windows下使用MYCAT实现mysql的读写分离

这里的mycat是在win10上搭建的

1. 下载mycat，下载地址是：
   http://dl.mycat.org.cn/1.6-RELEASE/

2. 解压mycat，得到以下目录
   

3. 配置server.xml。server.xml中只配置了user标签，user标签配置的是mycat逻辑库的用户名和密码

<?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:server SYSTEM "server.dtd">
<mycat:server xmlns:mycat="http://io.mycat/">
	<system>
	<property name="useSqlStat">0</property>  <!-- 1为开启实时统计、0为关闭 -->
	<property name="useGlobleTableCheck">0</property>  <!-- 1为开启全加班一致性检测、0为关闭 -->

		<property name="sequnceHandlerType">2</property>
      <!--  <property name="useCompression">1</property>--> <!--1为开启mysql压缩协议-->
        <!--  <property name="fakeMySQLVersion">5.6.20</property>--> <!--设置模拟的MySQL版本号-->
	<!-- <property name="processorBufferChunk">40960</property> -->
	<!-- 
	<property name="processors">1</property> 
	<property name="processorExecutor">32</property> 
	 -->
		<!--默认为type 0: DirectByteBufferPool | type 1 ByteBufferArena-->
		<property name="processorBufferPoolType">0</property>
		<!--默认是65535 64K 用于sql解析时最大文本长度 -->
		<!--<property name="maxStringLiteralLength">65535</property>-->
		<!--<property name="sequnceHandlerType">0</property>-->
		<!--<property name="backSocketNoDelay">1</property>-->
		<!--<property name="frontSocketNoDelay">1</property>-->
		<!--<property name="processorExecutor">16</property>-->
		<!--
			<property name="serverPort">8066</property> <property name="managerPort">9066</property> 
			<property name="idleTimeout">300000</property> <property name="bindIp">0.0.0.0</property> 
			<property name="frontWriteQueueSize">4096</property> <property name="processors">32</property> -->
		<!--分布式事务开关，0为不过滤分布式事务，1为过滤分布式事务（如果分布式事务内只涉及全局表，则不过滤），2为不过滤分布式事务,但是记录分布式事务日志-->
		<property name="handleDistributedTransactions">0</property>
		
			<!--
			off heap for merge/order/group/limit      1开启   0关闭
		-->
		<property name="useOffHeapForMerge">1</property>

		<!--
			单位为m
		-->
		<property name="memoryPageSize">1m</property>

		<!--
			单位为k
		-->
		<property name="spillsFileBufferSize">1k</property>

		<property name="useStreamOutput">0</property>

		<!--
			单位为m
		-->
		<property name="systemReserveMemorySize">384m</property>


		<!--是否采用zookeeper协调切换  -->
		<property name="useZKSwitch">true</property>


	</system>
	
	<!-- 全局SQL防火墙设置 -->
	<!-- 
	<firewall> 
	   <whitehost>
	      <host host="127.0.0.1" user="mycat"/>
	      <host host="127.0.0.2" user="mycat"/>
	   </whitehost>
       <blacklist check="false">
       </blacklist>
	</firewall>
	-->
	
	<user name="root">
		<property name="password">root</property>
		<property name="schemas">nontaxdb</property>
		
		<!-- 表级 DML 权限设置 -->
		<!-- 		
		<privileges check="false">
			<schema name="nontaxdb" dml="0110" >
				<table name="tb01" dml="0000"></table>
				<table name="tb02" dml="1111"></table>
			</schema>
		</privileges>		
		 -->
	</user>

	<user name="user">
		<property name="password">user</property>
		<property name="schemas">nontaxdb</property>
		<property name="readOnly">true</property>
	</user>

</mycat:server>

4. 配置schema.xml。

<?xml version="1.0"?>
<!DOCTYPE mycat:schema SYSTEM "schema.dtd">
<mycat:schema xmlns:mycat="http://io.mycat/">
	<!--nontaxdb表示mycat的逻辑数据库名称
                   当schema节点没有子节点table的时候，一定要有dataNode属性存在（指向mysql真实数据库），
    -->
	<schema name="nontaxdb" checkSQLschema="false" sqlMaxLimit="100" dataNode="dn1">
	</schema>
	<!--指定master的数据库db1-->
	<dataNode name="dn1" dataHost="localhost1" database="nontaxdb" />
	<!--指定mastet的ip -->
	<dataHost name="localhost1" maxCon="1000" minCon="10" balance="1"
			  writeType="0" dbType="mysql" dbDriver="native" switchType="1"  slaveThreshold="100">
		<!--表示mysql的心跳状态-->
		<heartbeat>select user()</heartbeat>
		<!-- can have multi write hosts   master负责写 -->
		<writeHost host="hostM1" url="localhost:3306" user="root" password="root">
			<!-- can have multi read hosts  slave负责读-->
			<readHost host="hostS1" url="localhost:3307" user="root" password="root" />
		</writeHost>
		<!-- <writeHost host="hostS1" url="localhost:3307" user="root" password="root" /> -->
	</dataHost>
</mycat:schema>

5. 以上就实现了读写分离。

如果想配置分库、分表等，参考这篇文章，我还没有详细研究。。

6. mycat默认的管理端口是9066，可以登陆进去，管理mycat，以下是一些常用的命令。

D:\Program Files\mysql-5.7.30-winx64\bin>mysql -uroot -proot -P9066

#查看帮助命令
mysql>show @@help;
#加载mycat配置文件，但是并不是所有的都能够通过该命令加载的，还需要对mycat进行重启，后期还会有mycat高可用方案。
mysql>reload @@config;  
#查看mycat中配置的节点详情
mysql>show @@datanode;
#查看mycat后端的物理数据库的详情
mysql>show @@datasource;
#查看后端的数据库的连接情况
mysql>show @@backend;