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php - 尝试从 2 个表 codeigniter 获取数据时出错

转载 作者：行者123 更新时间：2023-11-29 19:09:10 26 4
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我必须从 2 个表中获取数据。我的表是“Study”、“Users”和“Subjects”

"Study" includes:(id, user_id[is the foreign key to the column "id" of the table "Users"], subject_id[is the foreign key to the column "id" of the table "Subjects"], grade, date)

"Users" includes:(id,username,name,lastname,password,type,status,date)

"Subjects" includes:(id, career_id, name, description, hours)

我想在最后得到这样的东西:

enter image description here

我收到此错误:

enter image description here

enter image description here

enter image description here

这是我的代码:我的 View 文件(“home”):

    <html>

    <head>
        


    </head>

<body>

    <div class="container"> 
    <div class="row">
    <div class="col-md-12">

        <h2 align="center">TABLE:Study</h2>
        
        <input id="busqueda_tabla" type="text">
            <table class="table table-hover" align="center" border="1" cellspacing="0" cellpadding="0" width="700" id="tabla_busqueda">
                <thead>
                    <th>id</th>
                    <th>User</th>
                    <th>Subject</th>
                    <th>Grade</th>
                    <th>Date</th>
                    <th>Action</th>
                </thead>

<tbody>
    <?php

    if (count($records) > 0 && $records != false) {
        foreach($records as $record) {
            
            echo "<tr>
                      <td>".$record['id']."</td>
                      <td>".$record['user']."</td>
                      <td>".$record['subject']."</td>
                      <td>".$record['grade']."</td>
                      <td>".$record['date']."</td>
                      <td align='center'>
                         
                         <button type='button' class='btn btn-primary'>EDITAR</button></a> |
                    
                         <button type='button' class='btn btn-danger'>BORRAR</button></a>

                  </tr>";
        }

       }
    ?>

</tbody>

    </table>

        </div>
        </div>
        </div>

</body>
</html>

这是我的 Controller 文件(“Home”):

    <?php

    class Home extends CI_Controller{

         public function __construct(){
             parent::__construct();

             $this->load->model("Crudmodel");

        }


        public function index(){

    # get all data in Study table
    $selectStudys = $this->Crudmodel->selectStudys();

    foreach ($selectStudys as $key => $study) 
    {
        # get UserNames
        $user = $this->Crudmodel->getName($study['user_id']);

        #get Subject Names
        $subject = $this->Crudmodel->getSubName($study['subject_id']);


        #append both NEW VALUES to same array


        $data[$key]['user_id'] = $user[0]['username'];
        $data[$key]['subject_id'] = $subject[0]['name'];

    }


    $data['records'] = $selectStudys;
    $this->load->view('home', $data);

}



   }
    
?>

还有我的模型文件(“Crudmodel”):

  <?php

    class Crudmodel extends CI_Model{

        public function __construct(){
         parent::__construct();

         $this->load->database();

        }


        function selectStudys()
{
    $query= $this->db->query("SELECT * FROM Study");
    $result = $query->result_array();
    return $result;
}

function getName($name)
{
    $query= $this->db->query("SELECT username FROM Users WHERE id = $name ");
    $result = $query->result_array();
    return $result;
}

function getSubName($subject)
{
    $query= $this->db->query("SELECT name FROM Subjects WHERE id = $subject ");
    $result = $query->result_array();
    return $result;
}








}
?>

希望你能帮助我:/

最佳答案

我将您的查询更改为加入查询，只需将您的代码更改为下面

public function index(){

    # get all data in Study table

    $query = $this->db->query("SELECT sd.user_id as id,sd.grade as grade,sd.date as date,sd.subject_id as subject,ur.username as user FROM Study as sd,Users as ur,Subjects as sb WHERE ur.id=sd.user_id and sb.id=sd.subject_id");

    $result = $query->result_array();

    $data['records'] = $result;

    $this->load->view('home', $data);

}

现在运行代码

关于php - 尝试从 2 个表 codeigniter 获取数据时出错，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/43233409/

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