项目中查询用到了concat()拼接函数，在此查询中出现了拼接的字段为null的情况，拼接结果YRobpiBp为nwww.devze.comull在应用层报了空指针异常。
This question already has answers here: Recursive cast from SimpleXMLObject to Array (7 answers) 开发者_如何学运维Closed 7 years ago.
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