Question

我有一个包含接受数组的构造函数的类型。我想构建一个这种类型的数组并同时输入子数组。

作为一个例子

create type child as object
(
    name varchar2(10)
);
/
create type children as table of child;
/
create type parent as object
(
    name varchar2(10),
    my_children children
);
/
create type parents as table of parent;
/
create table child_table
(
    parent_name varchar2(10),
    child_name varchar2(10)
);
/
create table parent_table 
(
    name varchar2(10)
);
/
declare
    l_parents parents;
begin
    select parent(p.name, (select child(c.child_name) from child_table where parent_name = p.name))
    bulk collect into l_parents
    from parent_table p;
end;

第四行到最后一行（select parent（p.name ....））只是伪代码，是我遇到问题的那一行。

Answer 1

尝试这样的事情：

SELECT parent(p.name,
              CAST((SELECT COLLECT (child(c.child_name))
                      FROM child_table c
                     WHERE parent_name = p.name
                   ) AS children
                  )
             )
  BULK COLLECT INTO  l_parents
  FROM parent_table p;

Answer 2

declare
    l_parents parents;
begin
    select parent(p.name,  cast(multiset(select c.child_name from child_table c where parent_name = p.name)as children))
    bulk collect into l_parents
    from parent_table p;
end;

使用包含嵌套表的类型构造

2 个答案: