Oracle VARRAY

Oracle VARRAY Version 21c

General Information

Library Note

Morgan's Library Page Header

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Purpose A varray is a variable element array object. Memory to store varrays is taken from the PGA.

AUTHID CURRENT_USER

Dependencies

ALL_NESTED_TABLES	CDB_SOURCE	DBA_SOURCE
ALL_SOURCE	CDB_TYPES	DBA_TYPES
ALL_TYPES	CDB_VARRAYS	DBA_VARRAYS
ALL_VARRAYS	COL$	PLITBLM
CDB_NESTED_TABLES	DBA_NESTED_TABLES	TAB$

Documented Yes

First Available Not Known

Object Privileges GRANT EXECUTE ON

CREATE OR REPLACE NONEDITIONABLE TYPE uwclass.uwvarray AS

      VARRAY(32767) OF VARCHAR2(32767);

      

      GRANT EXECUTE ON uwclass.uwvarray TO sys;

System Privileges

ALTER ANY TYPE	CREATE TYPE	EXECUTE ANY TYPE
CREATE ANY TYPE	DROP ANY TYPE	UNDER ANY TYPE

Non-Object SQL

Define VARRAY as a TYPE CREATE OR REPLACE TYPE uwvarray AS VARRAY(5) OF NUMBER; / desc uwvarray CREATE TABLE varraytab ( oddt_col VARCHAR2(20), udva_col uwvarray); desc varraytab

Object SQL

Define Object as a TYPE CREATE OR REPLACE TYPE Project AUTHID DEFINER 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 with a VARRAY column -- create relational table department, which has a column of type ProjectList

CREATE TABLE department ( dept_id NUMBER(2), dname 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.
-- next populate relational table department. Then the 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))); COMMIT; SELECT * FROM department;

Delete Record with VARRAY -- in the final example, delete the Accounting Department and its project list from table department

DELETE FROM department WHERE dept_id = 30; SELECT * FROM department;

PL/SQL

Delete Record with VARRAY CREATE OR REPLACE TYPE Project IS OBJECT ( project_no NUMBER(2), title VARCHAR2(35), cost NUMBER(7,2)); / DECLARE TYPE ProjectList IS VARRAY(50) OF Project; demo_t ProjectList; BEGIN NULL; END; / -- the following generates an error DECLARE TYPE ProjectList IS VARRAY(50) OF Project; demo_t ProjectList; BEGIN demo_t(1) := Project(1,'One',1); END; / set serveroutput on DECLARE TYPE ProjectList IS VARRAY(50) OF Project; demo_t ProjectList; BEGIN demo_t := ProjectList(NULL,NULL,NULL); demo_t(1) := Project(1,'One',1); demo_t(2) := Project(2,'Two',2); dbms_output.put_line(demo_t(2).title); -- value of varray element dbms_output.put_line(demo_t.COUNT); -- current count of elements in varray dbms_output.put_line(demo_t.LIMIT); -- max elements in varray IF demo_t.EXISTS(2) THEN dbms_output.put_line('TRUE'); END IF; END; /