update db

db/db.go

@@ -16,20 +16,21 @@ 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)
-	iter := dbInstance.NewIterator(nil, nil)
-	defer iter.Release()
-	for iter.Next() {
-		key := iter.Key()
-		modelKeys[string(key)] = true
-	}
-	if err := iter.Error(); err != nil {
-		log.Fatal(err)
+	} else {
+		iter := dbInstance.NewIterator(nil, nil)
+		defer iter.Release()
+		for iter.Next() {
+			key := iter.Key()
+			modelKeys[string(key)] = true
+		}
+		if err := iter.Error(); err != nil {
+			log.Fatal(err)
+		}
 	}
 }