public function executeSqlStatement($sql_start, $sql_end)
 {
     $this->start_time = time();
     $this->operation_description = 'SQL Statement: "' . stripslashes($sql_start . ' ' . $this->app_description . '.' . $sql_end . '"');
     foreach ($this->app_array as $app) {
         $sql = $this->constructSqlStatement($app, $sql_start, $sql_end);
         $result = $app->gcQuery($sql, array(), false, true);
         if ($result == -1) {
             $this->failure_list[] = $app->getShortName();
         } else {
             GcrDatabaseAccessPostgres::logQueryResult($sql, $result);
         }
     }
     $this->close();
 }