Concurrency in ResultSet

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[edit] Overview - Concurrency in ResultSet

This [[Category:Java|Java example] shows how to concurrency in result set with JDBC.

[edit] Java Source Code

  • Package: com.sun.example
  • File: TypeConcurrency.java
package com.sun.example;
 
/*
 Copyright 2003 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 Use of this software is authorized pursuant to the terms of the license found at
 http://developer.java.sun.com/berkeley_license.html.
 
 Copyright 2003 Sun Microsystems, Inc. All Rights Reserved.  
 Redistribution and use in source and binary forms, with or without modification,
 are permitted provided that the following conditions are met: 
 
 - Redistribution of source code must retain the above copyright notice, 
 this list of conditions and the following disclaimer.
 
 - Redistribution 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.
 
 Neither the name of Sun Microsystems, Inc. or the names of contributors may 
 be used to endorse or promote products derived from this software without
 specific prior written permission.
 
 This software is provided "AS IS," without a warranty of any kind.  
 ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING
 ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR
 NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN MICORSYSTEMS, INC. ("SUN")
 AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE
 AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
 DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR ANY LOST
 REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, 
 INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF
 LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN
 IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
 
 You acknowledge that this software is not designed, licensed or intended for
 use in the design, construction, operation or maintenance of any nuclear
 facility.
 
 
 */
 
/*
 * Copyright 2003 Sun Microsystems, Inc.  ALL RIGHTS RESERVED.
 * Use of this software is authorized pursuant to the terms of the license found at
 * http://developer.java.sun.com/berkeley_license.html.
 */
 
import java.sql.*;
 
public class TypeConcurrency {
 
    public static void main(String args[]) {
 
	String url = "jdbc:mySubprotocol:myDataSource";
	Connection con;
	Statement stmt;
	try {
 
	    Class.forName("myDriver.ClassName");
 
	} catch (java.lang.ClassNotFoundException e) {
	    System.err.print("ClassNotFoundException: ");
	    System.err.println(e.getMessage());
	}
 
	try {
 
	    con = DriverManager.getConnection(url, "myLogin", "myPassword");
 
	    stmt = con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,
		    ResultSet.CONCUR_READ_ONLY);
 
	    ResultSet srs = stmt.executeQuery("SELECT * FROM COFFEES");
 
	    int type = srs.getType();
 
	    System.out.println("srs is type " + type);
 
	    int concur = srs.getConcurrency();
 
	    System.out.println("srs has concurrency " + concur);
	    while (srs.next()) {
		String name = srs.getString("COF_NAME");
		int id = srs.getInt("SUP_ID");
		float price = srs.getFloat("PRICE");
		int sales = srs.getInt("SALES");
		int total = srs.getInt("TOTAL");
		System.out.print(name + "   " + id + "   " + price);
		System.out.println("   " + sales + "   " + total);
	    }
 
	    srs.close();
	    stmt.close();
	    con.close();
 
	} catch (SQLException ex) {
	    System.err.println("-----SQLException-----");
	    System.err.println("SQLState:  " + ex.getSQLState());
	    System.err.println("Message:  " + ex.getMessage());
	    System.err.println("Vendor:  " + ex.getErrorCode());
	}
    }
}

[edit] What Result You Can Get

Run the program, you will get:




[edit] Required External Library for this Java Example

In order to run this example program, one of the following libraries may be required:


[edit] How to Run this Java Example Program

We recommend running this Java example program with Eclipse.

For assistance in working with Eclipse, please see How to Run Java Program with Eclipse.

It's fairly easy.



[edit] Question & Answer

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