SQLite Problem in 4.5

Bob Sneidar bobs at twft.com
Mon Nov 15 18:49:26 EST 2010


I don't think it is a bug. Since the NULL's are embedded into the SQL result, when LiveCode sees them it thinks it's an EOF of some kind (help me out Jacque wasn't this discussed in an earlier thread)? 

If you had queried each column as is, then concatenated them in LiveCode, I think you would have gotten all the data. I think the query IS working, but the NULL in the cursor is being interpreted by LiveCode as an end of data marker. Should it be? I will leave that to bigger minds than mine. I think this behavior is a backwards compatibility issue with Metacard stacks or something. I vaguely remember this being discussed a few months ago. But I could be wrong. Well... not really. ;-)

Bob


On Nov 15, 2010, at 3:12 PM, Peter Haworth wrote:

> Avoiding NULLs is always good I think.  But since SQLite itself works fine with them and LiveCode doesn't, this feels like a bug to me.  Should I enter it at the QCC?
> 
> Pete Haworth
> 
> On Nov 15, 2010, at 3:06 PM, Bob Sneidar wrote:
> 
>> Ah hah! Nice catch. I thought Rev was supposed to interpret NULL as empty string, but with the concatenation, I suppose the NULL's would be embedded in the returned pseudo column (probably not the right word for it). That is a nice little gotcha there for anyone running this kind of query. Moral to story: avoid NULL values in LiveCode SQL databases?
>> 
>> Bob
>> 
>> 
>> On Nov 15, 2010, at 2:58 PM, Peter Haworth wrote:
>> 
>>> Thanks Bob.  I think the problem may have something to do with NULL values in some of the columns coming back from the SELECT.  When I fixed them, the SELECT worked fine in LiveCode.  The Firefox plugin was one of the utilities I used to check this out and it returned all the data correctly, even when there were NULLs in the columns.
>>> 
>>> Pete Haworth
>> 
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