Mayatis 异常之result maps collection already contains value...

这个异常，用过myBatis的肯定都是见过的，除了网上说的，一个mapper.xml文件中的id重复，还有很多错误会导致这个异常，最近工作中遇到很多新的原因导致该异常，收集如下供大家参考：

1，xml文件中的id重复，修改id即可

2，resulttype和resultmap属性使用混乱，该用resultType的时候不能用resulttype

3，命名空间错误，什么意思？就是最好尽量用完整的包名+类名，这点包括很多情况，有时候属性value中多一个空格都不行，‘xxx.aVo‘和‘ xxx.aVo‘是不一样的

4,注意检查xml文件与mapper.java接口的对应情况，保证一一对应且唯一

5，发现后持续更新收集

 

时间： 2024-11-05 00:10:00

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