Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <blockquote> <p>How can I make callbacks outside the class?</p> </blockquote> <p>This sounds like a very common misunderstanding. As a result of the misunderstanding, the question, as asked, doesn't make a lot of sense. So let's forget about the question.</p> <p>You already have some code that's using Deferreds. Let's start with <code>mainmyServ</code>:</p> <pre><code>def mainmyServ(self): # print "Client ID is: " + self.myServID # Joining Chat s1= DeferredList([client.getPage(self.myServServer+"/chat/", headers={'Content-Type': 'application/x-www-form-urlencoded'}, method="POST", postdata="action=join&amp;user=%s&amp;message=null" % self.myServID),]) s1.addCallback(self.connectedtomyServService) s1.addErrback(self.error) </code></pre> <p>First, you can get rid of the <code>DeferredList</code>. Your list only has one <code>Deferred</code> in it, so the <code>DeferredList</code> isn't adding any value. You'll get practically the same behavior like this, and your callbacks can be simplified by removing all of the <code>[0][0]</code> expressions.</p> <pre><code>def mainmyServ(self): # print "Client ID is: " + self.myServID # Joining Chat s1= client.getPage(self.myServServer+"/chat/", headers={'Content-Type': 'application/x-www-form-urlencoded'}, method="POST", postdata="action=join&amp;user=%s&amp;message=null" % self.myServID) s1.addCallback(self.connectedtomyServService) s1.addErrback(self.error) </code></pre> <p>So this is a perfectly reasonable method which is calling a function that returns a Deferred and then adding a callback and an errback to that Deferred. Say you have another function, perhaps your overall main function:</p> <pre><code>def main(): service = ChatService() service.mainmyServ() </code></pre> <p>What prevents the <code>main</code> function from adding more callbacks to the <code>Deferred</code> in <code>mainmyServ</code>? Only that <code>mainmyServ</code> doesn't bother to return it. So:</p> <pre><code>def mainmyServ(self): # print "Client ID is: " + self.myServID # Joining Chat s1= client.getPage(self.myServServer+"/chat/", headers={'Content-Type': 'application/x-www-form-urlencoded'}, method="POST", postdata="action=join&amp;user=%s&amp;message=null" % self.myServID) s1.addCallback(self.connectedtomyServService) s1.addErrback(self.error) return s1 def main(): service = ChatService() d = service.mainmyServ() d.addCallback(doSomethingElse) </code></pre> <p>Nothing special there, it's just another <code>addCallback</code>. All you were missing was a reference to the <code>Deferred</code>.</p> <p>You can set up your loop now, by having <code>doSomethingElse</code> call another method on <code>ChatService</code>. If that other method returns a <code>Deferred</code>, then <code>doSomethingElse</code> can add a callback to it that calls <code>mainmyServ</code> again. And so on. There's your loop, controlled "outside" of the class.</p>
    singulars
    1. This table or related slice is empty.
    1. POtwisted web getPage, 2 clients in 2 classes, manage events between the two
      singulars
      1. PTQuestion
    1. PTAnswer
    1. This table or related slice is empty.
    1. USJean-Paul Calderone
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POtwisted web getPage, 2 clients in 2 classes, manage events between the two
      singulars
      1. PTQuestion
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTAcceptedByOriginator
    3. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. COThis is really nice, thanks for all the time spent in writing this, i have to go now but as soon as i come home i'll try :D anyways, the reason i am adding deferredLists is because somehow callbacks won't work if they are set alone!! i have noi idea why. Tell you after how it goes Thanks again
      singulars
      1. PO
      1. USPirosB3
    2. COThanks! This helped a lot!
      singulars
      1. PO
      1. USPirosB3
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload