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Target update override

By default,

Data Integration

updates target tables based on key values. However, you can override the default UPDATE statement for each target in a mapping. You might want to update the target based on non-key columns.

You can enter a target update override for relational and ODBC connections. For information on the specific steps to override the default target UPDATE statement, see the help for the appropriate connector.

Override the UPDATE statement in the Target transformation advanced properties. Enter the target UPDATE statement in the

Update Override

field. In some relational connections, you can generate the default UPDATE statement. Click

Configure

to generate the default UPDATE statement and then modify the statement.

Because the target fields must match the target column names, the update statement includes the keyword :TU to specify the fields in the target transformation. If you modify the UPDATE portion of the statement, you must use :TU to specify fields.

When you override the default UPDATE statement, you must enter an SQL statement that is valid for the database.

Data Integration

does not validate the syntax.

Example

A mapping passes the total sales for each salesperson to the T_SALES table.

Data Integration

generates the following default UPDATE statement for the target T_SALES:

UPDATE
  T_SALES
SET
  EMP_NAME = :TU.EMP_NAME,
  DATE_SHIPPED = :TU.DATE_SHIPPED,
  TOTAL_SALES = :TU.TOTAL_SALES
WHERE
  EMP_ID = :TU.EMP_ID

You want to override the WHERE clause to update records for employees named Mike Smith only. To do this, you edit the WHERE clause as follows:

UPDATE
  T_SALES
SET
  DATE_SHIPPED = :TU.DATE_SHIPPED,
  TOTAL_SALES = :TU.TOTAL_SALES 
WHERE
  :TU.EMP_NAME = EMP_NAME AND EMP_NAME = 'MIKE SMITH'

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Transformations

Transformations

Target update override

Target update override

Example