来自 XML 的 SQL CAST

Question

我尝试 CAST 一个 XML 值，例如0.19 到 INT 并用 * 100 计算。

但我收到如下错误： 在 INT 类型中转换 nvarchar-Value '0.19' 时出错。

这是代码：（但带有“CAST”的行是问题）

insert into BELEGP(Kennung, Belegtyp, Belegnummer, Posnummer, Postext, Zeilentyp, Menge, Steuerprozent, Eingabemenge, Editmenge, Artikelnummer, Bezeichnung, Preismenge, Einzelpreis, Gesamtpreis, Netto, Adressnr)

   SELECT  NEWID() as Kennung,
       'F' as Belegtyp,
       Myorder.j.value('OrderNumber[1]', 'varchar(50)') as Belegnummer,
       ROW_NUMBER() OVER (ORDER BY Myorder.j.value('OrderNumber[1]', 'varchar(50)')) as  Posnummer,
       ROW_NUMBER() OVER (ORDER BY Myorder.j.value('OrderNumber[1]', 'varchar(50)')) as  Postext,
       'A' as Zeilentyp,
       MyItem.j.value('Quantity[1]', 'varchar(50)') as Menge,
       CAST(Cast(MyItem.j.value('TaxRate[1]', 'nvarchar(50)') as nvarchar) as INT) * 100 as Steuerprozent,
       MyItem.j.value('Quantity[1]', 'varchar(50)') as Eingabemenge,
       MyItem.j.value('Quantity[1]', 'varchar(50)') as Editmenge,
       MyItem.j.value('Id[1]', 'varchar(50)') as Artikelnummer,
       MyItem.j.value('Name[1]', 'varchar(50)') as Bezeichnung,
       MyItem.j.value('TotalPrice[1]', 'varchar(50)') as Preismenge,
       MyItem.j.value('TotalPrice[1]', 'varchar(50)') as Einzelpreis,
       MyItem.j.value('TotalPrice[1]', 'varchar(50)') as Gesamtpreis,
       MyItem.j.value('UnityPrice[1]', 'varchar(50)') as Netto,
       Myorder.j.value('CustomerNumber[1]', 'varchar(50)') as Adressnr

   FROM (
 SELECT CAST(x AS XML)
 FROM
 OPENROWSET( BULK 'D:\shop\xml\Bestellungen.xml',SINGLE_BLOB) AS k(x))
 AS k(x)
 CROSS APPLY x.nodes('Orders/Order') AS MYorder(j)
 CROSS APPLY x.nodes('Orders/Order/Addresses/BillingAddress') AS MYAddresses(j)
 CROSS APPLY x.nodes('Orders/Order/LineItems/LineItem') AS MYItem(j)

Answer 1

即使您可以将值 0.19 转换为 int，它也会被舍入为 0。我认为您必须以十进制形式获取值，然后进行转换：

declare @Data xml = '<TaxRate>0.19</TaxRate>'
select cast(@Data.value('TaxRate[1]', 'decimal(29, 2)') * 100 as int)