Delete records : Ref « Object Oriented Database « Oracle PL / SQL

1. Oracle PL / SQL
2. Object Oriented Database
3. Ref

Delete records

 


SQL> CREATE OR REPLACE TYPE address_obj as OBJECT(
  2        street VARCHAR2(20),
  3        city VARCHAR2(20),
  4        state CHAR(2),
  5        zip CHAR(5));
  6  /

Type created.

SQL>
SQL> CREATE TABLE address_table OF ADDRESS_OBJ;

Table created.

SQL>
SQL> INSERT INTO address_table VALUES (ADDRESS_OBJ('1 A St.','Mobile','AL','36608'));

1 row created.

SQL>
SQL> CREATE TABLE client (name VARCHAR2(20),
  2    address REF address_obj scope is address_table);

Table created.

SQL>
SQL> INSERT INTO client SELECT 'Walsh', REF(aa) FROM address_table aa;

1 row created.

SQL>
SQL>
SQL> -- SELECTing Individual Columns in TCROs
SQL>



SQL>
SQL>
SQL> -- Deleting Referenced Rows
SQL>
SQL>
SQL> SELECT * FROM address_table;

STREET               CITY                 ST ZIP
-------------------- -------------------- -- -----
1 A St.              Mobile               AL 36608


SQL>
SQL> -- Now delete a row from Address_table:
SQL>
SQL> DELETE FROM address_table WHERE zip = '32563';

0 rows deleted.

SQL>
SQL> -- And now, SELECT from the Client table that contains a reference to the Address_table:
SQL>
SQL> SELECT * FROM client;

NAME      ADDRESS
--------- --------------------------------------------------
Walsh     0000220208707EBDF1B9E344FDB604B14DA624CBA048316BEA
          1E2D4128AC1F28472E126764


SQL>
SQL> SELECT name, DEREF(address)
  2  FROM client;

NAME
---------
DEREF(ADDRESS)(STREET, CITY, STATE, ZIP)
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Walsh
ADDRESS_OBJ('1 A St.', 'Mobile', 'AL', '36608')


SQL>
SQL>
SQL>
SQL> drop table client;

Table dropped.

SQL>
SQL> drop table address_table;

Table dropped.

SQL>
SQL>
SQL>
           
         
  

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