在codeigniter中执行无法一次一执行的多个查询 [英] Executing multiple queries in codeigniter that cannot be executed one by one

问题描述

我有一个事件"表.为简单起见，您可以想象它应该像一个分层类别.它使用嵌套集模型(感谢Mark Hillyer在 http://mikehillyer.com/articles/managing-hierarchical-data-in-mysql/)

I have an "event" table. For simplicity, you can imagine that it should be like a hierarchical category. It uses the nested set model (Thanks to Mark Hillyer for his post at http://mikehillyer.com/articles/managing-hierarchical-data-in-mysql/)

我的代码:

$query = 
"LOCK TABLE event WRITE;
SELECT @ParentRight := parent.rgt, @Level := parent.level FROM event AS parent WHERE parent.id = '{$data['parent_id']}';

UPDATE event SET rgt = rgt + 2 WHERE rgt > @ParentRight;
UPDATE event SET lft = lft + 2 WHERE lft > @ParentRight;

INSERT INTO event(lft, rgt, level) VALUES(@ParentRight, @ParentRight + 1, @Level);
UNLOCK TABLES;";

mysqli_multi_query($this->db->conn_id, $query);

$data['id'] = $this->db->insert_id();
return $this->db->update('event', $data);

然后，我将使用$this->db->update('event', $data)

$data是用户已填充的数组.

$data is an array that user has filled.

问题1:

我无法使用 $ this-> db-> query($ query); ;

无效的解决方案1:

I.使用 mysqli 数据库引擎.

I. Use mysqli db engine.

II. mysqli_multi_query($this->db->conn_id, $query);虽然我认为它可行，但是却出现以下错误:

II. mysqli_multi_query($this->db->conn_id, $query); While I thought it works, it is giving the following error:

Commands out of sync; you can’t run this command now.

问题2:

$this->db->insert_id()不起作用(返回0)

问题3:

$this->db->update('event', $data);错误: Commands out of sync; you can't run this command now

如何更正此代码才能正常工作?我甚至很乐意为第一个问题找到解决方案.

How can I correct this code to work? I'd be even happy to find a solution for the first problem.

推荐答案

也许使用事务?

$this->db->trans_start();
$this->db->query('AN SQL QUERY...');
$this->db->query('ANOTHER QUERY...');
$this->db->query('AND YET ANOTHER QUERY...');
$this->db->trans_complete(); 

https://www.codeigniter.com/user_guide/database/transactions.html

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