Codeigniter 将 WHERE 子句注入从模型中提取的现有查询中

Question

这是我的困境：我需要在我的网站查询中使用 $this->request->uri->getSegments() 的值作为 WHERE 子句。我知道 $this->request->uri->getSegments() 只能在控制器中访问，所以如果我从模型调用控制器中的查询，即

控制器：

$brand = $this->request->uri->getSegment(1);

$model = new ShopModel();
data ['shop'] = $model->products()

型号：

    public function products()
    {
        $query = $this  ->table('shop')
                        ->select('brand_name, brand_name_slug, count(*) as brand_name_total')
                        ->join('(SELECT sku, MIN(sale_price) as sale_price FROM shop GROUP BY sku) as min', 'shop.sku = min.sku and shop.sale_price = min.sale_price')
                        ->where('availability', 'in stock')
                        ->where('shop.sku !=', '')
                        ->groupBy('brand_name')
                        ->orderBy('brand_name')
                        ->findAll();

        return $query;
    }

有没有办法让我在 Controller 中将 ->where('brand', $brand) 子句注入 $model->products()？

注意：我已经尝试过在控制器中构建所有查询（逐行）并按顺序添加 WHERE 语句的想法，但是我不断遇到错误，这将是 'tidier'解决方案。

Answer 1

您可以像调用任何其他函数一样在函数中将变量作为参数传递。 (Reference)

控制器

$brand = $this->request->uri->getSegment(1);

$model = new ShopModel();
data ['shop'] = $model->products($brand); // pass the variable

型号

public function products($brand){ // get the variable value 

    $query = $this  ->table('shop')
                    ->select('brand_name, brand_name_slug, count(*) as brand_name_total')
                    ->join('(SELECT sku, MIN(sale_price) as sale_price FROM shop GROUP BY sku) as min', 'shop.sku = min.sku and shop.sale_price = min.sale_price')
                    ->where('availability', 'in stock')
                    ->where('shop.sku !=', '')
                    ->where('brand', $brand) // use it in where clause
                    ->groupBy('brand_name')
                    ->orderBy('brand_name')
                    ->findAll();

    return $query;
}

编辑

如果你想发送multiple parameters，你可以一个一个发送，也可以在一个array中发送，然后在你的model中，你可以检查变量是否被定义或不，像这样

通过 multiple parameters -

控制器

$brand = $this->request->uri->getSegment(1);
$xyz   = 'value';  // make sure to use key same as table column
$abc   = 'some-value';
$pqr   = 'some-other-value';

$model = new ShopModel();
data ['shop'] = $model->products($brand, $xyz, $abc, $pqr); // pass multiple variables

型号

public function products($brand = false, $xyz = false, $abc = false, $pqr = false){ // get variables value and give false default value

    $builder = $db->table('shop');

    $builder->select('brand_name, brand_name_slug, count(*) as brand_name_total');
    $builder->join('(SELECT sku, MIN(sale_price) as sale_price FROM shop GROUP BY sku) as min', 'shop.sku = min.sku and shop.sale_price = min.sale_price');
    $builder->where('availability', 'in stock');
    $builder->where('shop.sku !=', '');

    if($brand){ // if value is not false
        $builder->where('brand', $brand); // use it in where clause
    }
    if($xyz){ 
        $builder->where('xyz', $xyz);
    }
    if($abc){
        $builder->where('abc', $abc);
    }
    if($pqr){
        $builder->where('pqr', $pqr);
    }

    $builder->groupBy('brand_name')
    $builder->orderBy('brand_name')

    $query =  $builder->findAll();

    return $query;
}

或作为 array

控制器

$arr['brand'] = $this->request->uri->getSegment(1);
$arr['xyz']   = 'value';  // make sure to use key same as table column
$arr['abc']   = 'some-value';
$arr['pqr']   = 'some-other-value';

$model = new ShopModel();
$data['shop'] = $model->products($arr); // pass the $arr array as parameter

型号

public function products($arr){ // get values in array

    $builder = $db->table('shop');

    $builder->select('brand_name, brand_name_slug, count(*) as brand_name_total');
    $builder->join('(SELECT sku, MIN(sale_price) as sale_price FROM shop GROUP BY sku) as min', 'shop.sku = min.sku and shop.sale_price = min.sale_price');
    $builder->where('availability', 'in stock');
    $builder->where('shop.sku !=', '');

    if(!empty($arr['brand']){ // if value is not false
        $builder->where('brand', $arr['brand']); // use it in where clause
    }
    if(!empty($arr['xyz']){
        $builder->where('xyz', $arr['xyz']);
    }
    if(!empty($arr['abc']){ 
        $builder->where('abc', $arr['abc']);
    }
    if(!empty($arr['pqr']){ 
        $builder->where('pqr', $arr['pqr']);
    }

    $builder->groupBy('brand_name')
    $builder->orderBy('brand_name')

    $query =  $builder->findAll();

    return $query;
}

您还可以在 model 中使用 foreach 来防止代码重复 -

型号

public function products($arr){ // get values in array

    $builder = $db->table('shop');

    $builder->select('brand_name, brand_name_slug, count(*) as brand_name_total');
    $builder->join('(SELECT sku, MIN(sale_price) as sale_price FROM shop GROUP BY sku) as min', 'shop.sku = min.sku and shop.sale_price = min.sale_price');
    $builder->where('availability', 'in stock');
    $builder->where('shop.sku !=', '');

    foreach($arr as $key => $val){
        if(!empty($val)){ // or if($val != "") -- if value is not false 
            $builder->where($key, $val); // use it in where clause
        }
    }        

    $builder->groupBy('brand_name')
    $builder->orderBy('brand_name')

    $query =  $builder->findAll();

    return $query;
}

看看这是否对您有帮助。

Codeigniter 将 WHERE 子句注入从模型中提取的现有查询中

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编辑