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A Generic Cascade Update Procedure

Oracle Tips by Mike Ault

Enforcing a Cascade Update

--
-- main_table holds the name of the table that the update
-- cascades from.
--
-- table_name holds the name(s) of the tables to cascade the
update
-- into.
--
-- column_name is the name of the column in the target table(s)
to
-- update
 

Figure 1: Example DDL to create a cascade update source table.

The table by itself would be of little use. Since the data in the table is dynamic (i.e. multiple tables and columns that will need to be addressed) we must enable our trigger to be able to dynamically re-assign these values. The easiest way to do this is to create a set of procedures that utilizes the DBMS_SQL Oracle provided package to dynamically re-assign our update variables. Figure 2 shows the commented code for just such a procedure set. The set consists of two procedures, UPDATE_TABLES and UPDATE_COLUMN.

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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