Mycat（Windows环境）（1）初入门

Mycat 是SQL集群中间件，基于阿里开源的Cobar产品而研发，继承了Cobar的稳定性、可靠性、优秀的架构和性能

<h3>1. MyCat准备 <h3>

安装 mysql

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安装jdk 1.8

这是 jdk 下载地址.

安装完成，配好环境变量

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下载maycat

这是 mycat 下载地址.
mycat 下载目录

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<h3>2. 数据库准备 <h3>

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create database db1; 

 CREATE TABLE users (  
    id INT NOT NULL AUTO_INCREMENT,  
    username varchar(32) NOT NULL default '',  
        passwork varchar(32) NOT NULL default '',
    time DATETIME NOT NULL default '1971-01-01 01:00:00',  
    PRIMARY KEY (id)  
)AUTO_INCREMENT= 1 ENGINE=InnoDB DEFAULT CHARSET=utf8;  

create database db2;  
 CREATE TABLE orders (  
    id INT NOT NULL AUTO_INCREMENT,  
    oid varchar(32) NOT NULL default '', 
        money decimal(19,4) NOT NULL default 0,
        state TINYINT NOT NULL default 0,
    time DATETIME NOT NULL default '1971-01-01 01:00:00',  
    PRIMARY KEY (id)  
)AUTO_INCREMENT= 1 ENGINE=InnoDB DEFAULT CHARSET=utf8; 

create database db3; 
CREATE TABLE orders (  
    id INT NOT NULL AUTO_INCREMENT,  
    oid varchar(32) NOT NULL default '', 
        money decimal(19,4) NOT NULL default 0,
        state TINYINT NOT NULL default 0,
    time DATETIME NOT NULL default '1971-01-01 01:00:00',  
    PRIMARY KEY (id)  
)AUTO_INCREMENT= 1 ENGINE=InnoDB DEFAULT CHARSET=utf8;

<h3>3. MyCat配置 <h3>

MyCat配置官方文档.

mycat 的配置文件在conf下:

image.png

为实现下图：

image.png

配置如下：

server.xml


<?xml version="1.0" encoding="UTF-8"?>  
<!DOCTYPE mycat:server SYSTEM "server.dtd">  
<mycat:server xmlns:mycat="http://io.mycat/">  
        <system> 
                <property name="defaultSqlParser">druidparser</property>  
                <property name="mutiNodeLimitType">1</property>  
                <property name="serverPort">8066</property>    
                <property name="managerPort">9066</property>   
        </system>  
        <!-- mycat 的用户名,密码,数据库  -->  
        <user name="test">  
                <property name="password">123456</property>  
                <property name="schemas">JGDB</property>  
        </user>  

        <user name="user">  
                <property name="password">123456</property>  
                <property name="schemas">JGDB</property>  
                <property name="readOnly">true</property>  
        </user>  
</mycat:server>

rule.xml


<?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="order_rule">
        <rule>
            <columns>id</columns>
            <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>
    </function>
</mycat:rule>

schema.xml


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

    <!-- 设置表的存储方式.schema name="JGDB" 与 server.xml中的 JGDB 设置一致  -->  
    <schema name="JGDB" checkSQLschema="false" sqlMaxLimit="100">  
        <table name="users" primaryKey="id"  dataNode="db1" />  
        <table name="orders" primaryKey="id" dataNode="db2,db3" rule="order_rule" />  

    </schema>  

    <!-- 设置dataNode 对应的数据库,及 mycat 连接的地址dataHost -->  
    <dataNode name="db1" dataHost="host1" database="db1" />  
    <dataNode name="db2" dataHost="host1" database="db2" />  
    <dataNode name="db3" dataHost="host1" database="db3" />  

    <!-- mycat 逻辑主机dataHost对应的物理主机.其中也设置对应的mysql登陆信息 -->  
    <dataHost name="host1" maxCon="1000" minCon="10" balance="0" writeType="0" dbType="mysql" dbDriver="native">  
            <heartbeat></heartbeat>  
            <writeHost host="server1" url="127.0.0.1:3306" user="root" password="xinfu978"/>  
    </dataHost> 

</mycat:schema>