问题
I have the following code:
settings.py
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.mysql',
'NAME': 'tectcom',
'USER': 'test',
'PASSWORD': '***146***',
'HOST': '',
'PORT': '',
},
'cdr': {
'ENGINE': 'django.db.backends.mysql',
'NAME': 'ast',
'USER': '123',
'PASSWORD': '654',
'HOST': '',
'PORT': '',
}
views.py
def cdr_user(request):
cursor = connections['cdr'].cursor()
calls = cursor.execute('SELECT * FROM cdr')
return render_to_response("cdr_user.html",
{'result':calls }, context_instance=RequestContext(request))
cdr_user.html
{% for res in result %}
{{ res.billsec }}<br />
{% endfor %}
The table is like that:
+-------------+--------------+------+-----+---------------------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------------+--------------+------+-----+---------------------+-------+
| calldate | datetime | NO | MUL | 0000-00-00 00:00:00 | |
| clid | varchar(80) | NO | | | |
| src | varchar(80) | NO | | | |
| dst | varchar(80) | NO | MUL | | |
| dcontext | varchar(80) | NO | | | |
| channel | varchar(80) | NO | | | |
| dstchannel | varchar(80) | NO | | | |
| lastapp | varchar(80) | NO | | | |
| lastdata | varchar(80) | NO | | | |
| duration | int(11) | NO | | 0 | |
| billsec | int(11) | NO | | 0 | |
| disposition | varchar(45) | NO | | | |
| amaflags | int(11) | NO | | 0 | |
| accountcode | varchar(20) | NO | MUL | | |
| userfield | varchar(255) | NO | | | |
| uniqueid | varchar(32) | NO | | | |
| linkedid | varchar(32) | NO | | | |
| sequence | varchar(32) | NO | | | |
| peeraccount | varchar(32) | NO | | | |
+-------------+--------------+------+-----+---------------------+-------+
The problem is that I get a "Exception Value: 'long' object is not iterable"
TypeError at /cdr_user/
'long' object is not iterable
Request Method: GET
Request URL: http://localhost:8000/cdr_user/
Django Version: 1.4.1
Exception Type: TypeError
Exception Value:
'long' object is not iterable
Exception Location: /usr/local/lib/python2.7/site-packages/django/template/defaulttags.py in render, line 144
Python Executable: /usr/local/bin/python
Python Version: 2.7.0
Python Path:
['/home/tectadmin/cdr/billing',
'/usr/local/lib/python2.7/site-packages/setuptools-0.6c11-py2.7.egg',
'/usr/local/lib/python2.7/site-packages/pip-1.0-py2.7.egg',
'/usr/local/lib/python2.7/site-packages/django_endless_pagination-1.1-py2.7.egg',
'/usr/local/lib/python27.zip',
'/usr/local/lib/python2.7',
'/usr/local/lib/python2.7/plat-linux2',
'/usr/local/lib/python2.7/lib-tk',
'/usr/local/lib/python2.7/lib-old',
'/usr/local/lib/python2.7/lib-dynload',
'/usr/local/lib/python2.7/site-packages']
Server time: Sab, 1 Set 2012 19:56:10 -0300
Error during template rendering
In template /home/tectadmin/cdr/billing/config/templates/cdr_user.html, error at line 21
'long' object is not iterable
11 text-indent: 6em;
12 }
13 </style>
14 {% extends "index_cliente.html" %}
15 {% load endless %}
16 {% block title %}CDR{% endblock %}
17 {% block content %}
18
19
20
21 {% for res in result %}
22
23 {{ res.billsec }}<br />
24
25 {% endfor %}
26
27
28
29
30 <br />
31 <form name="input" action="/user_cdr/" method="et" >
Traceback Switch to copy-and-paste view
/usr/local/lib/python2.7/site-packages/django/core/handlers/base.py in get_response
response = callback(request, *callback_args, **callback_kwargs) ...
▶ Local vars
/home/tectadmin/cdr/billing/config/views.py in cdr_user
{'result':result }, context_instance=RequestContext(request)) ...
▶ Local vars
How do I make result iterable to show it in my template? I've seen https://docs.djangoproject.com/en/dev/topics/db/sql/ and also other documentation, but I'm still lost in the code.
Thank you.
回答1:
To iterate over the result of a SQL query in Python, use cursor.fetchall() to turn it into a list of lists. There's a very handy recipe here for turning those results into an object you can easily access:
class SQLRow(object):
def __init__(self, cursor, row):
for (attr, val) in zip((d[0] for d in cursor.description), row) :
setattr(self, attr, val)
Once you have that class, this is simple:
def cdr_user(request):
cursor = connections['cdr'].cursor()
calls = cursor.execute('SELECT * FROM cdr')
result = [SQLRow(cursor, r) for r in cursor.fetchall()]
return render_to_response("cdr_user.html",
{'result': result }, context_instance=RequestContext(request))
This way, the billsec attribute (and all other attributes) will still be accessible in your template.
回答2:
cursor.execute() doesn't return an iterable. It modifies the cursor object in place. Here's some documentation on this.
You need to call .fetchone() .fetchmany() or .fetchall() to retrieve the results, which should be iterables, e.g.:
def cdr_user(request):
cursor = connections['cdr'].cursor()
cursor.execute('SELECT * FROM cdr')
calls = cursor.fetchall()
return render_to_response("cdr_user.html",
{'result':calls },
context_instance=RequestContext(request))
来源：https://stackoverflow.com/questions/12232244/how-to-make-an-external-database-query-iterable