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0#翻译 =================== web2py Examples =================== =================== web2py 示例 =================== 896天前 翻译
1#翻译 created by Massimo Di Pierro 由 Massimo Di Pierro 创建 798天前 翻译
2#翻译 Simple Examples ---------------- 简单的几个例子 ---------------- 334天前 翻译
3#翻译 Here are some working and complete examples that explain the basic syntax of the framework. You can click on the web2py keywords (in the highlighted code!) to get documentation. 这里有一些完整并可以运行的例子用以熟悉Web2py框架的基本语法. 您可以点击web2py的关键字(在代码的高亮部分)来查看相关文档. 593天前 翻译
4#翻译 Example 1 ~~~~~~~~~ 例子 1 404天前 翻译
5#翻译 In controller: simple_examples.py :: def hello1(): return "Hello World" 翻译 899天前 翻译
6#翻译 If the controller function returns a string, that is the body of the rendered page. 翻译 899天前 翻译
7#翻译 Example 2 ~~~~~~~~~~ 例子 2 334天前 翻译
8#翻译 In controller: simple_examples.py :: def hello2(): return T("Hello World") 翻译 899天前 翻译
9#翻译 The function T() marks strings that need to be translated. Translation dictionaries can be created at /admin/default/design 翻译 899天前 翻译
10#翻译 Example 3 ~~~~~~~~~ 例子 3 334天前 翻译
11#翻译 In controller: simple_examples.py :: def hello3(): return dict(message=T("Hello World")) 翻译 899天前 翻译
12#翻译 and view: simple_examples/hello3.html .. syntax:: html :: {{extend 'layout.html'}} <h1>{{=message}}</h1> .. syntax:: python 翻译 899天前 翻译
13#翻译 If you return a dictionary, the variables defined in the dictionery are visible to the view (template). 翻译 899天前 翻译
14#翻译 Example 4 ~~~~~~~~~~ 翻译 899天前 翻译
15#翻译 In controller: simple_examples.py :: def hello4(): response.view='simple_examples/hello3.html' return dict(message=T("Hello World")) 翻译 899天前 翻译
16#翻译 You can change the view, but the default is /[controller]/[function].html. If the default is not found web2py tries to render the page using the generic.html view. 翻译 899天前 翻译
17#翻译 Example 5 ~~~~~~~~~ 翻译 899天前 翻译
18#翻译 In controller: simple_examples.py :: def hello5(): return HTML(BODY(H1(T('Hello World'),_style="color: red;"))).xml() 翻译 899天前 翻译
19#翻译 You can also generate HTML using helper objects HTML, BODY, H1, etc. Each of these tags is an class and the views know how to render the corresponding objects. The method .xml() serializes them and produce html/xml code for the page. Each tag, DIV for example, takes three types of arguments: 翻译 899天前 翻译
20#翻译 * unnamed arguments, they correspond to nested tags * named arguments and name starts with '_'. These are mapped blindly into tag attributes and the '_' is removed. attributes without value like "READONLY" can be created with the argument "_readonly=ON". * named arguments and name does not start with '_'. They have a special meaning. See "value=" for INPUT, TEXTAREA, SELECT tags later. 翻译 899天前 翻译
21#翻译 Example 6 ~~~~~~~~~~ 翻译 899天前 翻译
22#翻译 In controller: simple_examples.py :: def status(): return dict(request=request,session=session,response=response) 翻译 899天前 翻译
23#翻译 Here we are showing the request, session ad response objects using the generic.html template. 翻译 899天前 翻译
24#翻译 Example 7 ~~~~~~~~~ 翻译 899天前 翻译
25#翻译 In controller: simple_examples.py :: def redirectme(): redirect(URL(r=request,f='hello3')) 翻译 899天前 翻译
26#翻译 You can do redirect. 翻译 899天前 翻译
27#翻译 Example 8 ~~~~~~~~~~ 翻译 899天前 翻译
28#翻译 In controller: simple_examples.py :: def raisehttp(): raise HTTP(400,"internal error") 翻译 899天前 翻译
29#翻译 You can raise HTTP exceptions to return an error page. 翻译 899天前 翻译
30#翻译 Example 9 ~~~~~~~~~~ 翻译 899天前 翻译
31#翻译 In controller: simple_examples.py :: 1 def raiseexception(): 1/0 return 'oops' 翻译 899天前 翻译
32#翻译 If an exception occurs (other than HTTP) a ticket is generated and the event is logged for the administrator. These tickets and logs can be accessed, reviewed and deleted and any later time. 翻译 899天前 翻译
33#翻译 Example 10 ~~~~~~~~~~ 翻译 899天前 翻译
