oracle 集合的类型

集合的类型有三种：关联数组，varry，嵌套表

关联数组

只在PL/SQL中有效，无需初始化

----------下标可以使用pls_integer

declare

type a is table of varchar2(10) index by pls_integer;

l_row pls_integer;

name a;

begin

name(1):='jim';

name(2):='Wolf';

name(3):='Candy';

l_row:=name.first;

loop

exit when l_row is null;

dbms_output.put_line(name(l_row));

l_row:=name.next(l_row);

end loop;

end;

/

----------下标可以使用varchar2

declare

type a is table of varchar2(10) index by varchar2(10);

l_row pls_integer;

age a;

begin

age('Jim'):=22;

age('Wolf'):=32;

dbms_output.put_line(age('Jim'));

end;

/

嵌套表

可作为模式级别数据类型，运用于SQL

--------------------用法一

declare

type a is table of varchar2(10);

name a:=a();

begin

name.extend(3);

name(1):='Jim';

name(2):='Bonie';

name(3):='Elena';

dbms_output.put_line(name(1));

end;

/

--------------------用法二  将嵌套表的字段类型以SQL表的形式输出

create type a is table of varchar2(10);

drop table test;

create table test(

family varchar2(10)

,name a

)

nested table name store as name_1

;

declare

name a:=a();

begin

name.extend(3);

name(1):='Jim';

name(2):='Bonie';

name(3):='Elena';

insert into test(family,name) values('f_wang',name);

end;

/

select * from table(select name from test);

----------------用法三  将嵌套表类型转换SQL表形式的数据

declare

name a:=a();

name_1 varchar2(20);

cur_1 sys_refcursor;

begin

name.extend(3);

name(1):='Jim';

name(2):='Bonie';

name(3):='Elena';

open cur_1 for select * from table(name);

loop

fetch cur_1 into name_1;

exit when cur_1%notfound;

dbms_output.put_line(name_1);

end loop;

end;

/