Wie füttere ich (Postgresql) Daten in GTK-Eingabefelder?

Question

Der Versuch, ein Python 3-Programm zum Anzeigen und Bearbeiten von Daten aus einer Postgresql-Datenbank einzurichten. Der angehängte Code ist ein vereinfachtes "hartcodiertes" Beispiel dessen, was ich versuche (tatsächlich mit einer äquivalenten Gtk.Builder-Konstruktion.) Ohne die Anweisung "set_text" wird das Vcard-Fenster genau so angezeigt, wie ich es möchte.

Hier ist die Trace-Back:

$ python3 Q1.py 
Database connection closed. 
Record(vindex=5, prefix='Mrs D ', firstname='Nona', addnlnames=None, surname='***', suffix=None, nickname=None, kind='private', bday=None, anniversary=None, gender=None, workpobox=None, workaddr2=None, workaddr=None, workcity=None, workstate=None, workpostcode=None, workcountry=None, homepobox=None, homeaddr2=None, homeaddr='********', homecity='****', homestate=None, homepostcode='BT** ***', homecountry='N Ireland', worktel=None, hometel='02870 ******', faxtel=None, pagertel=None, mobiletel='07931 ******', email1=None, email2=None, title=None, workrole=None, workdept=None, workorg=None, rev=None, notes=None, webpage=None, orgwebpage=None) 
Traceback (most recent call last): 
    File "Q1.py", line 92, in <module> 
    y = displaydata(x) 
    File "Q1.py", line 81, in displaydata 
    Vcard.prefixentry.set_text(xstr(c['prefix'])) 
AttributeError: type object 'Vcard' has no attribute 'prefixentry' 

Hier ist der Code:

#!/usr/bin/python3 

import sys 
from collections import deque 
import psycopg2 
import psycopg2.extras 
from outputvcard import * 
import gi 
gi.require_version('Gtk', '3.0') 
from gi.repository import Gtk 

c = {} 
version = "2.1" 
buffer = deque([]) 
lastname = "Bell" 

def readacard(lastname, cc): 
    conn = psycopg2.connect("dbname='contacts' user='postgres'") 
    cur = conn.cursor(cursor_factory = psycopg2.extras.NamedTupleCursor) 
    cur.execute("SELECT * from vcardata where surname = %s", [lastname]) 
    cc = cur.fetchone() 
    cur.close() 
    conn.close() 
    print('Database connection closed.') 
    return cc; 

class Vcardclass(Gtk.ApplicationWindow): 
    def __init__(self, app): 
     Gtk.Window.__init__(self, title="Vcard editor", application=app) 
     self.set_title("Vcard editor") 
     self.set_default_size(300, 600) 
     self.connect("destroy", Gtk.main_quit) 
     self.vbox = Gtk.Box(orientation=Gtk.Orientation.VERTICAL, spacing=6) 
     self.add(self.vbox) 
     self.swin = Gtk.ScrolledWindow(expand=True) 
     self.swin.set_policy(Gtk.PolicyType.ALWAYS, Gtk.PolicyType.ALWAYS) 
     self.swin.set_vadjustment 
     self.vbox.add(self.swin) 
     self.grid = Gtk.Grid(orientation=Gtk.Orientation.VERTICAL) 
     self.swin.add(self.grid) 

     self.prefixlabel = Gtk.Label("Prefix") 
     self.prefixentry = Gtk.Entry() 
     self.grid.attach(self.prefixlabel, 0, 0, 1, 1) 
     self.grid.attach(self.prefixentry, 1, 0, 1, 1) 
     self.prefixentry.set_text(xstr(c['prefix'])) 

     self.firstnamelabel = Gtk.Label("First name") 
     self.firstnameentry = Gtk.Entry() 
     self.grid.attach_next_to(self.firstnamelabel, self.prefixlabel, Gtk.PositionType.BOTTOM, 1,1) 
     self.grid.attach_next_to(self.firstnameentry, self.prefixentry, Gtk.PositionType.BOTTOM, 1,1) 
""" 
lots more like that 
""" 


