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  Oracle Tips by Burleson

Oracle 10g Tables of Final Objects Types

One of the differences between "normal" and "object" tables is that object tables have an object identifier that uniquely identifies every row in the table (not a rowid).

With object tables, the following situations can occur:

  • There is no need to unload and reload the object identifier; in this case, the external table only needs to contain fields for the attributes of the type for the object table (an object table is created from a type definition).
     

  • The object identifier needs to be unloaded and reloaded and the object identifier for the table has been defined as one or more fields in the table, (also known as primary key-based object identifiers). In this case, the external table has one column for every attribute of the type for the table.
     

  • The object identifier needs to be unloaded and the object identifier for the table is system-generated. In this case the procedure becomes more complex. In addition to a column for each of the attributes of the type, you need to add another column to hold the system-generated OID.

The following example demonstrates the third situation.

  1. First we create an object table with system-generated OIDs:

SQL> CREATE TYPE address_t AS OBJECT
 2 ( street_number     NUMBER,
 3 Street_name     VARCHAR2(30),
 4 suite_no     VARCHAR2(10),<
 5 City_name         VARCHAR2(32),
 6 State_or_provence     VARCHAR2(30),
 7 mail_code         VARCHAR2(20),
 
8 country       VARCHAR2(32))
 
9 NOT FINAL;

Type created.

SQL> CREATE TABLE addresses OF address_t;

Table created.

(By default object tables use system-generated object identifiers, so there is no need to specify any special clauses.)

SQL> INSERT INTO addresses VALUES ('1313','Mockingbird Lane','','Sweet Valley','California','99999','USA');

1 row created.


Get the complete story:

The above text is an excerpt from "Oracle Database 10g New Features: Reference for Advanced Tuning and Administration", by Rampant TechPress.  Written by top Oracle experts, this book has a complete online code deport with ready to use scripts. 

To get the code instantly, click here:

http://rampant-books.com/book_2003_2_oracle10g.htm


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