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Cause: org.apache.ibatis.executor.ExecutorException: A query was run and no Result Maps were found for the Mapped Statement 'com.shadow.foretaste.UserInfoDao.getPhoneNum'. It's likely that neither a Result Type nor a Result Map was specified.
导致这个错误的原因是:
mapper.xml中没有指定返回值类型
<select id="getPhoneNum" >
select phone_num from user_info where id = #{id}
</select>修改后:
<select id="getPhoneNum" resultType="String">
select phone_num from user_info where id = #{id}
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