1、读取Xml文件，方法是使用OPENXML，具体参考：https://www.cnblogs.com/JuneZhang/p/5146392.html
Xml文件：
SQL:
DECLARE @idoc int --定义一个指向Xml节点路径的指针
DECLARE @xml xml
SELECT @xml=bulkcolumn FROM OPENROWSET( BULK \'D:\ReadWriteXML\FTPInfos.xml\', SINGLE_BLOB) AS x --打开一个Xml
SELECT @xml
EXEC sp_xml_preparedocument @idoc OUTPUT, @xml
SELECT *
FROM OPENXML (@idoc, \'/FTPInfos/FTPInfo\',0) --参数定义看上边的参考链接
WITH (UserName nvarchar(30) ,
Password nvarchar(20),
Id nvarchar(20),
FileNameStart nvarchar(20) \'/FTPInfos/FTPInfo/Download/@FileNameStart\',
FileExtension nvarchar(20) \'/FTPInfos/FTPInfo/Download/@FileExtension\',
FTPPath nvarchar(20) \'/FTPInfos/FTPInfo/Download/@FTPPath\',
LocalTempDir nvarchar(20) \'/FTPInfos/FTPInfo/Download/@LocalTempDir\',
LocalTargetDir nvarchar(20) \'/FTPInfos/FTPInfo/Download/@LocalTargetDir\',
LocalBackupDir nvarchar(20) \'/FTPInfos/FTPInfo/Download/@LocalBackupDir\',
FileType nvarchar(20) \'/FTPInfos/FTPInfo/Download/ServiceDisplay/@FileType\',
Remark nvarchar(20) \'/FTPInfos/FTPInfo/Download/ServiceDisplay/@Remark\',
Enabled nvarchar(20) \'/FTPInfos/FTPInfo/Download/ServiceControl/@Enabled\',
CronExpression nvarchar(20) \'/FTPInfos/FTPInfo/Download/ServiceControl/@CronExpression\',
ThreadCount nvarchar(20) \'/FTPInfos/FTPInfo/Download/ServiceControl/@ThreadCount\'
)
SELECT *
FROM OPENXML (@idoc, \'/FTPInfos/FTPInfo\',0)
WITH (UserName nvarchar(30) ,
Password nvarchar(20),
Id nvarchar(20),
FileNameStart nvarchar(20) \'/FTPInfos/FTPInfo/Upload/@FileNameStart\',
FileExtension nvarchar(20) \'/FTPInfos/FTPInfo/Upload/@FileExtension\',
FTPTargetPath nvarchar(20) \'/FTPInfos/FTPInfo/Upload/@FTPTargetPath\',
FTPTempPath nvarchar(20) \'/FTPInfos/FTPInfo/Upload/@FTPTempPath\',
LocalSourceDir nvarchar(20) \'/FTPInfos/FTPInfo/Upload/@LocalSourceDir\',
LocalBackupDir nvarchar(20) \'/FTPInfos/FTPInfo/Upload/@LocalBackupDir\',
FileType nvarchar(20) \'/FTPInfos/FTPInfo/Upload/ServiceDisplay/@FileType\',
Remark nvarchar(20) \'/FTPInfos/FTPInfo/Upload/ServiceDisplay/@Remark\',
Enabled nvarchar(20) \'/FTPInfos/FTPInfo/Upload/ServiceControl/@Enabled\',
CronExpression nvarchar(20) \'/FTPInfos/FTPInfo/Upload/ServiceControl/@CronExpression\',
ThreadCount nvarchar(20) \'/FTPInfos/FTPInfo/Upload/ServiceControl/@ThreadCount\'
)
EXEC sp_xml_removedocument @idoc --释放指针
以上就是读取附件Xml的SQL,读取到的Download和Upload会保存到两个表，这里就不做insert了。
备注：因为数据库是服务器的，所以读取的xml的绝对路径也是服务器的,字段定义根据需求来。
2、输出Xml到服务器物理路径下，这里随便找了个表生成了一个Xml.参考：https://www.cnblogs.com/biwork/p/3431257.html
做法是使用XP_CMDSHELL+BCP写出的SQL执行的：
EXEC sp_configure \'show advanced options\', 1
GO
RECONFIGURE
GO
EXEC sp_configure \'xp_cmdshell\', 1
GO
RECONFIGURE
GO
EXEC XP_CMDSHELL \'BCP "SELECT(SELECT Id as \'\'student/@studentID\'\',Code \'\'student/@studentName\'\',Name \'\'student/teacher/@teacherID\'\',ParameterValue \'\'student/teacher/@teacherName\'\',Description \'\'student/teacher/Address/@teacherAddress\'\', Id as \'\'student1/@studentID\'\',Code \'\'student1/@studentName\'\',Name \'\'student1/teacher/@teacherID\'\',ParameterValue \'\'student1/teacher/@teacherName\'\',Description \'\'student1/teacher/Address/@teacherAddress\'\' FROM [Xxx.Module].[dbo].[SysParameter] FOR XML path(\'\'FTPInfo\'\'),TYPE, ELEMENTS ,ROOT(\'\'FTPInfos\'\'))AS XML_Order " QUERYOUT "D:\text.xml" -c -T -x\' --注：这段SQL，如果用的是查询语句，必须放在一行，换行会报错，不知道为什么，如果查询SQL太长可以写个存储过程，然后放进来,类似于下边注释的这种
--DECLARE @Sqlcmd NVARCHAR(max)
--SET @Sqlcmd=\'EXEC master.sys.xp_cmdshell \'\'bcp "EXEC Demo.dbo.p1" queryout E:\hqdst\\'+ CONVERT(VARCHAR(10),GETDATE(),112)+REPLACE(CONVERT(VARCHAR(8),GETDATE(),8),\':\',\'\')+\'.xml -c -q -T\'\'\'
--EXEC(@Sqlcmd)
EXEC sp_configure \'show advanced options\', 1
GO
RECONFIGURE
GO
EXEC sp_configure \'xp_cmdshell\', 0
GO
RECONFIGURE
GO
结果：