Re: Strange behaviour of JDBC driver for PostgreSQL

Dave Cramer wrote:

>Carlos,
>
>Sorry, I didn't read your email carefully enough. The driver won't work
>with a 6.5.2 database, my apologies. You will need to upgrade the remote
>server
>
>Dave
>
>On Tue, 2002-12-17 at 12:54, Carlos Correia wrote:
>
>
>>I have problems with PostgreSQL when connecting from another machine in
>>the same network, after upgrading to 7.2.2 (Mandrake 9.0).
>>
>>When invoking 'getColumns()' on a DatabaseMetaData object I get (very)
>>different results when I invoke it in the local machine (in which works
>>good) then when I invoke it in another machine in the network as you can
>>see below:
>>
>>I've made a small Java class to reproduce its bizarre behaviour (I'm
>>using the same driver in both machines -
>>/usr/share/pgsql/jdbc7.2dev-1.2.jar from Mandrake 9.0), here is its output:
>>
>>
>>==================================
>>LOCAL MACHINE:
>>Database: PostgreSQL
>>Version: 7.2.2
>>
>>
>>schemas:
>>
>>
>>catalogs:
>>template1
>>template0
>>sedb
>>
>>Fields for table: 'test'
>>ID TYPE TYPNAME NAME LEN NULLABLE
>>1 4 int4 4 NO
>>2 1 bpchar 20 YES
>>
>>===================================
>>REMOTE MACHINE IN THE SAME NETWORK:
>>Database: PostgreSQL
>>Version: 6.5.2
>>
>>
>>schemas:
>>
>>
>>
>>catalogs:
>>
>>
>>Fields for table: 'test'
>>ID TYPE TYPNAME NAME LEN NULLABLE
>>ERROR: No such attribute or function 'oid'
>>
>>
>>java.sql.SQLException: ERROR: No such attribute or function 'oid'
>>
>>org.postgresql.Connection.ExecSQL(Connection.java at :393)
>>org.postgresql.jdbc2.DatabaseMetaData.getColumns( at DatabaseMetaData.jav
>>a:1880)
>>at DbTester.(DbTester.java:41)
>>at DbTester.main(DbTester.java:115)
>>
>>================================
>>LAST LINES OF '/var/lib/pgsql/data/pg_hba.conf':
>>local all ident sameuser
>>host all 192.168.1.2 255.255.255.0 trust
>>
>>191.168.1.2 is the client machine, running the same version of JDK (1.4.0).
>>
>>Here is the test program that illustrates this behaviour:
>>
>>import java.util.*;
>>import java.text.*;
>>import java.io.*;
>>
>>import java.sql.*;
>>
>>///////////////////////////////////////////////// ///////////
>>public class DbTester
>>{
>>Connection connection = null;
>>DatabaseMetaData dbmd = null;
>>
>>//////////////////////////////////////////////// ////////////
>>public DbTester()
>>throws SQLException, ClassNotFoundException,
>>FileNotFoundException, IOException
>>{
>>Class.forName( "org.postgresql.Driver" );
>>Connection connection =
>>DriverManager.getConnection(
>>"jdbc:postgresql://devo/sedb", "carlos", "" );
>>dbmd = connection.getMetaData();
>>String databaseProductName = dbmd.getDatabaseProductName();
>>String databaseProductVersion = dbmd.getDatabaseProductVersion();
>>
>>System.out.println(
>>"Database: " databaseProductName
>>"nVersion: " databaseProductVersion );
>>
>>printSchemas();
>>printCatalogs();
>>System.out.println(
>>"nFields for table: 'test'"
>>"nIDtTYPEtTYPNAMEtNAMEtLENtNULLABLE" );
>>ResultSet rs = dbmd.getColumns( "%", "%", "test", "%" );
>>while( rs.next() )
>>printField( rs );
>>rs.close();
>>}
>>
>>
>>//////////////////////////////////////////////// ////////////
>>public void printField( ResultSet rs )
>>throws SQLException
>>{
>>System.out.println(
>>rs.getInt( 17 ) "t" rs.getInt( 5 ) "t"
>>rs.getString( 6 ) "t" rs.getInt( 7 ) "t"
>>rs.getString( 18 ) );
>>}
>>
>>//////////////////////////////////////////////// ////////////
>>public void printSchemas()
>>throws SQLException
>>{
>>System.out.println( "nn schemas:" );
>>ResultSet rs = dbmd.getSchemas();
>>while ( rs.next() )
>>System.out.println( rs.getString( 1 ) );
>>rs.close();
>>}
>>
>>//////////////////////////////////////////////// ////////////
>>public void printCatalogs()
>>throws SQLException
>>{
>>System.out.println( "nn catalogs:" );
>>ResultSet rs = dbmd.getCatalogs();
>>while ( rs.next() )
>>System.out.println( rs.getString( 1 ) );
>>rs.close();
>>}
>>
>>//////////////////////////////////////////////// ////////////
>>public static void main( String[] args )
>>{
>>try
>>{
>>new DbTester();
>>}
>>catch( Exception e )
>>{
>>System.out.println( e.getMessage() );
>>e.printStackTrace();
>>}
>>}
>>
>>}
>>
>>best Regards,
>>
>>Carlos Correia
>>
>>
>>
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>>
>>
The information that is correct is the one from the localhost (version
7.2.2)
I've never used such a version (6.x.x).

I've downloaded the 7.3 driver (pg73jdbc3.jar) and... It happened the
same (even with the same line numbers in the SQLException's stack
trace). I'm sure I made no mistake!
Note: I'm also sure there are no more Postgres installations in the
network.

Carlos Correia