hash查询修改

hash.go

@@ -16,7 +16,7 @@ func GetByHashKey(key, field string, url ...string) (string, error) {
 
 	conn, _, err := DialRedisService("tcp", user_rpc_url)
 	if err != nil {
-		return nil, err
+		return "", err
 	}
 	defer conn.Close()