python数据库操作
Python 操作 Mysql 模块的安装
python3.5的mysql模块为pymysql
1 2 3 4 5 | linux: yum install MySQL - python window: http: / / files.cnblogs.com / files / wupeiqi / py - mysql - win. zip |
SQL基本使用
1、数据库操作
1 2 3 | show databases; use [databasename]; create database [name]; |
2、数据表操作
1 2 3 4 5 6 7 8 9 10 | 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 "-" ); |
CREATE TABLE `wb_blog` ( `id` smallint(8) unsigned NOT NULL, `catid` smallint(5) unsigned NOT NULL DEFAULT '0', `title` varchar(80) NOT NULL DEFAULT '', `content` text NOT NULL, PRIMARY KEY (`id`), UNIQUE KEY `catename` (`catid`) ) ;
3、数据操作
1 2 3 4 5 6 7 | 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 |
4、其他
1 2 3 | 主键 外键 左右连接 |
Python MySQL API
一、插入数据
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | 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 |
import MySQLdb conn = MySQLdb.connect(host='127.0.0.1',user='root',passwd='1234',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
注意:cur.lastrowid
二、删除数据
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | 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 |
三、修改数据
1 2 3 4 5 6 7 8 9 10 11 12 13 | 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 |
四、查数据
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 | # ############################## 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 ] |