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    - Patch #13581 by Steven: Db_query() allows a variable amount of parameters so... · 29337ad8
    Dries authored
    - Patch #13581 by Steven: Db_query() allows a variable amount of parameters so you can pass the query arguments in. There is however an alternative syntax: instead of passing the query arguments as function arguments, you can also pass a single array with the query arguments in it. For example the following two statements are equivalent:
    
    db_query($query, $a, $b, $c);
    db_query($query, array($a, $b, $c));
    
    This usage is particularly interesting when the query is constructed dynamically, and the amount of arguments to pass varies. In that case we use the second method to avoid using call_user_func_array(). This behaviour is not documented explicitly, but it is used in several places.
    
    However, db_query_range() and pager_query() do not support this syntax properly, which means there are several pieces of code which still revert to the ugly call_user_func_array() call.
    
    This patch updates db_query_range() and pager_query() so they support the array-passing method. I also added documentation about this method to each of the db functions.
    
    I also cleaned up the code for db_query (it was weird and hard to understand) and moved db_query() and db_queryd() from database.xxxxx.inc to database.inc: it was the same between both mysql and pgsql, as it doesn't do anything database specific. It just prefixes the tables and inserts the arguments. The actual db query is performed in _db_query(), which is still in database.xxxxx.inc.
    
    Finally, I updated several places with the new syntax, and the code is a lot cleaner. For example:
    - array_unshift($params, "SELECT u.* FROM {users} u WHERE $query u.status < 3");
    - $params[] = 0;
    - $params[] = 1;
    - $result = call_user_func_array('db_query_range', $params);
    + $result = db_query_range("SELECT u.* FROM {users} u WHERE $query u.status < 3", $params, 0, 1);
    
    and
    
    - return call_user_func_array('db_query_range', array_merge(array($query), $args, array((int)$pager_from_array[$element], (int)$limit)));
    + return db_query_range($query, $args, (int)$pager_from_array[$element], (int)$limit);
    
    I've tested it on mysql. I didn't alter the actual db behaviour, so pgsql should be okay too.
    
    This patch is important because many people avoid the call_user_func_array() method and put data directly into the db query.  This is very, very bad because the database prefix will be applied to it, and strip out braces. It's also generally bad form as you have to call check_query() yourself.  With the new, documented syntax, there is no more excuse to put data directly in the query.
    29337ad8
pager.inc 13.1 KB