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Implementación en Oracle de SQL99. Tipos de datos primitivos definidos por el usuario SQL99  CREATE DISTINCT TYPE us_dollar AS DECIMAL(9,2)  CREATE.

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Presentation on theme: "Implementación en Oracle de SQL99. Tipos de datos primitivos definidos por el usuario SQL99  CREATE DISTINCT TYPE us_dollar AS DECIMAL(9,2)  CREATE."— Presentation transcript:

1 Implementación en Oracle de SQL99

2 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));

3 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));

4 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);

5 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 voiced Where … Set recording=LOBFILE (‘/u01/app…’);

6 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)

7 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;

8 Constructores purchase_order( , person ("John Smith"," "), NULL ) INSERT INTO person_table VALUES ( "John Smith", " " ); INSERT INTO purchase_order( SELECT , VALUE(p), null FROM person_table p WHERE p.name = "John Smith“);p.name

9 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); /

10 Consultando objetos SELECT VALUE(p) FROM persons p; VALUE(P)(NAME, SSN) PERSON_T('Bob', 1234) EMPLOYEE_T('Joe', 32456, 12, ) PART_TIME_EMP_T('Tim', 5678, 13, 1000, 20)

11 Final Not Final create type Name as (firstname varchar(20), lastname varchar(20)) final create 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.

12 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.

13 Funciones de Correspondencia CREATE 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; /

14 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.

15 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);

16 Referencias más restricción de integridad referencial CREATE TABLE customer_addresses ( add_id NUMBER, address REF cust_address_typ REFERENCES address_table);

17 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;

18 Consultando Referencias SELECT address FROM customer_addresses; ADDRESS B2245DBE325C5FE B40DCB176B 2245DBE305C5FE B40DCB1 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')

19 Colecciones Set Multiset Varray

20 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

21 Nested Table/Varray Oracle create 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);

22 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


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