Как улучшить производительность рекурсивной скалярной функции sql? - PullRequest
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Как улучшить производительность рекурсивной скалярной функции sql?

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/ 08 января 2020

Я создал SQL рекурсивную скалярную функцию, которая генерирует JSON, она запускается для 1600 записей и генерирует JSON за 30 секунд. Я хочу сократить это время, как я могу это сделать? пожалуйста, код ниже. 

ALTER  FUNCTION [dbo].[function_Json_by_shumail](@POSITIONID INT, @IsRoot INT ) 
RETURNS VARCHAR(MAX)

BEGIN 
    DECLARE @Json VARCHAR(MAX) = '{}', @Name NVARCHAR(MAX), @Title NVARCHAR(MAX), @Phone NVARCHAR(MAX), @Company NVARCHAR(MAX), @Email NVARCHAR(MAX) , @Children    NVARCHAR(MAX)

    SET @Json =  
    (SELECT P.Name as name , ISNULL(P.POSTIONTITTLE,'') as title, ISNULL(P.primarycontactemail,'') as email , ISNULL(P.PRIMARYCONTACTPHONE,'') as phone , ISNULL(P.[COMPANY NAME],'') as company ,JSON_QUERY(dbo.function_Json_by_shumail(P.POSITIONID, 2) ) AS children 
    FROM [dbo].[VW_WorkerHierarchyUpdated] AS P  
    WHERE P.PARENTPOSITIONID = @POSITIONID
    FOR JSON AUTO);

    IF(@IsRoot = 0) 
    BEGIN
       SELECT @Name = P.Name FROM [dbo].[VW_WorkerHierarchyUpdated] AS P WHERE P.PARENTPOSITIONID is Null
       SELECT @Title = ISNULL(P.POSTIONTITTLE,'') FROM [dbo].[VW_WorkerHierarchyUpdated] AS P WHERE P.PARENTPOSITIONID is Null
       SELECT @Phone = ISNULL(P.PRIMARYCONTACTPHONE,'') FROM [dbo].[VW_WorkerHierarchyUpdated] AS P WHERE P.PARENTPOSITIONID is Null
       SELECT @Company = ISNULL(P.[COMPANY NAME],'') FROM [dbo].[VW_WorkerHierarchyUpdated] AS P WHERE P.PARENTPOSITIONID is Null
       SELECT @Email = ISNULL(P.primarycontactemail,'') FROM [dbo].[VW_WorkerHierarchyUpdated] AS P WHERE P.PARENTPOSITIONID is Null
       SET @Json =   '{"name":"' + @Name + '","title":"' + @Title + '","email":"' + @Email + '","phone":"' + @Phone + '","company":"' + @Company + '","children":' + CAST(@Json AS VARCHAR(MAX)) + '}'
       SET @IsRoot = 1
    END
    IF(@IsRoot = @POSITIONID) 
    BEGIN
       SELECT @Name = P.Name FROM [dbo].[VW_WorkerHierarchyUpdated] AS P WHERE P.POSITIONID = @POSITIONID
       SELECT @Title = ISNULL(P.POSTIONTITTLE,'') FROM [dbo].[VW_WorkerHierarchyUpdated] AS P WHERE P.POSITIONID = @POSITIONID
       SELECT @Phone = ISNULL(P.PRIMARYCONTACTPHONE,'') FROM [dbo].[VW_WorkerHierarchyUpdated] AS P WHERE P.POSITIONID = @POSITIONID
       SELECT @Company = ISNULL(P.[COMPANY NAME],'') FROM [dbo].[VW_WorkerHierarchyUpdated] AS P WHERE P.POSITIONID = @POSITIONID
       SELECT @Email = ISNULL(P.primarycontactemail,'') FROM [dbo].[VW_WorkerHierarchyUpdated] AS P WHERE P.POSITIONID = @POSITIONID
       SET @Json =   '{"name":"' + @Name + '","title":"' + @Title + '","email":"' + @Email + '","phone":"' + @Phone + '","company":"' + @Company + '","children":' + CAST(@Json AS VARCHAR(MAX)) + '}'
       SET @IsRoot = 1
    END


    RETURN @Json 

END
...