34#翻译 In controller: simple_examples.py :: def servejs(): import gluon.contenttype response.headers['Content-Type']=\ gluon.contenttype.contenttype('.js') return 'alert("This is a Javascript document");' 翻译 899天前 翻译
35#翻译 You can serve other than HTML pages by changing the contenttype via the response.headers. The gluon.contenttype module can help you figure the type of the file to be server. NOTICE: this is not necessary for static files unless you want to require authorization. 翻译 899天前 翻译
36#翻译 Example 11 ~~~~~~~~~~ 翻译 899天前 翻译
37#翻译 In controller: simple_examples.py :: def makejson(): import gluon.contrib.simplejson as sj return sj.dumps(['foo', {'bar': ('baz', None, 1.0, 2)}]) 翻译 899天前 翻译
38#翻译 If you are into Ajax, web2py includes gluon.contrib.simplejson, developed by Bob Ippolito. This module provides a fast and easy way to serve asynchronous content to your Ajax page. gluon.simplesjson.dumps(...) can serialize most Python types into JSON. gluon.contrib.simplejson.loads(...) performs the reverse operation. 翻译 899天前 翻译
39#翻译 Example 12 ~~~~~~~~~~ 翻译 899天前 翻译
40#翻译 In controller: simple_examples.py :: def makertf(): import gluon.contrib.pyrtf as q doc=q.Document() section=q.Section() doc.Sections.append(section) section.append('Section Title') section.append('web2py is great. '*100) response.headers['Content-Type']='text/rtf' return q.dumps(doc) 翻译 899天前 翻译
41#翻译 web2py also includes gluon.contrib.pyrtf, developed by Simon Cusack and revised by Grant Edwards. This module allows you to generate Rich Text Format documents including colored formatted text and pictures. 翻译 899天前 翻译
42#翻译 Example 13 ~~~~~~~~~~ 翻译 899天前 翻译
43#翻译 In controller: simple_examples.py :: def rss_aggregator(): import datetime import gluon.contrib.rss2 as rss2 import gluon.contrib.feedparser as feedparser d = feedparser.parse("http://rss.slashdot.org/Slashdot/slashdot/to") rss = rss2.RSS2(title=d.channel.title, link = d.channel.link, description = d.channel.description, lastBuildDate = datetime.datetime.now(), items = [ rss2.RSSItem( title = entry.title, link = entry.link, description = entry.description, # guid = rss2.Guid('unkown'), pubDate = datetime.datetime.now()) for entry in d.entries] ) response.headers['Content-Type']='application/rss+xml' return rss2.dumps(rss) 翻译 899天前 翻译
44#翻译 web2py includes gluon.contrib.rss2, developed by Dalke Scientific Software, which generates RSS2 feeds, and gluon.contrib.feedparser, developed by Mark Pilgrim, which collects RSS and ATOM feeds. The above controller collects a slashdot feed and makes new one. 翻译 899天前 翻译
45#翻译 Example 14 ~~~~~~~~~~~ 翻译 899天前 翻译
46#翻译 In controller: simple_examples.py :: from gluon.contrib.markdown import WIKI def ajaxwiki(): form=FORM(TEXTAREA(_id='text'),INPUT(_type='button',_value='markdown', _onclick="ajax('ajaxwiki_onclick',['text'],'html')")) return dict(form=form,html=DIV(_id='html')) def ajaxwiki_onclick(): return WIKI(request.vars.text).xml() 翻译 899天前 翻译
47#翻译 web2py also includes gluon.contrib.markdown (markdown2) which converts WIKI markup to HTML following this syntax. In this example we added a fancy ajax effect. 翻译 899天前 翻译
48#翻译 Session Examples ---------------- 翻译 899天前 翻译
49#翻译 Example 15 ~~~~~~~~~~ 翻译 899天前 翻译
50#翻译 In controller: session_examples.py :: def counter(): if not session.counter: session.counter=0 session.counter+=1 return dict(counter=session.counter) 翻译 899天前 翻译
51#翻译 and view: session_examples/counter.html .. syntax:: python :: {{extend 'layout.html'}} <h1>session counter</h1> <h2>{{for i in range(counter):}}{{=i}}...{{pass}}</h2> <a href="{{=URL(r=request)}}">click me to count</a> .. syntax:: python 翻译 899天前 翻译
52#翻译 Click to count. The session.counter is persistent for this user and application. Every applicaiton within the system has its own separate session management. 翻译 899天前 翻译
