使用注解方式开发持久层接口

public interface IUserDao { /** * 查询所有用户 * @return */ @Select("select * from user") @Results(id="userMap", value= { @Result(id=true,column="id",property="userId"), @Result(column="username",property="userName"), @Result(column="sex",property="userSex"), @Result(column="address",property="userAddress"), @Result(column="birthday",property="userBirthday") }) List findAll(); * 根据 id 查询一个用户 * @param userId * @return */ @Select("select * from user where id = #{uid} ") @ResultMap("userMap") User findById(Integer userId); /** * 保存操作 * @param user * @return */ @Insert("insert into user(username,sex,birthday,address)values(#{username},#{sex},#{birthday},#{address} )") @SelectKey(keyColumn="id",keyProperty="id",resultType=Integer.class,before = false, statement = { "select last_insert_id()" }) int saveUser(User user); /** * 更新操作 * @param user * @return */ @Update("update user set username=#{username},address=#{address},sex=#{sex},birthday=#{birthday} where id =#{id} ") int updateUser(User user); /** * 删除用户 * @param userId * @return */ @Delete("delete from user where id = #{uid} ") int deleteUser(Integer userId); /** * 查询使用聚合函数 * @return */ @Select("select count(*) from user ") int findTotal();