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HomeDatabaseMysql TutorialPython下使用MySQLdb模块

Python下使用MySQLdb模块,一般情况下,MySQLdb模块会自动提交修改。为确保起见,最好手动运行一次,尤其是使用update时conn.com

1、导入模块

import MySQLdb

>>> help ('MySQLdb')
>>> help ('MySQLdb.cursors')
2、连接数据库

conn =   MySQLdb.Connection(host='host',user= 'user',passwd= 'password',db = 'dbname',port=port)

例如:

conn = connect(host='10.0.*.*',user='root',db='mysql',port=3306,,passwd='test')

含义是:

host:需要连接Mysql的主机ip
user:连接mysql使用的用户名
password:连接使用的用户名密码
dbname:默认打开的数据库


连接成功后,如需切换该用户的其他数据库,使用以下语句:

conn.select_db('database name')

 

3、获取数据库操作游标(指针)
因该模块底层其实是调用C API的,所以,需要先得到当前指向数据库的指针

cur =   conn.cursor()

 

4、对数据库的相关操作
先使用指针对象执行SQL查询语句:

cur.execute('select * from tables')


其返回值为SQL语句得到的行数,如:2L,表示2行。
然后,可以从该对象的fetchone或fetchall方法得到行信息。
指针对象的fetchone()方法,是每次得到一行的tuple返回值:

  • >>> result=cur.fetchone()  
  • 指针对象的fetchall()方法,是得到一组tuple,其内容为由行信息组成的tuple值:

  • >>> result=cur.fetchall()  
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