DB::table('users') ->where('name', '=', 'John') ->orWhere(function ($query) { $query->where('votes', '>', 100) ->where('title', '<>', 'Admin'); }) ->get();如你所见,上面例子会将闭包传入orWhere 方法,以告诉查询语句构造器开始一个约束分组。此
DB::table('users') ->whereExists(function ($query) { $query->select(DB::raw(1)) ->from('orders') ->whereRaw('orders.user_id = users.id'); }) ->get();上述查询将生成以下 SQL:select * from users where exists ( select 1 from orders where orders.user_id = users.id )...
Once you have configured your database connection, you may run queries using the DB facade. The DB facade provides methods for each type of query: select, update, insert, delete, and statement.Running A Select QueryTo run a basic SELECT query, you may use the select method on the DB ...
The database query builder provides a convenient, fluent interface to creating and running database queries. It can be used to perform most database operations in your application, and works on all supported database systems.The Laravel query builder uses PDO parameter binding to protect your ...
Laravel数据库服务的配置位于应用程序的config/database.php配置文件中。在此文件中,您可以定义所有数据库连接,并指定默认情况下应使用的连接。此文件中的大多数配置选项由应用程序环境变量的值驱动。本文件提供了Laravel支持的大多数数据库系统的示例。在默认情况下,Laravel 的示例 环境配置 使用了 Laravel Sail,Laravel...
$instance->newQuery(), $this, $instance->getTable().'.'.$foreignKey, $localKey ); } /** * 创建一个关联表模型的实例 */ protected function newRelatedInstance($class) { return tap(new $class, function ($instance) { if (! $instance->getConnectionName()) { ...
return new DatabaseManager($app, $app['db.factory']); }); $this->app->bind('db.connection', function ($app) { return $app['db']->connection(); }); } db.factory用来创建数据库连接实例,它将被注入到DatabaseManager中,在讲服务容器绑定时就说过了依赖注入的其中一个作用是延迟初始化对象,...
在所有模型都要继承的 laravel/framework/src/Illuminate/Database/Eloquent/Model.php 类中,我们很快就能发现一个 query() 静态方法。一路向下追踪,你马上就会发现它最后会调用到一个 newBaseQueryBuilder() 方法。 代码语言:javascript 代码运行次数:0
<?phpuse Illuminate\Support\Facades\Schema;use Illuminate\Database\Schema\Blueprint;use Illuminate\Database\Query\Expression;use Illuminate\Database\Migrations\Migration;return new class extends Migration{ /** * 运行迁移 * * @return void */ public function up() { Schema::create('flights', ...
namespaceIlluminate\Database;...classConnectionimplementsConnectionInterface{...publicfunctiontable($table,$as=null){return$this->query()->from($table,$as);}publicfunctionquery(){returnnewQueryBuilder($this,$this->getQueryGrammar(),$this->getPostProcessor());} Connection ...