【已解决】MyBatis查询数据报错 Request processing failed; nested exception is org.mybatis.spring.MyBatisSyst

爱被打了一巴掌 2022-06-01 01:48 258阅读 0赞

### 报错内容 ###

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException: 
    ### Error querying database. Cause: java.lang.UnsupportedOperationException
    ### The error may exist in file [E:\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\day13_Pritice\WEB-INF\classes\com\wu\employee\mapper\IDepartmentMapper.xml]
    ### The error may involve com.wu.employee.mapper.IDepartmentMapper.getAllDepartment
    ### The error occurred while handling results
    ### SQL: SELECT * FROM department
    ### Cause: java.lang.UnsupportedOperationException
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:943)
    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:822)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:807)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

### 错误截图 ###

![这里写图片描述][SouthEast]

### 原因分析 ###

1.  SQL 语句写错了。此处SQl没问题。
2.  mapper配置文件中的结果集写错了，假如返回的结果集是多个JavaBean，那么resultType=”javaBean”, 例如：查询Department的List列表，resultType应该写成Department的全类名而不是java.util.List

#### 错误示范： ####

<?xml version="1.0" encoding="UTF-8" ?>
    <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
    <mapper namespace="com.wu.employee.mapper.IDepartmentMapper">
      
      <select id="getAllDepartment" resultType="java.util.List">
        SELECT * FROM  department 
      </select>
    
     </mapper>

#### 正确代码： ####

<?xml version="1.0" encoding="UTF-8" ?>
    <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
    <mapper namespace="com.wu.employee.mapper.IDepartmentMapper">
      
      <select id="getAllDepartment" resultType="com.wu.employee.beans.Department">
        SELECT * FROM  department 
      </select>
    
     </mapper>

[SouthEast]: /images/20220601/7dc89916624a4e57b4ecd68e97f54611.png

【已解决】MyBatis查询数据报错 Request processing failed; nested exception is org.mybatis.spring.MyBatisSyst

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