由於最近學習Python，從最基礎的Python基礎教程學起，其中最後的十個項目還是很不錯的。個人認爲。本人新手，如有錯誤，還請指教。
書上用的是PostgreSQL,這裏用的是MySQL。由於這是一個CGI項目。所以事先需要準備一個可以運行CGI腳本的試驗環境。
本次用的是Apache運行cgi。配置網上很多。
其次需要創建一個數據表：
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`) )
一個簡單的公告板，主要功能：顯示所有公告、查看單個公告、編輯公告、保存公告、刪除公告(個人增加的)。根據這些功能可以創建五個對應的腳本：main.cgi、view.cgi、edit.cgi、save.cgi、delete.cgi
一、下面廢話省略，直接上代碼和運行圖片：
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>
"""
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>
""" % subject4、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、運行截圖
