Re: Error When Trying to Use Npgsql to COPY into a PostgreSQL Database

Adrian Klaver <adrian.klaver@xxxxxxxxxxx> · Tue, 24 Jun 2014 13:30:45 -0700

On 06/24/2014 10:47 AM, Altec103 wrote:
I am currently in the process of using an ODBC Connection and a Npgsql
Connection to transfer a database from a Sybase/Advantage platform to a
PostgreSQL platform using C# and the .NET framework.

Below is the code I have come up with to transfer the data itself...

    NpgsqlCommand copyCommand = new NpgsqlCommand("COPY \"2009info.adt\" FROM
STDIN", connectionTest);

             string query = "SELECT * FROM \"2009info.adt\"";
             OdbcCommand test = new OdbcCommand(query, myConnection);
             string dataEntry = "";

             NpgsqlCopyIn copy = new NpgsqlCopyIn(copyCommand,
connectionTest);

             copy.Start();

             OdbcDataReader reader = test.ExecuteReader();

             int rowCount = reader.FieldCount;

             while (reader.Read())
             {

                 for (int i = 0; i < rowCount; i++)
                 {
                     dataEntry = dataEntry + reader[i].ToString() + "|";
                 }

                 dataEntry = dataEntry.Trim().Substring(0, dataEntry.Length -
1);
                 dataEntry = dataEntry.Replace("\r",
string.Empty).Replace("\n", string.Empty);

                 var raw = Encoding.UTF8.GetBytes(dataEntry);
                 copy.CopyStream.Write(raw, 0, raw.Length);

                 dataEntry = "";
             }

             copy.End();

However, nothing happens when this code compiles. And when I look at the log
files I get the following errors.

2014-06-24 13:22:58 EDT CONTEXT:  COPY 2009info.adt, line 1
2014-06-24 13:22:58 EDT STATEMENT:  COPY "2009info.adt" FROM STDIN
2014-06-24 13:22:58 EDT ERROR:  unexpected EOF on client connection with an
open transaction
2014-06-24 13:22:58 EDT CONTEXT:  COPY 2009info.adt, line 1
2014-06-24 13:22:58 EDT STATEMENT:  COPY "2009info.adt" FROM STDIN
2014-06-24 13:22:58 EDT LOG:  could not send data to client: No connection
could be made because the target machine actively refused it.

Anyone have any ideas why this is happening?

AFAICT this:

COPY \"2009info.adt\" FROM STDIN"

Is 2009info.adt supposed to be a table name or a file?
It is in the table position in the command.

If it is a file you cannot COPY from both a file and STDIN at the same 
time.

Otherwise where is the data for STDIN coming from?

For more information see here:

http://www.postgresql.org/docs/9.3/interactive/sql-copy.html

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Adrian Klaver
adrian.klaver@xxxxxxxxxxx