Bug 1717 fixed : SQLite: access failure on Admin > Tools > History

hour function doesn't exists
Merge from trunk.

git-svn-id: http://piwigo.org/svn/branches/2.1@6464 68402e56-0260-453c-a942-63ccdbb3a9ee

include/dblayer/functions_sqlite.inc.php

@@ -55,6 +55,7 @@ function pwg_db_connect($host, $user, $password, $database)
   }
 
   $link->createFunction('now', 'pwg_now', 0);
+  $link->createFunction('hour', 'pwg_hour', 1);
   $link->createFunction('unix_timestamp', 'pwg_unix_timestamp', 0);
   $link->createFunction('md5', 'md5', 1);
   $link->createFunction('if', 'pwg_if', 3);
@@ -582,6 +583,11 @@ function pwg_now()
   return date('Y-m-d H:i:s');
 }
 
+function pwg_hour($datetime)
+{
+  return strftime('%H', $datetime);
+}
+
 function pwg_unix_timestamp()
 {
   return time();