Mapped Statements collection does not contain value for(mybatis框架项目)
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java.lang.IllegalArgumentException: Mapped Statements collection does not contain value for XXX类或者方法即有以下四种可能性:
1、mapper.xml中没有加入namespace
2、mapper.xml中的方法和接口mapper的方法不对应
3、mapper.xml没有加入到mybatis-config.xml中(即总的配置文件),例外:配置了mapper文件的包路径的除外
4、mapper.xml文件名和所写的mapper名称不相同。
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