53#翻译 Template Examples ----------------- 翻译 899天前 翻译
54#翻译 Example 16 ~~~~~~~~~~ 翻译 899天前 翻译
55#翻译 In controller: template_examples.py :: def variables(): return dict(a=10, b=20) 翻译 899天前 翻译
56#翻译 and view: template_examples/variables.html .. syntax:: html :: {{extend 'layout.html'}} <h1>Your variables</h1> <h2>a={{=a}}</h2> <h2>a={{=b}}</h2> .. syntax:: python 翻译 899天前 翻译
57#翻译 A view (also known as template) is just an HTML file with {{...}} tags. You can put ANY python code into the tags, no need to indent but you must use pass to close blocks. The view is transformed into a python code and then executed. {{=a}} prints a.xml() or escape(str(a)). 翻译 899天前 翻译
58#翻译 Example 17 ~~~~~~~~~~ 翻译 899天前 翻译
59#翻译 In controller: template_examples.py :: def test_for(): return dict() 翻译 899天前 翻译
60#翻译 and view: template_examples/test_for.html .. syntax:: html :: <h1>For loop</h1> {{for number in ['one','two','three']:}} <h2>{{=number.capitalize()}}<h2> {{pass}} .. syntax:: python 翻译 899天前 翻译
61#翻译 You can do for and while loops. 翻译 899天前 翻译
62#翻译 Example 18 ~~~~~~~~~~ 翻译 899天前 翻译
63#翻译 In controller: template_examples.py :: def test_if(): return dict() 翻译 899天前 翻译
64#翻译 and view: template_examples/test_if.html .. syntax:: html :: {{extend 'layout.html'}} <h1>If statement</h1> {{a=10}} {{if a%2==0:}} <h2>{{=a}} is even</h2> {{else:}} <h2>{{=a}} is odd</h2> {{pass}} .. syntax:: python 翻译 899天前 翻译
65#翻译 You can do if, elif, else. 翻译 899天前 翻译
66#翻译 Example 19 ~~~~~~~~~~ 翻译 899天前 翻译
67#翻译 In controller: template_examples.py :: def test_try(): return dict() 翻译 899天前 翻译
68#翻译 and view: template_examples/test_try.html .. syntax:: html :: {{extend 'layout.html'}} <h1>Try... except</h1> {{try:}} <h2>a={{=1/0}}</h2> {{except:}} infinity</h2> {{pass}} .. syntax:: python 翻译 899天前 翻译
69#翻译 You can do try, except, finally. 翻译 899天前 翻译
70#翻译 Example 20 ~~~~~~~~~~ 翻译 899天前 翻译
71#翻译 In controller: template_examples.py :: def test_def(): return dict() 翻译 899天前 翻译
72#翻译 and view: template_examples/test_def.html .. syntax:: html :: {{extend 'layout.html'}} {{def itemlink(name):}}<li>{{=A(name,_href=name)}}</li>{{return}} <ul> {{itemlink('http://www.google.com')}} {{itemlink('http://www.yahoo.com')}} {{itemlink('http://www.nyt.com')}} </ul> .. syntax:: python 翻译 899天前 翻译
73#翻译 You can write functions in HTML too. 翻译 899天前 翻译
74#翻译 Example 21 ~~~~~~~~~~ 翻译 899天前 翻译
75#翻译 In controller: template_examples.py :: def escape(): return dict(message='<h1>text is scaped</h1>') 翻译 899天前 翻译
76#翻译 and view: template_examples/escape.html .. syntax:: html :: {{extend 'layout.html'}} <h1>Strings are automatically escaped</h1> <h2>Message is</h2> {{=message}} .. syntax:: python 翻译 899天前 翻译
77#翻译 The argument of {{=...}} is always escaped unless it is an object with a .xml() method such as link, A(...), a FORM(...), a XML(...) block, etc. 翻译 899天前 翻译
78#翻译 Example 22 ~~~~~~~~~~ 翻译 899天前 翻译
79#翻译 In controller: template_examples.py :: def xml(): return dict(message=XML('<h1>text is not escaped</h1>')) 翻译 899天前 翻译
80#翻译 and view: template_examples/xml.html .. syntax:: html :: {{extend 'layout.html'}} <h1>XML</h1> <h2>Message is</h2> {{=message}} .. syntax:: python 翻译 899天前 翻译
81#翻译 If you do not want to esacpe the argument of {{=...}} mark it as XML. 翻译 899天前 翻译
82#翻译 Example 23 ~~~~~~~~~~ 例子 23 ~~~~~~~~~~ 179天前 翻译
83#翻译 In controller: template_examples.py :: def beautify(): return dict(message=BEAUTIFY(request)) 翻译 899天前 翻译
84#翻译 and view: template_examples/beautify.html .. syntax:: html :: {{extend 'layout.html'}} <h1>BEAUTIFY</h1> <h2>Message is</h2> {{=message}} .. syntax:: python 翻译 899天前 翻译
85#翻译 You can use BEUTIFY to turn lists and dictionaries into organized HTML. 翻译 899天前 翻译
86#翻译 Layout Examples ---------------- 翻译 899天前 翻译
87#翻译 Example 24 ~~~~~~~~~~ 翻译 899天前 翻译
