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Updating tables in access

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Alias ID is the primary key and is also autonumbered.

Product ID is linked to the Product ID field in the Products table in a one to many relationship.

I’ve been seeing a lot of talk lately about linked SQL Server tables…ever since I’ve started this blog I’ve address it several times, but there have been some changes since my last diatribe that warrant revisiting the issue again. In the old days some developers would use unbound forms and elaborate code to read/write to SQL Server, and for good reasons: Linked tables will allow you to bind your forms and make it easier to design and use them, run queries in Access and use lookup tables. There are several issues you need to be aware of when using linked tables.

Linked tables are a great way to leverage SQL Server in your app.

There are circumstances where storing a calculated result makes sense - typically where you need the flexibility to store a different value sometimes.

Say you charge a construction fee that is normally an additional 10%, but to win some quotes you may want to waive the fee. In this case it makes perfect sense to have a record where the fee is

I ran into problems updating the table directly using an UPDATE statement, however, so I tried a different approach, and so far have no luck there either. The first one is NEVER use a combination of linked tables with local tables in your queries.Instead download the server side tables as temp tables in your app or upsize your local tables to SQL Server and do the processing on the server in it’s entirety.The code, minus exception-handling bits, looks like: Ole Db Data Adapter data Adapter = new Ole Db Data Adapter(); Data Set user Data = new Data Set(string. Remove(param User ID); // modify Data Table data user Data. Never store a value that is dependent on other fields: it's a basic rule of normalization.

instead of 10%, so you must store this as a field in the table.

To achieve this, use the After Update event of the controls on your form to automatically calculate the fee: Now whenever the Quantity or Unit Price changes, Access automatically calculates the new fee, but the user can override the calculation and enter a different fee when necessary.

updating tables in access-68updating tables in access-61updating tables in access-58

I ran into problems updating the table directly using an UPDATE statement, however, so I tried a different approach, and so far have no luck there either.

The first one is NEVER use a combination of linked tables with local tables in your queries.

Instead download the server side tables as temp tables in your app or upsize your local tables to SQL Server and do the processing on the server in it’s entirety.

The code, minus exception-handling bits, looks like: Ole Db Data Adapter data Adapter = new Ole Db Data Adapter(); Data Set user Data = new Data Set(string.

Remove(param User ID); // modify Data Table data user Data.