mycat的使用 - wtdig/study GitHub Wiki

mycat使用简介

参考资料

一、mycat的安装

下载mycat的安装包,解压即可(以1.6版本为例)

二、mycat的文件配置

1)配置server.xml文件

<?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="user">
		<property name="password">user</property>
		<property name="schemas">TESTDB</property>
		<property name="readOnly">true</property>
	</user>
	-->
	
	<user name="wt">
		<property name="password">root</property>
		<property name="schemas">code_generator</property>
		<property name="readOnly">false</property>
	</user>

</mycat:server>

配置一个用户:用户名wt,密码root,数据库名称code_generator,数据库权限读写

2)配置schema.xml文件(实现读写分离功能)

<?xml version="1.0"?>
<!DOCTYPE mycat:schema SYSTEM "schema.dtd">
<mycat:schema xmlns:mycat="http://io.mycat/">
	<!-- 数据库配置,与server.xml中的数据库对应 -->
    <schema name="code_generator" checkSQLschema="false" sqlMaxLimit="100">
        <table name="code_generator_demo" primaryKey="id" autoIncrement="true" dataNode="dn1"  /> 
    </schema>

    <!-- 分片配置 -->
    <dataNode name="dn1" dataHost="test1" database="code_generator" />

    <!-- 物理数据库配置 -->
    <dataHost name="test1" maxCon="1000" minCon="10" balance="1"  writeType="0" dbType="mysql" dbDriver="native">
        <heartbeat>select user();</heartbeat>
        <writeHost host="hostM1" url="127.0.0.1:3306" user="root" password="root">  
			<readHost host="hostM1" url="45.78.9.159:3306" user="root" password="root"></readHost>
        </writeHost>
    </dataHost>

</mycat:schema>

数据库code_generator,数据库中的表code_generator_demo,127.0.0.1:3306地址的数据库的code_generator_demo表进行写操作; 45.78.9.159:3306地址的数据库的code_generator_demo表进行读操作;

三、mycat的启动

打开mycat,bin目录下的startup_nowrap.bat(window版本的启动命令)

四、mycat的测试使用(java代码)

修改jdbc.properties配置文件:

jdbc.url=jdbc:mysql://localhost:8066/code_generator?useUnicode=true&characterEncoding=utf8

端口号不一样了:8066

注意:用户名和密码要对应的修改

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