SQLServer2005 中 XML类型方法中 XQuery中变量的参数化匆忙整理 IT

数据中建立表
CREATE TABLE [Team](
  [TeamID] [int] IDENTITY(1,1) NOT NULL,
  [TeamDoc] [xml] NOT NULL DEFAULT ('<Team />')
)

插入资料
insert [Team]([TeamDoc])
values('
<Team name="Braves">
<Players>
<Pitcher name="John Smoltz" role="Closer" />
<Pitcher name="Russ Ortiz" role="Starter" />
<ThirdBase name="Chipper Jones" role="Starter" bats="switch" />
</Players>
</Team>')

1 .根据name动态查询记录，可以借助ADO.net 的
SqlCommand.CommandText = "
select TeamDoc.query('Team/Players/Pitcher[@name=sql:variable(""@paramvalue"")]')
from Team ";
SqlCommand.AddParamter("@paramvalue","John Smoltz");

2.SQL直接实现:
declare @sql nvarchar(max)
set @sql = N'
select
TeamDoc.query(''Team/Players/Pitcher[@name=sql:variable("@paramvalue")]'')
from Team '
execute sp_executesql @sql,N'@paramvalue nvarchar(max)',@paramvalue=N'John Smoltz'
//------------------------------------------------------------------------------------------------------

参考别人：
1. 使用表栏位做参数
DECLARE @names xml
SET @names = '<root> <row id="1">aa</row> <row id="2">bb</row> </root>'
SELECT A.id, [name] = @names.value('(/root/row[@id=sql:column("id")])[1]', 'varchar(10)')
FROM( SELECT id = 1 UNION ALL SELECT id = 2 )A

2.使用SQL 变量作为参数
DECLARE @a xml
SET @a = '<root> <row id="1">aa</row> <row id="2">bb</row> </root>'
DECLARE @id nvarchar(50)
SET @id = '2'
SELECT @a.value('(/root/row[@id=sql:variable("@id")])[1]', 'varchar(10)')