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jsp中对mysql赋值问题

WBOY
Release： 2016-06-06 09:43:38
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mysqljsp语法

rs=sql.executeQuery("select * from user where username='"+username+"'");
这句话是在mysql中查找username的值为jsp中string变量username的值的记录。为啥要加这么多引号还有加号呢 不是很明白啊。求高手解答

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mysql jsp 语法
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