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Parameters for Order by in SQL?
Message
De
28/08/1998 13:32:40
 
 
À
28/08/1998 13:03:29
Information générale
Forum:
Visual FoxPro
Catégorie:
Autre
Divers
Thread ID:
00131023
Message ID:
00131087
Vues:
24
>>>I read a tip in July's Foxpro Advisor that you can use paramters for other than the where clause in an SQL view, fox example the Order by (provided you use the numeric construct, e.g. ORDER BY 2, instead of the field name). I couldn't get it to work however (got an error when I included ORDER BY ?testorde after setting testorde to 2 in the command window). Has anyone had any success or attempted this?
>>>
>>>I was intrigued by the idea as I'm trying to create an SQL for a report, but my users want to have flexibility in how it is ordered: Alphabetically, by District, or by Category. I don't want to create many different instances of the same SQL for this purpose. Perhaps I'm overlooking something obvious or another way to allow for this flexibility.
>>>
>>>I'd appreciate any ideas.
>>>
>>>TIA
>>>
>>>Sylvia
>>Sylvia,
>>I never done it with "?testorde" style but generally use numeric instead of field name (ie: select field1+field2+substr(field3,4,3) as somedata,* order by 1 works but not order by field1+field2+substr(field3,4,3) or somedata). If you would provide testorde just before the SQL then only replacing "?" with "&" would do the job :
testorder="2"
>>select * from mytable order by &testorder
Cetin
>
>Cetin -
>
>Thanks - this is interesting. I assume you concatenate your fields in this example because of your substring? When I was testing my original SQL for syntax, I was using ORDER BY field5, field4, field3, so didn't run into this problem, but this is good to know.
>
>Do you allow your users to select the way in which the result is ordered, i.e. by selecting the available fields in some way, then populating the 'testorder' variable with the result (that is what I am hoping to do) or do you let them choose between several sort options (e.g. 1, 2, or 3)?
>
>By the way, I vaguely remember that in using the Select AS clause in a program I wrote several years ago for a browse (I conveniently can't locate it now;), I created a fieldname containing two words which could be used as a header, e.g. "First Name" as opposed to simply "First". Perhaps this is selective memory or wishful thinking on my part, but it sure would be convenient now. Have you ever done anything like this?
>
>Sylvia

Sigh...this was 'wishful thinking'. I found my old code and what I was recalled was the :H parameter in BROWSE (Foxpro for DOS) which I used for headers.
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