将整个表从SQL Server CE数据库复制到另一个表

Question

I'm developing a C# application and I want to copy a whole table from a SQL Server CE database to another programmatically. I know I can use this command in SQL Server, but I'm not sure how to use two database connections in one query in C#.

Select * into DestinationDB.dbo.tableName from SourceDB.dbo.SourceTable

Thanks in advance.

Answer 1

You wouldn't do it the same way as in SQL Server because there's no single server that manages both databases. Your app is the only thing that links the two databases so the the data has to go through your app. You're trying to do it the wrong way and that's why you can't find a solution: you're looking for the wrong thing.

There are examples of this out there. I know, because I've written more than one myself. You simply need to use a data adapter to populate a DataTable from the first database and then a data adapter to save the contents of that DataTable to the second database. If the data sources are the same type then you can even use just one data adapter because the SelectCommand and InsertCommand can have different connections.

using (var adapter = new SqlDataAdapter("SELECT statement here", "source connection string here"))
using (var destinationConnection = new SqlConnection("destination connection string here"))
using (var insertCommand = new SqlCommand("INSERT statement here", destinationConnection))
{
    // Add parameters to insertCommand here.

    adapter.InsertCommand = insertCommand;

    // Leave the RowState of all DataRows as Added so they are ready to be inserted.
    adapter.AcceptChangesDuringFill = false;

    var table = new DataTable();

    // Retrieve data from source and save to destination.
    adapter.Fill(table);
    adapter.Update(table);
}

That example uses SqlClient but it works the same for any provider, including SqlServerCe.