通過Mycat分庫分表

前言

實驗環境：
系統：centos7
Mysql版本： 5.7
Mycat版本： 1.6
Mycat主機ip地址： 10.8.161.75
主機1地址： 10.8.161.185
主機2地址： 10.8.161.186

實驗目標：

1. 主1、主2實作分庫分表
2. 主1創建database1、創建table1；主2創建database2 、創建table1、table2
3. 通過mycat實作分庫分表

備注：本文略過主1和主2互為主從的搭建步驟，需要看請移步
<互為主從搭建步驟 />

一. 創建所需的庫和表

CREATE DATABASE databse1CHARACTER SET utf8 COLLATE utf8_general_ci;  #創建database1庫

use database1；      #進入 database1庫  

CREATE TABLE table1 (              # 創建 table1表
id INT NOT NULL AUTO_INCREMENT,
city varchar(50) NOT NULL,
PRIMARY KEY (id)
 )AUTO_INCREMENT= 1 ENGINE=InnoDB DEFAULT CHARSET=utf8;

insert into database1.table1 values(1,"beijing"); # 在table1插入資料


CREATE DATABASE databse2 CHARACTER SET utf8 COLLATE utf8_general_ci;
use databse2；                             # 創建 databse2 庫

use  databse2                             # 進入  databse2 庫
create table if not exists table2 (id int(10) PRIMARY KEY AUTO_INCREMENT,name varchar(50) NOT NULL);   # 創建 table2 表


CREATE TABLE table1 (                       # 同樣創建 table1表
id INT NOT NULL AUTO_INCREMENT,
city varchar(50) NOT NULL,
PRIMARY KEY (id)
 )AUTO_INCREMENT= 1 ENGINE=InnoDB DEFAULT CHARSET=utf8;

insert into databse2.table1 values(1,"shanghai");   #插入 table1表資料

二. 設定Mycat組態檔

這里設定組態檔之前記得先備份

1. 設定 server.xml

 <user name="mycat">
<property name="password">aA12345678.</property>
 <property name="schemas">mycat</property>  

2. 設定 rule.xml

直接清空，匯入

<?xml version="1.0" encoding="UTF-8"?>
<!-- - - Licensed under the Apache License, Version 2.0 (the "License");
    - you may not use this file except in compliance with the License. - You
    may obtain a copy of the License at - - http://www.apache.org/licenses/LICENSE-2.0
    - - Unless required by applicable law or agreed to in writing, software -
    distributed under the License is distributed on an "AS IS" BASIS, - WITHOUT
    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - See the
    License for the specific language governing permissions and - limitations
    under the License. -->
<!DOCTYPE mycat:rule SYSTEM "rule.dtd">
<mycat:rule xmlns:mycat="http://io.mycat/">
  
<tableRule name="mycat-rule">                <!-- 表分片的規則名，這里定義為mycat-rule，這個需要在schema.xml檔案中參考 -->
<rule>
<columns>id</columns>                  <!--biao1表的分片列 -->
<algorithm>mod-long</algorithm>
</rule>
</tableRule>
  
<function name="mod-long" class="io.mycat.route.function.PartitionByMod">
<!-- how many data nodes -->
<property name="count">2</property>        <!-- count值與分片個數相同，這里table1表分片到庫database1和database2庫里，共2份， -->
</function>
</mycat:rule>

3. 設定 schema.xml

要將rule.xml里定義的分片模型寫進去，由于這里的table1表配置了主鍵，所以primaryKey="id"這個也寫進去，其他情況看表結構，也可以不寫）：

<?xml version="1.0"?>
<!DOCTYPE mycat:schema SYSTEM "schema.dtd">
<mycat:schema xmlns:mycat="http://io.mycat/">
  
<schema name="mycat" checkSQLschema="false" sqlMaxLimit="100">
<table name="biao2" primaryKey="id"  dataNode="dn1" />
<table name="table1" primaryKey="id" dataNode="dn1,dn2" rule="mycat-rule" />
</schema>
          
<dataNode name="dn1" dataHost="Mycat-node" database="databse2" />
<dataNode name="dn2" dataHost="Mycat-node" database="ku1" />
  
<dataHost name="Mycat-node" maxCon="1000" minCon="10" balance="1" writeType="0" dbType="mysql" dbDriver="native" switchType="1"  slaveThreshold="100">
<heartbeat>show slave status</heartbeat>
<writeHost host="Mysql-node1" url="10.8.161.185:3306" user="root" password="aA12345678.">
<readHost host="Mysql-node2" url="10.8.161.186:3306" user="root" password="aA12345678.">
</readHost>
</writeHost>
<writeHost host="Mysql-node1" url="10.8.161.185:3306" user="root" password="aA12345678.">
</writeHost>
</dataHost>
  
</mycat:schema>

4.啟動myact，登陸查看

mysql -umycat -h 10.8.161.75 -p'aA707767695.' -P 8066  #用server.xml  里設定的賬號密碼登陸

mysql> show databases;
+----------+
| DATABASE |
+----------+
| mycat    |
+----------+
1 row in set (0.00 sec)


mysql> use mycat;
Database changed
mysql> show tables;
+-----------------+
| Tables in mycat |
+-----------------+
| table1           |
| table2           |
+-----------------+
2 rows in set (0.00 sec)


mysql> desc table1;
+-------+-------------+------+-----+---------+----------------+
| Field | Type        | Null | Key | Default | Extra          |
+-------+-------------+------+-----+---------+----------------+
| id    | int(11)     | NO   | PRI | NULL    | auto_increment |
| city  | varchar(50) | NO   |     | NULL    |                |
+-------+-------------+------+-----+---------+----------------+
2 rows in set (0.03 sec)

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