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VBA Insert result from sql statement into a form of a field

Posted on 2014-10-17
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Last Modified: 2014-10-17
Hi,
I was hoping to get some help with the following code. I have a field that I need to populate with the result of a sql select statement. Cant seem to work

So when I click a button I need the field to be populated with the max of a value

Me.provid = DoCmd.RunSQL "select max(id) from ser_faxes_file"

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somehow it cant seem to work. I was reading a bit and noticed that docmd.runsql is not used for select statements. Not sure what to use.

thanks,
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Question by:damixa
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Jim Dettman (Microsoft MVP/ EE MVE) earned 500 total points
ID: 40386765
What you want is this:

Me.provid = DMax("[id]","ser_faxes_file")

 This is using a Domain function, of which there are several (DMax(), Dlookup(), etc).   All encapsulate a SQL statement and are intended to be used where SQL statements are not directly.

Your other option when working in code is to open a recordset, read the record(s) returned, and grab your values.

DoCmd.RunSQL

 is a statement used by itself to execute "action queries"; those that don't return records (such as appends, make table, updates, etc) but only execute.

 and instead of that, you're better off with using:

CurrentDB().Execute   <SQL statement>, dbFailOnError

 Because with the last argument, dbFailOnError, you can add error trapping and tell if something goes wrong.  You can't do that with RunSQL.

Jim.
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Author Comment

by:damixa
ID: 40386810
HI Jim,
That Me.provid = DMax("[id]","ser_faxes_file") Worked perfect.
I'm a newbie, but if I wanted to add 1 to the max, what would the syntax be?

thanks,
Vinnie
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Author Comment

by:damixa
ID: 40386816
I tried the Me.provid = DMax("[id]","ser_faxes_file")  +1 but got a type mismatch
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Author Comment

by:damixa
ID: 40386821
Actually, I got it to work. Thanks a ton.
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LVL 57
ID: 40386831
<<I tried the Me.provid = DMax("[id]","ser_faxes_file")  +1>>

If your doing this to generate a sequential number, be aware that DMax() can fail in a multi-user situation (it's possible for two users to end up with the same value.

Instead, you'd use a key generation procedure which locks a table allowing only one value to be generated at a time.

Jim.
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