Thank you, I will check Pouchdb.
________________________________ From: Bill Stephenson <b...@cherrypc.com> Sent: Thursday, April 26, 2018 9:37:42 AM To: user@couchdb.apache.org Subject: Re: Some questions about couchdb Hi Jinmin, > On Apr 25, 2018, at 7:11 PM, 明 淨 <jinmin...@outlook.com> wrote: > > What I'm thinking about is the following things: > > 1. If I store the info of a person as a document in couchdb, will update of a > few words in his/her self introduction cause the whole document to be > rewrite? also, I have to submit the whole document to make this a few words > update? Shall couchdb support field unit update in the future? In a nutshell yes, you will update the entire document but that’s easy. You “get” the document as a JSON object and then update just the parts of the object you want and then “put” the updated document object back in the database. > > 2. By default, a user of a database in couchdb can update all the documents > in the database, but usually in the real world, every document has it's > owner, and shouldn't be updated by users other than the owner. Is there any > mechanism in couchdb to support document unit authorization? With CouchDB you can set it up so every user has their own database that only they can create, modify, and delete documents in. You can assign other users “roles” and add them to a database's “Permissions” that allow them to only read documents in a database as well. > > 3. As replication is the basis of data sync across cluster nodes, so will > couchdb support field unit update in cluster data sync, not just document > unit? I don’t know the answer to this, but I do know you can replicate and sync databases between more than one CouchDB server. You don’t need a cluster to do that though. I will suggest you take a look at PouchDB too. The info on their site will help you get a feel for some of the ways you can manage users and documents and permissions and you can use PouchDB in your web browser offline without a CouchDB server, and you can sync your web browser database with a remote CouchDB server, or just use PouchDB with a remote CouchDB server. https://pouchdb.com Also check out their “Authentication” plugin page to learn more about how you can manage users and database permissions on your CouchDB: https://github.com/pouchdb-community/pouchdb-authentication/blob/master/docs/recipes.md I hope this helps, Bill
