couchdb

问题 I've been trying to see if I can accomplish some requirements with a document based database, in this case CouchDB. Two generic requirements: CRUD of entities with some fields which have unique index on it ecommerce web app like eBay (better description here). And I'm begining to think that a Document-based database isn't the best choice to address these requirements. Furthermore, I can't imagine a use for a Document based database (maybe my imagination is too limited). Can you explain to me

问题 I've been trying to see if I can accomplish some requirements with a document based database, in this case CouchDB. Two generic requirements: CRUD of entities with some fields which have unique index on it ecommerce web app like eBay (better description here). And I'm begining to think that a Document-based database isn't the best choice to address these requirements. Furthermore, I can't imagine a use for a Document based database (maybe my imagination is too limited). Can you explain to me

问题 When I call an Android ContentProvider I get the following exception: java.lang.RuntimeException: Unable to start activity ComponentInfo{de.harm.android.couchone/de.harm.android.couchone.CouchContactClient}: java.lang.IllegalArgumentException: Unknown URL content://de.harm.android.couchone.provider/test2 These are the projects: https://github.com/der-harm/CouchOneProvider .../CouchOneContacts Android uses the so-called ContentResolver to communicate with ContentProvider which in turn handles

问题 I want to implement a webapp - a feed that integrates data from various sources and displays them to users. A user should only be able to see the feed items that he has permissions to read (e.g. because they belong to a project that he is a member of). However, a feed item might (and will) be visible by many users. I'd really like to use CouchDB (mainly because of the cool _changes feed and map/reduce views). I was thinking about implementing the app as a pure couchapp, but I'm having trouble

问题 I have three type of documents: Question User - contains a source field Answer - contains the corresponding question ID and user ID Each questions is answered by multiple users and each user answers each question only once. I want to find for every question how many answers are there answered by users of source "source1". 回答1: I think that the nearer that you can arrive to what you want is the following (using Linked documents). Suppose you have { "_id": "user1", "source": "source1" }, { "_id

问题 In couchdb, one can define map and reduce functions in Javascript, and submit them via HTTP POST to the server to define views. Cool. Apps specify a string representation of the respective functions. I am building a JS app that connects to couchdb, using emacs, a text editor. This lets me define map and reduce functions like this: var byname = function(doc) { emit(doc.name,null); }; This gives me emacs syntax highlighting, jslint checks, and so on. At runtime, I can get the string

问题 Say I have a map that emits the following objects {"basePoints": 2000, "bonusPoints": 1000} {"basePoints": 1000, "bonusPoints": 50} {"basePoints": 10000, "bonusPoints": 5000} How could I write a reduce in Erlang (not javascript) that would return an aggregate object like this: {"basePoints": 13000, "bonusPoints": 6050} (I would rather not have to write 2 separate views that emits each value separately if I can help it) Many Thanks! 回答1: You actually do not need special reduce, in this case

问题 I'm trying to execute a query from java against a Map/Reduce view I have created on the CouchDB. My map function looks like the following: function(doc) { if(doc.type == 'SPECIFIC_DOC_TYPE_NAME' && doc.userID){ for(var g in doc.groupList){ emit([doc.userID,doc.groupList[g].name],1); } } } and Reduce function: function (key, values, rereduce) { return sum(values); } The view seems to be working when executed from the Futon interface (without keys specified though). What I'm trying to do is to

问题 I am retrieving a form value in JavaScript and converting it to a JSON object using JSON.stringify() . Now I want to save it in CouchDB. Can anyone tell how to do that? 回答1: I think it was: var json = {_id:1 friends:["friend1","friend2"]} couchdb.save(json); var friends = couchdb.open(1).friends; Hope that could help you. 来源： https://stackoverflow.com/questions/10570062/saving-json-object-in-couchdb-from-javascript

问题 What are these functions? Where can I read about how they work? The CouchDB definitive guide doesn't explain it, weird. 回答1: From the CouchDB definitive guide: There are other design document functions that are being introduced at the time of this writing, including _update and _filter that we aren’t covering in depth here. Filter functions are covered in Chapter 20, Change Notifications. Imagine a web service that POSTs an XML blob at a URL of your choosing when particular events occur.