Mybatis本人配置出错解决

最新推荐文章于 2022-06-17 17:24:46 发布

YinXinLion

最新推荐文章于 2022-06-17 17:24:46 发布

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本文解析了两个常见的MyBatis映射文件配置错误：一是select元素ID与接口方法名称不匹配导致的无效边界声明；二是resultMap与resultType混淆使用引发的持久化异常。

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1、

Invalid bound statement (not found): com.lion.mapper.OrdersMapperCustom.findUserItems

原因：select中的id和对应接口中的名称不匹配导致的。
解决：id名与方法名一致

错误：
<select id="findUserItem" resultMap="ItemResultMap">
public List<User> findUserItems()throws Exception;
正确：
<select id="findUserItems" resultMap="ItemResultMap">
public List<User> findUserItems()throws Exception;

2、

Exception in thread "main" org.apache.ibatis.exceptions.PersistenceException: 
### Error building SqlSession.
### The error may exist in com/lion/mapper/OrdersMapperCustom.xml
### The error occurred while processing mapper_resultMap[OrdersAndOrderDetailResultMap]_collection[orderdetails]
org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java:66)
    at com.lion.Test.main.main(main.java:24)
Caused by: org.apache.ibatis.builder.BuilderException: Error parsing SQL Mapper Configuration. Cause: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error resolving class. Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias 'OrdersAndOrderDetailResultMap'.  Cause: java.lang.ClassNotFoundException: Cannot find class: OrdersAndOrderDetailResultMap
    at org.apache.ibatis.builder.xml.XMLConfigBuilder.parseConfiguration(XMLConfigBuilder.java:109)
    at org.apache.ibatis.builder.xml.XMLConfigBuilder.parse(XMLConfigBuilder.java:92)
    at org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java:80)
    ... 2 more
Caused by: org.apache.ibatis.builder.BuilderException: Error resolving class. Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias 'OrdersAndOrderDetailResultMap'.  Cause: java.lang.ClassNotFoundException: Cannot find class: OrdersAndOrderDetailResultMap
这个错误原因是 resultMap 写成了 resultType的问题  一定要注意 ，，，自习观察

原因：这个错误原因是 resultMap 写成了 resultType的问题
解决：将出错的select标签中的resultType改成resultMap即可

错误：
<select id="findOrdersAndOrderDetailResultMap" resultType="OrdersAndOrderDetailResultMap">
正确：
<resultMap type="com.lion.po.Orders" id="OrdersAndOrderDetailResultMap">
...
</resultMap>

<select id="findOrdersAndOrderDetailResultMap" resultMap="OrdersAndOrderDetailResultMap">