如何在Spring中只实现CrudRepository的具体方法？ [英] How to implement only specific method of CrudRepository in Spring?

问题描述

我正在使用spring-data-jpa的 CrudRepository 来定义一个实体的接口，然后拥有所有标准的crud方法，而不必明确提供一个实现，例如：

I'm using CrudRepository of spring-data-jpa to just define an interface of an entity and then having all standard crud methods without having to provide an implementation explicitly, eg:

public interface UserRepo extends CrudRepository<User, Long> {

}

虽然现在我只想覆盖<我的自定义实现中的code> save（）方法。我怎么能实现这个目标？因为，如果我实现接口 UserRepo ，我必须实现从接口继承的所有其他CRUD方法CrudRepository 。

Though now I'd like to override only the save() method in my custom implementation. How could I achieve this? Because, if I implement the interface UserRepo, I'd have to implement all other CRUD methods that are inherited from interface CrudRepository.

我不能编写自己的具有所有CRUD方法的实现，但是只重写一个而不必自己实现所有其他方法吗？

Can't I write my own implementation that has all CRUD methods but overriding only one without having to implement all others myself?

推荐答案

你可以做一些非常相似的，我相信这会达到你想要的结果。

You can do something pretty similar, which I believe will achieve the result you're looking for.

步骤必要：

1） UserRepo 现在将扩展2个接口：

1) UserRepo will now extend 2 interfaces:

public interface UserRepo extends CrudRepository<User, Long>, UserCustomMethods{

}

2）创建一个名为 UserCustomMethods （您可以在此处和步骤1中选择名称并进行更改）

2) Create a new interface named UserCustomMethods (you can choose the name and change both here and in step 1)

public interface UserCustomMethods{
    public void mySave(User... users);

}

3）创建一个名为 UserRepoImpl （此处名称确实很重要，它应该是RepositoryName Impl ，因为如果您将其称为其他内容，则需要调整相应的Java / XML配置）。这个类应该只实现你创建的 CUSTOM 接口。

3) create a new class named UserRepoImpl (here the name does matter and it should be RepositoryNameImpl, because if you call it something else, you will need to adjust the Java/XML configuration accordingly). this class should implement only the CUSTOM interface you've created.

提示：你可以在这个类中为你的查询注入entitymanager

public class UserRepoImpl implements UserCustomMethods{

    //This is my tip, but not a must...
    @PersistenceContext
    private EntityManager em;

    public void mySave(User... users){
        //do what you need here
    }
}

4）在任何需要的地方注入 UserRepo ，享受CRUD和自定义方法:)

4) Inject UserRepo wherever you need, and enjoy both CRUD and your custom methods :)

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