Question

我正在尝试获取单个列的最后一个用户记录，以将其添加到其他表中的另一列中

我尝试过这样编码

    {
        $data = request()->validate([
            'accnumber' => 'required',
            'amt_debit' => 'required',
            'bankname' => 'required',
            'swift_code' => 'required',
            'Remarks' => 'required',
            'acc_type' => 'required',    
        ]);

        // auth()->user()->funds()->create($data);

        $user_id = auth()->user()->id;

        $debit = DB::table('funds')->where('user_id', $user_id)->pluck('amt_debit')->latest()
        ->first();

        $amt = DB::table('accounts.balance')->where('user_id', $user_id)->first();

        $sum = $debit + $amt;

        echo $sum;
    }

请我对此有所了解

Answer 1

尝试像这样更改总和代码：

$sum = $debit->amt_debit + $amt->balance;

因为选择一列，它会像这样返回：

attributes: array:1 [
    "amt_debit" => "your amount"
]

因此您需要从班级中调用该列。

Answer 2

如果您只需要单个值，一行中的单个列，则可以使用from math import sqrt keyboard_cartesian = {'q': {'x':0, 'y':0}, 'w': {'x':1, 'y':0}, 'e': {'x':2, 'y':0}, 'r': {'x':3, 'y':0}, 't': {'x':4, 'y':0}, 'y': {'x':5, 'y':0}, 'u': {'x':6, 'y':0}, 'i': {'x':7, 'y':0}, 'o': {'x':8, 'y':0}, 'p': {'x':9, 'y':0}, 'a': {'x':0, 'y':1},'z': {'x':0, 'y':2},'s': {'x':1, 'y':1},'x': {'x':1, 'y':2},'d': {'x':2, 'y':1},'c': {'x':2, 'y':2}, 'f': {'x':3, 'y':1}, 'b': {'x':4, 'y':2}, 'm': {'x':5, 'y':2}, 'j': {'x':6, 'y':1}, 'g': {'x':4, 'y':1}, 'h': {'x':5, 'y':1}, 'j': {'x':6, 'y':1}, 'k': {'x':7, 'y':1}, 'l': {'x':8, 'y':1}, 'v': {'x':3, 'y':2}, 'n': {'x':5, 'y':2}, } def euclidean_distance(a,b): X = (keyboard_cartesian[a]['x'] - keyboard_cartesian[b]['x'])**2 Y = (keyboard_cartesian[a]['y'] - keyboard_cartesian[b]['y'])**2 return math.sqrt(X+Y) for i in keyboard_cartesian.keys(): for j in keyboard_cartesian.keys(): distance_from_i_to_j = [(i, j, euclidean_distance(i, j))]方法：

value

Laravel 6.x Docs - Query Builder - Retrieving Results - Retrieving A Single Row / Column From A Table $debit = DB::table('funds') ->where('user_id', $user_id) ->latest() ->value('amt_debit'); $amt = DB::table('accounts') ->where('user_id', $user_id) ->value('balance');

laravel的数据库查询生成器中是否有一种方法可以检索数据库表中的单行列

2 个答案: