Question

尝试创建一个表函数，该函数将返回一个两列表，该表必须以if语句为条件。

我还有另外两个功能可以分开执行此操作，但是合并后无法正常工作。

create  function dbo.PDM_GetCategorytable (@Mystring varchar(200) ,@appid int)
returns table
as -- begin

--return
begin
-- declare @MyString varchar(200);
--set @MyString= 'Fred mtf is dead'--'RE: [Encrypt]]FW: MTF Military --- 
--UPDATE URGENT'
--declare @AppId int =5

declare @Dubb Table (Col varchar(200));
insert into @dubb 
(Col )
values ( @Mystring);

if ((select top 1 categoryid from @dubb a
left join 
(SELECT        (pass.Recordid) as categoryid , pass.appid, 
pass.Priority_Identifier, pass.PrioritySortorder, pass.Category, 
ps.Search_String AS SrchVar
FROM            dbo.PDM_PriorityAssignments AS pass INNER JOIN
                     dbo.PDM_Priority_Search AS ps ON pass.Recordid = 
ps.PriorityAssignmentid where pass.appid=@AppId )  b on a.col like '%' + 
b.SrchVar + '%'
                     order by PrioritySortorder)  is not null)--'where 
appid=@AppId
begin
select top 1 categoryid,Category from @dubb a
left join 
(SELECT        (pass.Recordid) as categoryid , pass.appid, 
pass.Priority_Identifier, pass.PrioritySortorder, pass.Category, 
ps.Search_String AS SrchVar
FROM            dbo.PDM_PriorityAssignments AS pass INNER JOIN
                         dbo.PDM_Priority_Search AS ps ON pass.Recordid = 
ps.PriorityAssignmentid where pass.appid=@AppId )  b on a.col like '%' + 
b.SrchVar + '%'
                         order by PrioritySortorder;
                    end
else
begin
select recordid as categoryid,Category  FROM dbo.PDM_PriorityAssignments 
AS pass  where appid=@AppId and Priority_Identifier like 'Routine'
end
return
end;

预期结果将返回两列，类别ID和类别。

Answer 1

看起来像是多语句表值函数的重复项 Multi-statement Table Valued Function vs Inline Table Valued Function

这是一个实现此目标的示例。

CREATE FUNCTION foo
    (@param int)
RETURNS 
    @T TABLE (id int, val varchar)
As
BEGIN


    IF (@param = 1)
        insert into @t Select 1, 'a';
    else
        insert into @t Select 0, 'a';

    return ;

END
GO

Answer 2

问题恰恰是因为您需要使用算法。该要求可防止您仅返回表。在这种情况下，您需要做一些不同的事情。首先定义结果表，然后根据需要插入值。
没有您的数据，我将无法运行它，但是它应该可以工作。

CREATE FUNCTION dbo.PDM_GetCategorytable (
    @Mystring VARCHAR(200)
    ,@appid INT
    )
RETURNS @GetCategorytable TABLE
(
    [CategoryId] INT,
    [Category] VARCHAR(200))
AS -- begin
--return
BEGIN
    -- declare @MyString varchar(200);
    --set @MyString= 'Fred mtf is dead'--'RE: [Encrypt]]FW: MTF Military --- 
    --UPDATE URGENT'
    --declare @AppId int =5
    DECLARE @Dubb TABLE (Col VARCHAR(200));

    INSERT INTO @dubb (Col)
    VALUES (@Mystring);

    IF (
            (
                SELECT TOP 1 categoryid
                FROM @dubb a
                LEFT JOIN (
                    SELECT (pass.Recordid) AS categoryid
                        ,pass.appid
                        ,pass.Priority_Identifier
                        ,pass.PrioritySortorder
                        ,pass.Category
                        ,ps.Search_String AS SrchVar
                    FROM dbo.PDM_PriorityAssignments AS pass
                    INNER JOIN dbo.PDM_Priority_Search AS ps ON pass.Recordid = ps.PriorityAssignmentid
                    WHERE pass.appid = @AppId
                    ) b ON a.col LIKE '%' + b.SrchVar + '%'
                ORDER BY PrioritySortorder
                ) IS NOT NULL
            ) --'where 
        -- NOT SURE WHAT YOU ARE TRYING TO DO WITH THIS -- appid = @AppId
    BEGIN
        insert into @GetCategorytable(Categoryid, Category)
        SELECT TOP 1 categoryid
            ,Category
        FROM @dubb a
        LEFT JOIN (
            SELECT (pass.Recordid) AS categoryid
                ,pass.appid
                ,pass.Priority_Identifier
                ,pass.PrioritySortorder
                ,pass.Category
                ,ps.Search_String AS SrchVar
            FROM dbo.PDM_PriorityAssignments AS pass
            INNER JOIN dbo.PDM_Priority_Search AS ps ON pass.Recordid = ps.PriorityAssignmentid
            WHERE pass.appid = @AppId
            ) b ON a.col LIKE '%' + b.SrchVar + '%'
        ORDER BY PrioritySortorder;
    END
    ELSE
    BEGIN
        insert into @GetCategorytable(Categoryid, Category)
        SELECT recordid AS categoryid ,Category FROM dbo.PDM_PriorityAssignments AS pass
        WHERE appid = @AppId
            AND Priority_Identifier LIKE 'Routine'
    END

RETURN
END;

无法使表函数与if语句一起使用

2 个答案: