Php 活动记录在CodeIgniter中获取第二个表值

我只创建了一个简单的博客，但我无法从帖子中获得所需的输出，我只想使用第一个表中的userID从第二个表中获取firstname和lastname

controllers/posts.php：

<?php

class Posts extends CI_Controller {

    function __construct() {
        parent::__construct();
        $this->load->model('post');
    }

    function index() {
        $data['posts'] = $this->post->get_posts();
        $data['users'] = $this->post->get_users();
        $this->load->view('post_index', $data);
    }

    function post($postID) {
        $data['post'] = $this->post->get_post($postID);
        $this->load->view('post', $data);
    }

    function correct_permissions($required) {
        $user_type = $this->session->userdata('user_type');
        if ($required == "User") {
            if ($user_type) {
                return true;
            }
        } elseif ($required == "Blogger") {
            if ($user_type == "Blogger") {
                return true;
            }
        }
    }

    function deletepost($postID) {
        $user_type = $this->session->userdata('user_type');
        if ($user_type != 'Blogger') {
            echo "<script>alert:('Please log in to continue.');</script>";
            redirect(base_url());
        }
        $this->post->delete_post($postID);
        redirect(base_url() . 'posts');
    }

}

---

附言：我是一名初学者，对CodeIgniter还不熟悉。

好的。所以我从你的问题中得到的是，你有两个表，其中一个表中存储了用户ID，另一个表中存储了用户详细信息。所以试试这个，因为你需要在回显它之前获取行

echo $this->db->select('firstname','lastname')->from('users')->where('userID',$row['userID'])->get()->row();

上述代码也可以这样编写：

$this->db->select('firstname','lastname')->where('userID',$row['userID'])->get('users')->row();

---

如果您有任何疑问，请告诉我。

非常高兴您的帮助，但没有奏效，兄弟。。。。我也犯了同样的错误…：我想把这个

值转换成文字，它看起来像是最后添加的：2014-09-22 10:49:22。再次提供帮助将不胜感激：请将您的代码发布到fiddle，以便我可以更好地帮助您如何发布我的代码到fiddle，以及在哪里可以找到该小提琴？羞耻

<div class="panel">
<?php if (!isset($posts)) { ?>
    <p>There are currently no posts on my blog.</p>
    <?php
} else {
    foreach ($posts as $row) {
        ?>
        <div class="panel-heading">
            <h2 href="<?= base_url() ?>posts/post/<?= $row['postID'] ?>"><?= $row['title'] ?></h2>
        </div>
        <div class="panel-body">
            <p><?= substr(strip_tags($row['post']), 0, 200) . "..." ?></p>
            <br><br>
            <div class="panelver">
                <h6 href="<?= base_url() ?>posts/post/<?= $row['userID'] ?>">Posted by: 
                    <?php
                    if($row['userID'] == 0) {
                        echo "Someone";
                    } else {
                        echo $this->db->select('firstname','lastname')->from('users')->where('userID',$row['userID']);
                    }
                    ?></h6>
                <p href="<?= base_url() ?>posts/post/<?= $row['postID'] ?>">Added last: <?= $row['date_added'] ?></p>
            </div>
            <p><a href="<?= base_url() ?>posts/post/<?= $row['postID'] ?>">Read More</a> - - - <a href="<?= base_url() ?>edit/editpost/<?= $row['postID'] ?>">Edit</a> | <a href="<?= base_url() ?>posts/deletepost/<?= $row['postID'] ?>">Delete</a></p>
            <hr/>
        </div>
        <?php
    }
}
?>
</div>

Posted by:
A PHP Error was encountered

Severity: 4096

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

Filename: views/post_index.php

Line Number: 42


Added last: 2014-09-20 11:30:00

Read More - - - Edit | Delete

echo $this->db->select('firstname','lastname')->from('users')->where('userID',$row['userID'])->get()->row();

$this->db->select('firstname','lastname')->where('userID',$row['userID'])->get('users')->row();