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Webpy using Notes

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Author: User
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Webpy Getting Started

The work environment needs to produce and test the server frequently, the room has been very chaotic, so the development of a simple and convenient server management system (said a good tall, in fact, is a small Web application can obtain server information). The reason for choosing Webpy, formally because it is simple enough, especially for me this new python. It is a lightweight Python web development framework that works well for personal development applications.

Webpy Install 
下载：wget http://webpy.org/static/web.py-0.37.tar.gz
安装：python setup.py install
Webpy ' Hello World '

Refer to Webpy's official documentation: Http://webpy.org/docs/0.3/tutorial

Hello, world as follows:

ImportWeburls= (    '/','Index')classIndex:defGET (self):return "Hello, world!."if __name__=="__main__": App=web.application (URLs, Globals ()) App.run ()

In webpy, the URL request is mapped in the URLs tuple, such as in Get ip:port/, which calls the Get method of the index class directly, returning the string ' Hello, world! ' ；

Class index contains a get method that handles the GET request for the URL corresponding to index;

In the main function, just create a Application object, run to open a simple Web application, the default address is: 127.0.0.1:8080

GET && POST

The web consists of two methods: Get and post

For GET, you can use:

class Index:     def GET (self):         return " Hello, world!. "

And, for post, use:

class Index:     def POST (self):         = Web.input (name=None)        return"" "! "
HTML templates

In webpy, templates are generally used to store HTML page files. The approximate method of access is as follows:

URLs = (    '/img'image'= Web.template.render ('templates')class  Image:     def  GET (self):        return render.image ()

URL mappings are defined in URLs, and access to ip:port/img is handled directly by using the class image;

Web.template.render (path) is used to specify the directory for HTML, which specifies that the specified location of the HTML is located under the templates file under the current folder;

The returned Render.image () indicates that the image.html file is looked for in the directory specified by render and is returned as a result.

class Show:     def GET (self):         return render.show (' Hello world! ')
$def with (str) < HTML >    < Body >          $for i in range (5):            <H1>$str</H1  >    <body></ HTML  >

The show class is used to show the string ' Hello world! ', the following HTML for the Show.html,webpy Support Template, which supports parameters to start with the $def with () as a function;

You can use Python statements in HTML, but you need to add $ before the statement, and STR will print 5 times on the page in the HTML above.

static files

In Webpy, provides a way to access the default static files

    • Webpy as a server, the static directory is established under the current directory, and Webpy will automatically look for the files in that directory.
    • In Apache, you can use the ALIAS directive to map requests to the specified directory before processing web.py.
Webpy DB

In the WEBPY provides a database access API, in fact, from the source can be seen in the MYSQLDB package, but for the sake of convenience is still possible.

db = Web.database (dbn='MySQL', db='Test', user='Root', pw='123123')defNew_post (title, content): Db.insert ('News', Title=title, Content=content, posted_on=Datetime.datetime.utcnow ())defget_post (ID):Try:        returnDb.select ('News', where='id= $id', vars=locals ()) [0]exceptIndexerror:returnNonedefget_posts ():returnDb.select ('News', order ='ID DESC')defdel_post (ID): Db.delete ('News', where ='id = $id', VARs =locals ())defupdate_post (ID, title, content): Db.update ('News', where='id = $id', Vars=locals (), Title=title, content=content)

Webpy also supports transactions:

ImportWebDB= Web.database (dbn="Postgres", db="webpy", user="Foo", pw="") T=db.transaction ()Try: Db.insert (' Person', name='Foo') Db.insert (' Person', name='Bar')except: T.rollback ()RaiseElse: T.commit ()

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Reprinted from: Cococo Point http://www.cnblogs.com/coder2012

Webpy using Notes

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