How to insert on first time and update for the second time - mysql

Question

I want to insert the row if it's a first entry of the day else I want to update the row..How can I do that..Currently I had done for update and don't know how to do it for insert..Please help me to achieve this..
This is my controller code:
$startdate = $this->input->post('TDate');
$date = str_replace('/', '-', $startdate);
$newDate = date("Y-m-d", strtotime($date));
$data1 = array(
'tdate'=>$newDate,
'total_credit'=>$total_credit['amount'],
'total_debit'=>$total_debit['amount'],
);
$this->db->where('tdate',$newDate);
$this->db->update('daytot',$data1);

Answer 1

Try below one
$newDate = date("Y-m-d", strtotime($this->input->post('TDate')));
$data1 = array(
'tdate' => $newDate,
'total_credit' => $total_credit['amount'],
'total_debit' => $total_debit['amount'],
);
//Check record is exist for the request date
$objQuery = $this->db->get_where('daytot', array('tdate' => $newDate));
if ($objQuery->num_rows() > 0) { //UPDATE
$this->db->where('tdate', $newDate);
$this->db->update('daytot', $data1);
}
else { //INSERT
$this->db->insert('daytot', $data1);
}
Hope this will work :)

Answer 2

One solution to your problem, which you may find acceptable, would be to just always insert your transactional data as it comes along. That is, the first record and every subsequent record would come into the database as a separate insert. Then, if you needed to do any reporting, e.g. by hour or day, you could simply hit the table of transactions and aggregate.
The problem you are trying to solve, namely conditionally doing an insert at the start of a day, is troublesome, because in addition to what you already pointed out, you might also have to worry about multi nodes in your application trying to do this at the same time.