mysql mycat 中间件安装与使用

# tar zxvf Mycat-server-1.6-RELEASE-20161028204710-linux.tar.gz -C /usr/local/

# vim /usr/local/mycat/conf/server.xml //添加以下内容

 <user name="user">  //mycat用户名
 <property name="password">user</property> //mycat密码
 <property name="schemas">mytest</property>  //mycat虚拟数据库名
 <property name="readOnly">true</property>  //只读
 </user>

 <user name="tankzhang">
 <property name="password">admin</property>
 <property name="schemas">mytest</property>
 </user>

# cat schema.xml
<?xml version="1.0"?>
<!DOCTYPE mycat:schema SYSTEM "schema.dtd">
<mycat:schema xmlns:mycat="http://io.mycat/">

<schema name="mytest" checkSQLschema="false" sqlMaxLimit="100" dataNode="my1" />//定义虚拟数据库名mytest
<dataNode name="my1" dataHost="test1" database="test" /> //真实数据库名test
<dataHost name="test1" maxCon="1000" minCon="10" balance="1" writeType="0" dbType="mysql" dbDriver="native" >
<heartbeat>select user()</heartbeat>
<writeHost host="hostM1" url="192.168.5.213:3306" user="tank" password="123456" > //真实数据库的连接方式
 <readHost host="hostS1" url="192.168.5.214:3306" user="tank" password="123456" /> //同上
 </writeHost>
 </dataHost>

</mycat:schema>

grant all privileges on test. to tank@"192.168.%" identified by '123456';
flush privileges

# ./mycat start
Starting Mycat-server...

# stat -tpnl |grep 8066
tcp 0 0 :::8066 ::: LISTEN 31728/java 

# ./mycat status
Mycat-server is running (31726).

# mysql -u tankzhang -p -P 8066 -h 127.0.0.1 //一定要带上127.0.0.1
Enter password:
Wele to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 5.6.29-mycat-1.6-RELEASE-20161028204710 MyCat Server (OpenCloundDB)

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Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> show databases;
+----------+
| DATABASE |
+----------+
| mytest |    //虚拟数据库
+----------+
1 row in set (0.00 sec)

mysql> use mytest;
Reading table information for pletion of table and column names
You can turn off this feature to get a quicker startup with -A

mysql> CREATE TABLE IF NOT EXISTS `user` (
 -> `id` int(11) unsigned NOT NULL DEFAULT '0' COMMENT 'ID',
 -> `name` varchar(20) NOT NULL DEFAULT '' COMMENT '姓名',
 -> `create_time` int(10) NOT NULL DEFAULT '0' COMMENT '创建时间',
 -> PRIMARY KEY (`id`)
 -> ) ENGINE=MyISAM DEFAULT CHARSET=utf8 AUTO_INCREMENT=1 ;
Query OK, 0 rows affected (0.08 sec)

Database changed
mysql> show tables;
+----------------+
| Tables_in_test |
+----------------+
| user |
+----------------+
1 row in set (0.01 sec)

mysql> INSERT INTO `user` (`id` ,`name`)VALUES ('1', 'tank');
Query OK, 1 row affected (0.00 sec)

mysql> select  from user;  //修改从数据库的user表中的name,会发现读是从从数据库读取的
+----+-----------+-------------+
| id | name | create_time |
+----+-----------+-------------+
| 1 | tankzhang | 0 |
+----+-----------+-------------+
1 row in set (0.01 sec)