今天遇到一个问题，原来是mapper.xml文件出了问题,是使用MyBatis最常见的一种错误

报错的结果是这样的：

 A query was run and no Result Maps were found for the Mapped Statement 'cn.zrgk.dao.RoleMapper.getRoleList'.  

　　It's likely that neither a Result Type nor a Result Map was specified.
	
org.apache.ibatis.executor.ExecutorException: A query was run and no Result Maps were found for the Mapped Statement 'cn.zrgk.dao.RoleMapper.getRoleList'. 
　　 It's likely that neither a Result Type nor a Result Map was specified.

    org.apache.ibatis.executor.resultset.FastResultSetHandler.validateResultMapsCount(FastResultSetHandler.java:177)

    org.apache.ibatis.executor.resultset.FastResultSetHandler.handleResultSets(FastResultSetHandler.java:150)

    org.apache.ibatis.executor.statement.PreparedStatementHandler.query(PreparedStatementHandler.java:57)

    org.apache.ibatis.executor.statement.RoutingStatementHandler.query(RoutingStatementHandler.java:70)

    org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:57)

    org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:259)

    org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:132)

    org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:105)

    org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:81)

    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)

    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

    java.lang.reflect.Method.invoke(Method.java:606)

我的mapper.xml文件中有个查询语句是这样写的：

　　大家看看图一，好像根本没有错误，对吗？再看看

　　是的，没错，我没有指定这个方法的返回类型，系统无法识别，于是就这样改了一下，发现不报错了

所以平时啊，我们要多多注意这些细节，更要去多加理解

A query was run and no Result Maps were found for...原来是mapper.xml文件出了问题,是使用MyBatis最常见的一种错误的更多相关文章

  1. A query was run and no Result Maps were found for the Mapped Statement 'user.insertUser!selectKey'. It's likely that neither a Result Type nor a Result Map was specified.

    使用mybatis时出现异常问题: 有如下的错误 Error querying database. Cause: org.apache.ibatis.executor.ExecutorExceptio ...

  2. mybatis配置文件xxxx.xml中缺失返回类型的后果A query was run and no Result Maps were found

    使用mybatis时出现异常问题: 有如下的错误 Error querying database.  Cause: org.apache.ibatis.executor.ExecutorExcepti ...

  3. 出错：Cause: org.apache.ibatis.executor.ExecutorException: A query was run and no Result Maps were found for the Mapped Statement 'cn.mgy.mapper.UserMapper.findById'.

    详细出错代码: org.apache.ibatis.exceptions.PersistenceException: ### Error querying database. Cause: org.a ...

  4. A query was run and no Result Maps were found for the Mapped Statement

    mybatis测试方法报错: org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exec ...

  5. mybatis使用map传递多参数报错：A query was run and no Result Maps were found for the Mapped Statement

    在使用mybatis进行多参数传递时,报错: A query was run and no Result Maps were found for the Mapped Statement 'xx.xx ...

  6. ExecutorException: A query was run and no Result Maps were found for the Mapped Statement ‘com.win.mall.dao.CartMapper.test’. It’s likely that neither a Result Type nor a Result Map was specified.

    ExecutorException: A query was run and no Result Maps were found for the Mapped Statement 'com.win.m ...

  7. mybatis报错：A query was run and no Result Maps were found for the Mapped Statement、、Property [login_ip] not found on type [com.thinkgem.jeesite.common.permission.entity.PremissUser]问题解决

    今天在做ssm项目的时候出现了: 先是出现 了错误: mybatis报错:A query was run and no Result Maps were found for the Mapped St ...

  8. mybatis报错：A query was run and no Result Maps were found for the Mapped Statement

    转自:https://blog.csdn.net/u013399093/article/details/53087469 今天编辑mybatis的xml文件,出现如下错误: 程序出现异常[A quer ...

  9. mybatis mapper xml文件配置resultmap时，id行和result行有什么区别？

    mybatis mapper xml文件配置resultmap时,id行和result行有什么区别? <resultMap id = "CashInvoiceMap" typ ...

随机推荐

  1. Spring-Kafka —— KafkaListener手动启动和停止

    一.KafkaListener消费 /** * 手动提交监听. * * @param record 消息记录 * @param ack 确认实例 */ @Override @KafkaListener ...

  2. Linux 查看修改SWAP大小

    1  查看swap 空间大小(总计):     # free -m          默认单位为k, -m 单位为M                total       used       fre ...

  3. Spring Boot Mybatis简单使用

    Spring Boot Mybatis简单使用 步骤说明 build.gradle:依赖添加 application.properties:配置添加 代码编写 测试 build.gradle:依赖添加 ...

  4. Unity小白文——单例的定义

    当类继承与MonoBehaviour时 public class TestSingle : MonoBehaviour { public static TestSingle Instance; voi ...

  5. Zookeeper白话解释

    官方的解释:Zookeeper提供了诸如统一命名空间服务,配置服务和分布式锁等分布式基础服务. 嗯,说上面这个话的人,良心不会痛吗? Zookeeper功能如上边说到的:统一命名空间服务 其他就tm跟 ...

  6. day20 logging模块、re模块

    今日内容: 1.logging模块 2.re模块 1.logging模块 -- 什么是logging模块 -- logging模块是用来进行记录日志的模块,主要作用是将想要输出的日志进行分级,然后以不 ...

  7. 性能排查--CPU占用高

    排查思路: 1.先找到占用CPU高的进程PID    top命令 2.top -H -p <PID>  查看哪个占用CPU高的线程TID 3.jstack <PID>  /ho ...

  8. 彻底搞懂 Elasticsearch Java API

    说明 在明确了ES的基本概念和使用方法后,我们来学习如何使用ES的Java API. 本文假设你已经对ES的基本概念已经有了一个比较全面的认识. 客户端 你可以用Java客户端做很多事情: 执行标准的 ...

  9. 华为 huawei 查看系统中存在的安全风险信息 display security risk

    查看系统中存在的安全风险信息. 应用场景 由于协议自身的安全性能不同,用户配置时使用的某些协议可能存在安全风险.通过该命令可查看系统中存在的安全风险,并根据给出的修复建议解除风险.例如,用户配置了SN ...

  10. VMware虚拟机下安装CentOS 6.10并配置访问外网

    VMware安装包以及CentOS 6.5安装包 链接:https://pan.baidu.com/s/1wQi5GSgp4klXhtd84aoMSA 提取码:9l5y 链接:https://pan. ...