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PostGIS adds support for geographic objects to the PostgreSQL object-relational database.
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/*
 * Test.java
 * 
 * PostGIS extension for PostgreSQL JDBC driver - example and test classes
 * 
 * (C) 2004 Paul Ramsey, [email protected]
 * 
 * (C) 2005 Markus Schaber, [email protected]
 * 
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation; either version 2 of the License.
 * 
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
 * details.
 * 
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
 * Place, Suite 330, Boston, MA 02111-1307 USA or visit the web at
 * http://www.gnu.org.
 * 
 * $Id: TestServer.java 1622 2005-04-15 14:04:34Z mschaber $
 */

package examples;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;

public class TestServer {

    public static void main(String[] args) {
        if (args.length != 4 && args.length != 3) {
            System.err.println("Usage: java examples/TestServer dburl user pass [tablename]");
            System.err.println();
            System.err.println("dburl has the following format:");
            System.err.println("jdbc:postgresql://HOST:PORT/DATABASENAME");
            System.err.println("tablename is 'jdbc_test' by default.");
            System.exit(1);
        }

        Connection conn;

        String dburl = args[0];
        String dbuser = args[1];
        String dbpass = args[2];

        String dbtable = "jdbc_test";

        String dropSQL = "drop table " + dbtable;
        String createSQL = "create table " + dbtable + " (geom geometry, id int4)";
        String insertPointSQL = "insert into " + dbtable + " values ('POINT (10 10 10)',1)";
        String insertPolygonSQL = "insert into " + dbtable
                + " values ('POLYGON ((0 0 0,0 10 0,10 10 0,10 0 0,0 0 0))',2)";

        try {

            System.out.println("Creating JDBC connection...");
            Class.forName("org.postgresql.Driver");
            conn = DriverManager.getConnection(dburl, dbuser, dbpass);
            System.out.println("Adding geometric type entries...");
            /*
             * magic trickery to be pgjdbc 7.2 compatible
             * 
             * This works due to the late binding of data types in most java
             * VMs. As this is more a demo source than a real-world app, we can
             * risk breaking on exotic VMs here. Real-world apps usually do not
             * suffer from this problem as they do not have to support such a
             * wide range of different pgjdbc releases, or they can use the
             * approach from org.postgis.DriverWrapper (which we do not use here
             * intentionally to have a test for the other ways to do it).
             */
            if (conn.getClass().getName().equals("org.postgresql.jdbc2.Connection")) {
                ((org.postgresql.Connection) conn).addDataType("geometry", "org.postgis.PGgeometry");
                ((org.postgresql.Connection) conn).addDataType("box3d", "org.postgis.PGbox3d");
            } else {
                ((org.postgresql.PGConnection) conn).addDataType("geometry",
                        "org.postgis.PGgeometry");
                ((org.postgresql.PGConnection) conn).addDataType("box3d", "org.postgis.PGbox3d");
            }
            Statement s = conn.createStatement();
            System.out.println("Creating table with geometric types...");
            // table might not yet exist
            try {
                s.execute(dropSQL);
            } catch (Exception e) {
                System.out.println("Error dropping old table: " + e.getMessage());
            }
            s.execute(createSQL);
            System.out.println("Inserting point...");
            s.execute(insertPointSQL);
            System.out.println("Inserting polygon...");
            s.execute(insertPolygonSQL);
            System.out.println("Done.");
            s = conn.createStatement();
            System.out.println("Querying table...");
            ResultSet r = s.executeQuery("select asText(geom),id from " + dbtable);
            while (r.next()) {
                Object obj = r.getObject(1);
                int id = r.getInt(2);
                System.out.println("Row " + id + ":");
                System.out.println(obj.toString());
            }
            s.close();
            conn.close();
        } catch (Exception e) {
            System.err.println("Aborted due to error:");
            e.printStackTrace();
            System.exit(1);
        }
    }
}