Merge branch 'develop'

app/src/main/java/com/bgycc/smartcanteen/viewModel/CommandViewModel.java

@@ -114,7 +114,7 @@ public class CommandViewModel extends ViewModel {
         public void run() {
         public void run() {
             // 指令插入到数据库，则会触发dataObserver
             // 指令插入到数据库，则会触发dataObserver
             Command command = new Command(response, action);
             Command command = new Command(response, action);
-            // 若为更新指令，则需要检查是否有未完成的，避免同时存在多条更新指令重复执行
+            // 该action同一时间是否只能在数据库存在一条待执行的指令
             if (CommandHelper.oneAtTime(command)) {
             if (CommandHelper.oneAtTime(command)) {
                 int count = commandRepository.queryUndoneCommandCountByAction(action);
                 int count = commandRepository.queryUndoneCommandCountByAction(action);
                 if (count > 0) {
                 if (count > 0) {