Implementación en Oracle de SQL99

Tipos de datos primitivos definidos por el usuario SQL99

CREATE DISTINCT TYPE us_dollar AS DECIMAL(9,2)

CREATE DISTINCT TYPE canadian_dollar AS DECIMAL(9,2)

Oracle CREATE or REPLACE TYPE us_dollar as object(price NUMBER(9,2));

CREATE or REPLACE TYPE canadian_dollar as object(price NUMBER(9,2));

Large Objects LOB tiene dos subtipos

Binary Large Object, BLOB, almacena objetos multimedia: audio, imagen, mapas, video, fotos.

Character Large Object, CLOB, almacena texto LOB locator, aputandor a un LOB.

CREATE TABLE documental (titulo VARCHAR2(200),id_doc INTEGER,resumen CLOB (32K),texto_doc CLOB (20M),video_film BLOB (2K));

Oracle Large Objects

No se especifican límites para los Large Objects.

CREATE TABLE documental (titulo VARCHAR2(200),id_doc INTEGER,resumen CLOB,texto_doc CLOB,video_film BLOB);

Oracle Large Objets Lob locator/Bfile

CREATE TYPE Voiced_typ AS OBJECT ( Originator VARCHAR2(30), Script CLOB, Actor VARCHAR2(30), Take NUMBER, Recording BFILE ); Create table voiced of voiced_typ;Update voicedWhere …Set recording=LOBFILE (‘/u01/app…’);

TADS y sus Operaciones

create or replace type DataStream as object (

id integer, name varchar2(20), createdOn date, data clob, MEMBER FUNCTION DataStreamMin return pls_integer, MEMBER FUNCTION DataStreamMax return pls_integer)

TADS y sus Operaciones

CREATE OR REPLACE TYPE BODY DataStream IS MEMBER FUNCTION DataStreamMin return pls_integer

is a pls_integer := DS_Package.ds_findmin(data); begin return a; end; MEMBER FUNCTION DataStreamMax return pls_integer

is b pls_integer := DS_Package.ds_findmax(data);

begin return b; end; end;

Constructores purchase_order(

1000376,person ("John Smith","1-800-555-1212"),NULL )

INSERT INTO person_table VALUES ("John Smith","1-800-555-1212" );

INSERT INTO purchase_order( SELECT 1000376, VALUE(p), null FROM

person_table pWHERE p.name = "John Smith“);

Subtipos y Herencia

CREATE TYPE person_t AS OBJECT (name VARCHAR2(100), ssn NUMBER) NOT FINAL; /

CREATE TYPE employee_t UNDER person_t (department_id NUMBER, salary NUMBER) NOT FINAL; /

CREATE TYPE part_time_emp_t UNDER employee_t (num_hrs NUMBER); /

Consultando objetos

SELECT VALUE(p) FROM persons p;

VALUE(P)(NAME, SSN) ----------------------------------------

PERSON_T('Bob', 1234) EMPLOYEE_T('Joe', 32456, 12, 100000) PART_TIME_EMP_T('Tim', 5678, 13, 1000, 20)

Final Not Final

create type Name as (firstname varchar(20), lastname varchar(20))

finalcreate type Address as (street varchar(20), city varchar(20), zipcode varchar(20))

not final Nota: final y not final indican cuando se pueden

crear subtipos.

Funciones de Correspondencias Los Map methods producen un valor simple de un

tipo definido por el usuario que puede ser compuesto, para ser usado en funciones de comparación y ordenamientos.

Por ejemplo, si se define un objeto del tipo RECTANGLE, el método de correspondencia AREA puede multiplicar sus atributos HEIGHT y WIDTH y retornar una respuesta.

Oracle puede comparar dos rectángulos por medio de la comparación de sus áreas.

Funciones de CorrespondenciaCREATE TYPE rectangle_typ AS OBJECT ( len NUMBER,

wid NUMBER, MAP MEMBER FUNCTION area RETURN NUMBER); /

CREATE TYPE BODY rectangle_typ AS MAP MEMBER FUNCTION area RETURN NUMBER IS BEGIN RETURN len * wid; END area; END; /

Column type o Row Type?

SQL> CREATE TYPE person_t AS OBJECT (name VARCHAR2(100),

ssn NUMBER) NOT FINAL;/Type created.SQL> create table prueba(p person_t);Table created.SQL> create table prueba2 of person_t;Table created.

Referencias

CREATE TYPE cust_address_typ_new AS OBJECT ( street_address VARCHAR2(40) ,

postal_code VARCHAR2(10) , city VARCHAR2(30) , state_province VARCHAR2(10) , country_id CHAR(2) ); /CREATE TABLE address_table OF

cust_address_typ_new;

CREATE TABLE customer_addresses ( add_id NUMBER, address REF cust_address_typ_new SCOPE IS address_table);

Referencias más restricción de integridad referencialCREATE TABLE customer_addresses ( add_id NUMBER,

address REF cust_address_typ REFERENCES address_table);

Insertando referencias

INSERT INTO address_table VALUES ('1 First', 'G45 EU8', 'Paris', 'CA', 'US');

INSERT INTO customer_addresses SELECT 999, REF(a) FROM address_table a;

Consultando Referencias

SELECT address FROM customer_addresses; ADDRESS----------------------------------------------

000022020876B2245DBE325C5FE03400400B40DCB176B2245DBE305C5FE03400400B40DCB1

SELECT DEREF(address) FROM customer_addresses; DEREF(ADDRESS)(STREET_ADDRESS, POSTAL_CODE,

CITY, STATE_PROVINCE, COUNTRY_ID) ----------------------------------------------- CUST_ADDRESS_TYP('1 First', 'G45 EU8',

'Paris','CA', 'US')

Colecciones

Set Multiset Varray

Multiset/Array SQL99

create type Publisher as ( name varchar(20),branch varchar(20)

create type Book as( title varchar(20),author-array varchar(20) array [10],

pub-date date,publisher Publisher,

keyword-set varchar(20) multiset )create table books of Book

Nested Table/Varray Oraclecreate type publisher_t as object( name varchar(20), branch varchar(20));CREATE TYPE keyword_t AS TABLE OF varchar(20);

CREATE TYPE authorarray_t as varray (10) of varchar(20);

create type Book as object( title varchar(20), authorarray authorarray_t, pubdate date, publisher publisher_t, keywordset keyword_t);

Colecciones de Múltiples niveles Multilevel collection types are collection types

whose elements are themselves directly or indirectly another collection type. Possible multilevel collection types are: Nested table of nested table type Nested table of varray type Varray of nested table type Varray of varray type Nested table or varray of a user-defined type that

has an attribute that is a nested table or varray type