88#翻译 In controller: layout_examples.py :: def civilized(): response.menu=[['civilized',True,URL(r=request,f='civilized')], ['slick',False,URL(r=request,f='slick')], ['basic',False,URL(r=request,f='basic')]] response.flash='you clicked on civilized' return dict(message="you clicked on civilized") 翻译 899天前 翻译
89#翻译 and view: layout_examples/civilized.html .. syntax:: html :: {{extend 'layout_examples/layout_civilized.html'}} <h2>{{=message}}</h2> <p>{{for i in range(1000):}}bla {{pass}}</p> .. syntax:: python 翻译 899天前 翻译
90#翻译 You can specify the layout file at the top of your view. civilized Layout file is a view that somewhere in the body contains {{include}}. 翻译 899天前 翻译
91#翻译 Example 25 ~~~~~~~~~~ 翻译 899天前 翻译
92#翻译 In controller: layout_examples.py :: def slick(): response.menu=[['civilized',False,URL(r=request,f='civilized')], ['slick',True,URL(r=request,f='slick')], ['basic',False,URL(r=request,f='basic')]] response.flash='you clicked on slick' return dict(message="you clicked on slick") 翻译 899天前 翻译
93#翻译 and view: layout_examples/slick.html .. syntax:: html :: {{extend 'layout_examples/layout_sleek.html'}} <h2>{{=message}}</h2> {{for i in range(1000):}}bla {{pass}} .. syntax:: python 翻译 899天前 翻译
94#翻译 Same here, but using a different template. 翻译 899天前 翻译
95#翻译 Example 26 ~~~~~~~~~~ 翻译 899天前 翻译
96#翻译 In controller: layout_examples.py :: def basic(): response.menu=[['civilized',False,URL(r=request,f='civilized')], ['slick',False,URL(r=request,f='slick')], ['basic',True,URL(r=request,f='basic')]] response.flash='you clicked on basic' return dict(message="you clicked on basic") 翻译 899天前 翻译
97#翻译 and view: layout_examples/basic.html .. syntax:: html :: {{extend 'layout.html'}} <h2>{{=message}}</h2> {{for i in range(1000):}}bla {{pass}} .. syntax:: python 翻译 899天前 翻译
98#翻译 'layout.html' is the default template, every applicaiton has a copy of it. 翻译 899天前 翻译
99#翻译 Form Examples -------------- 翻译 899天前 翻译
100#翻译 Example 27 ~~~~~~~~~~ 翻译 899天前 翻译
101#翻译 In controller: form_examples.py :: def form(): form=FORM(TABLE(TR("Your name:",INPUT(_type="text",_name="name", requires=IS_NOT_EMPTY())), TR("Your email:",INPUT(_type="text",_name="email", requires=IS_EMAIL())), TR("Admin",INPUT(_type="checkbox",_name="admin")), TR("Sure?",SELECT('yes','no',_name="sure", requires=IS_IN_SET(['yes','no']))), TR("Profile",TEXTAREA(_name="profile", value="write something here")), TR("",INPUT(_type="submit",_value="SUBMIT")))) if form.accepts(request.vars,session): response.flash="form accepted!" else: response.flash="form is invalid!" return dict(form=form,vars=form.vars) 翻译 899天前 翻译
102#翻译 You can use HTML helpers like FORM, INPUT, TEXTAREA, OPTION, SELECT to build forms. the "value=" attribute sets the initial value of the field (works for TEXTAREA and OPTION/SELECT too) and the requires attribute sets the validators. FORM.accepts(..) trys to validate the form and, on success, stores vars into form.vars. On failure the error messages are stored into form.errors and shown in the form. 翻译 899天前 翻译
103#翻译 Database Examples ----------------- 翻译 899天前 翻译
104#翻译 You can find more examples of the web2py ORM here 翻译 899天前 翻译
105#翻译 Let's create a simple model with users, dogs, products and purchases (the database of an animal store). Users can have many dogs (ONE TO MANY), can buy many producs and every product can have many buyers (MANY TO MANY). 翻译 899天前 翻译
106#翻译 Example 28 ~~~~~~~~~~ 翻译 899天前 翻译
