----- Original Message ----- From: "Alan Williamson" <[EMAIL PROTECTED]> To: "Jigal van Hemert" <[EMAIL PROTECTED]> Sent: Wednesday, March 31, 2004 2:05 PM Subject: Re: CURDATE() bug?
> Jigal van Hemert wrote: > > > > NOT A BUG!!! > > > > In the manual it is stated that CURDATE() returns either YYYY-MM-DD or > > YYYYMMDD depending on the context. > > So in the context of addition with an integer it will return YYYYMMDD which > > is automatically cast to integer when adding either 0 or 1. > > sorry ... but disagree with you, it is a bug. Casting is a very > dangerous business at the best of times. It is a bug. Its a hack. But > hacks can be good. However, one can't make assumptions on hacks. The > documentation is not clear at all in this area. The value in which you > cast is important; so your assumption that 0 or 1 makes no difference is > incorrect. > > Simply an addition to the documentation to clarify that this is purely a > formatting hack and should not be used to do date addition would satisfy > all. RTFM! It gives you plenty of examples for manipulating dates and the output of of curdate() is clearly stated with examples. No-one can help it that you don't like it the way it is. You provided the same example as the manual (CURDATE() + 0) and got the same result as the manual says. Then you do an addition and you're surprised that the result is an integer? Have you tried something like SELECT '1tt' +2; ? The result may be a surprise for you (3), but if you read the manual about how MySQL handles types (e.g. http://www.mysql.com/doc/en/String_comparison_functions.html) it is expected behaviour and not a bug IMHO. The fact that something takes different values in different contexts is not very strange. Languages such as Perl will give you various examples. The +0 is not a hack, but provides a numerical context for the function CURDATE(), which modifies its behaviour. Regards, Jigal. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]
