PHP代码点火器数据库错误

不能找出什么是错在这里：PHP代码点火器数据库错误

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 
}

得到这个错误：

 
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

我已经用类似的代码的另一个项目，它能正常工作。使用MAMP在本地服务器上运行。感谢您的任何帮助，您可以提供。

来源

2011-05-27 mheavers