Couchbase N1QL：嵌套文档更新

Question

当有这样的嵌套文档时：

{
"blog": "testblog1",
"user_id": 41,
"comments": [
    {
        "comment": "testcomment1",
        "user_id": 883
    },
    {
        "comment": "testcomment2",
        "user_id": 790
    }
  ]
}

可以使用 N1QL 执行更新操作以向子文档添加额外的字段吗？

我想将字段 "ranking" : "top comment" 添加到带有注释 testcomment2:

的子文档中

{
"blog": "testblog1",
"user_id": 41,
"comments": [
    {
        "comment": "testcomment1",
        "user_id": 883
    },
    {
        "comment": "testcomment2",
        "user_id": 790,
        "ranking" : "top comment"
    }
  ]
}

站点注意：以下语句将向 Collection 博客上的根文档添加一个字段：

UPDATE Blog SET rank = "top blog" WHERE blog = "testblog1";

Answer 1

是的，您可以在 N1QL 中执行以下操作：

更新博客
SET c.ranking = "top comment" FOR c IN comments WHEN c.comment = "testcomment2" END
WHERE 博客 = "testblog1"

Couchbase N1QL：嵌套文档更新

Couchbase N1QL: Update on nested Documents

couchbase

document

n1ql

nosql