update db

db/db.go

@@ -16,12 +16,12 @@ var (
 )
 
 func init() {
+	modelKeys = make(map[string]bool, 0)
 	// 打开或创建一个LevelDB数据库
 	dbInstance, err = leveldb.OpenFile("data/mydb", nil)
 	if err != nil {
 		log.Error("Leveldb open file failed: ", err)
-	}
-	modelKeys = make(map[string]bool, 0)
+	} else {
 		iter := dbInstance.NewIterator(nil, nil)
 		defer iter.Release()
 		for iter.Next() {
@@ -31,6 +31,7 @@ func init() {
 		if err := iter.Error(); err != nil {
 			log.Fatal(err)
 		}
+	}
 }
 
 func Put(key string, value any) error {