class Vcard(Gtk.Application): 
    def __init__(self): 
     Gtk.Application.__init__(self) 

    def do_activate(self): 
     window = Vcardclass(self) 
     window.show_all() 

    def do_startup(self): 
     Gtk.Application.do_startup(self) 

app = Vcard() 

def xstr(s): 
    if s is None: 
     return '' 
    else: 
     return s 

def displaydata(c): 
    print (c) 
    Vcard.prefixentry.set_text(xstr(c['prefix'])) 
    Vcard.firstnameentry.set_text(xstr(c['firstname'])) 
""" 
lots more like that 
""" 




x = readacard(lastname, c) 
#print (x) 
y = displaydata(x) 
x = outcard(version, c, buffer) 
i = len(buffer) 
outfile = 'out.vcf' 
f = open(outfile, 'w') 
while i > 0: 
    f.write(buffer.popleft() + "\n") 
    i = i - 1 
    f.close 

exit_status = app.run(sys.argv) 
sys.exit(exit_status) 

Vielen Dank für Ihre Eingabe Graeme

Answer 1

Hier ist eine einfache Anwendung, die Sie zu erhalten begonnen .

Python:

import gi 
gi.require_version('Gtk', '3.0') 
from gi.repository import Gtk, GdkPixbuf, Gdk 
import os, sys, psycopg2 

class GUI: 
    def __init__(self): 

     self.builder = Gtk.Builder() 
     self.builder.add_from_file('app.ui') 
     self.builder.connect_signals(self) 

     try: 
      conn = psycopg2.connect("dbname='contacts' user='postgres'") 
      self.cur = conn.cursor(cursor_factory = psycopg2.extras.NamedTupleCursor) 
     except Exception, e: 
      print e 

     window = self.builder.get_object('window') 
     window.show_all() 

    def on_window_destroy(self, window): 
     Gtk.main_quit() 

    def button_clicked (self, button): 
     self.cur.execute("SELECT * from vcardata where surname = %s", [lastname]) 
     cc = self.cur.fetchone()[0] 
     self.builder.get_object('entry1').set_text(str(cc)) 

def main(): 
    app = GUI() 
    Gtk.main() 

if __name__ == "__main__": 
    sys.exit(main()) 

Glade-Datei mit dem Namen app.ui:

<?xml version="1.0" encoding="UTF-8"?> 
<!-- Generated with glade 3.18.3 --> 
<interface> 
    <requires lib="gtk+" version="3.0"/> 
    <object class="GtkWindow" id="window"> 
    <property name="visible">True</property> 
    <property name="can_focus">False</property> 
    <property name="title" translatable="yes">window</property> 
    <property name="default_width">500</property> 
    <property name="default_height">400</property> 
    <signal name="destroy" handler="on_window_destroy" swapped="no"/> 
    <child> 
     <object class="GtkBox" id="box1"> 
     <property name="visible">True</property> 
     <property name="can_focus">False</property> 
     <property name="orientation">vertical</property> 
     <child> 
      <object class="GtkEntry" id="entry1"> 
      <property name="visible">True</property> 
      <property name="can_focus">True</property> 
      </object> 
      <packing> 
      <property name="expand">False</property> 
      <property name="fill">True</property> 
      <property name="position">0</property> 
      </packing> 
     </child> 
     <child> 
      <object class="GtkButton" id="button1"> 
      <property name="label" translatable="yes">Click here to run SQL command</property> 
      <property name="visible">True</property> 
      <property name="can_focus">True</property> 
      <property name="receives_default">True</property> 
      <signal name="clicked" handler="button_clicked" swapped="no"/> 
      </object> 
      <packing> 
      <property name="expand">False</property> 
      <property name="fill">True</property> 
      <property name="position">1</property> 
      </packing> 
     </child> 
     </object> 
    </child> 
    </object> 
</interface> 

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