Обсуждение: JDBC tutorial code

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JDBC tutorial code

От
Neil Kidd
Дата:
Hello,
I have followed the JDBC tutorial code at
http://www.postgresql.org/devel-corner/docs/programmer/jdbc-lo.htm
and keep getting an sqlException from the JDBC driver. I need to deal with
BLOBS. Text fields etc work fine.
The exception states: InputStream not supported.

The code is as follows:

import java.sql.*;
import java.io.*;

public class dbtest
{
   public static void main( String[] args )
   {
     // Load the driver
     try
     {
       // Load the driver class
       Class.forName( "org.postgresql.Driver" );

       // Define the data source for the driver
       String dbURL = "jdbc:postgresql://192.168.0.3/mynewdb";

       // Create a connection through the DriverManager
       Connection dbCon = DriverManager.getConnection( dbURL, USER , PASS );

       dbCon.setAutoCommit( false );

       File              file = new File(
"D:\\dev\\code\\dbtest\\jdbc7.0-1.2.jar" );
       FileInputStream   fis  = new FileInputStream( file );
       PreparedStatement ps   = dbCon.prepareStatement( "insert into test1
values (?,?)" );

       ps.setString( 1, file.getName() );
       ps.setBinaryStream( 2, fis, ( int )file.length() );
       ps.executeUpdate();
       ps.close();
       fis.close();
     }
     catch( ClassNotFoundException cnfe )
     {
       System.err.println( "1 " + cnfe );
     }
     catch( SQLException sqle )
     {
       System.err.println( "2 " + sqle );
       sqle.printStackTrace(System.err);
     }
     catch( FileNotFoundException fnfe )
     {
       System.err.println( "3 " + fnfe );
     }
     catch( IOException ioe )
     {
       System.err.println( "4 " + ioe );
     }
   }

Thanks in advance for any help.
Regards,
Neil
----------------------------------------------------------------
From:            Neil Kidd
Website:        http://www.kidd.org.uk
E-mail:           neil@kidd.org.uk
----------------------------------------------------------------

Re: JDBC tutorial code

От
Steve Waldman
Дата:
Neil,

For some reason, postgres' JDBC driver doesn't implement
PreparedStatement.setBinaryStream().
Use PreparedStatement.setBytes() instead.

Try this...

  InputStream is = new BufferedInputStream(
                     new FileInputStream( file ) );
  ByteArrayOutputStream baos = new ByteArrayOutputStream();
  for (int b = is.read(); b >=0; b = is.read())
     baos.write(b);
  ps.setBytes(2, baos.toByteArray());

Hope this helps,
    Steve


On Tue, Dec 12, 2000 at 11:55:06AM +0000, Neil Kidd wrote:
>
> Hello,
> I have followed the JDBC tutorial code at
> http://www.postgresql.org/devel-corner/docs/programmer/jdbc-lo.htm
> and keep getting an sqlException from the JDBC driver. I need to deal with
> BLOBS. Text fields etc work fine.
> The exception states: InputStream not supported.
>
> The code is as follows:
>
> import java.sql.*;
> import java.io.*;
>
> public class dbtest
> {
>    public static void main( String[] args )
>    {
>      // Load the driver
>      try
>      {
>        // Load the driver class
>        Class.forName( "org.postgresql.Driver" );
>
>        // Define the data source for the driver
>        String dbURL = "jdbc:postgresql://192.168.0.3/mynewdb";
>
>        // Create a connection through the DriverManager
>        Connection dbCon = DriverManager.getConnection( dbURL, USER , PASS );
>
>        dbCon.setAutoCommit( false );
>
>        File              file = new File(
> "D:\\dev\\code\\dbtest\\jdbc7.0-1.2.jar" );
>        FileInputStream   fis  = new FileInputStream( file );
>        PreparedStatement ps   = dbCon.prepareStatement( "insert into test1
> values (?,?)" );
>
>        ps.setString( 1, file.getName() );
>        ps.setBinaryStream( 2, fis, ( int )file.length() );
>        ps.executeUpdate();
>        ps.close();
>        fis.close();
>      }
>      catch( ClassNotFoundException cnfe )
>      {
>        System.err.println( "1 " + cnfe );
>      }
>      catch( SQLException sqle )
>      {
>        System.err.println( "2 " + sqle );
>        sqle.printStackTrace(System.err);
>      }
>      catch( FileNotFoundException fnfe )
>      {
>        System.err.println( "3 " + fnfe );
>      }
>      catch( IOException ioe )
>      {
>        System.err.println( "4 " + ioe );
>      }
>    }
>
> Thanks in advance for any help.
> Regards,
> Neil
> ----------------------------------------------------------------
> From:            Neil Kidd
> Website:        http://www.kidd.org.uk
> E-mail:           neil@kidd.org.uk
> ----------------------------------------------------------------

