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Using Object IDs (OIDs) in Oracle 8

Oracle Tips by Mike Ault

Using REF, DEREF and VALUE

REF and DEREF are Oracle supplied routines that allow a developer to explicitly reference an object instance. The call to REF returns the OID of the object instance. An OID is a 128 byte base 64 number which isn't very useful except as a handle to the object instance. To get the value or values stored in the instance that is referred to by a REF the DEFREF routine is utilized. DEREF returns the values in the object instance referenced by a specific REF value.

REFs are used to establish relationships between two object tables much like a primary key-foreign key relationship in relational tables. However, relational tables have difficulty if you have to have more than one table related in a primary/foreign key relationship to a single table. An example would be an address table that is used to store addresses from several entities. The use of REFs eliminates this problem since an unscoped REF can refer to any object table that is accessible.

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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