php - where 子句在 codeigniter 中不起作用

Question

我在带有 where 子句的页面中显示产品。我正在从产品表中选择类别为蔬菜的所有内容，但它不起作用。我是 CodeIgniter 的新手。我也在网上查了很多问题，但没有任何作用。如果这段代码有任何错误，请告诉我。

Controller 部分:

<?php
class products_list extends CI_Controller
{
function __construct() {
        parent::__construct();
        $this->load->helper('url');     //to load css base url
        $this->load->helper('form');
        $this->load->library('form_validation');
        $this->load->model("pagination_model");
        $this->load->library("pagination");
        $this->load->library('table');
}


function vegetables(){

    $this ->load->view('includes/header1');

    $config['base_url']='http://localhost/mah/index.php/products_list/vegetables';

    $vegetable="Vegetable";
    $config['total_rows']= $this->db->get_where('product', $vegetable)->num_rows();
    $config['per_page'] = 12;
    $config['num_links'] = 20;
    $config['full_tag_open']='<div id="pagination">';
    $config['full_tag_close']='</div>';

    $this->pagination->initialize($config);
    $page = ($this->uri->segment(3)) ? $this->uri->segment(3) : 0;
    $data["results"] = $this->pagination_model->
            fetch_product($config["per_page"], $page);
    $data["links"] = $this->pagination->create_links();
    $this->load->view("product_display",    $data);

    $this ->load->view('includes/footer');

}

public function article($id)
{
    $this ->load->view('includes/header');
    $this->load->model('articles_model', 'product');
    $article = $this->product->find($id);
    $this->load->view('product_details', compact('article'));
}

}
?>

模型部分:

<?php
class pagination_model extends CI_Model
{
    public function __construct() {
        parent::__construct();
    }

    public function record_count() {
        $where="category='vegetable'";
        return $this->db->count_all("product");
    }

    public function fetch_product($limit, $start) {
        $this->db->limit($limit, $start);

        $query = $this->db->get("product");

        if ($query->num_rows() > 0) {
            foreach ($query->result() as $row) {
                $data[] = $row;
            }
            return $data;
        }
        return false;
   }
}
?>

Answer 1

Controller 方法:

根据您的要求和 base_url 剪裁您的链接

   public function vegetables() {
    $data = array('title' => 'Products');
    $config = array();
    $config['base_url'] = base_url().'products_list/vegetables';
    $config['total_rows'] = $this->pagination_model->countRows('products');
    $config['per_page'] = 5;

    $config['attributes'] = array('class' =>'item');

    $config['first_link'] = 'First';
    $config['cur_tag_open'] = '<a class="active item">';
    $config['cur_tag_close'] = '</a>';

    $config['next_link'] = 'Next';
    $config['last_link'] = 'Last';
    $config['prev_link'] = 'Previous';


    $this->pagination->initialize($config);

    $page = ($this->uri->segment(3)) ? $this->uri->segment(3) : 0;
    $data["products"] = $this->pagination_model->getProducts('',$config["per_page"],$page);
    $data["categoriesData"] = $this->pagination_model->getProducts('vegetable',$config["per_page"],$page);
    $data["links"] = $this->pagination->create_links();
    print_r($data);die;
    //$this->load->view('templates/header',$data);
    $this->load->view('product_display',$data);
    //$this->load->view('templates/footer');    
}

您的型号:

getProducts 获取两种类型的数据

1:如果您提供类别作为第一个参数，那么它将返回类别数据

2:否则获取整个表；

   public function getProducts($category = NULL, $limit = NULL, $start = NULL)
  {
    $limit = $limit == NULL ? '' : $limit;
    $start = $start == NULL ? '' : $start;
    $this->db->order_by('id', 'DESC');
    $this->db->limit($limit, $start);
    if (empty($category)) 
    {
         $query = $this->db->get('products');
    }
    else 
    {
        $query = $this->db->get_where('products', array('category' => $category));
    }


    if ($query->num_rows() > 0) 
    {
        foreach ($query->result_array() as $row) 
        {
            $data[] = $row;
        }
        return $data;
    }
}
 // total count method 

 public function countRows($table) {
    if (empty($table)) return false;
     return $this->db->count_all($table);
}

最后但并非最不重要的一点:

将其添加到 Controller __contruct() 方法中

public function __construct()
 {
    parent::__construct();
    $this->load->helper(array('url','text','html','form'));
    $this->load->library(array('session','form_validation','pagination'));
    $this->load->database();
    $this->load->model('YourModel');
}