mysql - 如何在 Laravel 中运行左外连接 SQL 查询

Question

我无法使用查询构建器在 Laravel 中编写此查询:

```
SELECT pt.name, IF(up.permission_id IS NULL,'false','true') permission
    FROM mercuri_permission_type pt 
    LEFT OUTER JOIN mercuri_user_permission up 
    ON pt.id = up.permission_id AND up.user_id = $user_id
```

Answer 1

你应该做 multi left join 来处理这个问题；但我建议您使用 doctrine ORM 并在 doctrine 上运行此查询。为了在 Laravel 中使用 Doctrine，以下链接将很有用:

Getting started doctrine 2 laravel

Working entities doctrine 2

Creating testing doctrine repositories

Using doctrine query language