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php连mysql,并取数据。该怎么解决

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WBOYOriginal
2016-06-13 12:36:49815browse

php连mysql,并取数据。
php怎么在mysql数据库中判断一条数据是否存在,存在的话取出该条数据??求代码实例。

mysql php 数据库 实例
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