Adapter update.

[Murali Maddali <murali.maddali@xxxxxxx>]

Hello Group,

 

I have asked this question already on the NpgSql forum, but didn't get a response so far. Sorry for cross posting, but want to check if any one had any suggestions for my problem.

 

I am trying to do my updates through NpgsqlDataAdapter (I also tried with Odbc driver with no luck) by passing in a Datatable with changes in it, this would take forever to do the updates.

 

This is what I am doing, I am reading the data from SQL Server 2005 and dumping to out to Postgresql 8.2 database.

 

            using (SqlCommand cmd = new SqlCommand(t.SourceSelect, conn))
            {
                using (SqlDataReader r = cmd.ExecuteReader())
                {
                    DataSet ds = new DataSet("postgis");
                    NpgsqlDataAdapter adp = new NpgsqlDataAdapter(t.DestinationSelect, destConn);
                    NpgsqlCommandBuilder cmdBld = new NpgsqlCommandBuilder(adp);
                    adp.Fill(ds, t.DestinationTable);
                    DataTable destTbl = ds.Tables[t.DestinationTable];
                    
                    DataTable srcTblSchema = r.GetSchemaTable();
                    adp.FillSchema(ds, SchemaType.Mapped, t.DestinationTable);
                    

                    // My save method will check if the row exists or not and would add or update accordingly to the datatable (destTbl). The whole process

                    // of comparision is done under 2 mins on 60,000 records.

                    while (r.Read())
                        _save(r, srcTblSchema, destTbl, destConn); 

                    r.Close();

 

                    // This is the where my application goes into lala land. If I call this update in my while loop above, it took about two hours to process

                    // the whole thing

                    adp.Update(destTbl);
                }
            }

 

I have around 60000 records. I also have a geometry field on my table.

 

I have couple of questions.

 

1) What do I do to speed up the process? Any database configuration changes, connection properties, .....

2) When I call the adapter.update does NpgsqlDataAdapter checks to see if the column value really changed or not? I believe SQLDataAdapter does this validation before it actually writes to the database.

 

Any suggestions and comments are greatly appreciated. Right now I am in dead waters and can't get it to work on large datasets.

 

Thank you all.

 

Regards,

Murali K. Maddali

UAI, Inc.

murali.maddali@xxxxxxx

 

"Always bear in mind that your own resolution to succeed is more important than any one thing." - Abraham Lincoln

 

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