如何在Laravel eloquent中运行insert之前锁定表

use Illuminate\Support\Facades\DB;

DB::beginTransaction();

DB::select('SELECT * FROM users FOR UPDATE');

DB::table('users')->insert([
    'name' => 'John Doe',
    'email' => 'johndoe@example.com',
]);

DB::commit();

try {
    // 开始事务
    DB::beginTransaction();

    // 锁定表
    DB::select('SELECT * FROM users FOR UPDATE');

    // 运行insert
    DB::table('users')->insert([
        'name' => 'John Doe',
        'email' => 'johndoe@example.com',
    ]);

    // 提交事务
    DB::commit();
} catch (\Exception $e) {
    // 发生异常，回滚事务
    DB::rollback();
    // 处理异常
    // ...
}