环境中需要使用统一入口访问多数据库，环境下有B2C、B2B、O2O数据库，现针对所有B2C、B2B、O2O中的所有订单进行聚合搭建一个类似京东京享值一样的会员级别系统，针对不同级别会员给予不同的优惠。
数据库
数据库主机
数据库用户名
数据库用密码
备注
b2c
192.168.0.200
root
123456
B2C数据库
b2b
192.168.0.201
root
123456
B2B数据库
o2o
192.168.0.202
root
123456
O2O数据库
1.先安装JDK
tar zxf jdk-8u211-linux-x64.tar.gz
mv jdk1.8.0_211 /usr/local/
2.配置PATH
echo 'export PATH=/usr/local/jdk1.8.0_211/bin:$PATH'>>/etc/profile
source /etc/profile
java -version
3.下载mycat
wget http://dl.mycat.io/1.6.6.1/Mycat-server-1.6.6.1-release-1031195535-linux.tar.gz
mv mycat /usr/local/
4.配置mycat
配置server.xml
cd /usr/local/mycat
cp -rf conf conf_ori
cd conf
vim server.xml
0
1
0
0
2
false
0
0
1
64k
1k
0
384m
false
false
true
123456
b2c,b2b,o2o
user
b2c,b2b,o2o
false
vim schema.xml
select user()
select user()
select user()
可以看到关键的逻辑是这个schema.xml配置文件
5.启动mycat并查看日志
启动mycat
/usr/local/mycat/bin/mycat start
查看日志
vim /usr/local/mycat/logs/wrapper.log
显示
STATUS | wrapper | /05/26 18:28:10 | --> Wrapper Started as Daemon
STATUS | wrapper | /05/26 18:28:10 | Launching a JVM...
INFO | jvm 1 | /05/26 18:28:10 | Java HotSpot(TM) 64-Bit Server VM warning: ignoring option MaxPermSize=64M; support was removed in 8.0
INFO | jvm 1 | /05/26 18:28:11 | Wrapper (Version 3.2.3)
INFO | jvm 1 | /05/26 18:28:11 | Copyright 1999- Tanuki Software, Inc. All Rights Reserved.
INFO | jvm 1 | /05/26 18:28:11 |
INFO | jvm 1 | /05/26 18:28:12 | MyCAT Server startup successfully. see logs in logs/mycat.log
可以看到服务启动了
6.查看结果
mysql -h127.0.0.1 -P8066 -uroot -p123456
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 5.6.29-mycat-1.6.6.1-release-1031195535 MyCat Server (OpenCloudDB)
Copyright (c) 2000, , Oracle, MariaDB Corporation Ab and others.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MySQL [(none)]> show databases;
+----------+
| DATABASE |
+----------+
| b2b |
| o2o |
| b2c |
+----------+
3 rows in set (0.00 sec)
