關於在SpringBoot中自定義Sql語句

@Mapper
public interface MessageMapper {
    int countByExample(MessageExample example);

    int deleteByExample(MessageExample example);

    int deleteByPrimaryKey(String id);

    int insert(Message record);

    int insertSelective(Message record);

    List<Message> selectByExample(MessageExample example);

    Message selectByPrimaryKey(String id);

    int
 
 updateByExampleSelective(@Param("record") Message record, @Param("example") MessageExample example);

    int updateByExample(@Param("record") Message record, @Param("example") MessageExample example);

    int updateByPrimaryKeySelective(Message record);

    int updateByPrimaryKey(Message record);

    @Select
 
("select *,count(*) as count from message WHERE toid = #{userId} GROUP BY formid ORDER BY created_date desc limit #{offset}, #{limit}")
    List<Message> selectConversationList(@Param("userId") String userId, @Param("offset") int offset, @Param("limit") int limit);

    @Update("update message set has_read = 1 where conversation_id = #{conversationId}"
 
)
    void updateMessageHasReadByConversationId(@Param("conversationId") String conversationId);
}
}

上面程式碼中selectConversationList()就是自定義的Sql,只需要在方法的上面加上註解@Select即可，當然還有其他的例如Delete,Update。引數怎樣定義在上面也有寫到