jdbc operation mysql database instance

import .*;
import ;
import ;
import ;
import ;
class conn{
 String url="jdbc:mysql://127.0.0.1/nariData";
 final String user = "nari";
 final String pass = "nariacc";
 Connection conn = null;
 Statement st = null;
 ResultSet rs = null;
 conn(){
  try{
   ("");
  }catch(Exception e){
   ();
  }
  try{
   ("in DBManager");
   conn = (url, user, pass);
   String sql = "create table test (id int, uid int)";
   st = ();
   (sql);
  }catch(Exception e){
   ();
  }
 }
 void insert(){
  try{
   for(int i=0;i<10;i++){
    String sql = "insert into test values("+i+","+i+")";
    (sql);
   }
  }catch(Exception e){
   ();
  }
 }
 void query(){
  try{
   String sql = "select * from test ";
   rs = (sql);
   while(()){
    ("res1: "+(1)+" res2: "+(2)+"\n");
   }
  }catch(Exception e){
   ();
  }
 }
 void close(){
  try{
   ();
   ();
   ();
  }catch(Exception e){
   ();
  }
 }
}
public class mysqltest {
 public static void main(String[] args) {
  // TODO Auto-generated method stub
  conn a1 = new conn();
  ();
  ();
  ();
 }
}