| General Information |
| A varray is a variable length array object. |
| Related Data Dictionary Objects |
| col$
|
tab$
|
|
| dba_source |
all_source |
user_source |
| dba_types |
all_types |
user_types |
| dba_tables |
all_tables |
user_tables |
| dba_tab_cols |
all_tab_cols |
user_tab_cols |
| dba_nested_tables |
all_nested_tables |
user_nested_tables |
|
| System Privileges |
CREATE TYPE
CREATE ANY TYPE
DROP ANY TYPE |
| |
| Define Object as a TYPE |
CREATE OR REPLACE TYPE Project AS
OBJECT (
project_no NUMBER(2),
title VARCHAR2(35),
cost NUMBER(7,2));
/
desc project
SELECT type_name, typecode, instantiable
FROM user_types; |
| Define VARRAY of object type |
CREATE OR REPLACE TYPE ProjectList AS VARRAY(50)
OF Project;
/
desc projectlist
SELECT type_name, typecode, instantiable
FROM user_types; |
| Create table based on VARRAY |
Create relational table department,
which has a column of type ProjectList
CREATE TABLE department (
dept_id NUMBER(2),
name VARCHAR2(15),
budget NUMBER(11,2),
projects ProjectList);
desc department
set describe depth all linenum on indent on
desc department |
| Inserting into the VARRAY containing table |
Each item in column projects is a varray that will store
the projects scheduled for a given department.
Now, you are ready to populate relational table department.
In the following example, notice how varray constructor
ProjectList() provides values for column projects:
INSERT INTO department
VALUES(30, 'Accounting', 1205700,
ProjectList (Project(1, 'Design New Expense Report', 3250),
Project(2, 'Outsource Payroll', 12350),
Project(3, 'Evaluate Merger Proposal', 2750),
Project(4, 'Audit Accounts Payable', 1425)));
INSERT INTO department
VALUES(50, 'Maintenance', 925300,
ProjectList (Project(1, 'Repair Leak in Roof', 2850),
Project(2, 'Install New Door Locks', 1700),
Project(3, 'Wash Front Windows', 975),
Project(4, 'Repair Faulty Wiring', 1350),
Project(5, 'Winterize Cooling System', 1125)));
INSERT INTO department
VALUES(60, 'Security', 750400,
ProjectList (Project(1, 'Issue New Employee Badges', 13500),
Project(2, 'Find Missing IC Chips', 2750),
Project(3, 'Upgrade Alarm System', 3350),
Project(4, 'Inspect Emergency Exits', 1900)));
SELECT * FROM department; |
| Delete Record with VARRAY |
In the final example, you delete the Accounting Department
and its project list from table department:
DELETE FROM department WHERE dept_id = 30;
SELECT * FROM department; |
|