Question

我与laravel合作已经超过8个月了，我有一个问题要在表格中显示完成的百分比。所以我的想法是，我要计算一行中不为空的列数，然后除以一行中的列数再乘以100。

类似(NumberOfNotNullColumns/totalNumberOfColumns)*100

但是问题是我无法在选定的行中获取NumberOfNotNullColumns。

    $pos_info =  DB::select(DB::raw('SHOW COLUMNS FROM resource'));
        $pos_info_act =  DB::select(DB::raw('SELECT count(*) from resource WHERE * IS NOT NULL AND user_id = '.$resource->user_id));
foreach ($pos_info as $item) $base_columns += 1;
        $percentage = ($pos_info_act/$pos_info)*100;

如您所见，MySQL经验不足

Answer 1

您可以尝试以下查询，

select (sum(case when column is not null then 1 else 0 end)/sum(case when column is null then 1 else 0 end))*100 from tableName

Answer 2

使用模型查询

$all = Resource::count();
$notNull = Resource::whereNotNull('your_field_name')->count();
$percent = ($notNull/$all)*100;
print_r($percent);
exit;

使用数据库查询

$all = DB::table('resource')->count();
$notNull = DB::table('resource')->whereNotNull('your_field_name')->count();
$percent = ($notNull/$all)*100;
print_r($percent);
exit;

您需要指定一个为空或不为空的列

Answer 3

万一有兴趣的人，这就是我最终要做的方式

private function complete_percentage($model, $table_name, $resource){
    $pos_info =  DB::select(DB::raw('SHOW COLUMNS FROM '.$table_name));
    $base_columns = count($pos_info);
    $not_null = 0;
    foreach ($pos_info as $col){
        $not_null += app('App\\'.$model)::selectRaw('SUM(CASE WHEN '.$col->Field.' IS NOT NULL THEN 1 ELSE 0 END) AS not_null')->where('user_id', '=', $resource->user_id)->first()->not_null;
    }

    return ($not_null/$base_columns)*100;
}

Answer 4

如果有人对 PD 感兴趣：抱歉我会说西班牙语，请使用英语翻译器。

在 Lavarel 6 中测试

  //consulting specific user

   $user = User::find(Auth::id());
   //counters
   $contadornull = 0;
   $cantidadcampos = 0;

   // using $user->getFillable() for return all fields the model

    foreach ($user->getFillable() as $key => $campos) {

        //exclude data were user not filliables

        if($campos != 'fotografia' && $campos != 'rango' && $campos != 'password' && 
         $campos != 'estatus')
        {
            //count all fields
            $cantidadcampos = $cantidadcampos + 1;
            //count fields where value is null

            if($user->$campos != null)
            {
                $contadornull++;
            }
        }
        

        
    }
   //calculate percentage
    $porcentaje = $contadornull / $cantidadcampos * 100;

计算连续不为空的列数

4 个答案: