Question

我有2个表，如下所示

teacher_student

id  teacher_id   student_id
1     2           1
2     2           2
3     2           3
4     3           2 
5     3           4

学生

id  name    age  
1    n1     12
2    n2     13
3    n3     14
4    n4     15

我希望向所有学生展示每位老师的详细信息

为此，我有以下代码 -

模型

public function get_assigned_student($teacherid)
    {
        $this->db->where('teacherid',$teacherid);
        $query = $this->db->get('teacher_student');
        $data = $query->result();

        foreach ($data as $main_data) 
            {
                $student_id = $main_data->student_id;  

                $this->db->where('id',$student_id);
                $main_query = $this->db->get('student');  
                $main = $main_query->result();
                //echo "<pre>";
                //print_r($main);
                //echo "</pre>";
                return $main;
            }
    }

控制器

public function request($teacherid)
    {
        print_r($this->student_model->get_assigned_student($teacherid));
    }

问题是，当我尝试在控制器下打印结果（用于测试目的）时，我只得到一个值，因为我应该得到一个完整的数组。谁能告诉我哪里出错了？

Answer 1

您似乎必须按照以下代码返回数组中的值：

foreach ($data as $main_data) 
            {
                $student_id = $main_data->student_id;  

                $this->db->where('id',$student_id);
                $main_query = $this->db->get('student');  
                $main[] = $main_query->result_array(); 

            }
            return $main;

使用 result_array（）代替 result（）;

试试这可能会对你有所帮助。

感谢。

Answer 2

试试这样......

控制器

public function request($teacherid)
    {
        $this->load->model('student_model');
        $records=$this->student_model->get_assigned_student($teacherid);
        print_r($records);
    }

模型

public function get_assigned_student($teacherid)
    {
        $this->db->where('teacher_id',$teacherid);
        $query = $this->db->get('teacher_student');
        $data = $query->result_array();
        $std = array();
        foreach ($data as $main_data) 
            {
                $student_id = $main_data->student_id;  

                $this->db->where('id',$student_id);
                $main_query = $this->db->get('student');  
                $main_data = $main_query->result_array();
                //echo "<pre>";
                //print_r($main_data);
                //echo "</pre>";
                $std = array_merge($std,$main_data);
            }
            return $std;
    }

无法在codeigniter中将值从模型传递到控制器

2 个答案: