laravel 执行原生sql语句

参考：Link

$db = DB::reconnect('MySQL1');
$sql = 'insert into a values (1);insert into b values(2);';
$db->getPdo()->exec($sql);

$results = DB::select('select * from users where id = :id', ['id' => 1]);

DB::insert('insert into users (id, name) values (?, ?)', [1, 'Dayle']);

$deleted = DB::delete('delete from users');

DB::statement('drop table users');

DB::transaction(function () {
    DB::table('users')->update(['votes' => 1]);

    DB::table('posts')->delete();
});

经测试：

DB::connection()->getPdo()->exec("DELETE FROM command where id = ?", [$id]);//使用占位符  错

DB::connection()->getPdo()->exec("DELETE FROM command where id = $id");//对

DB::delete("DELETE FROM command where id = ?", [$id]);  //使用占位符  对  推荐

DB::delete("DELETE FROM command where id = $id");       //对

DB::delete("DELETE FROM command where id = :id", ["id"=>$id]);  //使用命名绑定  对  推荐