Am Montag, 17. Februar 2014 11:25:46 UTC+1 schrieb ajlopez:
>
> Umm... I don't use CouchDB, nano module. But it looks as a callback
> problem. You are running CouchRead() inmmediately AFTER CouchWrite(), but
> this function has still pending to call its own callbacks.
>
> So, a quick alternative approach (not tested):
>
> var couchdb = require('nano')('http://localhost:5984/');
> var db = couchdb.use('udoodb');
> CouchWrite();
> // CouchRead(); <-- not here
>
>
> function CouchWrite() {
> couchdb.db.destroy('udoodb', function()
> {
> couchdb.db.create('udoodb', function(err) {
> if (err) {throw err; }
> var doc1 = { sw1:false, sw2:false, sw3:false };
> db.insert(doc1,'4662745328718336f506f9d2d3010c0c', function(err) {
> if (err) {throw err; }
>
> // Call CouchRead in the callback of db.insert
> CouchRead();
>
> });
> });
> });
> }
>
> function CouchRead() {
> db.get('4662745328718336f506f9d2d3010c0c', function(err, val) {
> console.log('Switches =', val);
> });
> }
>
>
> A more flexible approach:
>
> var couchdb = require('nano')('http://localhost:5984/');
> var db = couchdb.use('udoodb');
> CouchWrite(CouchRead); // pass CouchRead as the callback of CouchWrite
> // CouchRead(); <-- not here
>
>
> function CouchWrite(cb) {
> couchdb.db.destroy('udoodb', function()
> {
> couchdb.db.create('udoodb', function(err) {
> if (err) {throw err; }
> var doc1 = { sw1:false, sw2:false, sw3:false };
> db.insert(doc1,'4662745328718336f506f9d2d3010c0c', function(err) {
> if (err) {throw err; }
>
> // Call the callback cb
> cb();
>
> });
> });
> });
> }
>
>
> But the preferred Node way is to have callbacks a la function(err, result)
>
>
> var couchdb = require('nano')('http://localhost:5984/');
> var db = couchdb.use('udoodb');
> CouchWrite(CouchRead); // pass CouchRead as the callback of CouchWrite
> // CouchRead(); <-- not here
>
>
> function CouchWrite(cb) {
> couchdb.db.destroy('udoodb', function()
> {
> couchdb.db.create('udoodb', function(err) {
> if (err) {throw err; }
> var doc1 = { sw1:false, sw2:false, sw3:false };
> db.insert(doc1,'4662745328718336f506f9d2d3010c0c', cb);
> });
> });
> }
>
> function CouchRead(err, data) {
> if (err) throw err;
>
> db.get('4662745328718336f506f9d2d3010c0c', function(err, val) {
> console.log('Switches =', val);
> });
> }
>
> Angel "Java" Lopez
> @ajlopez
>
>
>
> On Mon, Feb 17, 2014 at 7:00 AM, Reiko Nötzold
> <[email protected]<javascript:>
> > wrote:
>
>> Hi,
>>
>> i developed in node.js and CouchDB and have a problem with "function" and
>> local/global variables.
>> My Code write and read in CouchDB, is running. But when both
>> CouchWrite(); and CouchRead(); "Switches = undefined"
>> CouchWrite(); "or" CouchRead(); is running.
>>
>>
>> var couchdb = require('nano')('http://localhost:5984/');
>> var db = couchdb.use('udoodb');
>> CouchWrite();
>> CouchRead();
>>
>>
>> function CouchWrite() {
>> couchdb.db.destroy('udoodb', function()
>> {
>> couchdb.db.create('udoodb', function(err) {
>> if (err) {throw err; }
>> var doc1 = { sw1:false, sw2:false, sw3:false };
>> db.insert(doc1,'4662745328718336f506f9d2d3010c0c', function(err) {
>> if (err) {throw err; }
>> });
>> });
>> });
>> }
>>
>> function CouchRead() {
>> db.get('4662745328718336f506f9d2d3010c0c', function(err, val) {
>> console.log('Switches =', val);
>> });
>> }
>>
>> Thanks
>> Reiko
>>
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