Python实战之MySQL数据库操作

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1. 要想使Python可以操作MySQL数据库，首先需要安装MySQL-python包，在CentOS上可以使用一下命令来安装

  $ sudo yum install MySQL-python

2. 啥都不说了，走两步吧，下面的程序创建了一个到mysql数据库的连接，然后执行了一个简单的查询，并打印查询结果

import MySQLdbconn = MySQLdb.connect (host = "172.17.23.121", user = "fkong", passwd = "fkong", db = "fkong")cursor = conn.cursor ()cursor.execute ("SELECT VERSION()")row = cursor.fetchone ()print "MySQL server version:", row[0]cursor.close ()conn.close ()

3. 下面看一个数据库建表和插入操作

import MySQLdbconn = MySQLdb.connect (host = "172.17.23.121", user = "fkong", passwd = "fkong", db = "fkong")cursor = conn.cursor ()cursor.execute (""" CREATE TABLE TEST (  ID INT,  COL1 VARCHAR(40),  COL2 VARCHAR(40),  COL3 VARCHAR(40) ) """)cursor.execute (""" INSERT INTO TEST (ID, COL1, COL2, COL3) VALUES  (1, 'a', 'b', 'c'),  (2, 'aa', 'bb', 'cc'),  (3, 'aaa', 'bbb', 'ccc') """)conn.commit()cursor.close ()conn.close ()

4. 下面再来看看查询，查询通常有两种方式：一种是使用cursor.fetchall（）获取所有查询结果，然后再一行一行的迭代；另一种每次通过cursor.fetchone()获取一条记录，直到获取的结果为空为止。看一下下面的例子：

import MySQLdbconn = MySQLdb.connect (host = "172.17.23.121", user = "fkong", passwd = "fkong", db = "fkong")cursor = conn.cursor ()cursor.execute ("SELECT * FROM TEST")rows = cursor.fetchall()for row in rows: print "%d, %s, %s, %s" % (row[0], row[1], row[2], row[3])print "Number of rows returned: %d" % cursor.rowcountcursor.execute ("SELECT * FROM TEST")while (True): row = cursor.fetchone() if row == None:  break print "%d, %s, %s, %s" % (row[0], row[1], row[2], row[3]) print "Number of rows returned: %d" % cursor.rowcountcursor.close ()conn.close ()

           

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