JDBC

           sql=null;

           con=null;

           st=null;

           rs=null;

           }

     

      public void insert(){

          

           sql="insert into yuchen_user (id,name) values(";

           sql+="4,'zhouwu')";

           System.out.println(sql);

          

           try{

                

           con=JdbcUtil.getConnection();

           st=con.createStatement();

           st.executeUpdate(sql);

          

           }catch(Exception e){

                

                 e.printStackTrace();

                

           }finally{

                

                 JdbcUtil.close(con,st);

                

                 }

          

           }

          

          

      public void delete(){

          

           sql="delete from yuchen_user where id=2";

           System.out.println(sql);