Assume that you want to replace the product number used for German products by the product number used in the U.S. The German products are in the table PRODUKTE(PR_NUMMER, PR_NAME, PR_PREIS). The IN-Port of the DB Lookup component contains those three attributes.
The table to perform the lookup of the U.S. product number is table LOOKUP_PRODUCTS(SOURCE, DESTINATION). The SOURCE column contains the German product numbers and the DESTINATION column contains the U.S. product number.
If no value for the German PR_NUMMER can be found in the LOOKUP_PRODUCTS, the current PR_NUMMER will be replaced by the string “INVALID”. A successful lookup will replace the German product number by the corresponding U.S. number.
To set up the DB Lookup Component for this example, choose:
Key Attribute: IN.PR_NUMMER
Value Attribute: IN.PR_NUMMER
Default Value: “INVALID”
Query: SELECT SOURCE, DESTINATION FROM LOOKUP_PRODUCTS
