我们如何使用Hibernate和JPA调用存储过程？

Question

我们如何使用Hibernate或JPA调用存储过程？

Answer 1

考虑以下只返回基本返回值的存储过程:

CREATE OR REPLACE PROCEDURE count_comments (  
   postId IN NUMBER,  
   commentCount OUT NUMBER )  
AS 
BEGIN 
    SELECT COUNT(*) INTO commentCount  
    FROM post_comment  
    WHERE post_id = postId; 
END;

您可以使用标准JPA调用此方法:

StoredProcedureQuery query = entityManager
    .createStoredProcedureQuery("count_comments")
    .registerStoredProcedureParameter(1, Long.class, 
        ParameterMode.IN)
    .registerStoredProcedureParameter(2, Long.class, 
        ParameterMode.OUT)
    .setParameter(1, 1L);

query.execute();

Long commentCount = (Long) query.getOutputParameterValue(2);

如果存储过程返回SYS_REFCURSOR:

CREATE OR REPLACE PROCEDURE post_comments ( 
   postId IN NUMBER, 
   postComments OUT SYS_REFCURSOR ) 
AS 
BEGIN
    OPEN postComments FOR
    SELECT *
    FROM post_comment 
    WHERE post_id = postId; 
END;

你可以这样称呼它:

StoredProcedureQuery query = entityManager
    .createStoredProcedureQuery("post_comments")
    .registerStoredProcedureParameter(1, Long.class, 
         ParameterMode.IN)
    .registerStoredProcedureParameter(2, Class.class, 
         ParameterMode.REF_CURSOR)
    .setParameter(1, 1L);

query.execute();

List<Object[]> postComments = query.getResultList();

如果要调用Oracle数据库函数:

CREATE OR REPLACE FUNCTION fn_count_comments ( 
    postId IN NUMBER ) 
    RETURN NUMBER 
IS
    commentCount NUMBER; 
BEGIN
    SELECT COUNT(*) INTO commentCount 
    FROM post_comment 
    WHERE post_id = postId; 
    RETURN( commentCount ); 
END;

你不能使用StoredProcedureQuery它,因为它不适用于Hibernate 5,所以你可以像这样调用它:

BigDecimal commentCount = (BigDecimal) entityManager
    .createNativeQuery(
        "SELECT fn_count_comments(:postId) FROM DUAL"
    )
    .setParameter("postId", 1L)
    .getSingleResult();

或使用纯JDBC:

Session session = entityManager.unwrap( Session.class ); 

Integer commentCount = session.doReturningWork( connection -> {
    try (CallableStatement function = connection.prepareCall(
            "{ ? = call fn_count_comments(?) }" )) {
        function.registerOutParameter( 1, Types.INTEGER );
        function.setInt( 2, 1 );
        function.execute();
        return function.getInt( 1 );
    }
} );

有关更多详细信息,请查看以下文章:

• 如何使用JPA和Hibernate调用Oracle存储过程和函数
• 如何使用JPA和Hibernate调用SQL Server存储过程和函数
• 如何使用JPA和Hibernate调用PostgreSQL函数(存储过程)
• 如何使用JPA和Hibernate调用MySQL存储过程和函数

Answer 2

您可以执行以下操作

 Session session = sessionFactory.openSession();
Transaction tx = session.beginTransaction();
PreparedStatement st = session.connection().prepareStatement("{call procedureName(?, ?)}");
                st.setString(1, formatter.format(parameter1));
                st.setString(2, formatter.format(parameter2));
                st.execute();
tx.commit();

请在需要的地方添加异常处理。