107#翻译 in model: dba.py :: dba=SQLDB('sqlite://tests.db') dba.define_table('users', SQLField('name'), SQLField('email')) # ONE (users) TO MANY (dogs) dba.define_table('dogs', SQLField('owner_id',dba.users), SQLField('name'), SQLField('type'), SQLField('vaccinated','boolean',default=False), SQLField('picture','upload',default='')) dba.define_table('products', SQLField('name'), SQLField('description','blob')) # MANY (users) TO MANY (products) dba.define_table('purchases', SQLField('buyer_id',dba.users), SQLField('product_id',dba.products), SQLField('quantity','integer')) purchased=((dba.users.id==dba.purchases.buyer_id)&(dba.products.id==dba.purchases.product_id)) dba.users.name.requires=IS_NOT_EMPTY() dba.users.email.requires=[IS_EMAIL(), IS_NOT_IN_DB(dba,'users.email')] dba.dogs.owner_id.requires=IS_IN_DB(dba,'users.id','users.name') dba.dogs.name.requires=IS_NOT_EMPTY() dba.dogs.type.requires=IS_IN_SET(['small','medium','large']) dba.purchases.buyer_id.requires=IS_IN_DB(dba,'users.id','users.name') dba.purchases.product_id.requires=IS_IN_DB(dba,'products.id','products.name') dba.purchases.quantity.requires=IS_INT_IN_RANGE(0,10) 翻译 899天前 翻译
108#翻译 Tables are created if they do not exist (try... except). Here "purchased" is an SQLQuery object, "dba(purchased)" would be a SQLSet obejcts. A SQLSet object can be selected, updated, deleted. SQLSets can also be intersected. Allowed field types are string, integer, password, text, blob, upload, date, time, datetime, references(*), and id(*). The id field is there by default and must not be declared. references are for one to many and many to many as in the example above. For strings you should specify a length or you get length=32. 翻译 899天前 翻译
109#翻译 You can use dba.tablename.fieldname.requires= to set restrictions on the field values. These restrictions are automatically converted into widgets when generating forms from the table with SQLFORM(dba.tablename). 翻译 899天前 翻译
110#翻译 define_tables creates the table and attempts a migration if table has changed or if database name has changed since last time. If you know you already have the table in the database and you do not want to attemt a migration add one last argument to define_table migrate=False. 翻译 899天前 翻译
111#翻译 Example 29 ~~~~~~~~~~ 翻译 899天前 翻译
112#翻译 In controller: database_examples.py :: response.menu=[['Register User',False,URL(r=request,f='register_user')], ['Register Dog',False,URL(r=request,f='register_dog')], ['Register Product',False,URL(r=request,f='register_product')], ['Buy product',False,URL(r=request,f='buy')]] def register_user(): ### create an insert form from the table form=SQLFORM(dba.users) ### if form correct perform the insert if form.accepts(request.vars,session): response.flash='new record inserted' ### and get a list of all users records=SQLTABLE(dba().select(dba.users.ALL)) return dict(form=form,records=records) 翻译 899天前 翻译
113#翻译 and view: database_examples/register_user.html .. syntax:: html :: {{extend 'layout_examples/layout_civilized.html'}} <h1>User registration form</h1> {{=form}} <h2>Current users</h2> {{=records}} .. syntax:: python 翻译 899天前 翻译
114#翻译 This is a simple user registration form. SQLFORM takes a table and returns the corresponding entry form with validators, etc. SQLFORM.accepts is similar to FORM.accepts but, if form is validated, the corresponding insert is also performed. SQLFORM can also do update and edit if a record is passed as its second argument. SQLTABLE instead turns a set of records (result of a select) into an HTML table with links as specified by its optional parameters. The response.menu on top is just a variable used by the layout to make the navigation menu for all functions in this controller. 翻译 899天前 翻译
115#翻译 Example 30 ~~~~~~~~~~ 翻译 899天前 翻译
116#翻译 In controller: database_examples.py :: def register_dog(): form=SQLFORM(dba.dogs) if form.accepts(request.vars,session): response.flash='new record inserted' download=URL(r=request,f='download') # to see the picture records=SQLTABLE(dba().select(dba.dogs.ALL),upload=download) return dict(form=form,records=records) 翻译 899天前 翻译
117#翻译 and view: database_examples/register_dog.html .. syntax:: html :: {{extend 'layout_examples/layout_civilized.html'}} <h1>Dog registration form</h1> {{=form}} <h2>Current dogs</h2> {{=records}} .. syntax:: python 翻译 899天前 翻译
