Question

我有一张桌子

create table abac_object (
    inbound abac_attribute,
    outbound abac_attribute,
    created_at timestamptz not null default now(),

    primary key (inbound, outbound)
);

abac_attribute是我的自定义类型，定义如下

create type abac_attribute as (
    value text,
    key text,
    namespace_id uuid
);

我尝试创建许多可在表格上使用的功能

create function abac_object_list_1(_attr abac_attribute)
returns setof abac_object as $$
    select *
    from abac_object
    where outbound = _attr
$$ language sql stable;

create function abac_object_list_2(_attr1 abac_attribute, _attr2 abac_attribute)
returns setof abac_object as $$
    select t1.*
    from abac_object as t1
    inner join abac_object as t2 on t1.inbound = t2.inbound
    where
        t1.outbound = _attr1
        and t2.outbound = _attr2
$$ language sql stable;

create function abac_object_list_3(_attr1 abac_attribute, _attr2 abac_attribute, _attr3 abac_attribute)
returns setof abac_object as $$
    select t1.*
    from abac_object as t1
    inner join abac_object as t2 on t1.inbound = t2.inbound
    inner join abac_object as t3 on t1.inbound = t3.inbound
    where
        t1.outbound = _attr1
        and t2.outbound = _attr2
        and t3.outbound = _attr3
$$ language sql stable;

create function abac_object_list(_attrs abac_attribute[], _offset integer, _limit integer)
returns setof abac_attribute as $$
begin
    case array_length(_attrs, 1)
        when 1 then return query
            select t.inbound
            from abac_object_list_1(_attrs[1]) as t
            order by t.created_at
            offset _offset
            limit _limit;
        when 2 then return query
            select t.inbound
            from abac_object_list_2(_attrs[1], _attrs[2]) as t
            order by t.created_at
            offset _offset
            limit _limit;
        when 3 then return query
            select t.inbound
            from abac_object_list_3(_attrs[1], _attrs[2], _attrs[3]) as t
            order by t.created_at
            offset _offset
            limit _limit;
        else raise exception 'bad argument' using detail = 'array length should be less or equal to 3';
    end case;
end
$$ language plpgsql stable;

abac_object_list_1工作正常

select *
from abac_object_list_1(('apple', 'type', '00000000-0000-1000-a000-000000000010') ::abac_attribute);

但是，abac_object_list出现以下错误

select *
from abac_object_list(array [('apple', 'type', '00000000-0000-1000-a000-000000000010')] :: abac_attribute[], 0, 100);

[42804]错误：查询的结构与函数结果类型不匹配详细信息：返回的类型abac_attribute与列1中的预期类型文本不匹配。其中：PL / pgSQL函数abac_object_list（abac_attribute []，integer，integer）第4行在RETURN QUERY上

我无法理解text类型的来源。

这些功能以前曾起作用，但随后我添加了created_at列以能够添加显式的ORDER BY子句。现在我无法正确重写函数。

也许还有更好的（或更惯用的）方式定义这些功能。

您能帮我弄清楚吗？谢谢。

P。

好吧，如果我写

return query select (t.inbound).*

但是我不确定这是否是正确的方法。我也想知道使用return table或return setof会更好。

PL / pgSQL：查询结构与函数结果类型不匹配

0 个答案: