Question

我有一个“事件”表。为简单起见，您可以想象它应该像层次结构类别。它使用嵌套集模型（感谢Mark Hillyer在http://mikehillyer.com/articles/managing-hierarchical-data-in-mysql/发帖）

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);

之后我将用$this->db->update('event', $data)

更新最后插入的对象

$data是用户填写的数组。

问题1：

我无法使用 $ this-＆gt; db-＆gt;查询（$ query）执行 $ query ; ;

无效的解决方案1：

予。使用 mysqli 数据库引擎。

II。 mysqli_multi_query($this->db->conn_id, $query);虽然我认为它有效，但却出现以下错误：

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？我很乐意为第一个问题找到解决方案。

Answer 1

也许使用交易？

$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

Answer 2

为什么不编写一个存储过程来执行上面列出的所有SQL，将查询中的变量作为参数。然后只需将存储过程作为单个SQL语句调用;

$sql = "CALL some_sp($param1, $param2...etc)";

Answer 3

MySQL中的用户定义变量是特定于连接的，并且一直保持到关闭连接为止。

$queryList = array(
    "LOCK TABLE event WRITE",
    "SELECT @ParentRight := parent.rgt, @Level := parent.level FROM event AS parent WHERE parent.id = '{$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)",
    false, // special value
    "UNLOCK TABLES",
) 

foreach ($queryList as $query) if ($query) {
    mysqli_query($this->db->conn_id, $query);
    // you should have error-checking here
} else {
    // we have the special value
    $data['id'] = $this->db->insert_id();
}

Answer 4

$query1 = $this->db->query("SELECT * FROM `Wo_Products` WHERE `boost_plan`=1 AND `tamatar`=1 AND`active`=1 ORDER BY rand()  LIMIT 3");

$query2 = $this->db->query("SELECT * FROM `Wo_Products` WHERE `boost_plan`=2 AND `tamatar`=1 AND`active`=1 ORDER BY rand()  LIMIT 3");

$query3 = $this->db->query("SELECT * FROM `Wo_Products` WHERE `boost_plan` NOT IN (0,1) AND `tamatar`=1 AND`active`=1 ORDER BY rand()  LIMIT 6");

    $result1 = $query1->result();
    $result2 = $query2->result();
    $result3 = $query3->result();
    return array_merge($result1, $result2, $result3);

Answer 5

您可以简单地使用以下内容：

 print_r($this->db->query("YOUR query NO 1") ? 'Success Q1' : $this->db->error());
 print_r($this->db->query("YOUR query NO 2") ? 'Success Q2' : $this->db->error());
 print_r($this->db->query("YOUR query NO 3") ? 'Success Q3' : $this->db->error());

在codeigniter中执行多个查询，这些查询无法逐个执行

5 个答案: