C# 一组与UniqueID相关的字符串操作，但该特定列实际上不是查询所必需的。您应该只选择列，然后在应用程序级别创建聚合UniqueID；排除那些强制转换和使用的字符串concats.Tag dbms。（特定于产品的问题…）您正在执行许多与UniqueID相关

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一组与UniqueID相关的字符串操作，但该特定列实际上不是查询所必需的。您应该只选择列，然后在应用程序级别创建聚合UniqueID；排除那些强制转换和使用的字符串concats.Tag dbms。（特定于产品的问题…）您正在执行许多与UniqueID相关的字符串操作，但该特定列实际上并不是查询所必需的。您应该只选择列，然后在应用程序级别创建聚合UniqueID；把那些石膏和细绳连在一起算出来。那可能行得通，谢谢。正在创建产品树，将报告结果：）这可能会起作用，谢谢。正在创建产品树，将报告结果：）

WHERE ProductID = @ProductID

  ALTER PROCEDURE [dbo].[ProductProduct_selectHierarchy_v2]
WITH EXECUTE AS CALLER
AS
BEGIN
WITH ProductProductHierarchy (
    ProductID
    ,ItemProductID
    ,LEVEL
    ,UniqueID
    ,ParentID
    ,RowType
    ,ProductDetailID
    ,ProductProductDetailBindID
    ,ManufactoryOperationID
    ,ItemID
    )
AS (
    -- Anchor member definition
    SELECT dbo.Product.ProductID AS ProductID
        ,Product.ProductID AS ItemProductID
        ,0 AS LEVEL
        ,Cast(cast(Product.ProductID AS NVARCHAR(40)) + '' AS NVARCHAR(50)) AS UniqueID
        ,cast('' AS NVARCHAR(50)) AS ParentID
        ,1 AS RowType
        ,NULL AS ProductDetailID
        ,NULL AS ProductProductDetailBindID
        ,NULL AS ManufactoryOperationID
        ,NULL AS ItemID
    FROM dbo.Product

    UNION ALL

    -- Recursive member definition
    SELECT e.ProductID
        ,e.ItemProductID
        ,LEVEL + 1
        ,Cast(Cast(d.UniqueID AS NVARCHAR(40)) + '_' + cast((e.ItemProductID) AS NVARCHAR(10)) AS NVARCHAR(50)) AS UniqueID
        ,Cast(d.UniqueID AS NVARCHAR(50)) AS ParentID
        ,1 AS RowType
        ,NULL AS ProductDetailID
        ,NULL AS ProductProductDetailBindID
        ,NULL AS ManufactoryOperationID
        ,NULL AS ItemID
    FROM dbo.ProductProduct AS e
    INNER JOIN ProductProductHierarchy AS d ON e.ProductID = d.ItemProductID

    UNION ALL

    SELECT NULL AS ProductID
        ,NULL
        ,LEVEL + 1
        ,Cast(Cast(d.UniqueID AS NVARCHAR(40)) + '_' + cast((e.ProductDetailID) AS NVARCHAR(10)) AS NVARCHAR(50)) AS UniqueID
        ,Cast(d.UniqueID AS NVARCHAR(50)) AS ParentID
        ,2 AS RowType
        ,e.ProductDetailID AS ProductDetailID
        ,e.ProductProductDetailBindID AS ProductProductDetailBindID
        ,NULL AS ManufactoryOperationID
        ,NULL AS ItemID
    FROM dbo.ProductProductDetailBind AS e
    INNER JOIN ProductProductHierarchy AS d ON e.ProductID = d.ItemProductID

    UNION ALL

    SELECT NULL AS ProductID
        ,NULL
        ,LEVEL + 1
        ,Cast(Cast(d.UniqueID AS NVARCHAR(40)) + '_' + cast((e.ManufactoryOperationID) AS NVARCHAR(10)) AS NVARCHAR(50)) AS UniqueID
        ,Cast(d.UniqueID AS NVARCHAR(50)) AS ParentID
        ,3 AS RowType
        ,NULL AS ProductDetailID
        ,NULL AS ProductProductDetailBindID
        ,e.ManufactoryOperationID AS ManufactoryOperationID
        ,NULL AS ItemID
    FROM dbo.ProductDetailOperation AS e
    INNER JOIN ProductProductHierarchy AS d ON e.ProductProductDetailBindID = d.ProductProductDetailBindID

    UNION ALL

    SELECT NULL AS ProductID
        ,NULL
        ,LEVEL + 1
        ,Cast(Cast(d.UniqueID AS NVARCHAR(40)) + '_' + cast((e.ItemID) AS NVARCHAR(10)) AS NVARCHAR(50)) AS UniqueID
        ,Cast(d.UniqueID AS NVARCHAR(50)) AS ParentID
        ,4 AS RowType
        ,NULL AS ProductDetailID
        ,NULL AS ProductProductDetailBindID
        ,NULL AS ManufactoryOperationID
        ,e.ItemID AS ItemID
    FROM dbo.ProductItem AS e
    INNER JOIN ProductProductHierarchy AS d ON e.ProductID = d.ItemProductID
    )
-- Statement that executes the CTE
SELECT CASE 
        WHEN RowType = 1
            THEN ProductName + '<' + ProductCode + '>'
        WHEN RowType = 2
            THEN ProductDetail.ProductDetailName
        WHEN RowType = 3
            THEN ManufactoryOperation.ManufactoryOperationName
        ELSE Item.ItemName
        END AS ProductName
    ,UniqueID
    ,ProductProductHierarchy.ParentID
    ,Product.ProductID
    ,RowType
FROM ProductProductHierarchy
LEFT OUTER JOIN Product ON Product.ProductID = ProductProductHierarchy.ItemProductID
    AND RowType = 1
LEFT OUTER JOIN ProductDetail ON ProductDetail.ProductDetailID = ProductProductHierarchy.ProductDetailID
    AND RowType = 2
LEFT OUTER JOIN ManufactoryOperation ON ManufactoryOperation.ManufactoryOperationID = ProductProductHierarchy.ManufactoryOperationID
    AND RowType = 3
LEFT OUTER JOIN Item ON Item.ItemID = ProductProductHierarchy.ItemID
    AND RowType = 4
OPTION (MAXRECURSION 0)