Python基于pymysql的数据库操作类的安装运行过程

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一 简介
     Python和mysql交互的模块有 Mysqldb 和 PyMySQL(pymysql),MySQLdb是基于C 语言编写的，而且python3 不在支持MySQLdb 。PyMySQL是一个纯Python写的MySQL客户端，它的目标是替代MySQLdb，可以在CPython、PyPy、IronPython和Jython环境下运行,PyMySQL在MIT许可下发布。
    在开发基于Python语言的项目中，为了以后系统能兼容Python3,我们使用了PyMySQL替换了MySQLdb。下面我们来熟悉一下pymysql的使用。
 
二 安装方式
  pymsql的源码 https://GitHub.com/PyMySQL/PyMySQL ，目前还在持续更新。

1. 安装要求:
   

2. Python -- one of the following:
   

3.      CPython >= 2.6 or >= 3.3
   

4.      PyPy >= 4.0
   

5.      IronPython 2.7
   

6. MySQL Server -- one of the following:
   

7.      MySQL >= 4.1 (tested with only 5.5~)
   

8.      MariaDB >= 5.1

9. 安装

10.   pip install PyMySQL

 

三 基于pymysql的数据库交互

1. #!/usr/bin/env python
   

2. # encoding: utf-8
   

3. """
   

4. author: yangyi@youzan
   

5. time:   2015/6/8 上午11:34
   

6. func: 基于pymysql的数据库交互类，支持事务提交和回滚，返回结果记录行数，和insert的最新id
   

7. """
   

8. import pymysql
   

9. from warnings import filterwarnings
   

10. filterwarnings('ignore', cateGory=pymysql.Warning)
    

11. CONNECT_TIMEOUT = 100
    

12. IP = 'localhost'
    

13. PORT = 3306
    

14. USER = 'root'
    

15. PASSSWord = ''
    

16. 
    

17. class QueryException(Exception):
    

18.     """
    

19.     """
    

20. 
    

21. 
    

22. class ConnectionException(Exception):
    

23.     """
    

24.     """

25. 
    

26. class MySQL_Utils():
    

27.     def __init__(
    

28.             self, ip=IP, port=PORT, user=USER, password=PASSSWORD,
    

29.             connect_timeout=CONNECT_TIMEOUT, remote=False, Socket='', dbname='test'):
    

30.         self.__conn = None
    

31.         self.__cursor = None
    

32.         self.lastrowid = None
    

33.         self.connect_timeout = connect_timeout
    

34.         self.ip = ip
    

35.         self.port = port
    

36.         self.user = user
    

37.         self.password = password
    

38.         self.mysocket = socket
    

39.         self.remote = remote
    

40.         self.db = dbname
    

41.         self.rows_affected = 0
    

42. 
    

43. 
    

44.     def __init_conn(self):
    

45.         try:

46.             conn = pymysql.connect(
    

47.                     host=self.ip,
    

48.                     port=int(self.port),
    

49.                     user=self.user,
    

50.                     db=self.db,
    

51.                     connect_timeout=self.connect_timeout,
    

52.                     charset='utf8', unix_socket=self.mysocket)
    

53.         except pymysql.Error as e:
    

54.             raise ConnectionException(e)
    

55.         self.__conn = conn
    

56. 
    

57. 
    

58.     def __init_cursor(self):
    

59.         if self.__conn:
    

60.             self.__cursor = self.__conn.cursor(pymysql.cursors.DictCursor)
    

61. 
    

62. 
    

63.     def close(self):
    

64.         if self.__conn:
    

65.             self.__conn.close()
    

66.             self.__conn = None
    

67. 
    

68.     #专门处理select 语句

69.     def exec_sql(self, sql, args=None):
    

70.         try:
    

71.             if self.__conn is None:
    

72.                 self.__init_conn()
    

73.                 self.__init_cursor()
    

74.             self.__conn.autocommit = True
    

75.             self.__cursor.execute(sql, args)
    

76.             self.rows_affected = self.__cursor.rowcount
    

77.             results = self.__cursor.fetchall()
    

78.             return results
    

79.         except pymysql.Error as e:
    

80.             raise pymysql.Error(e)
    

81.         finally:
    

82.             if self.__conn:
    

83.                 self.close()
    

84. 
    

85.     # 专门处理dml语句 delete，updete，insert 

86.     def exec_txsql(self, sql, args=None):
    

87.         try:
    

88.             if self.__conn is None:
    

89.                 self.__init_conn()
    

90.                 self.__init_cursor()
    

91.             if self.__cursor is None:
    

92.                 self.__init_cursor()
    

93. 
    

94. 
    

95.             self.rows_affected=self.__cursor.execute(sql, args)

96.             self.lastrowid = self.__cursor.lastrowid

97.             return self.rows_affected

98.         except pymysql.Error as e:
    

99.             raise pymysql.Error(e)
    

100.         finally:
     

101.             if self.__cursor:
     

102.                 self.__cursor.close()
     

103.                 self.__cursor = None
     

104. 
     

105.     # 提交

106.     def commit(self):
     

107.         try:
     

108.             if self.__conn:
     

109.                 self.__conn.commit()
     

110.         except pymysql.Error as e:
     

111.             raise pymysql.Error(e)
     

112.         finally:
     

113.             if self.__conn:
     

114.                 self.close()
     

115. 
     

116.     #回滚操作

117.     def rollback(self):
     

118.         try:
     

119.             if self.__conn:
     

120.                 self.__conn.rollback()

121.         except pymysql.Error as e:
     

122.             raise pymysql.Error(e)
     

123.         finally:
     

124.             if self.__conn:
     

125.                 self.close()
     

126.     # 适用于需要获取插入记录的主键自增id
     

127.     def get_lastrowid(self):
     

128.         return self.lastrowid

     #获取dml操作影响的行数
    def get_affectrows(self):
        return self.rows_affected
     #MySQL_Utils初始化的实例销毁之后，自动提交
     def __del__(self):
        self.commit()

上述就是小编为大家分享的Python基于pymysql的数据库操作类的安装运行过程了，如果刚好有类似的疑惑，不妨参照上述分析进行理解。如果想知道更多相关知识，欢迎关注编程网数据库频道。