Python MySQL数据库操作实例

发布时间:2019-08-13编辑:脚本学堂
本文介绍下python中操作mysql数据库的方法,分享一些python mysql数据库操作的例子,感兴趣的朋友做个参考。

1. 要想使python操作mysql/ target=_blank class=infotextkey>mysql数据库,首先需要安装MySQL-python包,在centos上可以使用命令来安装
 

复制代码 代码示例:
$ sudo yum install MySQL-python

2. 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
 

复制代码 代码示例:
import MySQLdb
conn = 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. 一个数据库建表和插入操作
 

复制代码 代码示例:

import MySQLdb
conn = 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. mysql数据库查询,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。

例子:
 

复制代码 代码示例:

import MySQLdb

conn = 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.rowcount
cursor.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.rowcount

cursor.close ()
conn.close ()