【java.sql.SQLException: Before start of result set】

将ResultSet转换为 Map<String,String>时抛出了一个这样的异常:java.sql.SQLException: Before start of result set

网上上查了下,说是必须这么写:
1 while (rs.next()){
2 
3     ...    ...
4 }

具体为什么必须这么写呢?stackoverflow上面的以为阿三大兄弟给出了答案:

Would it be safe to use result.next() or result.first() when executing a simple COUNT query because it should never be null and will only ever be 1 result.

翻译:使用 result.next() or result.first() 为了保证安全,因为它永远不应该为null并且只会是1结果;

原文地址:https://stackoverflow.com/questions/2120255/resultset-exception-before-start-of-result-set

吐槽:浓浓的咖喱味英语  呕~~~

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转载自www.cnblogs.com/Eillot/p/9487460.html
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