我看到在 MySQL 中有 Cast()
和 Convert()
函数可以从值创建整数,但是有没有办法检查一个值是整数吗?我正在寻找像 PHP 中的 is_int()
之类的东西.
I see that within MySQL there are Cast()
and Convert()
functions to create integers from values, but is there any way to check to see if a value is an integer? Something like is_int()
in PHP is what I am looking for.
我假设您要检查字符串值.一种不错的方法是 REGEXP 运算符,将字符串与正则表达式匹配.简单做
I'll assume you want to check a string value. One nice way is the REGEXP operator, matching the string to a regular expression. Simply do
select field from table where field REGEXP '^-?[0-9]+$';
这相当快.如果您的字段是数字,只需测试
this is reasonably fast. If your field is numeric, just test for
ceil(field) = field
相反.
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