Question

I’m trying to collect a sum of numbers from multiple rows like so:
(Simplified version to isolate the problem)

"SELECT sum( field_voeding_vlees_value )
FROM content_field_date
LEFT JOIN content_type_expense ON content_field_date.nid = content_type_expense.nid
WHERE addtime( str_to_date( field_date_value, '%Y-%m-%dT%k:%i:%s' ) , '01:00:00' ) >= '2011-11-01'
AND addtime( str_to_date( field_date_value, '%Y-%m-%dT%k:%i:%s' ) , '01:00:00' ) <= '2011-11-31'"

This query works perfectly in phpMyAdmin, returns something like:

sum(field_voeding_vlees_value)

115.12

However, when I run it in a php-script(in a custom module in drupal) with this code:

$result_query_totals = db_query("SELECT sum( field_voeding_vlees_value )
FROM content_field_date
LEFT JOIN content_type_expense ON content_field_date.nid = content_type_expense.nid
WHERE addtime( str_to_date( field_date_value, '%Y-%m-%dT%k:%i:%s' ) , '01:00:00' ) >= '2011-11-01'
AND addtime( str_to_date( field_date_value, '%Y-%m-%dT%k:%i:%s' ) , '01:00:00' ) <= '2011-11-31'");

$row = mysqli_fetch_object($result_query_totals);
print_r($row);

This outputs:

stdClass Object
(
    [sum( field_voeding_vlees_value )] => 
)

Also tried selecting normal values, problem persists, however if I remove the WHERE part which filters on the dates(strings transformed to dates tbh) the query works fine?

Thoughts?

Answer 1

You need to escape the % marks in your query, db_query() uses % as a placeholder marker and performs a string replacement on things like %s, %d, %b, etc. They’re escaped using a double percent (%%):

$result_query_totals = db_query("
  SELECT sum( field_voeding_vlees_value )
  FROM content_field_date
  LEFT JOIN content_type_expense ON content_field_date.nid = content_type_expense.nid
  WHERE addtime( str_to_date( field_date_value, '%%Y-%%m-%%dT%%k:%%i:%%s' ) , '01:00:00' ) >= '2011-11-01'
  AND addtime( str_to_date( field_date_value, '%%Y-%%m-%%dT%%k:%%i:%%s' ) , '01:00:00' ) <= '2011-11-31'");