Insert the newset value in a table and drop the old ones

I have a method which saves somes records for a machine in a table. However, I may insert by accident multiple times the records for the same machine in a day, so I want for this day to save the newest insert and drop the old ones. I thought one solution:

String sq = "SELECT date, idMachine "
          + "FROM MACHINES_RECORDS WHERE date = ? AND idMachine = ?";

 try {       
        Class.forName(typeDB);
        c = DriverManager.getConnection(path);            
        stm = c.prepareStatement(sq);  
        ResultSet rs = stm.executeQuery();

        if (rs.next()) {                
           do {
                 //call an another method to drop this value
               } while(rs.next());
         }else {
               //call an another method to insert this value
         }       
        }catch (SQLException e) {
            System.out.println(e.getMessage());
        } finally {
            if (stm != null)
                stm.close();
            if (c != null)
        c.close();
  }

Is there any better/smartest solution from this, so I can make all theses actions in the same method?