Example: Use metadata ResultSets that have more than one column

//////////////////////////////////////////////////////////////////////////////////
//
// SafeGetUDTs example. This program demonstrates one way to deal with
// metadata ResultSets that have more columns in JDK 1.4 than they
// had in previous releases.
//
// Command syntax:
//    java SafeGetUDTs 
//
//////////////////////////////////////////////////////////////////////////////////
//
// This source is an example of the IBM Developer for Java JDBC driver.
// IBM grants you a nonexclusive license to use this as an example
// from which you can generate similar function tailored to
// your own specific needs.
//
// This sample code is provided by IBM for illustrative purposes
// only. These examples have not been thoroughly tested under all
// conditions. IBM, therefore, cannot guarantee or imply
// reliability, serviceability, or function of these programs.
//
// All programs contained herein are provided to you "AS IS"
// without any warranties of any kind.  The implied warranties of
// merchantability and fitness for a particular purpose are
// expressly disclaimed.
//
// IBM Developer Kit for Java
// (C) Copyright IBM Corp. 2001
// All rights reserved.
// US Government Users Restricted Rights -
// Use, duplication, or disclosure restricted
// by GSA ADP Schedule Contract with IBM Corp.
//
//////////////////////////////////////////////////////////////////////////////////

import java.sql.*;

public class SafeGetUDTs {

    public static int jdbcLevel;

    // Note: Static block runs before main begins.
    // Therefore, there is access to jdbcLevel in
    // main.
    {
        try {
            Class.forName("java.sql.Blob");

            try {
                Class.forName("java.sql.ParameterMetaData");
                // Found a JDBC 3.0 interface.  Must support JDBC 3.0.
                jdbcLevel = 3;
            } catch (ClassNotFoundException ez) {
                // Could not find the JDBC 3.0 ParameterMetaData class.  
                // Must be running under a JVM with only JDBC 2.0 
                // support.
                jdbcLevel = 2;
            }

        } catch (ClassNotFoundException ex) {
            // Could not find the JDBC 2.0 Blob class.  Must be 
            // running under a JVM with only JDBC 1.0 support.
            jdbcLevel = 1;
        }
    }

    // Program entry point.
    public static void main(java.lang.String[] args) 
    {
        Connection c = null;

        try {
            // Get the driver registered.
            Class.forName("com.ibm.db2.jdbc.app.DB2Driver");

            c = DriverManager.getConnection("jdbc:db2:*local");
            DatabaseMetaData dmd = c.getMetaData();

            if (jdbcLevel == 1) {
                System.out.println("No support is provided for getUDTs.  Just return.");
                System.exit(1);
            }

            ResultSet rs = dmd.getUDTs(null, "CUJOSQL", "SSN%", null);
            while (rs.next()) {

                // Fetch all the columns that have been available since the 
                // JDBC 2.0 release.
                System.out.println("TYPE_CAT is " + rs.getString("TYPE_CAT"));
                System.out.println("TYPE_SCHEM is " + rs.getString("TYPE_SCHEM"));
                System.out.println("TYPE_NAME is " + rs.getString("TYPE_NAME"));
                System.out.println("CLASS_NAME is " + rs.getString("CLASS_NAME"));
                System.out.println("DATA_TYPE is " + rs.getString("DATA_TYPE"));
                System.out.println("REMARKS is " + rs.getString("REMARKS"));

                // Fetch all the columns that were added in JDBC 3.0.
                if (jdbcLevel > 2) {
                    System.out.println("BASE_TYPE is " + rs.getString("BASE_TYPE"));
                }
            }
        } catch (Exception e) {
            System.out.println("Error: " + e.getMessage());
        } finally {
            if (c != null) {
                try {
                    c.close();
                } catch (SQLException e) {
                    // Ignoring shutdown exception.
                }
            }
        }
    }
}