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Posted in : Java Magazine

how to sum 2 columns in a table and put the result in new coluumn. the o/p should be

col1 col2 col3 12 24 36 10 30 40 5 10 15


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March 1, 2011 at 1:39 PM

JDBC sum two columns and display the result in third column

import java.sql.*;
public class DatabaseExample
    public static void main(String[]args){
Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/test","root","root");
Statement st=con.createStatement();
Statement st1=con.createStatement();
ResultSet rs=st.executeQuery("select * from sum");
    int id=rs.getInt("id");
int sum=rs.getInt("col1")+rs.getInt("col2");
st1.executeUpdate("update sum set col3="+sum+" where id="+id+"");
Statement stmt=con.createStatement();
ResultSet rs1=stmt.executeQuery("select * from sum");
    System.out.println(rs1.getInt("col1")+"\t "+rs1.getInt("col2")+"\t "+rs1.getInt("col3"));
catch(Exception e){

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