python非交互连接mysql
>>>import pymysql
>>>conn=pymysql.connect(host="192.168.118.57",port=3306,database="test",user="root",password="root")
>>> cursor=conn.cursor()
>>> cursor.execute("create user 'slave0'@'%' identified by 'slave0'")
0
>>> cursor.execute("grant replication slave on *.* to 'slave0'@'%'")
0
>>> cursor.execute("flush privileges")
0
>>> cursor.execute("flush tables with read lock")
0
>>> cursor.execute("unlock tables")
0
>>> cursor.execute("flush tables with read lock")
0
>>> cursor.execute("show master status")
1
>>> print(cursor.fetchall())
(('binlog.000001', 1024, '', '', ''),)
>>>
可以将上述的python连接mysql编写成脚本：
vim test.py
import pymysql
conn=pymysql.connect(host="192.168.118.57",port=3306,database="test",user="root",password="root");
cursor=conn.cursor()
cursor.execute("create user 'slave2'@'%' identified by 'slave2'")
cursor.execute("grant replication slave on *.* to 'slave2'@'%'")
cursor.execute("flush privileges")
cursor.execute("flush tables with read lock")
cursor.execute("show master status")
print(cursor.fetchall())
isOk=input("slave server ok? y/n")
if isOK=='y':
cursor.execute("unlock tables")
mycat读写分离实现
mycat:独属于mysql主从的负载均衡策略，配置写主读从
mycat是用java开发的
步骤：
1.添加一个新主机（192.168.118.70），关闭防火墙，selinux,NetworkManager
2.上传jdk和mycat安装包
3.解压并添加到指定的位置
224 tar -xf jdk-8u192-linux-x64.tar.gz
225 tar -xf Mycat-server-1.6.5-release-20180122220033-linux.tar.gz
226 cp -r jdk1.8.0_192/ /usr/local/jdk
227 cp -r mycat/ /usr/local/
4.查看并且配置jdk环境
229 ls /usr/local/jdk
230 sed -i '$aexport JAVA_HOME=/usr/local/jdk' /etc/profile
233 source /etc/profile
234 $JAVA_HOME
235 sed -i 'aexport PATH=PATH:$JAVA_HOME/bin' /etc/profile
236 source /etc/profile
237 $PATH
239 javac -version
[root@allow ~]# javac -version
javac 1.8.0_192
5.测试启动mycat
240 ls /usr/local/mycat/
241 ls /usr/local/mycat/bin
242 /usr/local/mycat/bin/mycat console
6.找到server.xml 和 schema.xml
ls /usr/local/mycat/conf
7.配置server.xml
vim /usr/local/mycat/conf/schema.xml
注释掉107-113行
8.配置schema.xml
vim /usr/local/mycat/conf/schema.xm
代码解释：
9.启动服务
/ usr / local / mycat / bin / mycat start
10.检查启动是否成功
netstat -lnput | grep 8066
tcp6 0 0 :::8066 :::* LISTEN 3242/java
11.测试连接
[root@master-mysql ~]# mysql -h192.168.118.70 -P8066 -uwangjia -pwangjia
mysql> select * from user;
+----+----------+----------+
| id | username | password |
+----+----------+----------+
| 1 | aaa | aaa |
| 2 | bbb | bbb |
+----+----------+----------+
2 rows in set (0.05 sec)
mysql> show variables like 'server_id';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| server_id | 15 |
+---------------+-------+
1 row in set (0.01 sec)