时间:2021-05-26
laravel框架model类查询实现:
User::where(['uid'=8])->get();
User类继承自Model类:Illuminate\Database\Eloquent\Model
当User类静态调用where方法时,自动调用了Model里的魔术方法:
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], $parameters);}相当于调用了user对象的where方法,这时就又调用了魔术方法:
public function __call($method, $parameters){ if (in_array($method, ['increment', 'decrement'])) { return call_user_func_array([$this, $method], $parameters); } $query = $this->newQuery(); //返回Illuminate\Database\Eloquent\Builder对象 return call_user_func_array([$query, $method], $parameters);}相当于调用Illuminate\Database\Eloquent\Builder对象里的where方法和get方法,这两个方法里其实
其实是封装调用了Illuminate\Database\Query\Builder对象里的where方法和get方法->get方法里调用了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); //调用connection 对象的select方法}再看connection对象是怎么传到Illuminate\Database\Eloquent\Builder类实例里的:
Model类的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类的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() //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);}Model类的newBaseQueryBuilder方法实现
/** * 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, $conn->getPostProcessor()); //Illuminate\Database\Query\Builder}Model类的$resolver属性(连接解析器)的设定是通过
Illuminate\Database\DatabaseServiceProvider 里的boot方法设置的
这样Model类的getConnection方法实际调用的DatabaseManager类的connection方法,返回connection类实例
如何创建的数据库连接:
Model类getConnection方法->DatabaseManager类connection方法->
->ConnectionFactory类的createSingleConnection()
/** * 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); }以上这篇laravel5.1框架model类查询的实现方法就是小编分享给大家的全部内容了,希望能给大家一个参考,也希望大家多多支持。
声明:本页内容来源网络,仅供用户参考;我单位不保证亦不表示资料全面及准确无误,也不保证亦不表示这些资料为最新信息,如因任何原因,本网内容或者用户因倚赖本网内容造成任何损失或损害,我单位将不会负任何法律责任。如涉及版权问题,请提交至online#300.cn邮箱联系删除。
本文实例讲述了laravel5.1框架下的批量赋值实现方法。分享给大家供大家参考,具体如下:官方中文文档在这里:http://laravel-china.org
本文实例讲述了Laravel5.1框架模型一对一关系实现与使用方法。分享给大家供大家参考,具体如下:这篇文章主要记录模型的一对一关系,关联关系是Model的一种
本文实例讲述了Laravel5.1框架分页展示实现方法。分享给大家供大家参考,具体如下:Laravel为我们提供了一套分页的逻辑,我们无需自己实现分页逻辑,只需
本文实例讲述了Laravel5.1框架模型查询作用域定义与用法。分享给大家供大家参考,具体如下:所谓的查询作用域就是允许你自定义一个查询语句把它封装成一个方法。
本文实例讲述了Laravel5.1框架登录和注册实现方法。分享给大家供大家参考,具体如下:关于登录和注册Laravel自带了一套组件实现了这一功能,我们只需要实