sql - 在 sql 中条件更新/插入

Question

我有一个用于更新/插入从 XML 读取的数据的存储过程。现在，正如您在 itemResults 下的 xml 数据中看到的那样，有多个（在本例中为 2 个）项目。我希望只更新值更改的项目。在我的存储过程中，默认情况下它采用第一项的值。项目值显然会在运行时改变。同样无论没有。用户添加的项目（如果添加新项目），它们应该保存到数据库中。

XML 数据：

<?xml version="1.0" encoding="utf-16"?>
<SaveOrder xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<OrderID>10511</OrderID>
<RowID>0</RowID>
<EmployeeID>0</EmployeeID>
<OrderDate>4/18/1997</OrderDate>
<ShipVia>0</ShipVia>
<Freight>0</Freight>
<ContactName>Laurence Lebihan</ContactName>
<Phone>91.24.45.40</Phone>
<ItemCount>0</ItemCount>

<orderResults>
<Orders>
<OrderID>10511</OrderID>
<RowID>68</RowID>
<CustomerID>BONAP</CustomerID>
<EmployeeID>4</EmployeeID>
<OrderDate>4/18/1997</OrderDate>
<RequiredDate>5/16/1997</RequiredDate>
<ShippedDate>5/16/1997</ShippedDate>
<ShipVia>3</ShipVia>
<Freight>420</Freight>
<ShipName>Bon app'</ShipName>
<ShipAddress>12, rue des Bouchers</ShipAddress>
<ShipCity>Marseille</ShipCity>
<ShipRegion />
<ShipPostalCode>13008</ShipPostalCode>
<ShipCountry>France</ShipCountry>
<CompanyName>Bon app'</CompanyName>
<ContactName>Laurence Lebihan</ContactName>
<Phone>91.24.45.40</Phone>
<ItemCount>3</ItemCount>

<itemResults>
<Items>
<OrderID>10511</OrderID>
<ProductID>4</ProductID>
<UnitPrice>22.0000</UnitPrice>
<Quantity>50</Quantity>
<Discount>0.15</Discount>
</Items>
<Items>
<OrderID>10511</OrderID>
<ProductID>7</ProductID>
<UnitPrice>30.0000</UnitPrice>
<Quantity>50</Quantity>
<Discount>0.15</Discount>
</Items>
<Items>
<OrderID>10511</OrderID>
<ProductID>8</ProductID>
<UnitPrice>40.0000</UnitPrice>
<Quantity>10</Quantity>
<Discount>0.15</Discount>

</Items>
</itemResults>
</Orders>
</orderResults>
</SaveOrder>

存储过程：ALTER PROCEDURE [dbo].[usp_UpdateOrderDetail]

   @Request XML = '<Request/>'--, 
--@Response XML = '<Response/>' OUTPUT

   As

   BEGIN
DECLARE @OrderID int
DECLARE @ProductID nvarchar(50)

SET @OrderID = @Request.value('(SaveOrder/OrderID)[1]', 'int') 
IF @OrderID > 0 
    BEGIN
        UPDATE  Customers SET 
                ContactName = T.C.value('(ContactName/text())[1]', 'nvarchar(30)'),
                Phone = T.C.value('(Phone/text())[1]', 'nvarchar(24)')
                --OrderDate = T.C.value('OrderDate[1]', 'varchar(50)')
        FROM @Request.nodes('/SaveOrder/orderResults/Orders') as T(C)
        WHERE CustomerID = T.C.value('(CustomerID/text())[1]', 'nchar(5)')

        UPDATE  Orders SET 
                OrderDate = T.C.value('(OrderDate/text())[1]', 'datetime'),
                RequiredDate = T.C.value('(RequiredDate/text())[1]', 'datetime'),
                ShippedDate = T.C.value('(ShippedDate/text())[1]', 'datetime'),
                ShipVia = T.C.value('(ShipVia/text())[1]', 'int'),
                Freight = T.C.value('(Freight/text())[1]', 'money'),
                ShipName = T.C.value('(ShipName/text())[1]', 'nvarchar(40)'),
                ShipAddress = T.C.value('(ShipAddress/text())[1]', 'nvarchar(60)'),
                ShipCity = T.C.value('(ShipCity/text())[1]', 'nvarchar(15)'),
                ShipRegion = T.C.value('(ShipRegion/text())[1]', 'nvarchar(15)'),
                ShipPostalCode = T.C.value('(ShipPostalCode/text())[1]', 'nvarchar(10)'),
                ShipCountry = T.C.value('(ShipCountry/text())[1]', 'nvarchar(15)')

        FROM @Request.nodes('/SaveOrder/orderResults/Orders') as T(C)
        WHERE OrderID = @OrderID

        UPDATE  [Order Details] SET 
                UnitPrice = T.C.value('(UnitPrice/text())[1]', 'money'),
                Quantity = T.C.value('(Quantity/text())[1]', 'smallint'),
                Discount = T.C.value('(Discount/text())[1]', 'real')

        FROM @Request.nodes('/SaveOrder/orderResults/Orders/itemResults/Items') as T(C)
        WHERE OrderID = @OrderID
    END
ELSE
    BEGIN
        INSERT INTO Customers
                    (ContactName,
                        Phone)  

        SELECT   T.C.value('(ContactName/text())[1]', 'nvarchar(30)'),
                 T.C.value('(Phone/text())[1]', 'nvarchar(24)')

        FROM @Request.nodes('/SaveOrder/orderResults/Orders') as T(C)


        INSERT INTO Orders(
                OrderDate, 
                RequiredDate, 
                ShippedDate ,
                ShipVia ,
                Freight ,
                ShipName ,
                ShipAddress ,
                ShipCity ,
                ShipRegion ,
                ShipPostalCode ,
                ShipCountry )

        SELECT  T.C.value('(OrderDate/text())[1]', 'datetime'),
                 T.C.value('(RequiredDate/text())[1]', 'datetime'),
                 T.C.value('(ShippedDate/text())[1]', 'datetime'),
                 T.C.value('(ShipVia/text())[1]', 'int'),
                 T.C.value('(Freight/text())[1]', 'money'),
                 T.C.value('(ShipName/text())[1]', 'nvarchar(40)'),
                 T.C.value('(ShipAddress/text())[1]', 'nvarchar(60)'),
                 T.C.value('(ShipCity/text())[1]', 'nvarchar(15)'),
                T.C.value('(ShipRegion/text())[1]', 'nvarchar(15)'),
                T.C.value('(ShipPostalCode/text())[1]', 'nvarchar(10)'),
                 T.C.value('(ShipCountry/text())[1]', 'nvarchar(15)')

        FROM @Request.nodes('/SaveOrder/orderResults/Orders') as T(C)

        INSERT INTO [Order Details]
                    (UnitPrice ,
                    Quantity,
                    Discount)

        SELECT  T.C.value('(UnitPrice/text())[1]', 'money'),
                T.C.value('(Quantity/text())[1]', 'smallint'),
                T.C.value('(Discount/text())[1]', 'real')

        FROM @Request.nodes('/SaveOrder/orderResults/Orders/itemResults/Items') as T(C)

    END
    DECLARE @Counter INT
    SET @Counter = 1