web.py实例之简易博客

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这个例子是从网上抄来的，原文中数据库应该是用的mysql，我只是学习，就改成了sqlite。废话不说了，直接上代码吧。

创建目录

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mkdir -p blog/templates
cd blog

后面的工作都是在blog目录下进行的，后面所有的文件也都在该目录下。

建表

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create table article(
	id integer primary key autoincrement,
	title varchar(200),
	content text,
	pub_time timestamp default(datetime('now','localtime'))
);

model.py

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import web
import datetime
db = web.database(dbn='sqlite', db='test.db')
def get_posts():
    return db.select('entries', order='id desc')
def get_post(id):
    return db.select('entries', where='id=$id', vars=locals())[0]
def new_post(title, text):
    db.insert('entries', title=title, content=text,
            pub_time=datetime.datetime.now())
def del_post(id):
    db.delete('entries', where='id=$id', vars=locals())
def update_post(id, title, text):
    db.update('entries', where='id=$id', vars=locals(),
            title=title, content=text)

blog.py

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import web
import model
urls = (
        '/', 'Index',
        '/view/(\d+)', 'View',
        '/new', 'New',
        '/delete/(\d+)', 'Delete',
        '/edit/(\d+)', 'Edit',
        '/login', 'Login',
        '/logout', 'Logout',
        )
app = web.application(urls, globals())
t_globals = {
        'datestr': web.datestr,
        'cookie': web.cookies,
        }
render = web.template.render('templates', base='base', globals=t_globals)
login = web.form.Form(
        web.form.Textbox('username'),
        web.form.Password('password'),
        web.form.Button('login')
        )
class Index:
    def GET(self):
        login_form = login()
        posts = model.get_posts()
        return render.index(posts, login_form)
    def POST(self):
        login_form = login()
        if login_form.validates():
            if login_form.d.username == 'admin' \
                    and login_form.d.password == 'admin':
                web.setcookie('username', login_form.d.username)
        raise web.seeother('/')
class View:
    def GET(self, id):
        post = model.get_post(int(id))
        return render.view(post)
class New:
    form = web.form.Form(
            web.form.Textbox('title',
                web.form.notnull,
                size=30,
                description='post title: '),
            web.form.Textarea('content',
                web.form.notnull,
                rows=30,cols=80,
                description='post content: '),
            web.form.Button('post entry')
            )
    def GET(self):
        form = self.form()
        return render.new(form)
    def POST(self):
        form = self.form()
        if not form.validates():
            return render.new(form)
        model.new_post(form.d.title, form.d.content)
        raise web.seeother('/')
class Delete:
    def GET(self, id):
        model.del_post(int(id))
        raise web.seeother('/')
    def POST(self, id):
        model.del_post(int(id))
        raise web.seeother('/')
class Edit:
    def GET(self, id):
        post = model.get_post(int(id))
        form = New.form()
        form.fill(post)
        return render.edit(post, form)
    def POST(self, id):
        form = New.form()
        post = model.get_post(int(id))
        if not form.validates():
            return render.edit(post, form)
        model.update_post(int(id), form.d.title, form.d.content)
        raise web.seeother('/')
class Logout:
    def GET(self):
        web.setcookie('username', '', expires=-1)
        raise web.seeother('/')
def notfound():
    return web.notfound('sorry, the page you were looking for was not found.')
app.notfound = notfound
if __name__ == '__main__':
    app.run()

templates/base.html

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$def with (page)
<html>
	<head>
		<title>My Blog</title>
<style>
#menu {
	width: 200px;
	float: right;
}
</style>
	</head>
	<body>
		<ul id="menu">
			<li><a href="/">Home</a></li>
			$if cookie().get('username'):
				<li><a href="/new">New Post</a></li>
		</ul>
		$:page
	</body>
</html>

templates/edit.html

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$def with (post, form)
<h1>Edit $form.d.title</h1>
<form action="" method="post">
	$:form.render()
</form>
<h2>Delete post</h2>
<form action="/delete/$post.id" method="post">
	<input type="submit" value="Delete post" />
</form>

templates/index.html

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$def with (posts, login_form)
<h1>Blog posts</h1>
$if not cookie().get('username'):
	<form action="" method="post">
	$:login_form.render()
	</form>
$else:
	Welcome $cookie().get('username')!<a href="/logout">Logout</a>
<ul>
	$for post in posts:
	<li>
		<a href="/view/$post.id">$post.title</a>
		on $post.pub_time
		$if cookie().get('username'):
			<a href="/edit/$post.id">Edit</a>
			<a href="/delete/$post.id">Del</a>
	</li>
</ul>

templates/new.html

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$def with (form)
<h1>New Blog Post</h1>
<form action="" method="post">
$:form.render()
</form>

templates/view.html

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$def with (post)
<h1>$post.title</h1>
$post.pub_time<br>
$post.content

以上例子是经过验证了的，如果不行自己找原因。