windows下使用MYCAT實現mysql的讀寫分離

這裏的mycat是在win10上搭建的

1. 下載mycat，下載地址是：
   http://dl.mycat.org.cn/1.6-RELEASE/

2. 解壓mycat，得到以下目錄
   

3. 配置server.xml。server.xml中只配置了user標籤，user標籤配置的是mycat邏輯庫的用戶名和密碼

<?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爲開啓實時統計、0爲關閉 -->
	<property name="useGlobleTableCheck">0</property>  <!-- 1爲開啓全加班一致性檢測、0爲關閉 -->

		<property name="sequnceHandlerType">2</property>
      <!--  <property name="useCompression">1</property>--> <!--1爲開啓mysql壓縮協議-->
        <!--  <property name="fakeMySQLVersion">5.6.20</property>--> <!--設置模擬的MySQL版本號-->
	<!-- <property name="processorBufferChunk">40960</property> -->
	<!-- 
	<property name="processors">1</property> 
	<property name="processorExecutor">32</property> 
	 -->
		<!--默認爲type 0: DirectByteBufferPool | type 1 ByteBufferArena-->
		<property name="processorBufferPoolType">0</property>
		<!--默認是65535 64K 用於sql解析時最大文本長度 -->
		<!--<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> -->
		<!--分佈式事務開關，0爲不過濾分佈式事務，1爲過濾分佈式事務（如果分佈式事務內只涉及全局表，則不過濾），2爲不過濾分佈式事務,但是記錄分佈式事務日誌-->
		<property name="handleDistributedTransactions">0</property>
		
			<!--
			off heap for merge/order/group/limit      1開啓   0關閉
		-->
		<property name="useOffHeapForMerge">1</property>

		<!--
			單位爲m
		-->
		<property name="memoryPageSize">1m</property>

		<!--
			單位爲k
		-->
		<property name="spillsFileBufferSize">1k</property>

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

		<!--
			單位爲m
		-->
		<property name="systemReserveMemorySize">384m</property>


		<!--是否採用zookeeper協調切換  -->
		<property name="useZKSwitch">true</property>


	</system>
	
	<!-- 全局SQL防火牆設置 -->
	<!-- 
	<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>
		
		<!-- 表級 DML 權限設置 -->
		<!-- 		
		<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/">

	<schema name="nontaxdb" checkSQLschema="false" sqlMaxLimit="100" dataNode="dn1">
		
	</schema>
	<dataNode name="dn1" dataHost="localhost1" database="nontaxdb" />
	<dataHost name="localhost1" maxCon="1000" minCon="10" balance="1"
			  writeType="0" dbType="mysql" dbDriver="native" switchType="1"  slaveThreshold="100">
		<heartbeat>select user()</heartbeat>
		<!-- can have multi write hosts -->
		<writeHost host="hostM1" url="localhost:3306" user="root" password="root">
			<!-- can have multi read hosts -->
			<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. 以上就實現了讀寫分離。

如果想配置分庫、分表等，參考這篇文章，我還沒有詳細研究。。

6. mycat默認的管理端口是9066，可以登陸進去，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

#查看幫助命令
mysql>show @@help;
#加載mycat配置文件，但是並不是所有的都能夠通過該命令加載的，還需要對mycat進行重啓，後期還會有mycat高可用方案。
mysql>reload @@config;  
#查看mycat中配置的節點詳情
mysql>show @@datanode;
#查看mycat後端的物理數據庫的詳情
mysql>show @@datasource;
#查看後端的數據庫的連接情況
mysql>show @@backend;