使用 $this->db->count_all_results() 时出错；作为对布尔值的成员函数 num_rows() 的调用

Question

在我的模型中，我有一个根据 category_id

获取产品数量的函数

public function products_count($category_id, $subcategory_id = null, $brand_id = null)
{
    if ($category_id) {
        $this->db->where('category_id', $category_id);
    }
    if ($subcategory_id) {
        $this->db->where('subcategory_id', $subcategory_id);
    }
    if ($brand_id) {
        $this->db->where('brand', $brand_id);
    }
    $this->db->where('hide_pos !=', 1);
    $this->db->from('products');
    return $this->db->count_all_results();
}

我收到错误消息

An uncaught Exception was encountered

Type: Error

Message: Call to a member function num_rows() on boolean

Filename: /var/www/html/projects/demo/system/database/DB_query_builder.php

Line Number: 1429

Backtrace:

File: /var/www/html/projects/demo/app/models/admin/Pos_model.php
Line: 158
Function: count_all_results

错误是什么问题。谢谢

Answer 1

为什么不用$this->db->num_rows()代替$this->db->count_all_results()，结果更准确，我正在重写你的函数，请试试这个。

public function products_count($category_id, $subcategory_id = null, $brand_id = null)
{
    $this->db->from('products');
    if ($category_id) {
        $this->db->where('category_id', $category_id);
    }
    if ($subcategory_id) {
        $this->db->where('subcategory_id', $subcategory_id);
    }
    if ($brand_id) {
        $this->db->where('brand', $brand_id);
    }
    $this->db->where('hide_pos !=', 1);
    $this->db->get();
    return $this->db->num_rows();
}

如果您想使用自己的代码，只需将 $this->db->from('products') 放在最上面，我希望它也能正常工作。

Answer 2

如果我猜你使用的是 Codeigniter 4。如果这是真的。请在下面使用它。我认为它会帮助你解决这个问题。如果您要扩展到 Codeigniter 核心模型，则不需要 $this->db。刚刚

扩展到 Codeigniter 核心模型，使用

public function products_count($category_id, $subcategory_id = null, $brand_id = null)
{
    $query = $this->table('products'); // self::table('products')

    if ($category_id) {
        $query = $query->where('category_id', $category_id);
    }
    if ($subcategory_id) {
        $query = $query->where('subcategory_id', $subcategory_id);
    }
    if ($brand_id) {
        $query = $query->where('brand', $brand_id);
    }
    $query = $query->where('hide_pos !=', 1);
    
    return $query->countAllResults();
}

如果不扩展到 Codeigniter Core 模型，请使用


public function __construct()
{
    $this->db = db_connect();
}
public function products_count($category_id, $subcategory_id = null, $brand_id = null)
{
    $query = $this->db->table('products');

    if ($category_id) {
        $query = $query->where('category_id', $category_id);
    }
    if ($subcategory_id) {
        $query = $query->where('subcategory_id', $subcategory_id);
    }
    if ($brand_id) {
        $query = $query->where('brand', $brand_id);
    }
    $query = $query->where('hide_pos !=', 1);
    
    return $query->countAllResults();
}

如果您像您所说的那样使用 codeigniter 3，请使用这个


public function products_count($category_id, $subcategory_id = null, $brand_id = null)
{
    $query = $this->db->from('products');

    if ($category_id) {
        $query = $query->where('category_id', $category_id);
    }
    if ($subcategory_id) {
        $query = $query->where('subcategory_id', $subcategory_id);
    }
    if ($brand_id) {
        $query = $query->where('brand', $brand_id);
    }
    $query = $query->where('hide_pos !=', 1);
    
    return $query->count_all_results();
}

或

public function products_count($category_id, $subcategory_id = null, $brand_id = null)
{
    $query = $this->db->from('products');

    if ($category_id) {
        $query = $query->where('category_id', $category_id);
    }
    if ($subcategory_id) {
        $query = $query->where('subcategory_id', $subcategory_id);
    }
    if ($brand_id) {
        $query = $query->where('brand', $brand_id);
    }
    $query = $query->where('hide_pos !=', 1)->get();
    
    return $query->num_row();
}

如果没有引起我的注意，我希望这对您有所帮助

使用 $this->db->count_all_results() 时出错；作为对布尔值的成员函数 num_rows() 的调用

Error for using $this->db->count_all_results(); as Call to a member function num_rows() on boolean

php

codeigniter

codeigniter-3