json - n1ql 查询更新 json 数据数组中的多个参数

Question

以下是 couchbase 中的示例文档 (userdetails)。

{
"friends": [
  {
    "company": "microsoft",
    "firstname": "criss",
    "lastname": "angel"
  },
  {
    "company": "google",
    "firstname": "captain",
    "lastname": "america"
  }
]}

基于“公司”，我想更改“名字”和“姓氏”

N1ql 查询(更新单个参数(名字))

update default use keys "userdetails" set a.firstname="xyz" for a in friends when a.company="microsoft" end returning friends

以上查询完美运行。
但我正在努力编写更新两个参数(名字，姓氏)的查询

N1ql查询(更新两个参数)

update default use keys "userdetails" set a.firstname="abc",a.lastname="xyz" for a in friends when a.company="microsoft" end returning friends

以上查询仅更新“lastname”。

输出

{
"friends": [
  {
    "company": "microsoft",
    "firstname": "criss",
    "lastname": "xyz"
  },
  {
    "company": "google",
    "firstname": "captain",
    "lastname": "america"
  }
]}

Answer 1

每个 SET 术语都是独立的，因此您可以执行以下操作:

UPDATE default
USE KEYS "userdetails"
SET a.firstname="abc" FOR a IN friends WHEN a.company="microsoft" END,
    a.lastname="xyz" FOR a IN friends WHEN a.company="microsoft" END
RETURNING friends;

为了回答您的评论，以下两种形式避免了双重循环。您可以使用实际数据进行测量，以查看哪种形式的性能最佳。

UPDATE default
USE KEYS "userdetails"
SET friends[i] = {"firstname":"abc", "lastname":"xyz", "company":"microsoft"} FOR i : a IN friends WHEN a.company="microsoft" END
RETURNING friends;

UPDATE default
USE KEYS "userdetails"
SET friends[i] = OBJECT_PUT(OBJECT_PUT(a, "firstname", "abc"), "lastname", "xyz") FOR i : a IN friends WHEN a.company="microsoft" END
RETURNING friends;