From 519f671ab42d5430a3e26735127ed29fe5eac737 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E9=82=B9=E5=AE=97=E6=A5=A0?= <zouzongnan1995@icloud.com>
Date: Tue, 18 Oct 2022 10:54:48 +0800
Subject: [PATCH] 1

---
 dao/print_dao.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/dao/print_dao.go b/dao/print_dao.go
index 4ba86f9..e4d504d 100644
--- a/dao/print_dao.go
+++ b/dao/print_dao.go
@@ -94,6 +94,9 @@ func GetPrintIsUse(printNo string) (bool, string, error) {
 	if err := globals.GetDB().Select(&result, sql, param...); err != nil {
 		return false, "", err
 	}
+	if len(result) != 1 {
+		return false, "", errors.New("打印机不存在")
+	}
 	return len(result) == 1, result[0].PrintKey, nil
 }