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2019 November Release

Accessing the transaction contextPermanent link for this heading

The cootx variable can be used to access the current transaction context. The most important methods of a transaction are listed in chapter “Accessing the transaction context”.

In some scenarios it is necessary to carry out operations in a separate transaction. Any changes that have been made in a new transaction can be committed or rolled back separately from the main transaction.

Example

usecase CreateInvoice() {
  variant Order {
    impl = expression {
      // Create a new transaction
      interface @extension = coort.GetExtension();
      transaction @localtx = @extension.CreateTransaction();
      transaction @backuptx = cootx;

      try {
        coort.SetThreadTransaction(@localtx);

        Invoice @invoice = #Invoice.ObjectCreate();
        @invoice.APPDUCXSAMPLE_200_300_InitializeInvoice();

        @localtx.Commit();
      }
      catch (error) {
        @localtx.Abort();
      }
      finally {
        // Restore original transaction context
        coort.SetThreadTransaction(@backuptx);

        // Clear the variables holding the transactions
        @backuptx = null;
        @localtx = null;
      }
    }
  }
}

Note: A better and simpler way to create transactions is using the try new transaction statement. Please refer to chapter 14.10.5 “Creating new transactions or opening a transaction scope” for further information.

Working with transaction variablesPermanent link for this heading

Syntax

// Retrieving the value stored in a transaction variable
value = #TV.reference;

// Storing a value in a transaction variable
#TV.reference = value;


The #TV object is a special object that provides access to transaction variables.

Note: Transaction variables can also be accessed using the cootx variable. Please refer to chapter “Predefined variables” for further information.

Example

// Retrieving the value stored in a transaction variable
@printinvoice = #TV.TV_PRINTINVOICE;

// Storing a value in a transaction variable
#TV.TV_INVOICE = cooobj;

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