我的SQL查询如下:
SELECT a.number, a.description,
MAX(CASE WHEN b.attribute_code = 'brand' then b.attribute_value END) as brand,
MAX(CASE WHEN b.attribute_code = 'model' then b.attribute_value END) as model,
MAX(CASE WHEN b.attribute_code = 'category' then b.attribute_value END) as category,
MAX(CASE WHEN b.attribute_code = 'subcategory' then b.attribute_value END) as subcategory
FROM items a JOIN
attr_maps b
ON b.number = a.number
GROUP BY a.number, a.description
HAVING brand = 'honda'
如果执行了查询,则可以正常工作
我想将查询sql转换为laravel查询
我试着这样:
$query = Item::selectRaw("a.number, a.description, MAX(CASE WHEN b.attribute_code = 'brand' then b.attribute_value END) as brand, MAX(CASE WHEN b.attribute_code = 'model' then b.attribute_value END) as model, MAX(CASE WHEN b.attribute_code = 'category' then b.attribute_value END) as category, MAX(CASE WHEN b.attribute_code = 'subcategory' then b.attribute_value END) as subcategory")
->from('items as a')
->join('attr_maps as b','b.number','=','a.number')
->groupBy('a.number');
foreach($param as $key => $value) {
$query = $query->havingRaw("$key = $value");
}
$query = $query->orderBy('description')
->paginate(10);
return $query;
它执行的查询,存在这样的错误:
SQLSTATE[42S22]: Column not found: 1054 Unknown column 'brand' in 'having clause' (SQL: select count(*) as aggregate from `items` as `a` inner join `attr_maps` as `b` on `b`.`no` = `a`.`no` group by `a`.`no` having brand = honda)
我该如何解决错误?
注意
echo '<pre>';print_r($param);echo '</pre>';die();
的结果:
Array
(
[brand] => honda
[model] => pcx
[category] => test1
[subcategory] => test2
)
更新
我找到了解决方案。它是这样的:
public function list($param)
{
$brand = "MAX(CASE WHEN b.attribute_code = 'brand' then b.attribute_value END)";
$model = "MAX(CASE WHEN b.attribute_code = 'model' then b.attribute_value END)";
$category = "MAX(CASE WHEN b.attribute_code = 'category' then b.attribute_value END)";
$subcategory = "MAX(CASE WHEN b.attribute_code = 'subcategory' then b.attribute_value END)";
$query = Item::selectRaw("a.number, a.description, {$brand} as brand, {$model} as model, {$category} as category, {$subcategory} as subcategory")
->from('items as a')
->join('item_attr_maps as b','b.number','=','a.number')
->groupBy('a.number');
foreach($param as $key => $value) {
$query = $query->havingRaw("{$$key} = ?", [$value]);
}
$query = $query->orderBy('description')
->paginate(self::ITEM_PER_PAGE);
return $query;
}
你必须在having子句中提供aggregate
函数,我们可以重用我们在select中选择的那个像这样
$brand = "MAX(CASE WHEN b.attribute_code = 'brand' then b.attribute_value END)";
$model = "MAX(CASE WHEN b.attribute_code = 'model' then b.attribute_value END)";
$category = "MAX(CASE WHEN b.attribute_code = 'category' then b.attribute_value END)";
$subcategory = "MAX(CASE WHEN b.attribute_code = 'subcategory' then b.attribute_value END)";
$brandName = 'honda';
$query = Item::selectRaw("a.number, a.description, {$brand} as brand, {$model} as model, {$category} as category, {$subcategory} as subcategory")
->from('items as a')
->join('attr_maps as b','b.number','=','a.number')
->groupBy('a.number')
->havingRaw("{$brand} = ?", [$brandName])
->orderBy('description')
->paginate(10);
return $query;
编辑:评论后
你可以像这样执行每个参数
$query = Item::selectRaw("a.number, a.description, {$brand} as brand, {$model} as model, {$category} as category, {$subcategory} as subcategory")
->from('items as a')
->join('attr_maps as b','b.number','=','a.number')
->groupBy('a.number')
->orderBy('description');
foreach($param as $key => $value) {
$query = $query->havingRaw("{$$key} = ?", [$value]);
}
$results = $query->paginate(10);
return $results;
希望这能帮到你 -
$perPage = $request->input("per_page", 10);
$page = $request->input("page", 1);
$skip = $page * $perPage;
if($take < 1) { $take = 1; }
if($skip < 0) { $skip = 0; }
$basicQuery =DB::select(DB::raw("SELECT a.number, a.description,
MAX(CASE WHEN b.attribute_code = 'brand' then b.attribute_value END) as brand,
MAX(CASE WHEN b.attribute_code = 'model' then b.attribute_value END) as model,
MAX(CASE WHEN b.attribute_code = 'category' then b.attribute_value END) as category,
MAX(CASE WHEN b.attribute_code = 'subcategory' then b.attribute_value END) as subcategory
FROM items a JOIN
attr_maps b
ON b.number = a.number
GROUP BY a.number, a.description
HAVING brand = 'honda'"
));
$totalCount = $basicQuery->count();
$results = $basicQuery
->take($perPage) // can be 10
->skip($skip)
->get();
$paginator = new \Illuminate\Pagination\LengthAwarePaginator($results, $totalCount, $take, $page);
return $paginator;