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php如何实现添加分类?
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- 2016-06-06 20:18:101656browse
添加分类 如果数据库里已经有了的就不要添加 怎么实现?
回复内容：
添加分类 如果数据库里已经有了的就不要添加 怎么实现?
1.判断是否存在
2.唯一索引,INSERT IGNORE INTO
<code>INSERT IGNORE INTO `tablename` (key,...) VALUES(...) </code>
3.replace
4.on duplicate key update
添加之前做个检测，如果有就return错误信息
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