英文:
Updating fields of a Couchbase document if it exists by Go
问题
我正在使用gocb库。我想要更新文档的特定字段。
然而，如果文档不存在，我不想做任何操作，只是生成一个错误消息。
你可以说首先检索完整的文档本身，然后进行更新并插入。这是可能的。但是，如果有的话，我想要使用一个现成的方法来实现这个目的。因为我不想检索整个文档，我只想更新其中的一些字段。
gocb库中是否有这样的方法？
英文:
I am using gocb library. I want to update specific field of a document.
However if the document does not exist, I don't want to do anything I will just produce an error message.
You can say that first retrieve the full document itself and make update and then insert it.It is possible right. But I want to use a ready for use method for this purpose if there is any. Since I don't want to retrieve the document. I just want to update some fields of it.
Is there a way for this in gocb library?
答案1
得分: 1
如果您想更新文档的部分内容，您可以查看sub-document operations。它只传输文档中被访问的部分，使得对于小的更改更加高效。
示例：https://couchbase.live/examples/basic-go-subdoc-mutate
如果您想重写整个文档，您可以使用Replace()方法，它可以用新文档替换现有文档。它类似于Upsert()，但只能替换现有文档，而不能创建新文档。
常规参考：https://docs.couchbase.com/server/current/guides/updating-data.html
英文:
If you want to update parts of the document, you can look at sub-document operations. It only transmits the accessed sections of the document over the network making it more efficient for small changes.
Example: https://couchbase.live/examples/basic-go-subdoc-mutate
If you want to rewrite the entire document, you are looking for Replace() which replaces an existing document with a new one. It is similar to Upsert() except that it can only replace existing documents & not create new ones.
General Reference:https://docs.couchbase.com/server/current/guides/updating-data.html
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