如何通过使用Spring Data调用存储过程来选择实体 [英] How to select entities by calling a stored procedure with Spring Data

问题描述

假设我有一个包含以下选择的MySQL存储过程:

Let's say I have a MySQL stored procedure that contains the following select:

select * from users;

如何在JpaRepository中使用@Procedure批注，以便获得结果?像这样:

How to use the @Procedure annotation in a JpaRepository so that I can get the results? Something like:

public UserRepository extenda JpaRepository<User, Long>{
    @Procedure('get_users')
    List<User> getUsers();
}

推荐答案

让我们说这是您的过程:

Let's say this is your procedure:

CREATE OR REPLACE PROCEDURE get_users(data out SYS_REFCURSOR)
AS
BEGIN
OPEN data FOR SELECT * FROM USERS;
END;

您定义@NamedStoredProcedureQuery:

@NamedStoredProcedureQuery(
    name="getUsers", 
    procedureName="get_users", 
    resultClass=User.class, parameters={
        @StoredProcedureParameter(queryParameter="data", name="data", direction=Direction.OUT_CURSOR)
    }
)
@Entity
public class User {
    ...
}

然后您可以像这样调用过程:

And then you can call your procedure like this:

public UserRepository extends JpaRepository<User, Long>{
    @Procedure('User.getUsers')
    List<User> getUsers();
}

您还可以使用EntityManager对此进行检查，如下所示:

You can also check this using your EntityManager like this:

Query query = entitymanager.createNamedQuery("getUsers");
List users = query.getResultList();

这篇关于如何通过使用Spring Data调用存储过程来选择实体的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！