三月 08, 2017 2:30:16 下午 org.apache.catalina.core.StandardWrapperValve invoke 严重: Servlet.service() fo

    xiaoxiao2021-03-25  147

    三月 08, 2017 2:30:16 下午 org.apache.catalina.core.StandardWrapperValve invoke 严重: Servlet.service() for servlet [SpringMVC] in context with path [/flip] threw exception [Request processing failed; nested exception is org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.TooManyResultsException: Expected one result (or null) to be returned by selectOne(), but found: 4] with root cause

    org.apache.ibatis.exceptions.TooManyResultsEx

    ception: Expected one result (or null) to be returned by selectOne(), but found: 4

    原来是我写的查询数据库得到一个对象的方法,结果数据库里面有多个符合我查询条件的对象,所以报错了。

    解决方法一:把数据库多条相同数据删除,

    解决方法二:把方法改成集合方法

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