简化SQL语句一例
举个例子,设表名为bbs 回复数的字段为renum 变量名$renum 记录序号字段为id 变量名$id
当我们在论坛回贴时会要改写主贴的回复数,传统的方法要用到到两句SQL语句:
//取出原值
$query1="select renum bbs where id = '$id'";
……
$renum ;
//写回数据库
$query2="update bbs set renum = '$renum' where id = '$id'";
简化后如下:
$query="update bbs set renum = renum 1 where id = '$id'";
一句搞定!

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