它的工作原理与codeigniter的规则相同。
function example_set_rules() {
$crud = new grocery_CRUD();
$crud->set_table('products');
$crud->columns('productName','buyPrice');
$crud->set_rules('buyPrice','buy Price','numeric');
$crud->set_rules('quantityInStock','Quantity In Stock','integer');
$output = $crud->render();
$this->_example_output($output);
}