Generate Last Updated Table

Intermediate/Generate Last Updated table.csx

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+/*
+ * Title: Generate Last Updated table
+ * 
+ * Author: Irfan Charania
+ * 
+ * There are times when you want to know when your model was last processed at the table level.
+ * SSAS Tabular does not provide an easy built-in way to do this.
+ * 
+ * This script, when executed, will loop through all the tables in the model,
+ * and 
+ * 1. create (or update) a hidden "Last Processed" calculated column, and
+ * 2. create (or update) a "Last Updated Tabular" calculated table containing data 
+ *    from the above calculated column
+ * 
+ * Ref: https://www.sqlbi.com/articles/last-process-date-in-ssas-tabular/
+ */
+
+// Edit these values as desired 
+var columnName = "Last Processed";
+var tableName = "Last Updated Tabular";
+var dateFormatString = "yyyy-MMM-dd h:mm AM/PM";
+
+// ---------------------------
+// 1. create (or update) a hidden "Last Processed" calculated column
+// ---------------------------
+
+// Loop through all tables in model
+foreach(var table in Model.Tables) {
+
+    // for all non-calculated tables
+    if (table.SourceType.ToString() != "Calculated" ){
+
+        CalculatedColumn column;
+
+        // if calculated column does not exist, create one
+        if (!table.Columns.Contains(columnName))
+        {
+            column = table.AddCalculatedColumn(
+                "Last Processed",  // Name
+                "NOW()",           // DAX Expression
+                "_Debug"           // Display Folder
+            );
+        }
+        // else retreive the calculated column
+        else{
+            column = (CalculatedColumn)table.Columns[columnName];
+        }
+
+        // and update it's properties
+        column.DataType = DataType.DateTime;
+        column.IsHidden = true;
+        column.FormatString = dateFormatString;
+        column.Description = "Shows when SSAS table was last processed";
+    }
+}
+
+// ---------------------------
+// 2. create (or update) a "Last Updated Tabular" calculated table 
+//    containing data from the above calculated column
+// ---------------------------
+
+List<string> rowsList = new List<string>();
+
+
+// Loop through all tables in model
+foreach(var table in Model.Tables) {
+
+    // if calculated column exists
+    if (table.Columns.Contains(columnName))
+    {
+        // create DAX row expression to create row data
+        var s = String.Format(@"
+    ROW (
+        ""Last Processed"", FORMAT ( MAX ( {0} ), ""{1}""),
+        ""Table Name"", ""{2}""
+    )"
+                , table.Columns[columnName].DaxObjectFullName
+                , dateFormatString
+                , table.Name);
+
+        // add row expression to list
+        rowsList.Add(s);
+    }
+}
+
+// Combine all row statements into a single DAX expression
+var rows = String.Join(", ", rowsList);
+var expression = String.Format("UNION ( {0} )", rows);
+
+CalculatedTable tbl;
+
+// If calculated table already exists, retreive it
+if (Model.Tables.Contains(tableName)){
+    tbl = (CalculatedTable)Model.Tables[tableName];
+}
+// else add new calculated table to the model
+else{
+    tbl = Model.AddCalculatedTable(tableName);
+}
+
+// update calculated table's expression to earlier-built DAX expression
+tbl.Expression = expression;