Re: question about null
Re: question about null
- Subject: Re: question about null
- From: Todd Ransom <email@hidden>
- Date: Thu, 1 Mar 2007 17:00:22 -0500
try:
if ([value isKindOfClass: [NSNull class]])
Todd Ransom
Return Self Software
http://returnself.com
On Feb 27, 2007, at 5:58 PM, Glenn Zelniker wrote:
I am using a SQLite database and I have a query that returns a
string that may be stored in the database as NULL (not nil or
NSNull -- rather, the NULL value that's specific to SQL). I am
trying to detect the NULL return value programatically. When I
NSLog the value to the Run Log, it prints out as <null>. How can I
test for this condition programatically? I've tried
if (value == nil)
if (value = NULL)
if ([value isEqualToString:@""]);
if (value == [NSNull null]);
and none of these seems to work. I'm puzzled. Perhaps the SQL part
of my explanation is a red herring. Let me rephrase. I have an
NSString called *value. If I do the following:
NSLog(@"%@", value),
I get the following output in the Run Log: <null>
How can I test "value" to catch the condition where value != nil
and yet logging value results in <null> ?
Glenn Zelniker
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