尝试使用 codeigniter 获取数据时出错

Question

我得到了 3 table；我的 table 是“cursadas”、“usuarios”和“materias”

"cursadas" includes:(id, user_id[is the foreign key to the column "id" of the table "usuarios"], subject_id[is the foreign key to the column "id" of the table "materias"], grade, date)

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

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

这是我最后的table“cursadas”（数据来自tables“materias”和“usuarios”）

看一看，我需要这样的东西：

我收到这个错误：

我认为我的查询有误，我不知道我应该怎么做才能完成这项工作：S

这是我的代码：我的视图文件（“usuario”）：

            <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>
                </thead>


<tbody>
    <?php
 
    if (count($records) > 0 && $records != false) {
        foreach($records as $record) {
 
            echo "<tr>
                      <td>".$record['id']."</td>
                      <td>".$record['user']."</td>
                      <td>".$record['name']."</td>
                      <td>".$record['grade']."</td>
                      <td>".$record['date']."</td>
                  </tr>";
        }
 
       }
    ?>
 
</tbody>

</body>
</html>

我的控制器文件（“登录”）：

    <?php

        Class Login extends CI_Controller{


        public function index(){
 

           $this->load->view('login_form');


        }

 public function do_login()
        {
         // load the form_validation library
         $this->load->library('form_validation');

         $this->form_validation->set_rules('usuario', 'Username', 'trim|required|min_length[3]|alpha_numeric');
         $this->form_validation->set_rules('contrasena', 'Password', 'trim|required|min_length[6]');

           // if there is errors
         if ($this->form_validation->run() == FALSE) { 
            // this will load your form with the errors
        
               $this->load->view('login_form'); 

         } else {
           // if no errors we will hit the database
            $user=$this->input->post('usuario', true);
            $pass=$this->input->post('contrasena', true);
            $cek = $this->m_login->proceso_login($user,$pass);
            $hasil=count($cek);

                if($hasil > 0)
                {

                   $pelogin =$this->db->get_where('usuarios',array('username' => $user, 'password' => $pass))->row();
                  // here $pelogin has the id of the user 
                 // create session like this 
                  $this->session->set_userdata(array('id' => $pelogin->id));

                  if($pelogin ->type == 0)
                  {
                    // here goes  the admin data 
                     redirect('login/admin');
                  }

                  else{
                           //call here usuario method which has user data who logged in like
                             redirect('login/usuario');
                          // OR
                          // Call some method which has user data in $records and 
                      }
                }
            redirect('login/index');
        }
    }



            public function admin (){

                  $data['records']=$this->m_login->getDetails();
                  $this->load->view('admin',$data);
                }


            public function usuario(){

                    $data['records']=$this->m_login->getDetails();
                    $this->load->view('usuario',$data);
                }

和模型文件("m_login")- 与查询！

    <?php

        class m_login extends CI_Model{

            public function proceso_login($user,$pass){

                $this->db->where('username', $user);
                $this->db->where('password', $pass);
                return $this->db->get('usuarios')->row();

            }



            public function getDetails()
                {
                    $st=$this->db->SELECT('cursadas.*, usuarios.name as usuarios, materias.name as materias_name')->from('cursadas')
                        ->join('usuarios','usuarios.id=cursadas.user_id')
                        ->join('materias','materias.id=cursadas.subject_id')
                        ->WHERE('cursadas.user_id=',$this->session->userdata['id'])
                        ->get()->result_array();
                    return $st[0]; 
                }



}
?>

Answer 1

更改查询：

$st = $this->db->SELECT('cursadas.date as date, cursadas.grade as grade, usuarios.username as user, materias.name as subject')->from('cursadas')
                    ->join('usuarios','usuarios.id=cursadas.user_id')
                    ->join('materias','materias.id=cursadas.subject_id')
                    ->WHERE('cursadas.user_id=',$this->session->userdata('id'))
                    ->get()->result_array();
                return $st;

并且请检查数据库字段类型使用 datetime 作为 date int 作为 id 等

在视图中：

<tbody>
<?php

if (count($records) > 0 && $records != false) {
    $id = 1;
    foreach($records as $record) {

        echo "<tr>
                  <td>".$id."</td>
                  <td>".$record['user']."</td>
                  <td>".$record['subject']."</td>
                  <td>".$record['grade']."</td>
                  <td>".$record['date']."</td>
              </tr>";
       $id++;
    }

   }
?>

尝试使用 codeigniter 获取数据时出错

Error trying to fetch data using codeigniter

php

codeigniter

fetch