Question

PHP:

$current = time();
$time_ago = $current - 45*60; // get the time 45 mts ago.

MySQL:

I have a table status which has a datetime column ‘modified’;

I am trying to query the table to get the rows that have a modified time lower than that of $time_ago;

My PHP Code:

$this->db->select("(SELECT UNIX_TIMESTAMP(status.modified) FROM status WHERE status_id = 0) AS modified_timestamp" , FALSE);
        $this->db->from('status');
        $this->db->where('status_id', 0);
        $this->db->where('modified_timestamp <', $time_ago);
        $this->db->limit(25);
        $q = $this->db->get();

Getting a db error:

Unknown column ‘modified_timestamp’ in ‘where clause’

SELECT 
    (SELECT UNIX_TIMESTAMP(status.modified) FROM status WHERE status_id = 0) AS modified_timestamp 
    FROM (status) WHERE `status_id` = 0 AND `modified_timestamp` < 1343542758 LIMIT 25

Answer 1

You realize you can use UNIX_TIMESTAMP() in a where clause, right?

$this->db->select("UNIX_TIMESTAMP(modified)" , FALSE);
$this->db->from('status');
$this->db->where('status_id', 0);
$this->db->where('UNIX_TIMESTAMP(modified) <', $time_ago);
$this->db->limit(25);
$q = $this->db->get();

Note: May not work as-is, I haven’t used this particular DB API, but you get the idea.