我的python版本( 2.7 )
需要安装python mysql驱动
sudo pip install MySQL-python
如果报错，找不到mysql_config:
sudo ln -s /usr/local/mysql57/bin/mysql_config /usr/local/bin/mysql_config
这里自己根据实际情况，建立一个软连接，驱动就能够找到mysql_config，因为我mysql装在/usr/local/mysql57下面
如果报错，找不到libmysqlclient.so.20，同样建立一个对应的软连接( 请根据自己电脑的实际情况在相应的目录建立软链接 )
sudo ln -s /usr/local/mysql57/lib/libmysqlclient.so.20 /usr/lib/libmysqlclient.so.20
python mysql操作流程：
开始->创建连接对象( connection )->获取游标对象cursor->执行select语句(cursor.execute() )->使用cursor.fetch*( fetchone,fetchall,fetchmany )获取并处理数据->关闭cursor->关闭connect
->结束
mysql> select * from user_info; +---------+-----------+ | user_id | user_name | +---------+-----------+ | 1 | ghostwu | | 2 | zhangsan | | 3 | zhangsan | | 4 | zhangsan | +---------+-----------+ 4 rows in set (0.00 sec) mysql>
1 #!/usr/bin/python 2 #coding:utf-8 3 4 import MySQLdb 5 6 conn = MySQLdb.Connect( 7 host = ‘127.0.0.1‘, 8 port = 3306, 9 user = ‘root‘, 10 passwd = ‘abc123‘, 11 db = ‘shop‘, 12 charset = ‘utf8‘ 13 ) 14 15 cursor = conn.cursor() 16 17 sql = ‘select * from user_info‘ 18 19 cursor.execute( sql ) 20 21 print cursor.rowcount 22 23 res = cursor.fetchone() 24 print res 25 26 res = cursor.fetchmany( 2 ) 27 print res 28 29 res = cursor.fetchall() 30 print res 31 32 cursor.close() 33 conn.close()
当数据量比较小的时候，可以一次性读取出来，遍历fetchall的数据
1 #!/usr/bin/python 2 #coding:utf-8 3 4 import MySQLdb 5 6 conn = MySQLdb.Connect( 7 host = ‘127.0.0.1‘, 8 port = 3306, 9 user = ‘root‘, 10 passwd = ‘abc123‘, 11 db = ‘shop‘, 12 charset = ‘utf8‘ 13 ) 14 15 cursor = conn.cursor() 16 sql = ‘select * from user_info‘ 17 cursor.execute( sql ) 18 19 res = cursor.fetchall() 20 for row in res: 21 print ‘userid=%s, username=%s‘ % row 22 23 cursor.close() 24 conn.close()
python操作mysql增删改:
#!/usr/bin/python #coding:utf-8 import MySQLdb conn = MySQLdb.Connect( host = ‘127.0.0.1‘, port = 3306, user = ‘root‘, passwd = ‘abc123‘, db = ‘shop‘, charset = ‘utf8‘ ) cursor = conn.cursor() ‘‘‘ sql_insert = "insert into user_info( user_id, user_name ) values( null, ‘hello‘ )" cursor.execute( sql_insert ) print cursor.rowcount ‘‘‘ ‘‘‘ sql_delete = "delete from user_info where user_name = ‘hello‘" cursor.execute( sql_delete ) print cursor.rowcount ‘‘‘ sql_update = "update user_info set user_name = ‘ghostwu‘ where user_id = 4" cursor.execute( sql_update ) print cursor.rowcount cursor.close() conn.close()
修改表引擎，测试事务
alter table user_info engine = innodb
#!/usr/bin/python #coding:utf-8 import MySQLdb conn = MySQLdb.Connect( host = ‘127.0.0.1‘, port = 3306, user = ‘root‘, passwd = ‘abc123‘, db = ‘shop‘, charset = ‘utf8‘ ) cursor = conn.cursor() sql_insert = "insert into user_info( user_id, user_name ) values( null, ‘悟空‘ )" cursor.execute( sql_insert ) conn.commit() print cursor.rowcount cursor.close() conn.close()
如果没有conn.commit()这条语句，执行之后，不会在mysql表中，看到新插入的记录。python mysql默认是关闭自动提交事务的
回滚测试
#!/usr/bin/python #coding:utf-8 import MySQLdb conn = MySQLdb.Connect( host = ‘127.0.0.1‘, port = 3306, user = ‘root‘, passwd = ‘abc123‘, db = ‘shop‘, charset = ‘utf8‘ ) cursor = conn.cursor() sql_insert = "insert into user_info( user_id, user_name ) values( null, ‘悟空‘ )" sql_insert1 = "insert into user_info( user_id, user_name ) values( null, ‘八戒‘ )" sql_insert2 = "insert into user_info( user_id, user_name1 ) values( null, ‘白龙马‘ )" try: cursor.execute( sql_insert ) cursor.execute( sql_insert1 ) cursor.execute( sql_insert2 ) except Exception as e: print e conn.rollback cursor.close() conn.close()
