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Building an SQL statement using access forms and VB.

Posted on 2006-11-27
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Last Modified: 2010-04-17
Hi Experts!

I have an access form that has serach critera fileds taken from the user.  I want to then efficently build an SQL string in VB.  

How does one intelligently build an SQL statement from the fields they provide?  To be more concrete about what I am asking; If I have say 10 possible criteria that I want to use in the SQL statement and I am collecting this from the user, I could have potentially 2^10 possible combinations of searches.  How do I build the statement programmatically without writing out a separate SQL statement for every possible combination of search criteria that the user could enter?

Many Thanks!

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Question by:travishaberman
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4 Comments
 
LVL 4

Expert Comment

by:hclgroup
ID: 18020752
where
(form.field1 = NULL OR table.column1 = form.field1) AND
(form.field2 = NULL OR table.column2 = form.field2) AND
etc.

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LVL 44

Accepted Solution

by:
Arthur_Wood earned 500 total points
ID: 18021026
in code, build the where clause like this:

Dim strWhere as String

If txtField1.Text <> "" then
    strWhere = " Where Field1 = '" & txtField1.Text & "'"
End If

If txtField2.Text <> "" then
   If strWhere = "" then
       strWhere = " Where Field2 = '" & txtField2.Text & "'"
   Else
       strWhere = " AND Field2 = '" & txtField2.Text & "'"
   End If
End If

If txtField3.Text <> "" then
   If strWhere = "" then
       strWhere = " Where Field3 = '" & txtField3.Text & "'"
   Else
       strWhere = " AND Field3 = '" & txtField3.Text & "'"
   End If
End If

and so on.  You should be able to see tha pattern.

AW
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Author Comment

by:travishaberman
ID: 18022479
Many thanks!
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LVL 44

Expert Comment

by:Arthur_Wood
ID: 18028919
glad to be of assistance.
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