在C＃中的两个SQL Server数据库之间复制数据

Question

I have two databases. One of them belongs to a CRM software and is the source.

The other one will be the destination used by a tool I'm developing.

The destination will contain a table ADDRESSES with a subset of the columns of a table of the same name in the source database.

What is the best (most efficient) way to copy the data between those databases (btw: they're on different SQL Server instances if that's important).

I could write a loop which does INSERT into the destination for each row obtained from the source but I don't think that this is efficient.

My thoughts and information:

• The data won't be altered on its way from source to destination
• It will be altered on its way back
• I don't have the complete structure of the source but I know which fields I need and that they're warranted to be in the source (hence, access to the rows obtained from source isn't possible using the index of columns)
• I can't use LINQ.

Anything leading me in the right direction here is appreciated.

Edit:
I really need a C# way to copy the data. I also need to know how to merge the copied rows back to the source. Is it really necessary (or even best practise) to do this row after row?

Answer 1

Why write code to do this?

The single fastest and easiest way is just to use SQL Server's bcp.exe utility (bcp: B ulk C opy P rogram).

• Export the data from the source server.
• Zip it or tar it if it needs it.
• FTP it over to where it needs to go, if you need to move it to another box.
• Import it into the destination server.

You can accomplish the same thing via SQL Server Management Studio in a number of different ways . Once you've defined the task, it can be saved and it can be scheduled.

You can use SQL Server's Powershell objects to do this as well.

If you're set on doing it in C#:

• write your select query to get the data you want from the source server.
• execute that and populate a temp file with the output.
• execute SQL Server's bulk insert statement against the destination server to insert the data.

Note: For any of these techniques, you'll need to deal with identity columns if the target table has them. You'll also need to deal with key collisions. It is sometimes easier to bulk load the data into a perma-temp table first, and then apply the prerequisite transforms and manipulations to get it to where it needs to go.

Answer 2

According to your comment on Jwrit's answer, you want two way syncs.

If so, you might want to look into Microsoft Sync Framework .

We use it to sync 200+ tables on Premise SQL to SQL Azure and SQL Azure to SQL Azure.

You can use purely C#. However, it might offer a lot more than you want, or it might be over kill for a small project.

I'm just saying so that you can have different option for your project.

Answer 3

If these databases exist on two servers you can setup a link between the servers by executing sp_addlinkedserver there are instructions for setting this up here. This may come in handy if you plan on regularly "Sharing" data.

http://msdn.microsoft.com/en-us/library/ff772782.aspx

Once the servers are linked a simple select statement can copy the rows from one table to another

INSERT INTO db1.tblA( Field1,Field2,Field2 ) SELECT Field1,Field2,Field2 FROM db2.tblB

If the Databases are on the same instance you only need to execute similar SQL to the above

Answer 4

如果这是一次 - 最好的选择通常是SSIS（SQL服务器集成服务），除非有复杂的数据转换 - 你可以快速轻松地进行列映射并在15分钟内完成（可靠）..... 。