笨2.1 - MySQL的CONCAT（追加字符串）

Question

我有PHP代码：

$query = 'UPDATE `user_vote` SET `container` = CONCAT(`container`, ' ; 
$query .= ",$glas"; 
$query .= ') WHERE `user_id` = ' . $id_u; 
$this->db->query($query); 

当我运行这段代码，我得到了以下错误：

Error Number: 1054

Unknown column ',iljadu' in 'field list'

UPDATE user_vote SET container = CONCAT(container , ,iljadu) WHERE user_id = 4

有什么不对查询？

Answer 1

你缺少你周围的变量报价为concat()

$query = 'UPDATE `user_vote` SET `container` = CONCAT(`container`, ' ; 
$query .= ",'$glas'"; 
$query .= ') WHERE `user_id` = ' . $id_u; 
$this->db->query($query); 

Answer 2

$query .= ",$glas"; 

应该

$query .= "$glas";