mybatis中：returned more than one row, where no more than one was expected.異常

本文轉載自查看原文 2015-01-27 20:40 14876 Exception

org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.executor.ExecutorException: Statement returned more than one row, where no more than one was expected.
    at org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:75) ~[MyBatisExceptionTranslator.class:1.2.2]
    at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:371) ~[SqlSessionTemplate$SqlSessionInterceptor.class:1.2.2]

Caused by: org.apache.ibatis.executor.ExecutorException: Statement returned more than one row, where no more than one was expected.
    at org.apache.ibatis.executor.ResultExtractor.extractObjectFromList(ResultExtractor.java:58) ~[ResultExtractor.class:3.2.8]
    at org.apache.ibatis.executor.loader.ResultLoader.loadResult(ResultLoader.java:71) ~[ResultLoader.class:3.2.8]

由於查找出了多個對象，一般查找的那個字段是數據有重復。

程序期望返回不超過一行數據，但實際返回了多於一行的數據。

比如sql語句的返回類型是非集合類型，但返回了多行數據。

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