如何在Codeigniter中正确使用别名

这是我的密码：

$this->db->select('course_name AS Course Name,course_desc AS Course Description,display_public AS Display Status',FALSE);
$this->db->from('courses');
$this->db->where('tennant_id',$tennant_id);
$this->db->order_by('course_name','ASC');
$query = $this->db->get();

我犯了一个错误：

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 'Name, course_desc AS Course Description, display_public AS Display Status FROM (' at line 1

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 'Name, course_desc AS Course Description, display_public AS Display Status FROM (' at line 1

SELECT course_name AS Course Name, 
       course_desc AS Course Description, 
       display_public AS Display Status 
FROM (`courses`) WHERE `tennant_id` = 'elicuarto@apploma.com' 
ORDER    BY `course_name` ASC

Filename: C:\wamp\www\coursebooking\system\database\DB_driver.php

Line Number: 330

我犯了一个错误：

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 'Name, course_desc AS Course Description, display_public AS Display Status FROM (' at line 1

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 'Name, course_desc AS Course Description, display_public AS Display Status FROM (' at line 1

SELECT course_name AS Course Name, 
       course_desc AS Course Description, 
       display_public AS Display Status 
FROM (`courses`) WHERE `tennant_id` = 'elicuarto@apploma.com' 
ORDER    BY `course_name` ASC

Filename: C:\wamp\www\coursebooking\system\database\DB_driver.php

Line Number: 330

试一试

正是你的别名中的空格让你烦恼

更新

我不知道你为什么要这么做，但我看不到任何东西阻止你写作

$this->db->select("course_name AS `{$variable}`", FALSE);

（为了简单起见，仅显示一个字段）

更新2

应该是标准的字符串转换，所以我不知道为什么它不适合你。。总是有分裂的字符串

$this->db->select('course_name AS `' . $variable . '`', FALSE);

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还有一件事，是否可以将变量改为别名？它不起作用。它将只打印放在大括号中的变量名。是否缺少任何内容？是否使用双引号（“）作为字符串？使用单引号（”）将不允许变量替换。是的。我的操作与您完全相同，但打印的是变量名。是否尝试按照更新2拆分字符串？如果这也不起作用，我真的不知道