Using TempDB Tables in AX 2012 Forms

by | Updated August 15, 2016 | Development, Dynamics AX

Having temporary tables stored in the tempDB database is a feature new to AX 2012.  It isn’t difficult to use temporary tables to populate forms but the steps deviate from using InMemory temporary tables with forms.  Given that difference, I thought I would document here how to use tempDB tables as datasources in AX 2012 forms.

1. Create a temporary table with the fields required.  In the property sheet for the table set the TableType property to TempDB.

2. Create a class to populate the temporary table.  For example, in step #1 create a table named TempDBEXampleTable.  Then create a class with a method that populates and returns a populated TempDBExampleTable:

3. Create a form and add the TempDBExampleTable as the datasource to the form.

4. In the classDeclaration of the form declare an instance of the TempDBExampleTable table.  (This step isn’t required but this is how I chose to build my form.)

5. In the init method of the form datasource instantiate the class you created in step #2.

6. Still in the datasource’s init method, call the method created in step #2 to populate the temporary table and set the class variable equal to what the method returns.

7. Still in the datasource’s init method, from the buffer for the datasource call the linkPhysicalTableInstance method and pass it the populated temporary table returned in step #6.  The code for the datasource’s init method should look something like this:


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  1. LennyK

    Hi Becky, I tried this approach, but on the line:

    I get a compiler error saying that “Variable TempDBExampleTable has not been declared”

  2. LennyK

    Sorry, on the above example, I realized that TempDBExampleTable is actually the name of the DataSource on the Form and not your temporary table type. That worked, thanks!

  3. Brandon Carmichael

    Hello LennyK,

    Thank you for your comments – glad it worked for you as expected.


  4. Srikanth

    Hi Becky,
    Thanks for the detailed steps. It really helped me a lot.

  5. Srikanth

    This is good if the form opens without any parameters. But, how does it work when you have to populate the temp table based on the parameters on the form like for example on the button click.

  6. Michael Tweiten

    Hi Srikanth,

    We would recommend creating a separate dialog form that grabs parameters from the user, sets parameter methods on a class, populates a temp table, and opens a second form. The second form would then use the temp table.
    Let me know if you have anymore questions.


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