由于最近学习Python，从最基础的Python基础教程学起，其中最后的十个项目还是很不错的。个人认为。本人新手，如有错误，还请指教。
书上用的是PostgreSQL,这里用的是MySQL。由于这是一个CGI项目。所以事先需要准备一个可以运行CGI脚本的试验环境。
本次用的是Apache运行cgi。配置网上很多。
其次需要创建一个数据表：
CREATE TABLE `messages` ( `id` int(11) NOT NULL AUTO_INCREMENT, `subject` varchar(100) NOT NULL, `sender` varchar(15) NOT NULL, `reply_to` int(11) DEFAULT NULL, `text` mediumtext NOT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=14 DEFAULT CHARSET=utf8
一个简单的公告板，主要功能：显示所有公告、查看单个公告、编辑公告、保存公告、删除公告(个人增加的)。根据这些功能可以创建五个对应的脚本：main.cgi、view.cgi、edit.cgi、save.cgi、delete.cgi
一、下面废话省略，直接上代码和运行图片：
1、main.cgi
#!/usr/bin/python
print ‘Content-type: text/html\n‘
import cgitb; cgitb.enable()
import MySQLdb
conn=MySQLdb.connect(host=‘localhost‘,user=‘root‘, db=‘blog‘)
curs=conn.cursor()
print """
<html>
<head>
<title>The Blog Bulletin</title>
</head>
<body>
<h1>The Blog Bulletin</h1>
<table width="324" height="30" border="0" cellspacing="0">
"""
curs.execute(‘select * from messages‘)
rows=curs.fetchall()
toplevel=[]
children={}
for row in rows:
parent_id=row[3]
if parent_id is None:
toplevel.append(row)
else:
children.setdefault(parent_id,[]).append(row)
def format(row):
print ‘<p><a href="view.cgi?id=%i">%s</a> | <a href="delete.cgi?id=%i">Delete</a></p>‘ % (row[0],row[1],row[0])
try: kids=children[row[0]]
except KeyError: pass
else:
print ‘<blockquote>‘
for kid in kids:
format(kid)
print ‘</blockquote>‘
print ‘<p>‘
for row in toplevel:
format(row)
print """
</p>
<hr />
<p><a href="edit.cgi">Post Message</a></p>
</body>
</html>
"""2、view.cgi
#!/usr/bin/python print ‘Content-type: text/html\n‘ import cgitb; cgitb.enable() import MySQLdb conn=MySQLdb.connect(host=‘localhost‘,user=‘root‘,db=‘blog‘) curs=conn.cursor() import cgi,sys form=cgi.FieldStorage() id=form.getvalue(‘id‘) print """ <html> <head> <title>View Message</title> </head> <body> <h1>View Mesage</h1> """ try: id = int(id) except: print ‘Invalid message ID‘ sys.exit() curs.execute(‘select * from messages where id=%i‘ % id) rows=curs.fetchall() if not rows: print ‘Unknown message ID‘ sys.exit() row=rows[0] print """ <p><b>Subject:</b> %s<br /> <b>Sender:</b> %s<br /> <pre>%s</pre> </p> <hr /> <a href=‘main.cgi‘>Back Home</a> | <a href=‘edit.cgi?reply_to=%s‘>Reply</a> </body> </html> """ % (row[1],row[2],row[4],row[0])
3、edit.cgi
#!/usr/bin/python print ‘Content-type: text/html\n‘ import cgitb; cgitb.enable() import MySQLdb conn=MySQLdb.connect(host=‘localhost‘, user=‘root‘, db=‘blog‘) curs=conn.cursor() import cgi, sys form=cgi.FieldStorage() reply_to=form.getvalue(‘reply_to‘) print """ <html> <head> <title>Compose Message</title> </head> <body> <h1>Compose Message</h1> <form action=‘save.cgi‘ method=‘POST‘> """ subject=‘‘ if reply_to is not None: print ‘<input type="hidden" name="reply_to" value="%s"/>‘ % reply_to curs.execute(‘select subject from messages where id=%s‘ % reply_to) subject=curs.fetchone()[0] if not subject.startswith(‘Re: ‘): subject=‘Re: ‘+ subject print """ <b>Subject:</b><br /> <input type=‘text‘ size=‘40‘ name=‘subject‘ value=‘%s‘ /><br /> <b>Sender:</b><br /> <input type=‘text‘ size=‘40‘ name=‘sender‘ /><br /> <b>Message:</b><br /> <textarea name=‘text‘ cols=‘40‘ rows=‘20‘></textarea><br /> <input type=‘submit‘ value=‘Save‘/> </form> <hr /> <a href=‘main.cgi‘>Back Home</a> </body> </html> """ % subject
4、save.cgi
#!/usr/bin/python
print ‘Content-type: text/html\n‘
import cgitb; cgitb.enable()
def quote(string):
if string:
return string.replace("‘", "\\‘")
else:
return string
import MySQLdb
conn=MySQLdb.connect(host=‘localhost‘, user=‘root‘, db=‘blog‘)
curs=conn.cursor()
import cgi, sys
form=cgi.FieldStorage()
sender=quote(form.getvalue(‘sender‘))
subject=quote(form.getvalue(‘subject‘))
text=quote(form.getvalue(‘text‘))
reply_to=form.getvalue(‘reply_to‘)
if not (sender and subject and text):
print ‘Plz supply sender, subject, and text‘
sys.exit()
if reply_to is not None:
query = """
insert into messages(reply_to, sender, subject, text)
value(%i, ‘%s‘, ‘%s‘, ‘%s‘)""" % (int(reply_to), sender, subject, text)
else:
query = """
insert into messages(sender, subject, text)
value(‘%s‘, ‘%s‘, ‘%s‘)""" % (sender, subject, text)
curs.execute(query)
conn.commit()
print """
<html>
<head>
<title>Message Saved</title>
</head>
<body>
<h1>Message Saved</h1>
<hr />
<a href=‘main.cgi‘>Back Home</a>
</body>
</html>s
"""5、delete.cgi
#!/usr/bin/python print ‘Content-type: text/html\n‘ import cgitb; cgitb.enable() import MySQLdb conn=MySQLdb.connect(host=‘localhost‘, user=‘root‘, db=‘blog‘) curs=conn.cursor() import cgi, sys form=cgi.FieldStorage() id=form.getvalue(‘id‘) print """ <html> <head> <title>Delete Page</title> </head> <body> <h1>Delete Page!</h1> """ try: id = int(id) except: print "Invalid message ID." sys.exit() print """ <p>Delete subject object successful.<p> """ curs.execute(‘delete from messages where id=%i‘ % id) conn.commit() print """ </p> <hr /> <p><a href="main.cgi">Back Home</a></p> </body> </html> """
二、运行截图
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原文地址：http://chenpipi.blog.51cto.com/8563610/1588007