Re: JDBC tutorial code

От
Neil Kidd
Дата:
Steve,
Thanks very much, it works a treat :-)))

Merry xmas,
Neil.

At 13:00 12/12/00 -0500, you wrote:
>Neil,
>
>For some reason, postgres' JDBC driver doesn't implement
>PreparedStatement.setBinaryStream().
>Use PreparedStatement.setBytes() instead.
>
>Try this...
>
>   InputStream is = new BufferedInputStream(
>                      new FileInputStream( file ) );
>   ByteArrayOutputStream baos = new ByteArrayOutputStream();
>   for (int b = is.read(); b >=0; b = is.read())
>      baos.write(b);
>   ps.setBytes(2, baos.toByteArray());
>
>Hope this helps,
>     Steve
>
>
>On Tue, Dec 12, 2000 at 11:55:06AM +0000, Neil Kidd wrote:
> >
> > Hello,
> > I have followed the JDBC tutorial code at
> > http://www.postgresql.org/devel-corner/docs/programmer/jdbc-lo.htm
> > and keep getting an sqlException from the JDBC driver. I need to deal with
> > BLOBS. Text fields etc work fine.
> > The exception states: InputStream not supported.
> >
> > The code is as follows:
> >
> > import java.sql.*;
> > import java.io.*;
> >
> > public class dbtest
> > {
> >    public static void main( String[] args )
> >    {
> >      // Load the driver
> >      try
> >      {
> >        // Load the driver class
> >        Class.forName( "org.postgresql.Driver" );
> >
> >        // Define the data source for the driver
> >        String dbURL = "jdbc:postgresql://192.168.0.3/mynewdb";
> >
> >        // Create a connection through the DriverManager
> >        Connection dbCon = DriverManager.getConnection( dbURL, USER ,
> PASS );
> >
> >        dbCon.setAutoCommit( false );
> >
> >        File              file = new File(
> > "D:\\dev\\code\\dbtest\\jdbc7.0-1.2.jar" );
> >        FileInputStream   fis  = new FileInputStream( file );
> >        PreparedStatement ps   = dbCon.prepareStatement( "insert into test1
> > values (?,?)" );
> >
> >        ps.setString( 1, file.getName() );
> >        ps.setBinaryStream( 2, fis, ( int )file.length() );
> >        ps.executeUpdate();
> >        ps.close();
> >        fis.close();
> >      }
> >      catch( ClassNotFoundException cnfe )
> >      {
> >        System.err.println( "1 " + cnfe );
> >      }
> >      catch( SQLException sqle )
> >      {
> >        System.err.println( "2 " + sqle );
> >        sqle.printStackTrace(System.err);
> >      }
> >      catch( FileNotFoundException fnfe )
> >      {
> >        System.err.println( "3 " + fnfe );
> >      }
> >      catch( IOException ioe )
> >      {
> >        System.err.println( "4 " + ioe );
> >      }
> >    }
> >
> > Thanks in advance for any help.
> > Regards,
> > Neil
> > ----------------------------------------------------------------
> > From:            Neil Kidd
> > Website:        http://www.kidd.org.uk
> > E-mail:           neil@kidd.org.uk
> > ----------------------------------------------------------------

----------------------------------------------------------------
From:            Neil Kidd
Website:        http://www.kidd.org.uk
E-mail:           neil@kidd.org.uk
----------------------------------------------------------------