在PL/SQL中使用集合

1.PL/SQL集合方法

创建和使用多级集合

1.使用多级集合

create type t_varray_phone as varray(3) of varchar2(14);

create type t_address as object (
    street varchar2(15),
    city varchar2(15),
    state char(2),
    zip varchar2(5),
    phone_number t_varray_address
);

create type t_nested_table_address as table of t_address;

create table customer_with_nested_tabel (
    id integer primary key,
    first_name varchar(10),
    last_name varchar(10),
    addresses t_nested_table_address
)
nested table
    addresses
store as
    nested_addresses;

Oracle Database 10g对集合的增强

1.关联数据

create procedure customers_associative_array as
    type t_assoc_array is table of number index by varchar2(15);
    v_customer_array t_assoc_array;
begin
    v_customer_array('jason') := 32,
    v_customer_array('zoey') := 28;

    dbms_output.put_line(v_customer_array('jason'));
    dbms_output.put_line(v_customer_array('zoey'));
end customers_associative_array;

2.更改元素类型的大小

alter type t_varray_address
modify element type varchar2(60) cascade;

3.增加变长数组中元素的个数

alter type t_varray_address
modify limit 5 cascade;

4.为嵌套表的存储表使用不同的表空间

create table cust_with_nested_tabel (
    id integer primary key,
    first_name varchar(10),
    last_name varchar(10),
    addresses t_nested_table_address
)
nested table
    addresses
store as
    nested_addresses tablespace users;

5.嵌套表对ANSI的支持

函数：