Anonymous Blocks

2017-12-12

Intermediate

15 min.

Leveraging SQLScript in Stored Procedures & User Defined Functions

You will learn

In this exercise we will show you how you can invoke SQLScript logic without the need to create a persistent logic container such as a procedure or function. Instead we will use so called anonymous blocks.
Please note - This tutorial is based on SPS11

Prerequisites

Tutorials: Debugging Stored Procedures

Step 1: Create anonymous block

From the HRTT page, click the “SQL Console” button

To have an anonymous block you need a do begin … end. Enter the this code in the SQL tab.

Step 2: Add body of statement

Copy the logic from the procedure get_po_header_data into the body. Make sure to only copy the code between the BEGIN and END statements

Step 3: Declare required variable

Let’s assume the application executing this block only allows string types. Since we have no signature for defining this we are simply declaring the type of the table variable EX_TOP_3_EMP_PO_COMBINED_CNT. The columns will then be implicitly converted to the corresponding types. Between the BEGIN statement and the first SELECT statement, enter a DECLARE statement to declare an intermediate table variable called EX_TOP_3_EMP_PO_COMBINED_CNT as shown

Step 4: Insert additional SELECT

After the last SELECT statement and before the END statement, insert another SELECT against the intermediate table variable which you declared above

Step 5: Check complete code

The completed code should look very similar to this. If you do not wish to type this code, you can reference the solution web page at http://<hostname>:51013/workshop/admin/ui/exerciseMaster/?workshop=dev602&sub=ex2_16

DO
BEGIN

DECLARE EX_TOP_3_EMP_PO_COMBINED_CNT TABLE (
           "FULLNAME" NVARCHAR(256),
           "CREATE_CNT" BIGINT,
           "CHANGE_CNT" BIGINT,
           "COMBINED_CNT" BIGINT);

po_create_cnt =  SELECT COUNT(*) AS CREATE_CNT, "HISTORY.CREATEDBY.EMPLOYEEID"  AS EID
     FROM "dev602.data::PO.Header" WHERE PURCHASEORDERID IN (
     SELECT PURCHASEORDERID
         FROM "dev602.data::PO.Item"
WHERE "PRODUCT.PRODUCTID" IS NOT NULL)
GROUP BY  "HISTORY.CREATEDBY.EMPLOYEEID";

po_change_cnt =  SELECT COUNT(*) AS CHANGE_CNT, "HISTORY.CHANGEDBY.EMPLOYEEID" AS EID
     FROM "dev602.data::PO.Header"  WHERE PURCHASEORDERID IN (
   SELECT PURCHASEORDERID
           FROM "dev602.data::PO.Item"
WHERE "PRODUCT.PRODUCTID" IS NOT NULL)
GROUP BY  "HISTORY.CHANGEDBY.EMPLOYEEID";

EX_TOP_3_EMP_PO_COMBINED_CNT =
      SELECT "dev602.procedures::get_full_name"( "NAME.FIRST", "NAME.MIDDLE", "NAME.LAST") as FULLNAME, crcnt.CREATE_CNT, chcnt.CHANGE_CNT, crcnt.CREATE_CNT + chcnt.CHANGE_CNT AS COMBINED_CNT
  FROM "dev602.data::MD.Employees" as emp
  LEFT OUTER JOIN :PO_CREATE_CNT AS crcnt
           ON emp.EMPLOYEEID = crcnt.EID
 LEFT OUTER JOIN :PO_CHANGE_CNT AS chcnt
         ON emp.EMPLOYEEID = chcnt.EID
    ORDER BY COMBINED_CNT DESC LIMIT 3;

Select * from :EX_TOP_3_EMP_PO_COMBINED_CNT;

END;

Step 6: Run and check results

Click Run.

You will notice that the SQLScript code is executed and results are shown. Again, there is no procedure or function created here, just the SQLScript being executed by the engine.