DataSource ds = DBCPDataSourceFactory.getDataSource(model);
Connection connection = null;
Statement statement = null;
ResultSet resultSet = null;
connection = ds.getConnection();
statement = connection.createStatement();
resultSet = statement.executeQuery(model.getQuery());

public class DBCPDataSourceFactory {
public static DataSource getDataSource(DBModel model) {
    String url = null;
    BasicDataSource ds = new BasicDataSource();
    if (model.getRdbms().toLowerCase().equals(DBConstants.POSTGRESQL)) {
        ds.setDriverClassName(DBConstants.POSTGRESQL_DRIVER);
        url = "jdbc:postgresql://" + model.getHost() + "/" + model.getDatabase();
        ds.setUrl(url);
    } else if (model.getRdbms().toLowerCase().equals(DBConstants.ORACLE)) {
        ds.setDriverClassName(DBConstants.ORACLE_DRIVER);
        url = "jdbc:oracle:thin:@"+model.getHost()+":"+model.getPort()+":"+model.getDatabase();
        ds.setUrl(url);
    } else if (model.getRdbms().toLowerCase().equals(DBConstants.SQL_SERVER)) {
        ds.setDriverClassName(DBConstants.SQL_SERVER_DRIVER);
        url = "jdbc:sqlserver://"+model.getHost()+":"+model.getPort()+";databaseName="+model.getDatabase();
        ds.setUrl(url);
    }
    ds.setUsername(model.getUsername());
    ds.setPassword(model.getPassword());
    return ds;
}}