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查询（两种方法）：
import MySQLdb
conn = MySQLdb.connect (host = "localhost", user = "root", passwd = "root", db = "fish")
cursor = conn.cursor ()
cursor.execute ("SELECT * FROM polls_poll")
rows = cursor.fetchall() #获取所有结果集
for row in rows: #从结果集中一条一条读出来
print "%d, %s, %s" % (row[0], row[1], row[2])
print "Number of rows returned: %d" % cursor.rowcount
cursor.execute ("SELECT * FROM polls_poll")
while (True):
row = cursor.fetchone() #从结果集的开始，获取一条记录, 移动一下游标，直到结束返回None
if row == None:
break
print "%d, %s, %s" % (row[0], row[1], row[2])
print "Number of rows returned: %d" % cursor.rowcount
cursor.close ()
conn.close ()
插入：
cursor.execute ("INSERT INTO two(name, age) VALUES ('bill', 18)") #返回受影响的行数，执行错误返回异常
更新：
cursor.execute ("UPDATE two SET name = 'jack', age = '22' WHERE name = 'bill'") #返回受影响的行数，执行错误返回异常