Demonstrate Simple Use of the CachedRowSet

package com.darwinsys;
 
/*
 * Copyright (c) Ian F. Darwin, http://www.darwinsys.com/, 1996-2002.
 * All rights reserved. Software written by Ian F. Darwin and others.
 * $Id: LICENSE,v 1.8 2004/02/09 03:33:38 ian Exp $
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 * 
 * Java, the Duke mascot, and all variants of Sun's Java "steaming coffee
 * cup" logo are trademarks of Sun Microsystems. Sun's, and James Gosling's,
 * pioneering role in inventing and promulgating (and standardizing) the Java 
 * language and environment is gratefully acknowledged.
 * 
 * The pioneering role of Dennis Ritchie and Bjarne Stroustrup, of AT&T, for
 * inventing predecessor languages C and C++ is also gratefully acknowledged.
 */
 
import javax.sql.rowset.CachedRowSet;
 
/**
 * Demonstrate simple use of the CachedRowSet. The RowSet family of interfaces
 * is in JDK1.5, but the Implementation classes are (as of Beta 1) still in the
 * unsupported "com.sun" package.
 */
public class CachedRowSetDemo {
    public static final String ROWSET_IMPL_CLASS = "com.sun.rowset.CachedRowSetImpl";
 
    public static void main(String[] args) throws Exception {
	CachedRowSet rs;
 
	// Create the class with class.forName to avoid importing
	// from the unsupported com.sun packages.
	Class c = Class.forName(ROWSET_IMPL_CLASS);
	rs = (CachedRowSet) c.newInstance();
 
	rs.setUrl("jdbc:postgresql:tmclub");
	rs.setUsername("ian");
	rs.setPassword("secret");
 
	rs.setCommand("select * from members where name like ?");
	rs.setString(1, "I%");
 
	// This will cause the RowSet to connect, fetch its data, and
	// disconnect
	rs.execute();
 
	// Some time later, the client tries to do something.
 
	// Suppose we want to update data:
	while (rs.next()) {
	    if (rs.getInt("id") == 42) {
		rs.setString(1, "Marvin");
		rs.updateRow(); // Normal JDBC
 
		// This additional call tells the CachedRowSet to connect
		// to its database and send the updated data back.
		rs.acceptChanges();
	    }
	}
 
	// If we're all done...
	rs.close();
    }
}