方法
}
再看connection對象是怎么傳到Illuminate\Database\Eloquent\Builder類實例里的：
Model類的newQuery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);
}
Model類的newQueryWithoutScopes方法：
/**
* 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() //這個方法返回
);
// 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);
}
Model類的newBaseQueryBuilder方法實現
/**
* Get a new query builder instance for the connection.
*
* @return \Illuminate\Database\Query\Builder
*/
protected function newBaseQueryBuilder()
{
$conn = $this->getConnection(); \\連接數據庫并返回connection對象
$grammar = $conn->getQueryGrammar();
return new QueryBuilder($conn, $grammar, $conn->getPostProcessor()); //Illuminate\Database\Query\Builder
}
Model類的$resolver屬性(連接解析器)的設定是通過
Illuminate\Database\DatabaseServiceProvider 里的boot方法設置的
這樣Model類的getConnection方法實際調用的DatabaseManager類的connection方法，返回connection類實例
如何創建的數據庫連接：
Model類getConnection方法->DatabaseManager類connection方法->
->ConnectionFactory類的createSingleConnection()
/**
* Create a single database connection instance.
*
* @param array $config
* @return \Illuminate\Database\Connection
*/
protected function createSingleConnection(array $config)
{
//創建連接器對象并連接數據庫返回pdo對象
$pdo = $this->createConnector($config)->connect($config);
//傳入PDO對象、并返回connection對象，connection對象負責查詢數據庫
return $this->createConnection($config['driver'], $pdo, $config['database'], $config['prefix'], $config);
}
以上這篇laravel5.1框架model類查詢的實現方法就是小編分享給大家的全部內容了，希望能給大家一個參考，也希望大家多多支持腳本之家。
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