数据库操作
Python 操作 Mysql 模块的安装
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linux： yum install MySQL-python
window： http://files.cnblogs.com/files/wupeiqi/py-mysql-win.zip
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SQL基本使用
1、数据库操作
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show databases; use [databasename];create database [name]; |
2、数据表操作
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show tables;create table students (
id int not null auto_increment primary key,
name char(8) not null,
sex char(4) not null,
age tinyint unsigned not null,
tel char(13) null default "-"
);
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CREATE TABLE `wb_blog` (
`id` smallint(8) unsigned NOT NULL,
`catid` smallint(5) unsigned NOT NULL DEFAULT ',
`title` varchar(80) NOT NULL DEFAULT '',
`content` text NOT NULL,
PRIMARY KEY (`id`),
UNIQUE KEY `catename` (`catid`)
) ;
创建表wb_blog
3、数据操作
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insert into students(name,sex,age,tel) values('alex','man',18,'151515151')
delete from students where id =2;
update students set name = 'sb' where id =1;
select * from students
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4、其他
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主键外键左右连接 |
Python MySQL API
一、插入数据
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import MySQLdb
conn = MySQLdb.connect(host='127.0.0.1',user='root',passwd='1234',db='mydb')
cur = conn.cursor()
reCount = cur.execute('insert into UserInfo(Name,Address) values(%s,%s)',('alex','usa'))
# reCount = cur.execute('insert into UserInfo(Name,Address) values(%(id)s, %(name)s)',{'id':12345,'name':'wupeiqi'}) conn.commit() cur.close()conn.close() print reCount
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import MySQLdb
conn = MySQLdb.connect(host=',db='mydb')
cur = conn.cursor()
li =[
('alex','usa'),
('sb','usa'),
]
reCount = cur.executemany('insert into UserInfo(Name,Address) values(%s,%s)',li)
conn.commit()
cur.close()
conn.close()
print reCount
MySQLdb
注意：cur.lastrowid
二、删除数据
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import MySQLdb
conn = MySQLdb.connect(host='127.0.0.1',user='root',passwd='1234',db='mydb')
cur = conn.cursor()
reCount = cur.execute('delete from UserInfo')
conn.commit()cur.close()conn.close()print reCount
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三、修改数据
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import MySQLdb
conn = MySQLdb.connect(host='127.0.0.1',user='root',passwd='1234',db='mydb')
cur = conn.cursor()
reCount = cur.execute('update UserInfo set Name = %s',('alin',))
conn.commit()cur.close()conn.close()print reCount
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四、查数据
# ############################## fetchone/fetchmany(num) ##############################
import MySQLdb
conn = MySQLdb.connect(host='127.0.0.1',user='root',passwd='1234',db='mydb')
cur = conn.cursor()
reCount = cur.execute('select * from UserInfo')
print cur.fetchone()
print cur.fetchone()
cur.scroll(-1,mode='relative')
print cur.fetchone()
print cur.fetchone()
cur.scroll(0,mode='absolute')
print cur.fetchone()
print cur.fetchone()
cur.close()
conn.close()
print reCount
# ############################## fetchall ##############################
import MySQLdb
conn = MySQLdb.connect(host='127.0.0.1',user='root',passwd='1234',db='mydb')
#cur = conn.cursor(cursorclass = MySQLdb.cursors.DictCursor)
cur = conn.cursor()
reCount = cur.execute('select Name,Address from UserInfo')
nRet = cur.fetchall()
cur.close()
conn.close()
print reCount
print nRet
for i in nRet:
print i[0],i[1]