Add überpowerful "query" filter, for SQL queries. fixes #2721

git-svn-id: http://svn.automattic.com/wordpress/branches/2.0@4620 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/wp-db.php

@@ -131,6 +131,11 @@ class wpdb {
 	//	Basic Query	- see docs for more detail
 
 	function query($query) {
+		// filter the query, if filters are available
+		// NOTE: some queries are made before the plugins have been loaded, and thus cannot be filtered with this method
+		if ( function_exists('apply_filters') )
+			$query = apply_filters('query', $query);
+
 		// initialise return
 		$return_val = 0;
 		$this->flush();