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]> 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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