Re: jdbc / getTables bug? - Mailing list pgsql-jdbc

Yes, this is a known problem and I believe has been fixed in cvs. If you
want you can pick up the jars from jdbc.fastcrypt.com

Dave
----- Original Message -----
From: "Laurette Cisneros" <laurette@nextbus.com>
To: <pgsql-jdbc@postgresql.org>
Sent: Monday, June 18, 2001 3:04 PM
Subject: [JDBC] jdbc / getTables bug?


> Is anyone aware of a problem in the jdbc driver for the getTables()
> function when a view is present?  I'm getting a null pointer exception:
> Exception caught.
> java.lang.NullPointerException
> java.lang.NullPointerException
>          at
>
org.postgresql.jdbc2.DatabaseMetaData.getTables(DatabaseMetaData.java:1707)
>          at mettst.doDatabaseMetaData(mettst.java:20)
>          at mettst.<init>(mettst.java:73)
>          at mettst.main(mettst.java:126)
>
> I'm using Postgresql version 7.1 and 7.1.2 and this occurs in both.  This
> exception only occurs if a view is present.
>
> Here's the complete java code to reproduce this (this problem was
> encountered when I ran the metadata example that came with the jdbc dirver
> code was run against my database.  I narrowed down a test for this problem
> using this example).  Any ideas?
>
> Thanks.
>
> ---------------------------- 8< -----------------------------8<
> -----------------------------
>
> import java.io.*;
> import java.sql.*;
> import java.text.*;
>
> /**
>   * Test jdbc view bug
>   * To use it, simply have a database created. It will create some work
tables
>   * and run tests on them.
>   */
>
> public class mettst
> {
>    Connection       db;          // The connection to the database
>    Statement        st;          // Our statement to run queries with
>    DatabaseMetaData dbmd;        // This defines the structure of the
database
>
>    public void doDatabaseMetaData() throws SQLException {
>
>      displayResult(dbmd.getTables(null,null,null,null));
>
>    }
>
>    public void init() throws SQLException {
>      System.out.println("Creating tables and view");
>      cleanup();
>      st.executeUpdate("create table x " +
>                        "(col1 text);");
>      st.executeUpdate("create view vx as " +
>                         "select col1 " +
>                           "from x;");
>    }
>
>    public void cleanup() throws SQLException {
>      System.out.println("Cleaning up...");
>      try {
>        st.executeUpdate("drop table x;");
>      } catch(Exception ex) {
>        // ignore any errors here
>      }
>      try {
>        st.executeUpdate("drop view vx;");
>      } catch(Exception ex) {
>        // ignore any errors here
>      }
>    }
>
>    public mettst() throws ClassNotFoundException, FileNotFoundException,
> IOException, SQLException
>    {
>      String url = "jdbc:postgresql://derby:5432/mettst";
>      String usr = "user1";
>      String pwd = "";
>
>      // Load the driver
>      Class.forName("org.postgresql.Driver");
>
>      // Connect to database
>      System.out.println("Connecting to Database URL = " + url);
>      db = DriverManager.getConnection(url, usr, pwd);
>
>      System.out.println("getMetaData()");
>      dbmd = db.getMetaData();
>      st = db.createStatement();
>
>      // This prints the backend's version
>      System.out.println("Connected to "+dbmd.getDatabaseProductName()+"
> "+dbmd.getDatabaseProductVersion());
>
>      init();
>
>      System.out.println("Now the test...");
>
>      // Now the test
>      doDatabaseMetaData();
>
>      System.out.println("\nNow closing the connection");
>      st.close();
>      db.close();
>
>      cleanup();
>    }
>
>    /**
>     * This displays a result set.
>     * Note: it closes the result once complete.
>     */
>    public void displayResult(ResultSet rs) throws SQLException
>    {
>     System.out.println("Dispay ResultSet");
>      ResultSetMetaData rsmd = rs.getMetaData();
>      int count=0;
>
>      // Print the result column names
>      int cols = rsmd.getColumnCount();
>      for(int i=1;i<=cols;i++)
>        System.out.print(rsmd.getColumnLabel(i)+(i<cols?"\t":"\n"));
>
>      // now the results
>      while(rs.next()) {
>        count++;
>        for(int i=1;i<=cols;i++) {
>          Object o = rs.getObject(i);
>          if(rs.wasNull())
>            System.out.print("{null}"+(i<cols?"\t":"\n"));
>          else
>            System.out.print(o.toString()+(i<cols?"\t":"\n"));
>        }
>      }
>
>      System.out.println("Result returned "+count+" rows.");
>
>      // finally close the result set
>      rs.close();
>    }
>
>    public static void main(String args[])
>    {
>      System.out.println("PostgreSQL metdata tester v6.4 rev 1\n");
>
>      // This line outputs debug information to stderr. To enable this,
simply
>      // add a parameter to the command line
>      if(args.length>0)
>        DriverManager.setLogStream(System.err);
>
>      // Now run the tests
>      try {
>        mettst test = new mettst();
>      } catch(Exception ex) {
>        System.err.println("Exception caught.\n"+ex);
>        ex.printStackTrace();
>      }
>    }
> }
>
>
> Laurette Cisneros
> NextBus Information Systems
> laurette@nextbus.com
> (510) 420-3137
> Why wait?
> www.nextbus.com
>
>
>
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