MySQL中时间类型的比较datediff
在PHP项目开发中，经常遇到自动判断一些记录过期的情况，过期自然涉及到时间的比较。现有的数据库中有一个自动更新时间timestamp
在PHP项目开发中，，经常遇到自动判断一些记录过期的情况，过期自然涉及到时间的比较。现有的数据库中有一个自动更新时间timestamp类型字段，根据这个时间和系统当前时间比较，超过7天的更新另一个字段的值。可以直接使用如下SQL语句：
update testtable set status=2 where datediff(now(),testtime)>7 and status;
DATEDIFF() 返回起始时间 expr和结束时间expr2之间的天数。Expr和expr2 为日期或 date-and-time 表达式。计算中只用到这些值的日期部分。
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