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Calculated Measure Representation

Calculated Measure Representation (Tabular)

 

Applies To: SQL Server 2016 Preview

A calculated measure is a named DAX expression evaluated every time it is used.

When using AMO to manage a tabular model calculated measure, there is a one-to-one match between the logical Calculated Measure object and a measure defined in a Command object of the MdxScript object. Each Calculated Measure is defined as a CREATE MEASURE expression inside a Command object and separated by a semicolon. All calculated measures in a tabular model correspond to the collection CREATE MEASURE string in one command object in a MdxScript object. For each calculated measure, there is one-to-one mapping with a CalculationProperty.

The following code snippet shows how to create a calculated measure.


        private void addCalculatedMeasure(
                           AMO.Cube modelCube
                         , string cmTableName
                         , string cmName
                         , string newCalculatedMeasureExpression
                     )
        {
            //Verify input requirements
            if (string.IsNullOrEmpty(cmName) || string.IsNullOrWhiteSpace(cmName))
            {
                MessageBox.Show(String.Format("Calculated Measure name is not defined."), "AMO to Tabular message", MessageBoxButtons.OK, MessageBoxIcon.Error);
                return;
            }
            if (string.IsNullOrEmpty(newCalculatedMeasureExpression) || string.IsNullOrWhiteSpace(newCalculatedMeasureExpression))
            {
                MessageBox.Show(String.Format("Calculated Measure expression is not defined."), "AMO to Tabular message", MessageBoxButtons.OK, MessageBoxIcon.Error);
                return;
            }

            StringBuilder measuresCommand = new StringBuilder();

            AMO.MdxScript mdxScript = modelCube.MdxScripts["MdxScript"];

            //ToDo: Verify if measure already exits and ask user what wants to do next

            if (mdxScript.Commands.Count == 1)
            {
                measuresCommand.AppendLine("-------------------------------------------------------------");
                measuresCommand.AppendLine("-- Tabular Model measures command (do not modify manually) --");
                measuresCommand.AppendLine("-------------------------------------------------------------");
                measuresCommand.AppendLine();
                measuresCommand.AppendLine();
                mdxScript.Commands.Add(new AMO.Command(measuresCommand.ToString()));

            }
            else
            {
                measuresCommand.Append(mdxScript.Commands[1].Text);
            }
            measuresCommand.AppendLine(string.Format("CREATE MEASURE '{0}'[{1}]={2};", cmTableName, cmName, newCalculatedMeasureExpression));


            mdxScript.Commands[1].Text = measuresCommand.ToString();


            if (!mdxScript.CalculationProperties.Contains(cmName))
            {
                AMO.CalculationProperty cp = new AMO.CalculationProperty(cmName, AMO.CalculationType.Member);
                cp.FormatString = ""; // ToDo: Get formatting attributes for the member
                cp.Visible = true;
                mdxScript.CalculationProperties.Add(cp);
            }

            try
            {
                modelCube.Update(AMO.UpdateOptions.ExpandFull, AMO.UpdateMode.UpdateOrCreate);
                MessageBox.Show(String.Format("Calculated Measure successfully defined."), "AMO to Tabular message", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
            catch (AMO.OperationException amoOpXp)
            {
                MessageBox.Show(String.Format("Calculated Measure expression contains syntax errors, or references undefined or missspelled elements.\nError message: {0}", amoOpXp.Message), "AMO to Tabular message", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                return;
            }
            catch (AMO.AmoException amoXp)
            {
                MessageBox.Show(String.Format("AMO exception accessing the server.\nError message: {0}", amoXp.Message), "AMO to Tabular message", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                return;
            }
            catch (Exception)
            {
                throw;
            }
        }


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