如何从DB中获取codeigniter中的所有字母？ PHP，MySQL，CodeIgniter

Question

我用它来获取所有字母来创建字母列表： SELECT DISTINCT SUBSTRING(title, 1, 1) AS letter FROM games ORDER BY letter asc 一切还好。但后来我尝试将它传递给codeigniter，它失败了（试过）了几个变种：​​

$this->db->distinct();
$this->db->select("SUBSTRING(title,1,1) AS letter");
$this->db->order_by("letter", "asc");
$query = $this->db->get('games');

也是这个：

$this->db->query("SELECT DISTINCT SUBSTRING(title,1,1) AS letter ORDER BY letter");
$query = $this->db->get('games');

我一直得到错误号码：1064

您的SQL语法有错误;查看与您的MySQL服务器版本对应的手册，以便在第1行的“AS letter FROM（games）ORDER BY letter asc”附近使用正确的语法

SELECT DISTINCT SUBSTRING(title, `1`, `1)` AS letter FROM (`games`) ORDER BY `letter` asc

文件名：E：\ wamp \ www \ gamecenter \ system \ database \ DB_driver.php

行号：330

也许有人可以提供帮助？ ：（（

Answer 1

将第二个参数传递给select为FALSE

$this->db->select("SUBSTRING(title,1,1) AS letter", FALSE); //This way it will not put the ` characters.

Answer 2

$ result = $ this-＆gt; db-＆gt; query（'SELECT DISTINCT SUBSTRING（title，1,1）AS letter FROM（games）ORDER BY letter asc'） - ＆gt ;结果（）;

我认为它会帮助你。