Migration data on SQL

从表里面导出数据XML：

-- export
declare @xml xml
set @xml = (select * from (
select TableName = 'Schema',
       xmlData = ( select * from [Schema] where id = 337 for xml auto, root('Schemas') )
union
select 'SchemaFile',
       ( select Id, SchemaId,
                Data = convert(varchar(max), Data),
                FileName, Fullpath, RelativePath
         from SchemaFile where SchemaId = 337 for xml auto, root('SchemaFiles') ) ) SchemaExport
for xml auto, root('SchemaExports')      )

select @xml

将导出XML数据插入到目的表中：

 -- now import

 declare @idoc int

       declare @tableName varchar(255)
       declare @xmlData xml                

       declare @mappingExport table (TableName varchar(255), xmlData xml)

       exec sp_xml_preparedocument @idoc output, @xml
       insert into @mappingExport
       select *
       from openxml (@idoc, '/SchemaExports/SchemaExport')
       with (TableName varchar(255),
               xmlData nvarchar(max))
       exec sp_xml_removedocument @idoc output 

       declare exportCursor cursor
       for select TableName, xmlData
       from @mappingExport

       open exportCursor

       fetch from exportCursor into @tableName, @xmlData

       while @@fetch_status <> -1
       begin
             exec sp_xml_preparedocument @idoc output, @xmlData

             if (@tableName = 'Schema')
             begin
                   print 'Copying Schema' 

                   select *
                   from openxml (@idoc, '/Schemas/Schema')
                   with (Id int,
                         TenantId int,
                         VersionNo int,
                         ResponseSchemaId int,
                         SchemaName nvarchar(200),
                         SOAPActino varchar(200),
                         LastUpdatedUTC datetime,
                         IsCanonical bit,
                         DocumentType nvarchar(512) )
             end
             else if (@tableName = 'SchemaFile')
             begin
                   print 'Copying SchemaFile'
                   select *, datalength(data), convert(xml, data)
                   from openxml (@idoc, '/SchemaFiles/SchemaFile')
                   with (Id int,
                         SchemaId int,
                         Data varchar(max),
                         FileName nvarchar(255),
                         FullPath nvarchar(255),
                         RelativePath nvarchar(255) )
             end
             exec sp_xml_removedocument @idoc
             fetch next from exportCursor into @tableName, @xmlData
       end   

 select datalength(data), convert(xml, data)
 from schemafile
 where schemaid = 337