在 sql 中使用 udf vs 在性能方面使用 C# 代码中的方法

Question

听说是我在 <"SQL"> 验证人员代码分配中的用户定义函数... 每人在一个时间分配卡-没有时间-sheet 节目。运行疏散服务时，计时信息发送到此功能以验证人员。功能return只有1个人员分配到此卡时有效人员。

ALTER FUNCTION [dbo].[GetPerosnnleBaseIdByCardAndTime]( @Card VARCHAR(100),@Time SMALLDATETIME)
RETURNS INT
AS
BEGIN
----------------
--DECLARE @Card VARCHAR(100) = '11000'
--DECLARE @Time SMALLDATETIME = '2019-02-01 00:00:00'--GETDATE()
---------------------------------
DECLARE @MaxDate SMALLDATETIME
DECLARE @PersonnelBaseId INT
DECLARE @Current int = 0
SELECT 
    @MaxDate = MAX(EffectiveDate) 
FROM 
    dbo.tkp_PersonnelDetails records
    inner join prs_Personnel personnel on personnel.Id = records.PersonnelBaseID AND    
                                                         Personnel.Active = 1    AND 
                                                         Personnel.Deleted = 0   AND
                                                         records.Deleted = 0    
WHERE records.Deleted = 0 AND records.EffectiveDate <= @Time AND CardNo = @Card

SELECT @PersonnelBaseId = PersonnelBaseId, @Current = [Current] FROM dbo.tkp_PersonnelDetails WHERE EffectiveDate = @MaxDate AND Deleted = 0 AND CardNo = @Card 

IF ((SELECT COUNT(*) FROM dbo.tkp_PersonnelDetails WHERE CardNo = @Card AND EffectiveDate <= @Time AND Deleted = 0) = 1)
    RETURN @PersonnelBaseId
--IF @Current = 1 
--  SELECT @PersonnelBaseId
---------
DECLARE @DETAILS TABLE (PersonnelBaseId INT,CardNo VARCHAR(100),EffectiveDate SMALLDATETIME,ROW_NO INT,PERS_NNUMBER INT)
INSERT INTO @DETAILS
SELECT 
     PD.PersonnelBaseId,CardNo,EffectiveDate        
    ,ROW_NUMBER() OVER(PARTITION BY PD.PERSONNELBASEID ORDER BY EFFECTIVEDATE) AS ROW_NO
    ,DENSE_RANK() over(ORDER BY PD.PERSONNELBASEID) AS PERS_NNUMBER 
FROM
    dbo.tkp_PersonnelDetails PD 
WHERE PersonnelBaseId in (select PersonnelBaseId from dbo.tkp_PersonnelDetails where CardNo = @Card)
ORDER BY 
    PERS_NNUMBER,ROW_NO
DECLARE @CurrectPersonnelCount int = 0
DECLARE @MaxPersNumber int = 1,@MaxRowNumber int = 1
DECLARE @PersNumber int = 1,@RowNumber int = 1
DECLARE @_PersonnelBaseId int ,@_CardNo varchar(100) ,@_EffectiveDate smalldatetime,@_CardNoNext varchar(100) ,@_EffectiveDateNext smalldatetime

SELECT @MaxPersNumber = max(PERS_NNUMBER) FROM @DETAILS
WHILE @PersNumber <= @MaxPersNumber
BEGIN
    SELECT @_PersonnelBaseId = PersonnelBaseId,@_CardNo = CardNo,@_EffectiveDate = EffectiveDate FROM @DETAILS WHERE PERS_NNUMBER = @PersNumber AND ROW_NO = @RowNumber
    SELECT @MaxRowNumber = max(ROW_NO) FROM @DETAILS WHERE PersonnelBaseId = @_PersonnelBaseId
    WHILE @RowNumber <= @MaxRowNumber
    BEGIN
        IF @_CardNo = @Card and @_EffectiveDate <= @Time
        BEGIN
            SELECT @_CardNoNext = CardNo,@_EffectiveDateNext = EffectiveDate FROM @DETAILS WHERE PERS_NNUMBER = @PersNumber AND ROW_NO = @RowNumber +1          
            IF @_EffectiveDateNext > @Time OR @_EffectiveDateNext IS NULL
            BEGIN
                SET @CurrectPersonnelCount += 1
                SET @PersonnelBaseId = @_PersonnelBaseId
            END                         
        END
        SET @RowNumber += 1
        SELECT @_PersonnelBaseId = PersonnelBaseId,@_CardNo = CardNo,@_EffectiveDate = EffectiveDate FROM @DETAILS WHERE PERS_NNUMBER = @PersNumber AND ROW_NO = @RowNumber
    END
    SET @PersNumber += 1
END
IF @CurrectPersonnelCount = 1
    RETURN @PersonnelBaseId
ELSE 
    RETURN 0

--SELECT * FROM @DETAILS

RETURN 0
END

我可以用 C# 编写这个函数，但想知道哪个是最佳实践？在 C# 方法中使用或在 <"SQL"> 中使用 "user define functions" ？对于大数据和小数据

Answer 1

你经常使用迭代函数，所以你不能在这种情况下使用内联函数，那么根据这个问题，最好用C#方法处理函数。

Answer 2

根据top Testimonies，我尝试使用内联函数。然后这个函数由 CTE:

创建

;WITH PersonnelDetailsByCarnoAndLessTime AS
(
    SELECT
        PD.*    
    FROM
        tkp_PersonnelDetails PD     
        JOIN prs_Personnel P ON P.ID = PersonnelBaseId AND P.DELETED = 0 AND P.ACTIVE = 1   
        JOIN (SELECT PersonnelBaseId,MAX(EffectiveDate) MAX_EffectiveDate
                FROM tkp_PersonnelDetails PD
                WHERE EffectiveDate <= @Time
                GROUP BY PersonnelBaseId
        ) T ON PD.PersonnelBaseId = T.PersonnelBaseId AND PD.EffectiveDate = T.MAX_EffectiveDate
    WHERE PD.Deleted = 0
), R AS
(
    SELECT 
        *
    FROM 
        PersonnelDetailsByCarnoAndLessTime PDL
    WHERE CardNo = @Card

), AssignmentCount AS
(
    SELECT
        MIN(PersonnelBaseId) PersonnelBaseId,
        COUNT((CASE WHEN EffectiveDate < @Time THEN 0 ELSE 1 END)) AssignmentCount
    FROM 
        R
)
SELECT CASE WHEN AssignmentCount = 1 THEN PersonnelBaseId ELSE 0 END PersonnelBaseId FROM AssignmentCount

在 sql 中使用 udf vs 在性能方面使用 C# 代码中的方法

use udf in sql vs method in C# code in performance

c#

sql-server

performance-testing

bigdata