@Mapper
public interface UserMapper {
@Select("select * from User")
public List<User> retrieveAllUsers();
//注意这里只有一个参数,则#{}中的标识符可以任意取
@Select("select * from User where id=#{param}")
public User retrieveUserById(int id);
// 模糊查询,使用 CONCAT('%',#{param},'%')
@Select("select * from User where id=#{id} and userName like CONCAT('%',#{name},'%')")
public User retrieveUserByIdAndName(@Param("id")int id, @Param("name")String names);
@Insert("INSERT INTO user(userName,userAge,userAddress) VALUES(#{userName},"
+ "#{userAge},#{userAddress})")
public void addNewUser(User user);
@Delete("delete from user where id=#{id}")
public void deleteUser(int id);
@Update("update user set userName=#{userName}, userAddress=#{userAddress}"
+ " where id=#{id}")
public void updateUser(User user);
}
当有多个参数时,需要加上@Param指定name,达到区别的目的。