couchdb

问题 Closed . This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed 6 years ago . For last several years I have noticed that interest to NoSQL DBs is increasing. A lot of new such DBs are released : MongoDB CouchDB Memcachedb memcached Velocity Cassandra Tokyo Cabinet etc.. What you think is it targeted to replace relational model and in general how do you

问题 Closed . This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed 6 years ago . For last several years I have noticed that interest to NoSQL DBs is increasing. A lot of new such DBs are released : MongoDB CouchDB Memcachedb memcached Velocity Cassandra Tokyo Cabinet etc.. What you think is it targeted to replace relational model and in general how do you

问题 I wrote simple update handler: { "handler": "function (doc, req) { if (req.userCtx.roles.indexOf('editor') < 0) return [req.userCtx, 'access error']; if (!doc) { return [doc, 'nothing']; } doc.date = new Date(); doc.edited_by = req.userCtx.name; return [doc, toJSON(doc)]; }" } When I'm trying to query from Mozilla HttpRequester http://192.168.0.34:5984/records/_design/records/_update/handler , i'm getting with that's data {"title":"testtest","content":"test"} And getting {"error":"bad_request

问题 Is there any way to apply unique constraint in couchdb ? Suppose I have a document which have some fields like email , emp_id , phone_number that needs to be unique throughout the document. I could not find any way. Anyone knows how to achieve this? Any answer/suggestion would be appreciated. 回答1: after a lot of searching, I found that If you want to add a unique constraint to only one parameter you can set it as id. But If there are multiple parameter that needs to be unique, then this is

问题 I Want to query CouchDB and I have a specific need : my query should return the name field of documents corresponding to this condition : the id is equal or contained in a document filed (a list). For example, the field output is the following : "output": [ "doc_s100", "doc_s101", "doc_s102", "doc_s103", ], I want to get all the documents having in their output field "doc_s102" for example. I wrote a view in a design document : "backward_by_docid": { "map": "function(doc) {if(doc.output) emit

问题 I've never worked with a database before, but I chose Couch DB because I needed a Json database, and HTTP queries seemed kinda simple. However the documentation assumes a level of knowledge I just don't have. Assuming I have a database called 'subjects', it seems I can access the json by using GET on http://localhost:5984/subjects/c6604f65029f1a6a5d565da029001f4c However beyond that I'm stuck. Ideally I want to be able to: Access a list of all the keys in the database (not their values)

问题 I've never worked with a database before, but I chose Couch DB because I needed a Json database, and HTTP queries seemed kinda simple. However the documentation assumes a level of knowledge I just don't have. Assuming I have a database called 'subjects', it seems I can access the json by using GET on http://localhost:5984/subjects/c6604f65029f1a6a5d565da029001f4c However beyond that I'm stuck. Ideally I want to be able to: Access a list of all the keys in the database (not their values)

问题 In my ubuntu 18.04, installed couch db using this repo. In order to data persistance, i have created docker volume using the command docker volume create --name couchdbvolume . I used docker run -p 5984:5984 -d couchdb -v couchdbvolume:/opt/couchdb/data --name some-couchdb command to create new docker process. Instead of using existing volume, every time docker creates new volume. So i loss data in every restart. As per this question , un-named volumes are created if the docker file doesn't

问题 I am use HttpClient and mime to put the image file from Android client to CouchDB. But there are some error message like this D/FormReviewer(4733): {"error":"bad_request","reason":"invalid UTF-8 JSON: <<45,45,103,75,66,70,69,104,121,102,121,106,72,66,101,80,\n here is my code final String ProfileBasicID = UUID.randomUUID().toString(); Data.postImage(IconFile, "http://spark.iriscouch.com/driver/"+ProfileBasicID,new Callback<String>()) public static void postImage(File image,String url,

问题 I am using one DB for storing plain documents and another DB for storing only attachments. But i am storing attachment id in plain documents DB. Is there any way how to perform join operations two databases like RDBMS. Thanks in Advance 回答1: I know that it's possible to do joins within a database: Here's a great post on that: http://www.cmlenz.net/archives/2007/10/couchdb-joins The crux of it is that couchdb can order json values, including lists. So let's take it from the top...CouchDB, as