类 stdClass 的对象无法转换为字符串（错误号：1064）

Question

我不断收到此错误（检查问题底部的确切错误）我一次又一次地检查，但找不到问题所在。似乎没事。在 insert_batch 上它工作正常，但在 update_batch 上我收到此错误。这是我当前的代码

Codeigniter 模型： 这是正确获取数据的模型

    function get_seeds($tournament_id) {
        $this->db->where('tournament_id', $tournament_id);
        $result = $this->db->get('tournament_seed');
        return $result->result();
    }

Codeigniter 控制器： 这是我的控制器，我在其中检查是否有种子行。如果是，则更新，否则插入。

    $check_seeds = (object)$this->tournament_model->get_seeds($tournament_id);
    if ($_POST) {
        foreach ($check_seeds as $key => $value) {
            if(!empty($key) && !empty($value)) {
                $seeded[] = array(
                    'id' => $value->id,
                    'tournament_id' => $tournament_id,
                    'stage_id' => $stage_id,
                    'seed_id' => $value,
                    'team_name' => $key,
                );
                $this->db->update_batch('tournament_seed', $seeded, 'id');
                redirect('organizer/tournaments);
            } else {
                //something
            }
        }
    }

Print_r($check_seeds)

    stdClass Object
    (
        [0] => stdClass Object
        (
            [id] => 3
            [tournament_id] => 713161746
            [stage_id] => 3
            [seed_id] => 1
            [team_name] => -V-ATTAX
        )

        [1] => stdClass Object
        (
            [id] => 4
            [tournament_id] => 713161746
            [stage_id] => 3
            [seed_id] => 2
            [team_name] => NIP
        )

        [2] => stdClass Object
        (
            [id] => 5
            [tournament_id] => 713161746
            [stage_id] => 3
            [seed_id] => 3
            [team_name] => fnatic
        )
    )

错误

    A PHP Error was encountered
    Severity: 4096

    Message: Object of class stdClass could not be converted to string

    Filename: database/DB_query_builder.php

    Line Number: 1970

    Backtrace:

    File: E:\xampp\htdocs\hltv\application\controllers\organizer\Tournaments.php
    Line: 1065
    Function: update_batch

    File: E:\xampp\htdocs\hltv\index.php
    Line: 315
    Function: require_once


    Error Number: 1064

    You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'ELSE `seed_id` END, `team_name` = CASE WHEN `id` = '4' THEN '1' ELSE `team_name' at line 7

    UPDATE `tournament_seed` SET `tournament_id` = CASE WHEN `id` = '4' THEN '713161746' ELSE `tournament_id` END, `stage_id` = CASE WHEN `id` = '4' THEN '3' ELSE `stage_id` END, `seed_id` = CASE WHEN `id` = '4' THEN ELSE `seed_id` END, `team_name` = CASE WHEN `id` = '4' THEN '1' ELSE `team_name` END WHERE `id` IN('4')

    Filename: E:/xampp/htdocs/hltv/system/database/DB_driver.php

    Line Number: 691

Answer 1

您正在尝试对刚刚从数据库表 tournament_seed 查询的相同数据使用 update_batch()，但您没有使用新的 $_POST 要更新的数据。

您还在循环中使用 update_batch()，这是错误的。循环只是创建要更新的数组，然后在循环之外 update_batch()

使用以下内容创建一个数组，稍后可以将其用于update_batch()，类似于：

$seeded=array();
$sd=array();        
foreach($_POST['your_newly_posted_seeds'] as $key=>$value){
    $sd['id']=$value->id;
    $sd['tournament_id']=$tournament_id;
    //...
    array_push($seeded, $sd);
}

$this->db->update_batch('tournament_seed', $seeded, 'id');

update_batch() from the docs，向下滚动或搜索：$this->db->update_batch() 因为它没有书签。