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Home Backend Development PHP Tutorial php中关于sql拼接时标点符号出现的问题

php中关于sql拼接时标点符号出现的问题

Jun 23, 2016 pm 01:57 PM
php sql Splicing Punctuation

初学php,遇到了个奇怪的问题,让大侠们见笑了,拼接语句如下:

 $sql = 'select cat_id,cat_name,parent_id from ' . $this->table . ' where parent_id=' . $id;//能通过,正解  $sql = 'select cat_id,cat_name,parent_id from' . $this->table . 'where parent_id=' . $id;
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为啥符号的空位不同,拼接的结果会有差异, 不解中,求解答?


回复讨论(解决方案)

你把两句输出之后对比下就知道了。
第一句.... from table where...
第一句.... fromtablewhere...

第二句中from 、table和where连在一起了,还能正确吗?

select cat_id,cat_name,parent_id fromcategorywhere parent_id=42delete from category where cat_id=42
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跑的太快了,基础没打好,谢谢版主提醒!

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