laravel 多条件查询用法

方法一、直接用where和匿名函数用法：

 $list = DB::table($this->table)
 ->join('user', 'user.id', '=', $this->table . '.user_id')
 ->where(function($query) use($data) {
     if (!empty($data['order_sn'])) {
         $query->where($this->table . '.order_sn', 'like', '%' . $data['order_sn'] . '%');
     }
 })
 ->where(function($query) use($data) {
     if (isset($data['order_status']) && is_numeric($data['order_status'])) {
         $query->where($this->table . '.order_status', '=', $data['order_status']);
     }
 })
 ->where(function($query) use($data) {
     if (isset($data['ship_status']) && is_numeric($data['ship_status'])) {
         $query->where($this->table . '.ship_status', '=', $data['ship_status']);
     }
 })
 ->where(function($query) use($data) {
     if (isset($data['pay_status']) && is_numeric($data['pay_status'])) {
         $query->where($this->table . '.pay_status', '=', $data['pay_status']);
     }
 })
 ->where(function($query) use($data) {
     if (!empty($data['start_time']) && !empty($data['end_time'])) {
         $query->where($this->table . '.update_time', '>=', $data['start_time'])
     ->where($this->table . '.update_time', '<=', $data['end_time']);
     } else if (!empty($data['start_time'])) {
         $query->where($this->table . '.update_time', '>=', $data['start_time']);
     } else if (!empty($data['end_time'])) {
         $query->where($this->table . '.update_time', '<=', $data['end_time']);
     }
 })
 ->where($this->table . '.drugstore_id', '=', 0)
 ->where($this->table . '.user_id', '!=', 0)
 ->select($this->table . '.id as id',
     $this->table . '.order_sn as order_sn',
     $this->table . '.order_status as order_status',
     $this->table . '.ship_status as ship_status',
     $this->table . '.pay_status as pay_status',
     $this->table . '.total_paid as total_paid',
     $this->table . '.update_time as update_time',
     'user.nickname as name',
     'user.mobile as phone',
     $this->table . '.is_remittance as is_remittance')
 ->orderBy($sortby, $sortvalue)
 ->take($data['pageSize'])
 ->skip($data['pageNo'] > 1 ? ($data['pageNo'] - 1) * $data['pageSize'] : 0)
 ->get();

方法二：用when方法及匿名函数

https://d.laravel-china.org/docs/5.4/queries#conditional-clauses

有时候，你希望某个值为 true 时才执行查询。例如，如果在传入请求中存在指定的输入值的时候才执行这个 where语句。你可以使用 when 方法实现：

$role = $request->input('role');

$users = DB::table('users')
                ->when($role, function ($query) use ($role) {
                    return $query->where('role_id', $role);
                })
                ->get();

只有当 when 方法的第一个参数为 true 时，闭包里的 where 语句才会执行。如果第一个参数是 false，这个闭包将不会被执行。

你可能会把另一个闭包当作第三个参数传递给 when 方法。如果第一个参数的值为 false 时，这个闭包将执行。为了说明如何使用此功能，我们将使用它配置默认排序的查询：

$sortBy = null;

$users = DB::table('users')
                ->when($sortBy, function ($query) use ($sortBy) {
                    return $query->orderBy($sortBy);
                }, function ($query) {
                    return $query->orderBy('name');
                })
                ->get();