Java Examples - Update Table Contents

Problem Description:

How to update(delete, insert or update) contents of a table using JDBC connection?

Solution:

Following method uses update, delete & insert SQL commands to edit or delete row contents.

import java.sql.*;

public class updateTable {
   public static void main(String[] args) {
      try {
         Class.forName("org.apache.derby.jdbc.ClientDriver");
      }
      catch(ClassNotFoundException e) {
         System.out.println("Class not found "+ e);
      }
      try {
         Connection con = DriverManager.getConnection
         ("jdbc:derby://localhost:1527/testDb","username",
         "password");
         Statement stmt = con.createStatement();
         String query1="update emp set name='ravi' where id=2";
         String query2 = "delete  from emp where id=1";
         String query3 = "insert into emp values
         (1,'ronak','manager')";
         stmt.execute(query1);
         stmt.execute(query2);
         stmt.execute(query3);
         ResultSet rs = stmt.executeQuery("SELECT * FROM emp");
         System.out.println("id  name    job");
         while (rs.next()) {
            int id = rs.getInt("id");
            String name = rs.getString("name");
            String job = rs.getString("job");
            System.out.println(id+"   "+name+"    "+job);
         }
      }
      catch(SQLException e){
         System.out.println("SQL exception occured" + e);
      }
   }
}

Result:

The above code sample will produce the following result.The result may vary.

id  name    job
2   ravi    trainee
1   ronak    manager