python操作MySQL数据库

MySQLdb操作的MYSQL数据库。先来一个简单的例子:

 1 import MySQLdb
 2  
 3 try:
 4     conn=MySQLdb.connect(host='localhost',user='root',passwd='root',db='test',port=3306)
 5     cur=conn.cursor()
 6     cur.execute('select * from user')
 7     cur.close()
 8     conn.close()
 9 except MySQLdb.Error,e:
10      print "Mysql Error %d: %s" % (e.args[0], e.args[1])

插入数据，批量插入数据，更新数据!

 1 import MySQLdb
 2  
 3 try:
 4     conn=MySQLdb.connect(host='localhost',user='root',passwd='root',port=3306)
 5     cur=conn.cursor()
 6      
 7     cur.execute('create database if not exists python')
 8     conn.select_db('python')
 9     cur.execute('create table test(id int,info varchar(20))')
10      
11     value=[1,'hi rollen']
12     cur.execute('insert into test values(%s,%s)',value)
13      
14     values=[]
15     for i in range(20):
16         values.append((i,'hi rollen'+str(i)))
17          
18     cur.executemany('insert into test values(%s,%s)',values)
19  
20     cur.execute('update test set info="I am rollen" where id=3')
21  
22     conn.commit()
23     cur.close()
24     conn.close()
25  
26 except MySQLdb.Error,e:
27      print "Mysql Error %d: %s" % (e.args[0], e.args[1])

请注意一定要有conn.commit()这句来提交事务，要不然不能真正的插入数据。

 1 import MySQLdb
 2  
 3 try:
 4     conn=MySQLdb.connect(host='localhost',user='root',passwd='root',port=3306,charset='utf8')
 5     cur=conn.cursor()
 6      
 7     conn.select_db('python')
 8  
 9     count=cur.execute('select * from test')
10     print 'there has %s rows record' % count
11  
12     result=cur.fetchone()
13     print result
14     print 'ID: %s info %s' % result
15  
16     results=cur.fetchmany(5)
17     for r in results:
18         print r
19  
20     print '=='*10
21     cur.scroll(0,mode='absolute')
22  
23     results=cur.fetchall()
24     for r in results:
25         print r[1]
26      
27  
28     conn.commit()
29     cur.close()
30     conn.close()
31  
32 except MySQLdb.Error,e:
33      print "Mysql Error %d: %s" % (e.args[0], e.args[1])