118#翻译 Here is a dog registration form. Notice that the "image" (type "upload") field is rendered into a <INPUT type="file"> html tag. SQLFORM.accepts(...) handles the upload of the file into the uploads/ folder. 翻译 899天前 翻译
119#翻译 Example 31 ~~~~~~~~~~ 翻译 899天前 翻译
120#翻译 In controller: database_examples.py :: def register_product(): form=SQLFORM(dba.products) if form.accepts(request.vars,session): response.flash='new record inserted' records=SQLTABLE(dba().select(dba.products.ALL)) return dict(form=form,records=records) 翻译 899天前 翻译
121#翻译 and view: database_examples/register_product.html .. syntax:: html :: {{extend 'layout_examples/layout_civilized.html'}} <h1>Product registration form</h1> {{=form}} <h2>Current products</h2> {{=records}} .. syntax:: python 翻译 899天前 翻译
122#翻译 Nothing new here. 翻译 899天前 翻译
123#翻译 Example 32 ~~~~~~~~~~ 翻译 899天前 翻译
124#翻译 In controller: database_examples.py :: def buy(): form=FORM(TABLE(TR("Buyer id:",INPUT(_type="text", _name="buyer_id",requires=IS_NOT_EMPTY())), TR("Product id:",INPUT(_type="text", _name="product_id",requires=IS_NOT_EMPTY())), TR("Quantity:",INPUT(_type="text", _name="quantity",requires=IS_INT_IN_RANGE(1,100))), TR("",INPUT(_type="submit",_value="Order")))) if form.accepts(request.vars,session): ### check if user is in the database if len(dba(dba.users.id==form.vars.buyer_id).select())==0: form.errors.buyer_id="buyer not in database" ### check if product is in the database if len(dba(dba.products.id==form.vars.product_id)\ .select())==0: form.errors.product_id="product not in database" ### if no errors if len(form.errors)==0: ### get a list of same purchases by same user purchases=dba( (dba.purchases.buyer_id==form.vars.buyer_id)& (dba.purchases.product_id==form.vars.product_id)\ ).select() ### if list contains a record, update that record if len(purchases)>0: purchases[0].update_record(quantity=\ purchases[0].quantity+form.vars.quantity) ### or insert a new record in table else: dba.purchases.insert(buyer_id=form.vars.buyer_id, product_id=form.vars.product_id, quantity=form.vars.quantity) response.flash="product purchased!" if len(form.errors): response.flash="invalid valus in form!" ### now get a list of all purchases records=dba(purchased).select(dba.users.name, \ dba.purchases.quantity,dba.products.name) return dict(form=form,records=SQLTABLE(records), vars=form.vars,vars2=request.vars) 翻译 899天前 翻译
125#翻译 and view: database_examples/buy.html .. syntax:: html :: {{extend 'layout_examples/layout_civilized.html'}} <h1>Purchase form</h1> {{=form}} [ {{=A('reset purchased',_href=URL(r=request,f='reset_purchased'))}} | {{=A('delete purchased', _href=URL(r=request,f='delete_purchased'))}} ]<br/> <h2>Current purchases (SQL JOIN!)</h2> <p>{{=records}}</p> .. syntax:: python 翻译 899天前 翻译
126#翻译 Here is a rather sophisticated buy form. It checks that the buyer and the product are in the database and updates the corresponding record or inserts a new purchase. It also does a JOIN to list all purchases. 翻译 899天前 翻译
127#翻译 Example 33 ~~~~~~~~~~ 翻译 899天前 翻译
128#翻译 In controller: database_examples.py :: def delete_purchased(): dba(dba.purchases.id>0).delete() redirect(URL(r=request,f='buy')) 翻译 899天前 翻译
129#翻译 Example 34 ~~~~~~~~~~ 翻译 899天前 翻译
130#翻译 In controller: database_examples.py :: def reset_purchased(): dba(dba.purchases.id>0).update(quantity=0) redirect(URL(r=request,f='buy')) 翻译 899天前 翻译
131#翻译 This is an update on an SQLSet. (dba.purchase.id>0 identifies the set containing only table dba.purchases.) 翻译 899天前 翻译
132#翻译 Example 35 ~~~~~~~~~~ 翻译 899天前 翻译
133#翻译 In controller: database_examples.py :: def download(): import gluon.contenttype filename=request.args[0] response.headers['Content-Type']=\ gluon.contenttype.contenttype(filename) return open('applications/%s/uploads/%s' % (request.application,filename),'rb').read() 翻译 899天前 翻译
