查询在自定义函数中没有结果数据的目的地

Question

我是 postgres 的新手，我正在尝试用 select 语句的结果填充一些 table。但是我得到这个错误：

[42601] ERROR: query has no destination for result data
Hint: If you want to discard the results of a SELECT, use PERFORM instead.
Where: PL/pgSQL function get_child_folder_mask(integer) line 12 at SQL statement

这是我使用的查询：

insert into public."security_report_data" ("ReportID", "SDID", "PermissionType", "Mask")
    select val_ReportID, tMain."SDID", t1."PermissionType", public."get_child_folder_mask"(t1."Mask") <----
    from    public."table_{00000000-eeea-4e2e-a04c-d4351282fb55}" tMain
            inner join public."table_{00000000-eeea-4e2e-a04c-d4351282fb55}" tParent
                on tMain."ParentTreeRowID" = tParent."RowID"
            inner join public."report_aces" t1
                on tParent."SDID" = t1."SDID"
            inner join public."report_accounts" t2
                on t1."Account" = t2."Account"
                and (t2."Member" = val_Account or public."fn_is_everyone"(t2."Member") = true);

get_child_folder_mask的代码：

create function get_child_folder_mask(val_parentfoldermask integer DEFAULT NULL::integer) returns integer
    language plpgsql
as
$$
declare val_Mask integer = 0;
begin   

    if ((val_ParentFolderMask & x'00000004'::integer) = x'00000004'::integer) then
        select val_Mask = val_Mask | x'00000002'::integer;
    end if;

    if ((val_ParentFolderMask & x'00000008'::integer) = x'00000008'::integer) then
        select val_Mask = val_Mask | x'00010000'::integer;
    end if;

    return val_Mask;
end;
$$;

我发现如果将 get_child_folder_mask 的参数从 t1."Mask" 更改为某个常量整数值，错误就会消失。我很乐意提供任何帮助。谢谢！

Answer 1

您不需要 SELECT 到 assign PL/pgSQL 中的变量值：

if ((val_ParentFolderMask & x'00000004'::integer) = x'00000004'::integer) then
    val_Mask := val_Mask | x'00000002'::integer;
end if;

if ((val_ParentFolderMask & x'00000008'::integer) = x'00000008'::integer) then
    val_Mask := val_Mask | x'00010000'::integer;
end if;

查询在自定义函数中没有结果数据的目的地

Query has no destination for result data in custom function

postgresql

plpgsql