How to create multiple database connections for different databases in java

Question

I have an application which uses four databases in different geographical locations. All the databases contains same tables and only the database name is different according

Answer 1

is very easy :)

1.Create a Data Source to try connection to DB

public DataSource getDataSource(String db) throws Exception {
DataSource dt = null;
InitialContext ic = null;
try {
    if(db.trim().equals("you_database_name")) {
        dt = (DataSource)ic.lookup("jdbc/connection_name");
    } else if(db.trim().equals("you_database_name")) {
        dt = (DataSource) ic.lookup("jdbc/connection_name");
    }
    return dt;
} catch(NamingException n) {
    throw new Exception("Err getDataSource (ServiceLocator) NamingException - " + n.getMessage());
}

2.Create a class DataBase, remember close all connection in this point.

public class DataBases {
public YouNameDataSourceClass dataSrc;
public DataBases() throws Exception {
   super();
   dataSrc = new YouNameDataSourceClass.getDataSource();
}
public Connection getConnectionAS400() throws Exception {
    return locator.getDataSource("you_database_name").getConnection();
}

public Connection getConnectionOracle() throws Exception {
    return locator.getDataSource("you_database_name").getConnection();
}

public Connection getConnectionSQLServer() throws Exception {
    return locator.getDataSource("you_database_name").getConnection();
}
}

Good look.