Class.forName( "com.mysql.jdbc.Driver" ).newInstance();
Connection conn = DriverManager.getConnection( ConstantsDB."jdbc:mysql://xxxxcharacterEncoding=utf8" , "xxx" , "xxx" );
Statement stmt = conn.createStatement();ResultSet res = stmt.executeQuery( "select id from xxxx limit 1" );
while( res.next() )
{
      //....
}