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Using Queries with a Linked Database

Posted on 2013-01-10
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Last Modified: 2013-01-22
I'm building an application that manages a large amount if imported data and is used by a number of users. I have split the tables out from the rest of the application in the usual way, with the "Back End" parked up on the server.

Unfortunately, at the request of the user group, I can't embed the various queries in the code - as is my usual practice. Instead, the query names are stored in a table and executed in a sequence managed within that table.

Equally unfortunate, however, is that this methodology requires all of the queries to reside in the BACK END .accdb. In addition, any Make Table queries that are executed break the links to the back end tables and replace them with the new tables in the client .accdb.

Both of these are a royal pain in the neck!

Is there a way around this, assuming that use of the "DoCmd.OpenQuery strQueryName" method is something I am stuck with?

Thanks.
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Question by:Buck_Beasom
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LVL 61

Expert Comment

by:mbizup
ID: 38762616
Try this revision to your back-end queries:

SELECT YourField
INTO YourTable IN "C:\YourPath\YourTargetDBName.mdb"
FROM YourTable
'etc

Open in new window


You can use an IN clause to specify a given database.
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LVL 49

Expert Comment

by:Dale Fye
ID: 38763015
You might want to take a look at my article on Creating and Using Temporary Tables.

Additionally, you indicate that " this methodology requires all of the queries to reside in the BACK END .accdb"; this is not true. Although the Table containing the query names resides in the BE, the code (and queries) are still processed in the FE; the queries must reside in the Front End.

Also, if you are running ACTION queries (Make table, Append, Delete, Update) then you should not be using DoCmd.OpenQuery, you should be using the Execute method, like:

db.Execute strSQL, dbFailOnError

OR

db.QueryDefs("QueryName").Execute dbFailOnError
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Author Comment

by:Buck_Beasom
ID: 38774164
Fyed.

Thanks. Your comments helped, but before closing the question I would like some more input on the alternative query execution methods you provided. Why are these better for Action queries than DoCmd?

Thanks.
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Accepted Solution

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Dale Fye earned 2000 total points
ID: 38774233
Because the Execute method (which is available for both the database and querydefs) has an optional Options argument associated with it.  One of those options is 'dbFailOnError', which will raise an error if your query fails to execute (which is not the case with the RunSQL method).

Theoretically, if you check for the values in your fields, make sure they are the right data types, ... you should not have any errors when you run an Action query, but you NEVER know what a user might enter in a textbox, and the ability to trap for errors is the major advantage of using the Execute method.

HTH
Dale
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Author Closing Comment

by:Buck_Beasom
ID: 38806782
Thanks. I did notice that if I am executing a query that joins a query and a table, the query for the embedded SQL must be in the back end .accdb, but that is the only case.
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