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Couch DB - Passing input parameters to view


Couch DB - Passing input parameters to view

By : user2953832
Date : November 21 2020, 07:31 AM
Hope that helps I am moving from SQL to Couch DB from my web application, my very first application. , Let your view emit the documents with doc.pid as the key
code :
function(doc) { 
    emit(doc.pid, doc);
}
http://localhost:5984/<database>/_design/<designdoc>/_view/<viewname>?key=<pid2>


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What is Couch DB? What is the process of search & retrieval of data from Couch DB?

What is Couch DB? What is the process of search & retrieval of data from Couch DB?


By : Ian Gardiner
Date : March 29 2020, 07:55 AM
This might help you http://couchdb.apache.org/docs/intro.html
Couch DB is a non-relational, schema-free database. Please visit the project's site to learn more - it would not do to copy-paste the content from there to here.
CouchDB _changes notifications - jquery.couch.js couch.app.db.changes() usage

CouchDB _changes notifications - jquery.couch.js couch.app.db.changes() usage


By : Paul Prasad
Date : March 29 2020, 07:55 AM
seems to work fine I have replication working in CouchDB and want to update my UI when changes are pushed to the target database. I've read about _changes database API and found the couch.app.db.changes() function in jquery.couch.js However I can't work out how to use the function. I assume I need to set up listener, but my knowledge of Javascript is not yet what it needs to be. , Alternatively you can use longpoll changes feed. Here is one example:
code :
    function bind_db_changes(database, callback) {
        $.getJSON("/" + database, function(db) {
            $.getJSON("/"+ database + 
                        "/_changes?since="+ db.update_seq +"&heartbeat=10000&feed=longpoll", 
            function(changes) {
                if($.isFunction(callback)){
                    callback.call(this, changes);
                    bind_db_changes(database, callback);
                }
            }); 
        });
    };

    bind_db_changes("test", function(changes){
        $('ul').append("<li>"+ changes.last_seq +"</li>");
    });
Access Couch DB database URL through rewritten URL, with query parameters

Access Couch DB database URL through rewritten URL, with query parameters


By : andyroo6456
Date : March 29 2020, 07:55 AM
wish helps you I tried to duplicate your problem but it is working. Below is my interaction. (Note, I use the IP address, 127.0.0.1:5984, to ensure no vhost/rewrite problems, then I access the "production" site via localhost:5984.
There is a bug it seems with query parameters being appended to rewrites ending with "..". Instead of rewriting to ../?key=val it writes to ..?key=val which CouchDB does not parse.
code :
{ "from":"/api/*", "to":"../../../*" }
$ mkdir t
$ cd t
$ curl -XDELETE 127.0.0.1:5984/x 
{"ok":true}
$ curl -XPUT 127.0.0.1:5984/x 
{"ok":true}
$ curl 127.0.0.1:5984
{"couchdb":"Welcome","version":"1.0.1"}

$ echo -n _design/test > _id
$ mkdir shows
$ echo 'function() { return "hello world!\n" }' > shows/hello.js
$ cat > rewrites.json
[ { "from":"/db/*", "to":"../../*" }
, { "from":"/*"   , "to":"*"}
]

$ echo '{}' > .couchapprc
$ couchapp push http://127.0.0.1:5984/x
$ curl -XPUT http://127.0.0.1:5984/_config/vhosts/localhost:5984 -d '"/x/_design/test/_rewrite"'
"/x/_design/test/_rewrite"

$ curl localhost:5984 # This is the design document.
{"_id":"_design/test","_rev":"1-e523efd669aa5375e711f8e4b764da7a","shows":{"hello":"function() { return \"hello world!\\n\" }"},"couchapp":{"signatures":{},"objects":{},"manifest":["rewrites.json","shows/","shows/hello.js"]},"rewrites":[{"to":"../../*","from":"/db/*"},{"to":"*","from":"/*"}]}
$ curl localhost:5984/_show/hello
hello world!

$ curl localhost:5984/db # This is the DB.
{"db_name":"x","doc_count":1,"doc_del_count":0,"update_seq":1,"purge_seq":0,"compact_running":false,"disk_size":4185,"instance_start_time":"1298269455135987","disk_format_version":5,"committed_update_seq":1}
$ curl localhost:5984/db/_changes
{"results":[
{"seq":1,"id":"_design/test","changes":[{"rev":"1-e523efd669aa5375e711f8e4b764da7a"}]}
],
"last_seq":1}

$ curl localhost:5984/db/_changes?since=1 # Parameters accepted!
{"results":[

],
"last_seq":1}
Access couch db:s query parameters programmatically

Access couch db:s query parameters programmatically


By : datta sonawane
Date : March 29 2020, 07:55 AM
around this issue MapReduce doesn't work like this.
Map (and reduce) functions are not called at each query for each object. They are called for each updated object (at query time).
How to call different functions based on input parameters and passing parameters

How to call different functions based on input parameters and passing parameters


By : user3572212
Date : March 29 2020, 07:55 AM
I hope this helps . You could call the function inline by adding the parameters afterwards
code :
switch_function("fiqa")(1,2,3)
def exec_function(input_key, *params):
    func_dict = {
        "fog_create_user":fog_create_user,
        "fog_delect_use":fog_delect_user,
        "fog_update_user":fog_update_user,
        "fiqa":fiqa,
        "single_match":single_match,
        "batch_match":batch_match,
        "verify":verify,
        "create_user":create_user,
        "delect_user":delect_user,
        "update_user":update_user
    }
    func = func_dict.get(input_key)
    return func(*params)

exec_function("fiqa",4,5,6)
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