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MySQL problem with parameters
Message
From
04/03/2010 19:43:13
 
General information
Forum:
Visual FoxPro
Category:
Databases,Tables, Views, Indexing and SQL syntax
Environment versions
Visual FoxPro:
VFP 8 SP1
Miscellaneous
Thread ID:
01452040
Message ID:
01452660
Views:
47
>>I have a MySql table with a DateTime field. I want to get all the records for today.
>>ldDate = DATE()
>>=SQLEXEC(lnHandle,"SELECT * FROM myTable WHERE dtField = ?ldDate")
>>This produces no records, which is expected since I'm not accounting for the time portion of the field. But when I tried
>>=SQLEXEC(lnHandle,"SELECT * FROM myTable WHERE DATE(dtField) = ?ldDate")
>>I also got no records back. When I tried
>>ldDate = DATE()
>>lcDate = TRANSFORM(DTOS(ldDate),"@R 9999-99-99")
>>=SQLEXEC(lnHandle,"SELECT * FROM myTable WHERE DATE(dtField) = ?lcDate")
>>I got the records I wanted.
>>
>>Could somebody tell me why passing a Date value doesn't work while passing a character representation of the date does work?
>>
>>Thanks............Rich
>
>Use lower range and upper range instead, e.g.
>
>ldStartDate = Date()
>ldEndDate = date() + 1
>
>=SQLEXEC(lnHandle,"SELECT * FROM myTable WHERE dtField >= ?ldStartDate and dtField < ?ldEndDate")
Thanks for responding. Sorry for delayed acknowledgement.

It's possibly an instance of NIH syndrome ......... but I prefer my kludge (convert to a character representation of a date) to yours. I think it shows the desired result more clearly. I also discovered that
ldDate = DATE()
SQLEXEC(lnHandle,"SELECT * FROM myTable WHERE DATE(dtField) = CAST(?ldDate as date)")
also works. I don't know which is the fastest expression (and don't think the difference would be at all significant) but I think this is the most clear, but that's a subjective opinion.
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