7.1 Theoretical Background
Here are some examples of Oracle 9i types DDL statement, which are mapped from object-relational data model.
7.1.1 Object type as column type
Type NAME_OBJTYP
firstName midName
lastName VARCHAR215
VARCHAR215 VARCHAR215
CREATE TYPE name_objtyp AS OBJECT firstName VARCHAR215,
midName VARCHAR215, lastName VARCHAR215;
Type ADDRESS_OBJTYP
street City
state poscode
VARCHAR215 VARCHAR210
VARCHAR210 NUMBER
CREATE TYPE address_objtyp AS OBJECT street VARCHAR215,
city VARCHAR210, state VARCHAR210,
poscode number;
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7.1.2 Object type as row type Type CUSTOMER_OBJTYP
custNo custName
CustAdd ress
VARCHAR215 Name_objtyp
Address _objtyp
CREATE TYPE customer_objtyp AS OBJECT CustNo VARCHAR215,
CustName name_objtyp, CustAddress address_objtyp;
CREATE TABLE customer_tab of customer_objtyp CustNo PRIMARY KEY OBJECT IDENTIFIER PRIMARY KEY;
7.1.3 Collection types - Array type
Type PHONELIST_VARTYP PhoneNum
Maximum 5 values VARCHAR215
CREATE TYPE phonelist_vartyp AS VARRAY 5 OF VARCHAR220;
Modification needs to be made for CUSTOMER_OBJTYP to include the new array type.
Type CUSTOMER_OBJTYP custNo
custName CustAddress
custContact VARCHAR215 Name_objtyp Address_objtyp Phonelist_vartyp
CREATE TYPE customer_objtyp AS OBJECT CustNo VARCHAR215,
CustName name_objtyp, CustAddress address_objtyp,
CustContact Phonelist_vartyp;
CREATE TABLE customer_tab of customer_objtyp CustNo PRIMARY KEY OBJECT IDENTIFIER PRIMARY KEY;
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Inserting values into customer_tab
Example :
INSERT INTO customer_tab VALUES‘C001’, name_objtyp‘Mohd’,’Azmi’,’Ali’,
address_objtyp‘Jln Merbau’,’Ayer Keroh’,’Melaka’,75450, Phonelist_vartyp‘012-8792345’,’06-5645345’;
7.1.4 Collection types – Nested table
Type DEPENDANT_OBJTYP DependantId PK
dependantName dependantAddress
String Object Type
Object Type VARCHAR210
NAME_OBJTYP ADDRESS_OBJTYP
CREATE TYPE dependant_objtyp AS OBJECT dependantId VARCHAR210,
dependantName name_objtyp, dependantAddress address_objtyp;
Column dependantList of DEPENDANT_NESTEDTAB as table of DEPENDANT_OBJTYP
dependantId dependantName
dependantAddress VARCHAR210
NAME_OBJTYP ADDRESS_OBJTYP
CREATE TYPE dependant_nestedtab AS TABLE OF dependant_objtyp;
Type EMPLOYEE_OBJTYP
EmployeeId PK startDate
dependantList String
Date Nested Table
VARCHAR210 DATE
DEPENDANT_NESTEDTAB
CREATE TYPE employee_objtyp AS OBJECT EmployeeId VARCHAR210,
StartDate DATE, DependantList DEPENDANT_NESTEDTAB;
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Then, create object table based on object type created for employee.
CREATE TABLE employee_tab of employee_objtyp EmployeeId PRIMARY KEY
OBJECT IDENTIFIER PRIMARY KEY NESTED TABLE DependantList STORE AS DependantListStorageTable
PRIMARY KEY NESTED_TABLE_ID,dependantId ;
OR
CREATE TABLE employee_tab of employee_objtyp PRIMARY KEY EmployeeId
OBJECT IDENTIFIER is PRIMARY KEY NESTED TABLE DependantList STORE AS DependantListStorageTable
PRIMARY KEY NESTED_TABLE_ID, dependantId ;
Inserting values into employee_tab
INSERT INTO employee_tab VALUES E001,SYSDATE,DEPENDANT_NESTEDTAB;
The values for nested table in the DependantList column need to be inserted.
INSERT INTO TABLE SELECT e.dependantList
FROM employee_tab e WHERE e.employeeId = ’E001’
VALUES ‘D101’, name_objtyp‘Nur’,’Ainun’,’Anas’,
address_objtyp‘Jln 120’,’Jasin’,’Melaka’,75450;
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7.1.5 REF type
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