Question

I have two similar tables on different databases.

Database1/TableA

Database2/TableA

I want to fetch a row from one table and insert it into other table on other server. Like:

Database1/TableA
Id        State            Name
500        OH              John  [Fetch this row]

Database2/TableA
Id        State            Name
1          OH              John  [Insert and fetch PK '1']

I tried this using bulkcopy and it works fine.

But problem is I need to get PK from the new insert as I need to populate another child table.

Is there any better way to achieve this? Please on C# code, no database linking or SQL queries. Just C# solutions. Or if query can be used in C# code that is fine. Any working example code with Dataset or Datarow will be great help.

Thanks!

Answer 1

First you need to get the row(s) from Database.TableA. You could for example use a SqlDataAdapter with a DataTable or a SqlDataReader.

SCOPE_IDENTITY returns the last identity value inserted into an identity column in the same scope. A scope is a module: a stored procedure, trigger, function, or batch. Therefore, two statements are in the same scope if they are in the same stored procedure, function, or batch.

You can use SqlCommand.ExecuteScalar to execute the insert command and retrieve the new ID in one query.

const String sqlSelect = "SELECT COL1,COl2,Col3 FROM TableA WHERE COL1=@COL1;"
const String sqlInsert = "INSERT INTO TableA (COl2,Col3)VALUES (@Col2,@Col3);"
                       + "SELECT CAST(scope_identity() AS int)";
using (var con1 = new SqlConnection(db1ConnectionString))
using (var con2 = new SqlConnection(db2ConnectionString))
{
    con1.Open();
    con2.Open();
    using(var selectCommand = new SqlCommand(sqlSelect, con1))
    {
        selectCommand.Parameters.AddWithValue("@COL1", 4711);
        using (var reader = selectCommand.ExecuteReader())
        {
            if (reader.Read())
            {
                int newID;
                using (var insertCommand = new SqlCommand(sqlInsert, con2))
                {
                    for (int i = 0; i < reader.FieldCount; i++)
                    {
                        insertCommand.Parameters.AddWithValue("@" + reader.GetName(i), reader[i]);
                    }
                    newID = (int)insertCommand.ExecuteScalar();
                }
            }
        }
    }
}