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

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(dot)klaver(at)aklaver(dot)com