Comparing A Time Value Against Database To Stop Repeat Entries - php

Question

I am inserting values into a database.
If the time the values were created is less than 24 hours then I insert like this,
$stmt = $con->prepare('
INSERT INTO taggedPlaces
(id, created_time, place_id, city, country, latitude, longitude, state, street, zip, name)
VALUES
(?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
');
foreach($graphObject['tagged_places']->data as $data) {
if (time() - strtotime($data->created_time) < 86400) {
$stmt->execute(array(
$data->id,
$data->created_time,
$data->place->id,
$data->place->location->city,
$data->place->location->country,
$data->place->location->latitude,
$data->place->location->longitude,
$data->place->location->state,
$data->place->location->street,
$data->place->location->zip,
$data->place->name
));
}
}
Everytime I return to the page it takes the same entries and continuously adds them to the database.
I would like to say something like
if $data->created_time == any created_time value in the DB then don't add this value,
as well as currently I am doing
if (time() - strtotime($data->created_time) < 86400)
to make sure it is not older then 24 hours.
How can I add this condition?

Answer 1

Option 1: (Recommeded)
Make id the primary key for your table, taggedPlaces:
ALTER TABLE taggedPlaces ADD PRIMARY KEY(id)
Then change your insert statement to use INSERT IGNORE which will skip duplicate inserts.
Option 2:
Make created_time a unique field in taggedPlaces:
ALTER TABLE taggedPlaces ADD UNIQUE(created_time);
Then, again, use INSERT IGNORE to skip duplicates.
Option 3: (Not recommeded, but will work)
Prior to running your insert, perform another query to check if $data->created_time is already in the table:
$check = $con->prepare('
SELECT id FROM taggedPlaces
WHERE created_time = ?
');
$check->execute(array($data->created_time));
if (count($check->fetchAll()) == 0) {
// No duplicates found. Proceed...
}