Laravel中的多表Mysql连接查询

Question

我正在尝试连接两个表 Customer 和 Customer_Usage 以获得结果。表如下所示。

表：客户

+----+-------+-------------+--------+
| id | Ip_Id | Customer_Id | Class  |
+----+-------+-------------+--------+
| 1  | 100   | A           | First  |
| 2  | 100   | B           | First  |
| 3  | 100   | C           | First  |
| 4  | 101   | D           | First  |
| 5  | 101   | E           | First  |
| 6  | 100   | F           | Second |
+----+-------+-------------+--------+

表：Customer_Usage

+----+-------------+----------------+
| id | Customer_Id | Usage          |
+----+-------------+----------------+
| 1  | A           | 1245           |
| 2  | B           | 4414           |
| 3  | C           | 8521           |
| 4  | D           | 2314           |
| 5  | E           | 521            |
| 6  | F           | 5412           |
+----+-------------+----------------+

条件是为搜索 Ip_Id 输入一个值，例如 100，它将给出如下结果。如何在 Laravel 中使用 Mysql 为这两个表做一个联合

输出结果

+-------+-------------+----------------+
| Ip_Id | Customer_Id | Usage          |
+-------+-------------+----------------+
| 100   | A           | 1245           |
| 100   | B           | 4414           |
| 100   | C           | 8521           |
| 100   | F           | 5412           |
+-------+-------------+----------------+

这是正在尝试的查询。

 $result        = DB::table('Customer')
                ->where('Ip_Id','=','100')
                ->get();

Answer 1

推荐左连接来实现你所需要的。

DB::table('Customer')
            ->select('Customer.Ip_Id','Customer.Customer_Id','Customer_Usage.Usage')
            ->leftJoin('Customer_Usage', 'Customer_Usage.Customer_Id', '=', 'Customer.Customer_Id')
            ->where('Customer.Ip_Id',100)
            ->get();

Answer 2

使用Eloquent Inner Join 喜欢：

$results  = DB::table('Customer')
->select('Customer.Ip_Id','Customer.Customer_Id', 'Customer_Usage.Usage')
->join('Customer_Usage','Customer.Customer_Id', '=','Customer_Usage.Customer_Id')
->where('Ip_Id', 100)                
->get();

您将获得如上所示的所需输出。