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A Generic Cascade Update Procedure

Oracle Tips by Mike Ault

The Cascade Update Procedures

Use of the DBMS_SQL package to dynamically build the table update command on the fly allows the same set of procedures to be used for any set of master-dependent tables that have entries in the source table.

The UPDATE_TABLES procedure accepts the master table name, the old value for the column to be updated and the new value for the column. The procedure uses a standard cursor fetch to retrieve the dependent table names and dependent table column names from the source table shown in figure 1. If desired, the table from figure 1 could be altered to accept an ordering value for each master-dependent set to allow the cascade update to be done in a specific order if required. Using this information and the new and old values for the column from the trigger call, the UPDATE_COLUMN procedure dynamically rebuilds the table update command to update the appropriate tables.

-- First create package body
-- Decided to use package so that all procedures will
-- be in one place and very controllable
-- M. Ault 1/14/97 Rev 1.0
--
CREATE OR REPLACE PACKAGE cascade_update AS
--
-- First package is update_column
-- This package actually does the work
-- using DBMS_SQL to dynamically rebuild the
-- UPDATEs at run time for each table.
--


SEE CODE DEPOT FOR FULL SCRIPTS


For more information on this topic, I recommend Don Burleson's latest book "Oracle Tuning: The Definitive Reference". 

You can buy it direct from the publisher for 50%-off and get instant access to the code depot of Oracle tuning scripts:

http://www.rampant-books.com/book_1002_oracle_tuning_definitive_reference_2nd_ed.htm


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