134#翻译 This controller allows users to download the uploaded pictures of the dogs. Remember the upload=URL(...'download'...) statement in the register_dog function. Notice that in the URL path /application/controller/function/a/b/etc a, b, etc are passed to the controller as request.args[0], request.args[1], etc. Since the URL is validated request.args[] always contain valid filenames and no '~' or '..' etc. This is usefult to allow visitors to link uploaded files. 翻译 899天前 翻译
135#翻译 Cache Examples ---------------- 翻译 899天前 翻译
136#翻译 Example 36 ~~~~~~~~~~ 翻译 899天前 翻译
137#翻译 In controller: cache_examples.py :: def cache_in_ram(): import time t=cache.ram('time',lambda:time.ctime(),time_expire=5) return dict(time=t,link=A('click to reload',_href=URL(r=request))) 翻译 899天前 翻译
138#翻译 The output of lambda:time.ctime() is cached in ram for 5 seconds. The string 'time' is used as cache key. 翻译 899天前 翻译
139#翻译 Example 37 ~~~~~~~~~~ 翻译 899天前 翻译
140#翻译 In controller: cache_examples.py :: def cache_on_disk(): import time t=cache.disk('time',lambda:time.ctime(),time_expire=5) return dict(time=t,link=A('click to reload',_href=URL(r=request))) 翻译 899天前 翻译
141#翻译 The output of lambda:time.ctime() is cached on disk (using the shelve module) for 5 seconds. 翻译 899天前 翻译
142#翻译 Example 38 ~~~~~~~~~~ 翻译 899天前 翻译
143#翻译 In controller: cache_examples.py :: def cache_in_ram_and_disk(): import time t=cache.ram('time',lambda:cache.disk('time',\ lambda:time.ctime(),time_expire=5),time_expire=5) return dict(time=t,link=A('click to reload',_href=URL(r=request))) 翻译 899天前 翻译
144#翻译 The output of lambda:time.ctime() is cached on disk (using the shelve module) and then in ram for 5 seconds. web2py looks in ram first and if not there it looks on disk. If it is not on disk it calls the function. This is useful in a multiprocess type of environment. The two times do not have to be the same. 翻译 899天前 翻译
145#翻译 Example 39 ~~~~~~~~~~ 翻译 899天前 翻译
146#翻译 In controller: cache_examples.py :: @cache(request.env.path_info,time_expire=5,cache_model=cache.ram) def cache_controller_in_ram(): import time t=time.ctime() return dict(time=t,link=A('click to reload',_href=URL(r=request))) 翻译 899天前 翻译
147#翻译 Here the entire controller (dictionary) is cached in ram for 5 seconds. The result of a select cannot be cached unless it is first serialized into a table lambda:SQLTABLE(dba().select(dba.users.ALL)).xml(). You can read below for an even better way to do it. 翻译 899天前 翻译
148#翻译 Example 40 ~~~~~~~~~~ 翻译 899天前 翻译
149#翻译 In controller: cache_examples.py :: @cache(request.env.path_info,time_expire=5,cache_model=cache.disk) def cache_controller_on_disk(): import time t=time.ctime() return dict(time=t,link=A('click to reload',_href=URL(r=request))) 翻译 899天前 翻译
150#翻译 Here the entire controller (dictionary) is cached on disk for 5 seconds. This will not work if the dictionary contains unpickleble objects. 翻译 899天前 翻译
151#翻译 Example 41 ~~~~~~~~~~ 翻译 899天前 翻译
152#翻译 In controller: cache_examples.py :: @cache(request.env.path_info,time_expire=5,cache_model=cache.ram) def cache_controller_and_view(): import time t=time.ctime() d=dict(time=t,link=A('click to reload',_href=URL(r=request))) return response.render(d) 翻译 899天前 翻译
153#翻译 response.render(d) renders the dictionary inside the controller, so everything is cached now for 5 seconds. This is best and fastest way of caching! 翻译 899天前 翻译
154#翻译 Example 42 ~~~~~~~~~~ 翻译 899天前 翻译
155#翻译 In controller: cache_examples.py :: def cache_db_select(): import time dba.users.insert(name='somebody',email='gluon@mdp.cti.depaul.edu') records=dba().select(dba.users.ALL,cache=(cache.ram,5)) if len(records)>20: dba(dba.users.id>0).delete() return dict(records=records) 翻译 899天前 翻译
