fix a bug with multiple DB support

git-svn-id: http://xe-core.googlecode.com/svn/branches/1.5.0@8899 201d5d3c-b55e-5fd7-737f-ddc643e51545

classes/db/DB.class.php

@@ -399,7 +399,7 @@
                 case 'select' :
                         $arg_columns = is_array($arg_columns)?$arg_columns:array();
                         $output->setColumnList($arg_columns);
-                        $connection = $this->_getConnection('slave');
+                        $connection = $this->_getConnection($database_type);
                         $output = $this->_executeSelectAct($output, $connection);
                     break;
             }