本文实例讲述了Python3实现的Mysql数据库操作封装类。分享给大家供大家参考，具体如下：

#encoding:utf-8

#name:mod_db.py

'''''

使用方法：1.在主程序中先实例化DB Mysql数据库操作类。

2.使用方法:db=database() db.fetch_all("sql")

'''

import MySQLdb

import MySQLdb.cursors

import mod_config

import mod_logger

DB = "database"

LOGPATH = mod_config.getConfig('path', 'logpath') + 'database.log'

DBNAME = mod_config.getConfig(DB, 'dbname')

DBHOST = mod_config.getConfig(DB, 'dbhost')

DBUSER = mod_config.getConfig(DB, 'dbuser')

DBPWD = mod_config.getConfig(DB, 'dbpassword')

DBCHARSET = mod_config.getConfig(DB, 'dbcharset')

DBPORT = mod_config.getConfig(DB, "dbport")

logger = mod_logger.logger(LOGPATH)

#数据库操作类

class database:

#注，python的self等于其它语言的this

def __init__(self, dbname=None, dbhost=None):

self._logger = logger

#这里的None相当于其它语言的NULL

if dbname is None:

self._dbname = DBNAME

else:

self._dbname = dbname

if dbhost is None:

self._dbhost = DBHOST

else:

self._dbhost = dbhost

self._dbuser = DBUSER

self._dbpassword = DBPWD

self._dbcharset = DBCHARSET

self._dbport = int(DBPORT)

self._conn = self.connectMySQL()

if(self._conn):

self._cursor = self._conn.cursor()

#数据库连接

def connectMySQL(self):

conn = False

try:

conn = MySQLdb.connect(host=self._dbhost,

user=self._dbuser,

passwd=self._dbpassword,

db=self._dbname,

port=self._dbport,

cursorclass=MySQLdb.cursors.DictCursor,

charset=self._dbcharset,

)

except Exception,data:

self._logger.error("connect database failed, %s" % data)

conn = False

return conn

#获取查询结果集

def fetch_all(self, sql):

res = ''

if(self._conn):

try:

self._cursor.execute(sql)

res = self._cursor.fetchall()

except Exception, data:

res = False

self._logger.warn("query database exception, %s" % data)

return res

def update(self, sql):

flag = False

if(self._conn):

try:

self._cursor.execute(sql)

self._conn.commit()

flag = True

except Exception, data:

flag = False

self._logger.warn("update database exception, %s" % data)

return flag

#关闭数据库连接

def close(self):

if(self._conn):

try:

if(type(self._cursor)=='object'):

self._cursor.close()

if(type(self._conn)=='object'):

self._conn.close()