将xml作为输入参数传递给存储过程

Posted 2020-10-07 白羽轻飘

1 查看存储过程的方式

  

  exec sp_helptext \'GetTrackingFeedLogByMaxId\'



  select definition from sys.sql_modules
  where object_id=(OBJECT_ID(N\'GetTrackingFeedLogByMaxId\'))

2 在调用有输入参数的存储过程时必须包含参数，除非参数有默认值

3 系统存储过程sp_xml_preparedocument和OPENXML函数来操作传入的xml文档

DECLARE @XMLDocHandle int

declare @xml varchar(1000)=\'<ROOT>
  <CurrencyList FromCurrencyCode="USD" ToCurrencyCode="AUD"></CurrencyList>
  <CurrencyList FromCurrencyCode="USD" ToCurrencyCode="EUR"></CurrencyList>
  <CurrencyList FromCurrencyCode="USD" ToCurrencyCode="GBP"></CurrencyList>
  <CurrencyList FromCurrencyCode="USD" ToCurrencyCode="MXN"></CurrencyList>
</ROOT>
\'

execute sp_xml_preparedocument @XMLDocHandle output,@xml

SELECT FromCurrencyCode,ToCurrencyCode
FROM OPENXML(@XMLDocHandle,\'/ROOT/CurrencyList\',1)
       WITH
       (
         FromCurrencyCode char(3),
         ToCurrencyCode char(3)
       )

注意变量必须定义为@XMLDocHandle变量

执行效果如下

3 xml作为存储过程的参数示例

--将xml作为存储过程的输入参数
create procedure getCurrentRatesXML
@XMLList varchar(1000),
@CurrencyRateDate datetime

AS
declare @XMLDocHandle int
declare @CurrencyCodeTable table
(
  FromCurrencyCode char(3),
  ToCurrencyCode char(3)
)

--准备xml文档
execute sp_xml_preparedocument @XMLDocHandle output,@XMLList;

INSERT INTO @CurrencyCodeTable(FromCurrencyCode,ToCurrencyCode)
SELECT FromCurrencyCode,ToCurrencyCode
FROM OPENXML(@XMLDocHandle,\'/ROOT/CurrencyList\',1)
       WITH
       (
         FromCurrencyCode char(3),
         ToCurrencyCode char(3)
       );

SELECT *
FROM Sales.CurrencyRate cr
     JOIN @CurrencyCodeTable TVP
     ON cr.FromCurrencyCode=TVP.FromCurrencyCode
     AND cr.ToCurrencyCode=TVP.ToCurrencyCode
WHERE CurrencyRateDate=@CurrencyRateDate;

--移除文档
execute sp_xml_removedocument @XMLDocHandle;
go