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Creating a Visual Basic 2008 dataset from an SQL Server 2008 data table that uses "Computed Column Specification" with formulas.

Posted on 2010-11-19
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Last Modified: 2013-12-08
         I am using Column properties in SQL Server 2008. I was all ready assisted with this in SQL and it works fine. Now I need to get it to work in a Visual Basic 2008 Data-Grid. I don’t necessarily need general help with “Add new data source” => Database => Connection String => Choose Table =>   Finish.  I don’t claim to be a pro, but I have created many Datasets and they all work fine in Visual Basic 2008 Standard edition. This Dataset “PayrollDataSet.xsd” looks fine after debug, and has no errors until you try to add a record. There are two records in it that were created in SQL, and all fields look good. My problem is that I can not create any new records in the Visual Basic program, although I can in SQL.

The Culprit:   3 columns that have formulas. 1) is simply adding two columns. 2) and 3) are what I call identities or mirrors of another column. Example: formula column 2) The company’s Social Security contribution is equal to the employee’s Social Security contribution.   SS_Co = SS    This all works fine in SQL, but not in a VB 2008 Data Grid.

1) Column name:  Total_PR_Liability        -    The formula   => ([GrossPay]+[Total_Co_Taxes])

2) Column name:  SS_Co        -    The formula   => ([SS])

3) Column name:  Medicare_Co        -    The formula   => ([Medicare])


The update fails and the error message is:    

The column”SS_Co” can not be modified because it is either a computed column or is the result of a UNION operator.

There is an identical error message line like this for each of the three formulas columns.
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Question by:jampost
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8 Comments
 

Author Comment

by:jampost
ID: 34176076
One note I might add is that is that no computed column uses any other computed column. If it did, it wouldn't work in SQL Server 2008.  
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LVL 27

Accepted Solution

by:
MikeToole earned 668 total points
ID: 34179558
I believe that the automatically generated insert/update statements include the computed columns - which is why the errors occur. This looks like a similar issue/fix:
http://stackoverflow.com/questions/951539/sqlcommandbuilder-and-sql-server-computed-columns-error
Hope this helps.
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LVL 83

Expert Comment

by:CodeCruiser
ID: 34179626
The Update, Insert, and Delete commands which are automatically generated by the DataAdapter are treating these computer columns as normal columns and trying to insert values into these columns. You need to manually write your Insert, Update commands for the dataadapter.

Above mentioned is a valid solution but this is another alternative

http://www.go4answers.com/Example/different-ways-insert-update-delete-30116.aspx
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Author Comment

by:jampost
ID: 34179762
Thank you both MikeTool, and CodeCruiser.  I am looking at both options.

Code Cruiser option looks a bit beyond my ability to transpose. It also looks like it might be in C#. I am using Visual Basic.


MikeTool I have removed the formulas from the computed columns. Are you saying that I can now write functional code (in the code view) to apply to these columns? Or Do I work in the Table adapter with a query?
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LVL 83

Assisted Solution

by:CodeCruiser
CodeCruiser earned 1332 total points
ID: 34179777
The code sample was in C# but you need to change SQL queries not VB code.

You can add computed columns to the datatable but you would struggle with as well since you are using typed datasets.
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Author Comment

by:jampost
ID: 34179824
OK Code cruiser,

     I am starting fresh. New data source, same data table without computed columns in a datagrid format in a Visual Basic windows form. Do I go to solution explorer to the dataset and configure the table adapter? Or do I work in SQL Server?   I have a feelling, if this works it will help a lot of people who read this.
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LVL 83

Assisted Solution

by:CodeCruiser
CodeCruiser earned 1332 total points
ID: 34179837
You can change the queries in codebehind using

Adaptername. Insertcommand. Commandtext = "sql query here"

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Author Closing Comment

by:jampost
ID: 34179847
Thank you for quality TechSupport.
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