Verify Null Value in DB2 Column Data Using COBOL Paragraph

In order to accomplish this, we will make use of NULL indicator after the SELECT query on the INVOICE_ID of the ORDERS table. If the NULL indicator has the value as -1 then we can conclude that INVOIVE_ID has a null value.

Below is a COBOL paragraph for this−

A010-CHECK-ORDER.
   EXEC SQL
   SELECT INVOICE_ID INTO :INVOICE_ID_DATA :INVOICE_ID_N
   FROM ORDERS
      WHERE ORDER_ID = ‘678542112’
   END-EXEC
   IF INVOICE-ID-N = -1
   MOVE SPACES TO INVOICE-ID-DATA
END-IF

INVOICE-ID-N is a null indicator here which is generated automatically by DCLGEN utility.