笨的错误：我尝试运行我的项目，并从datatbase选择数据，但我得到这个错误：

Question

笨的错误：我尝试运行我的项目，并从datatbase选择数据，但我得到这个错误：

遇到

甲PHP错误

严重性：警告

消息：（）提供的foreach无效参数

文件名：控制器/ NewsController.php

行号：43

控制器：

class NewsController extends CI_Controller{ 
// num of records per page 
private $limit = 10; 

function News(){ 
    parent::Controller(); 

    // load library 
    $this->load->library(array('table','validation')); 

    // load helper 
    $this->load->helper('url'); 

    // load model 
    $this->load->model('NewsModel','',TRUE); 
} 
function index($offset = 0){ 
    $this->load->model('NewsModel','',TRUE); 
    // offset 
    $uri_segment = 3; 
    $offset = $this->uri->segment($uri_segment); 

    // load data 

    $News1 = $this->NewsModel->get_paged_list($this->limit, $offset)->result(); 

    // generate pagination 
    $this->load->library('pagination'); 
    $config['base_url'] = ('News/index/'); 
    $config['total_rows'] = $this->NewsModel->count_all(); 
    $config['per_page'] = $this->limit; 
    $config['uri_segment'] = $uri_segment; 
    $this->pagination->initialize($config); 
    $data['pagination'] = $this->pagination->create_links(); 

    // generate table data 
    $this->load->library('table'); 
    $this->table->set_empty(" "); 
    $this->table->set_heading('id', 'title', 'image', 'discreption', 'Actions'); 
    $i = 0 + $offset; 
    $newss=$this->load->model('NewsModel'); 
    foreach($newss as $news){ 
     $this->table->add_row(++$i, $news->title, $news->image,$news->discreption); 
      anchor('News/view/'.$news->id,'view',array('class'=>'view')).' '. 
      anchor('News/update/'.$news->id,'update',array('class'=>'update')).' '. 
      anchor('News/delete/'.$news->id,'delete',array('class'=>'delete','onclick'=>"return confirm('Are you sure want to delete this person?')")); 

    } 
    $data['table'] = $this->table->generate(); 

    // load view 
    $this->load->view('NewsList', $data); 
} 

型号：

class NewsModel extends CI_Model{ 
// table name 
private $tbl_News= 'news'; 

function News(){ 
    parent::Model(); 
} 
// get number of News in database 
function count_all(){ 
    return $this->db->count_all($this->tbl_News); 
} 
// get with paging 
function get_paged_list($limit = 10, $offset = 0){ 
    $this->db->order_by('id','asc'); 
    return $this->db->get($this->tbl_News, $limit, $offset); 
} 
// get News by id 
function get_by_id($id){ 
    $this->db->where('id', $id); 
    return $this->db->get($this->tbl_News); 
} 
// add news 
function save($news){ 
    $this->db->insert($this->tbl_News, $news); 
    return $this->db->insert_id(); 
} 
// update News by id 
function update($id, $news){ 
    $this->db->where('id', $id); 
    $this->db->update($this->tbl_News, $news); 
} 
// delete News by id 
function delete($id){ 
    $this->db->where('id', $id); 
    $this->db->delete($this->tbl_News); 
} 

}

Answer 1

检查这一行：

$newss = $this->load->model('NewsModel'); 

您需要调用model function，并且不会再次加载模型。我觉得应该是：

$newss = $this->NewsModel->get_paged_list(); 

或者，改变foreach到：

foreach($News1 as $news){ #$News1 from $News1 = $this->NewsModel->get_paged_list($this->limit, $offset)->result(); 

Answer 2

这里，你就错了

$newss=$this->load->model('NewsModel'); 

做这样的

$this->load->model('NewsModel'); //this line just loads model 
$newss=$this->NewsModel->your_function_in_model(); //here you call function from models that you ve loaded 

Answer 3

我想你不知道h ow load->model()工程。

$this->load->model('NewsModel'); // will load NewsModel on NewsController 
// you can call loaded model by $this->modelName 
$newss = $this->NewsModel->get_paged_list(10, $i); // will call get_paged_list() on NewsModel and result will save on newss 

你的代码中没有这样的函数调用。现在你可以做到这一点foreach($newss as $news)