jdbc operates on mysql database instances

This article illustrates how jdbc operates on mysql databases. Share with you for your reference. The details are as follows:

import java.sql.*;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
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{
   Class.forName("com.mysql.jdbc.Driver");
  }catch(Exception e){
   e.printStackTrace();
  }
  try{
   System.out.println("in DBManager");
   conn = DriverManager.getConnection(url, user, pass);
   String sql = "create table test (id int, uid int)";
   st = conn.createStatement();
   st.execute(sql);
  }catch(Exception e){
   e.printStackTrace();
  }
 }
 void insert(){
  try{
   for(int i=0;i<10;i++){
    String sql = "insert into test values("+i+","+i+")";
    st.execute(sql);
   }
  }catch(Exception e){
   e.printStackTrace();
  }
 }
 void query(){
  try{
   String sql = "select * from test ";
   rs = st.executeQuery(sql);
   while(rs.next()){
    System.out.print("res1: "+rs.getInt(1)+" res2: "+rs.getInt(2)+"\n");
   }
  }catch(Exception e){
   e.printStackTrace();
  }
 }
 void close(){
  try{
   rs.close();
   st.close();
   conn.close();
  }catch(Exception e){
   e.printStackTrace();
  }
 }
}
public class mysqltest {
 public static void main(String[] args) {
  // TODO Auto-generated method stub
  conn a1 = new conn();
  a1.insert();
  a1.query();
  a1.close();
 }
}

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