PHP代碼點火器數據庫錯誤

不能找出什麼是錯在這裏：PHP代碼點火器數據庫錯誤

class Model_form extends CI_Model 
{ 
    function __construct() 
    { 
     // Call the Model constructor 
     parent::__construct(); 
    } 

    function add_tree() 
    { 
    $v_treename = $this->input->post('f_treename'); 
    $v_treedesc = $this->input->post('f_treedesc'); 
    $v_treeid = $v_treename; 
    $this->db->query("INSERT INTO trees (index, tree_name, tree_desc, tree_id) VALUES (NULL, '$v_treename', '$v_treedesc', '$v_treeid') "); //PROBLEM OCCURS HERE 
}

得到這個錯誤：

 
A Database Error Occurred 
Error Number: 1064 

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'index, tree_name, tree_desc, tree_id) VALUES (NULL, 'TEST', 'TEST', 'TEST')' at line 1

我已經用類似的代碼的另一個項目，它能正常工作。使用MAMP在本地服務器上運行。感謝您的任何幫助，您可以提供。

來源

2011-05-27 mheavers