n1ql query to update multiple parameters in array of json data

问题

Following is the sample document ( userdetails) in couchbase.

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

based on the "company", i want to change the "firstname" and "lastname"

N1ql query ( to update single parameter (firstname) )

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

Above query works perfectly.
but Im struggling in writting query for updating two parameters ( firstname,lastname)

N1ql query ( to update two parameter)

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

Above query, is updating only "lastname".

output

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

回答1:

Each SET term is independent, so you can do the following:

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;

To answer your comment, the following two forms avoid the double loop. You can measure with actual data to see which form gives the best performance.

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;

来源：https://stackoverflow.com/questions/37152577/n1ql-query-to-update-multiple-parameters-in-array-of-json-data

标签

json

couchbase

n1ql