update

app/Http/Controllers/Admin/BaseController.php

@@ -91,6 +91,14 @@ class BaseController extends CommonController
                     if ($op == 'notlike') {
                         $query->where($key, 'not like', '%' . $value . '%');
                     }
+                    // null搜索
+                    if ($op == 'null') {
+                        $query->whereNull($key);
+                    }
+                    // notnull搜索
+                    if ($op == 'notnull') {
+                        $query->whereNotNull($key);
+                    }
                     // 范围搜索
                     if ($op == 'range') {
                         list($from, $to) = explode(',', $value);

app/Http/Controllers/Admin/CourseContentController.php

@@ -80,6 +80,14 @@ class CourseContentController extends BaseController
                         if ($op == 'notlike') {
                             $query->where($key, 'not like', '%' . $value . '%');
                         }
+                        // null搜索
+                        if ($op == 'null') {
+                            $query->whereNull($key);
+                        }
+                        // notnull搜索
+                        if ($op == 'notnull') {
+                            $query->whereNotNull($key);
+                        }
                         // 范围搜索
                         if ($op == 'range') {
                             list($from, $to) = explode(',', $value);