org.apache.ibatis.executor.ExecutorException: A query was run and no Result Maps were found for the Mapped Statement ‘com.trf.mapper.UserMapper.queryUserList’.
It’s likely that neither a Result Type nor a Result Map was specified.
译文:
查询运行,没有为映射语句“com.trf.mapper.UserMapper.queryUserList”找到结果映射。
很可能既没有指定结果类型也没有指定结果映射。
问题原因:
UserMapper.xml文件里 查询标签用错,查询(select) 时使用 resultType,
增(insert)、删(delete)、改(update)时,使用parameterType标签
解决办法:
<!--注意!注意!注意!查询select里面使用 resultType="User",其余 增、删、改 全部用parameterType="User" -->
<!--增:添加用户-->
<insert id="addUser" parameterType="User">
insert into mybatis.user(id, name, pwd) values (#{id},#{name},#{pwd})
</insert>
<!--删:删除用户-->
<delete id="deleteUser" parameterType="int">
delete from mybatis.user where id= #{id}
</delete>
<!--改:修改用户信息-->
<update id="updateUser" parameterType="User">
update mybatis.user set name =#{name},pwd = #{pwd} where id=#{id};
</update>
<!--查:查询全部用户-->
<select id="queryUserList" resultType="User" >
select * from mybatis.user;
</select>
<!--查:按照id查询-->
<select id="queryUserById" resultType="User">
select * from mybatis.user where id=#{id};
</select>