edit column in pdo select [closed] - php

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I have a column that is in seconds and I need to format it in Minutes:seconds, I am thinking that I will need to loop through the fetched array but not quite sure on how to go about that.
$query = 'SELECT calldate,recordingfile,uniqueid,clid,did,lastapp,dst,disposition,duration FROM cdr';
$sql = $remotedbh->prepare($query);
$sql->execute();
$dblist = $sql->fetchAll(PDO::FETCH_ASSOC);
while($row -)
if($sql->rowCount() > 0){
header('Content-type: application/json');
echo json_encode($dblist);
}
else {
echo 0;
}
?>

Answer 1

I would suggest changing the value in the query itself. Here is an example
SELECT calldate,
recordingfile,
uniqueid,
clid,
did,
lastapp,
dst,
disposition,
duration,
CONCAT(FLOOR(duration/60),':',LPAD((duration % 60), 2, '0')) AS duration_in_mins_and_secs
FROM cdr
Here I am assuming duration is the field you want to modify. I am simply dividing the duration by 60 to get minute component and then concatenating the remainder to it.
If you need this data regularly (i.e. you are going to perform this query a lot), it would probably be best to actually store this calculated field in the records themselves so you don't need to make a calculation at all when querying the data. Simply make this calculation upon each record insert.

Answer 2

I suggest fetching one row at a time rather than fetching them all into an array:
while ($dbrow = $sql->fetch(PDO::FETCH_ASSOC)) {
// process current row
}
If you'd rather fetch them all into one array, you can use PHP's foreach:
$dblist = $sql->fetchAll(PDO::FETCH_ASSOC);
foreach ($dblist as $dbrow) {
// process current row
}

Answer 3

The following code will format the duration in M:S format:
while ($row = $sql->fetch(PDO::FETCH_ASSOC)) {
$dur = $row["duration"];
$min = $sec = 0;
if (floor($dur / 60) > 0) {
$min = floor($dur / 60);
$sec = $dur % 60;
}
else {
$sec = $dur;
}
$str = $min . ":" . $sec;
}
However, I recommend having your database format the output for you, as Mike Brant specifies in his answer.