JPA之.getSingleResult()异常"No entity found for query" - 代码天地

JPA之.getSingleResult()异常"No entity found for query"

企业开发 2018-05-12 06:41:41 阅读次数: 0

    在使用EJB3.0的JPA2.0技术的时候，遇到了一个很蛋疼的问题。
    很久以前一直用EntityManager下getResultList()查询数据，即便一个数据亦是如此，所以要频繁的List.get(0)。新街口getSingleResult()出现了，然后就开始频繁报异常。“No entity found for query
     在getSingleResult的源码里有这样一句： @throws EntityNotFoundException if there is no result
也就是说，查不到结果时，它是抛异常的，不会返回null..。

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转载自phl.iteye.com/blog/1990651

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