从数据库选择带日期时间

Question

I have a problem with my select : I have a form with 2 text boxes : date_min and date_max. This dates come in controller :

2015-05-15

Now in database my dates : c_win like this :

2015-08-20 21:20:20

In the query I do :

if ($date_min != '' && $date_max != ''){
        $aFilter = ' AND c_win > '.$date_min.' AND c_ig.date_gain < '.$date_max;
    }

But I think I need to reface the dates. Help me please!! Thx in advance

Answer 1

change the query like

 $aFilter = ' AND date(c_win) > '.$date_min.' AND date(c_ig.date_gain) < '.$date_max;

date function return only date like '2015-08-20' from '2015-08-20 21:20:20'

i hope this is working for you.

Answer 2

Try using DATE() :

if ($date_min != '' && $date_max != ''){
    $aFilter = ' AND DATE(c_win) > "' . $date_min . '" AND DATE(c_ig.date_gain) < "' . $date_max . '"';
}

Answer 3

您需要在日期前后加引号

$aFilter = ' AND c_win > "'.$date_min.'" AND c_ig.date_gain < "'.$date_max.'"';

Answer 4

Don't wrap the column in DATE() as the optimizer can't use an index on the column.. plus I'd be binding in variables using PDO or mysqli rather than concatting them..

When I have date comparisons in my code with date inputs, I almost always use:

SELECT ...
  FROM table t
 WHERE t.time >= :min_date
   AND t.time <  :max_date + INTERVAL 1 DAY

Which exactly covers all the times between the dates without breaking the index. It also assumes that the dates provided are inclusive.. which is logical for a UI.

In your case this would be:

$aFilter = ' AND c_win >= "'.$date_min.'" AND c_ig.date_gain < "'.$date_max.'" + INTERVAL 1 DAY';

BONUS INFO

If you are wondering why your query ran but didn't give the correct results..

AND c.win > 2008-05-13 AND c_ig.date_gain < 2015-05-05 

without quotes evaluates as integers to:

AND c.win > 1990 AND c_ig.date_gain < 2005

Which is then implicitly converted to:

AND c.win > "1990-01-01 00:00:00" AND c_ig.date_gain < "2005-01-01 00:00:00"

Another good reason not to concatenate query strings.