Create a class to connect to any database using jdbc

Question

I am trying to design a Java swing application. I want to experiment and use an MVC type of architecture whereby my UI is separated from the actual logic to access data and

Answer 1

Just create a separate class and delegate to him a getting of connection to database:

public class ConnectionManager {
    private static String url = "jdbc:mysql://localhost:3306/prototypeeop";    
    private static String driverName = "com.mysql.jdbc.Driver";   
    private static String username = "root";   
    private static String password = "triala";
    private static Connection con;
    private static String urlstring;

    public static Connection getConnection() {
        try {
            Class.forName(driverName);
            try {
                con = DriverManager.getConnection(urlstring, username, password);
            } catch (SQLException ex) {
                // log an exception. fro example:
                System.out.println("Failed to create the database connection."); 
            }
        } catch (ClassNotFoundException ex) {
            // log an exception. for example:
            System.out.println("Driver not found."); 
        }
        return con;
    }
}

Then get the connection in a code as follows:

private Connection con = null;
private Statement stmt = null;
private ResultSet rs = null;

con = ConnectionManager.getConnection();
stmt = con.createStatement();
rs = stmt.executeQuery(sql);

Answer 2

You can either use fancier stuff like Hibernate or if your database usage is simple then you can try Commons DbUtils

Ceremonial connection code

String db = "jdbc:h2:mem:;INIT=runscript from 'classpath:/prototypeeop.sql'"; 
//for H2 in-memory database:
Connection DriverManager.getConnection(db);

Remember the core classes and interfaces in Commons DbUtils are QueryRunner and ResultSetHandler.

Answer 3

You can try MySQL JDBC Utilities API for MySQL connectivity.

This API offers very cool features and also fulfill your requirement!

Answer 4

Two ways you can make it

1. Override determineCurrentLookupKey() method of Spring's AbstractRoutingDataSource class.

2. You can create a class which will return Connection based on system.