如果記錄已存在，則顯示消息

Question

我是新手CodeIgniter。我創建了一個在MySQL數據庫表中插入記錄的方法現在使查詢停止，如果具有相同名稱的記錄已經存在，所以我寫道：

public function set_project() 
    { 
     // If project name already exists? 
     $query = $this->db->query("SELECT pro_id FROM projects WHERE pro_name = '".$this->input->post('pro_name')."'"); 

     if (sizeof($query->row_array()) == 0) { 

      $data = array(
       'is_featured' => $this->input->post('is_featured'), 
       'pro_type' => $this->input->post('pro_type'), 
       'pro_name' => $this->input->post('pro_name'), 
       'pro_client' => $this->input->post('pro_client'), 
       'pro_loc_city' => $this->input->post('pro_loc_city'), 
       'pro_loc_state' => $this->input->post('pro_loc_state'), 
       'pro_yr_start' => $this->input->post('pro_yr_start'), 
       'pro_yr_end' => $this->input->post('pro_yr_end'), 
       'pro_loc_cur' => $this->input->post('pro_loc_cur'), 
       'pro_size' => $this->input->post('pro_size'), 
       'pro_size_cat' => $this->input->post('pro_size_cat'), 
       'pro_size_units' => $this->input->post('pro_size_units'), 
       'pro_desc' => $this->input->post('pro_desc') 
      ); 

      return $this->db->insert('projects', $data); 

     } else { 
      return "Already exists"; 
     } 

其工作正常，但誰，我可以顯示消息，我的看法？

Answer 1

好吧，我做到了，其實我必須在控制器中移動該檢查。

Answer 2

您正在編寫return "Already exists"，而是將代碼的輸出更改爲echo '<script>alert("Already exists!")</script>';。