Python学习之MySQLdb模块
CentOS下安装
sudo yum install MySQL-python
可以参考http://www.mikusa.com/python-mysql-docs/index.html 获取更多信息
MySQL-python 为Python提供MySQL驱动程序,主要包括两个部件,_mysql和MySQLdb
连接数据库
In [56]: import MySQLdb In [57]: db=MySQLdb.connect(host=‘127.0.0.1‘,user=‘xxx‘,passwd=‘xxx‘,db=‘xxx‘)
2.创建游标
为了能够在多处使用同一个连接,可以创建一个游标对象
In [60]: cur=db.cursor()
3.执行MySQL查询操作
创建数据库表
In [62]: cur.execute("CREATE TABLE song (id INT UNSIGNED PRIMARY KEY AUTO_INCREMENT,title TEXT NOT NULL)")
In [67]: songs=(‘Purple Haze‘,‘All Along the Watch Tower‘,‘Foxy Lady‘) In [68]: for song in songs: ....: cur.execute("INSERT INTO song(title) VALUES (%s)",song) ....: print "Auto Increment ID: %s" %cur.lastrowid ....:
In [5]: cur.execute("SELECT * FROM song WHERE id = %s or id = %s",(1,2))
In [7]: numrows=cur.execute("SELECT * FROM song")
4.获取查询结果
当执行了任何查询操作后,可以用fetchall()或者fetchone()获取
#/usr/bin/python import MySQLdb db=MySQLdb.connect(host=‘127.0.0.1‘,user=‘xxx‘,passwd=‘xxx‘,db=‘xxx‘) cur=db.cursor() cur.execute("SELECT * FROM account") rows=cur.fetchall() for row in rows: for col in row: print "%s," %col print "\n"
In [70]: cur.execute("SELECT * FROM song WHERE id=1") In [71]: print "ID: %s -- Title: %s" %cur.fetchone()
5.异常处理
import MySQLdb db=MySQLdb.connect(host=‘127.0.0.1‘,user=‘jialebi‘,passwd=‘jialebi123‘,db=‘dream_android_game_center‘) cur=db.cursor() try: cur.execute("SELECT * FROM account") rows=cur.fetchall() except MySQLdb.Error,e: try: print "MySQL Error [%d] : %s" % (e.args[0],e.args[1]) except IndexError: print "MySQL Error: %s" % str(e) for row in rows: for col in row: print "%s," %col print "\n"
6.清理连接
n [74]: cur.close() In [75]: db.close()
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