function multiWhere($where_array = array())
 {
     if (!empty($where_array)) {
         foreach ($where_array as $k => $v) {
             if (!owa_lib::isEmpty($v)) {
                 if (empty($v['operator'])) {
                     $v['operator'] = '=';
                 }
                 $this->_sqlParams['where'][$k] = array('name' => $k, 'value' => $v['value'], 'operator' => $v['operator']);
             }
         }
     }
 }
 function setConstraint($name, $value, $operator = '')
 {
     if (empty($operator)) {
         $operator = '=';
     }
     if (!owa_lib::isEmpty($value)) {
         $this->params['constraints'][$name] = array('operator' => $operator, 'value' => $value, 'name' => $name);
     }
 }