python如何连接mysql

主要使用了MySQLdb

代码部分

#!/usr/bin/python
# coding=utf-8
__author__ = 'chunlongyuan'

import MySQLdb
import urllib2
import time

host = "localhost"
user = "root"
password = "root"
db = "test_db"

pageSize = 10

try:
    conn = MySQLdb.connect(host, user, password, db)
except Exception, e:
    print "连接数据库失败"
    exit(0)

startTime = time.time()

try:
    #获取cursor
    cursor = conn.cursor()

    #分页查找数据，处理数据
    for page in range(1, 10):
        start = (page - 1) * pageSize
        sql = "select field1,field2 from tablename limit %d, %d" % (start, pageSize)
        print sql
        #执行sql
        cursor.execute(sql)

        #获取sql执行完的结果(多条数据)
        data = cursor.fetchall()

        if len(data) > 0:
            for fields in data:
                #fields[0]一行数据的第一个字段
                field1 = fields[0]
        else:
            break
    print '执行完成,耗时(s):%d' % ((time.time() - startTime) / 1000)


except Exception:
    print "处理时出现异常"
finally:
    cursor.close()
    conn.close()
    file.close()