156#翻译 The results of a select are complex unpickable objects that cannot be cached using the previous method, but the select command takes an argument cache=(cache_model,time_expire) and will cache the result of the query accordingly. Notice that the key is not necessary since key is generated based on the database name and the select string. 翻译 899天前 翻译
157#翻译 Ajax Examples -------------- 翻译 899天前 翻译
158#翻译 Example 43 ~~~~~~~~~~ 翻译 899天前 翻译
159#翻译 In controller: ajax_examples.py :: def index(): return dict() def data(): if not session.m or len(session.m)==10: session.m=[] if request.vars.q: session.m.append(request.vars.q) session.m.sort() return TABLE(*[TR(v) for v in session.m]).xml() 翻译 899天前 翻译
160#翻译 In view: ajax_examples/index.html .. syntax:: html :: {{extend 'layout.html'}} <p>Type something and press the button. The last 10 entries will appear sorted in a table below.</p> <form> <INPUT type="text" id='q' value="web2py"/> <INPUT type="button" value="submit" onclick="ajax('{{=URL(r=request,f='data')}}',['q'],'target');"/> </form> <br/> <div id="target"></div> .. syntax:: python 翻译 899天前 翻译
161#翻译 The javascript function "ajax" is provided in "web2py_ajax.html" and included by "layout.html". It takes three arguments, a url, a list of ids and a target it. When called it send to the url (via a get) the values of the ids and display the respose in the value (of innerHTML) of the target id. 翻译 899天前 翻译
162#翻译 Example 44 ~~~~~~~~~~ 翻译 899天前 翻译
163#翻译 In controller: ajax_examples.py :: def flash(): response.flash='this text should appear!' return dict() 翻译 899天前 翻译
164#翻译 Example 45 ~~~~~~~~~~ 翻译 899天前 翻译
165#翻译 In controller: ajax_examples.py :: def fade(): return dict() 翻译 899天前 翻译
166#翻译 In view: ajax_examples/fade.html .. syntax:: html :: {{extend 'layout.html'}} <form> <input type="button" onclick="fade('test',-0.2);" value="fade down"/> <input type="button" onclick="fade('test',+0.2);" value="fade up"/> </form> <div id="test">{{='Hello World '*100}}</div> .. syntax:: python 翻译 899天前 翻译
167#翻译 Testing Examples ---------------- 翻译 899天前 翻译
168#翻译 Example 46 ~~~~~~~~~~ 翻译 899天前 翻译
169#翻译 Using the Python doctest notation it is possible to write tests for all controller functions. Tests are then run via the administrative interface which generates a report. Here is an example of a test in the code: :: def index(): ''' This is a docstring. The following 3 lines are a doctest: >>> request.vars.name='Max' >>> index() {'name': 'Max'} ''' return dict(name=request.vars.name) 翻译 899天前 翻译
170#翻译 Large Files Example -------------------- 翻译 899天前 翻译
171#翻译 Example 47 ~~~~~~~~~~~~ 翻译 899天前 翻译
172#翻译 It is very easy in web2py to stream large files. Here is an example of a controller that does so: :: def streamer(): return response.stream(open('largefile.mpg4','rb'),chunk_size=4096) 翻译 899天前 翻译
173#翻译 XML-RPC Example ~~~~~~~~~~~~~~~~ 翻译 899天前 翻译
174#翻译 Example 48 ~~~~~~~~~~ 翻译 899天前 翻译
175#翻译 Web2py has native support for the XMLRPC protocol. Below is a controller function "handler" that exposes two functions, "add" and "sub" via XMLRPC. The controller "tester" executes the two function remotely via xmlrpc. :: def add(a,b): return a+b def sub(a,b): return a-b def handler(): return response.xmlrpc(request,[add,sub]) def tester(): import xmlrpclib server=xmlrpclib.ServerProxy('http://hostname:port/app/controller/handler') return str(server.add(3,4)+server.sub(3,4)) Web2py对XMLRPC协议提供原生支持,controller用handler函数来处理两个外部函数,即'add'和'sub'执行XMLRPC,名为"tester"的controller执行这两个函数远程执行XMLRPC :: def add(a,b): return a+b def sub(a,b): return a-b def handler(): return response.xmlrpc(request,[add,sub]) def tester(): import xmlrpclib server=xmlrpclib.ServerProxy('http://hostname:port/app/controller/handler') return str(server.add(3,4)+server.sub(3,4)) 593天前 翻译