mycat1.6.5 入门搭建

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作为分布式数据库中间插件，mycat入门配置很简单(我感觉是这样，除了遇到了坑~~)先放几个学习的时候看到的博客，先留着。

官网:http://www.mycat.io/

mycat下载地址:http://dl.mycat.io/

mycat简介：https://blog.csdn.net/wrs120/article/details/80417345

mycat schema.xml详解：https://blog.csdn.net/linlinv3/article/details/51777324

mycat最主要配置文件有三个，server.xml、schema.xml、与rule.xml。其中server.xml：是Mycat服务器参数调整和用户授权的配置文件。schema.xml：是逻辑库定义和表以及分片定义的配置文件。rule.xml：  是分片规则的配置文件，分片规则的具体一些参数信息单独存放为文件。

server.xml配置，需要修改的有:登陆的账户密码、逻辑数据库。此处设置的登陆账户名密码是root / xichuan123456，逻辑数据库是db_xichuan。mycat默认的服务端口是8066，默认的管理端口是9066。

<?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="nonePasswordLogin">0</property> <!-- 0为需要密码登陆、1为不需要密码登陆 ,默认为0，设置为1则需要指定默认账户-->
	<property name="useHandshakeV10">1</property>
	<property name="useSqlStat">1</property>  <!-- 1为开启实时统计、0为关闭 -->
	<property name="useGlobleTableCheck">1</property>  <!-- 1为开启全加班一致性检测、0为关闭 -->

		<property name="sequnceHandlerType">2</property>
	<property name="subqueryRelationshipCheck">false</property> <!-- 子查询中存在关联查询的情况下,检查关联字段中是否有分片字段 .默认 false -->
		<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">64k</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">false</property>

		<!-- XA Recovery Log日志路径 -->
		<!--<property name="XARecoveryLogBaseDir">./</property>-->

		<!-- XA Recovery Log日志名称 -->
		<!--<property name="XARecoveryLogBaseName">tmlog</property>-->

	</system>
	
	<!-- 全局SQL防火墙设置 -->
	<!--白名单可以使用通配符%或着*-->
	<!--例如<host host="127.0.0.*" user="root"/>-->
	<!--例如<host host="127.0.*" user="root"/>-->
	<!--例如<host host="127.*" user="root"/>-->
	<!--例如<host host="1*7.*" user="root"/>-->
	<!--这些配置情况下对于127.0.0.1都能以root账户登录-->
	<!--
	<firewall>
		<whitehost>
			<host host="1*7.0.0.*" user="root"/>
		</whitehost>
		<blacklist check="false">
		</blacklist>
	</firewall>
	-->

	<user name="root" defaultAccount="true">
		<property name="password">xichuan123456</property>
		<property name="schemas">db_xichuan</property>
		
		<!-- 表级 DML 权限设置 -->
		<!-- 		
		<privileges check="false">
			<schema name="TESTDB" 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">db_xichuan</property>
		<property name="readOnly">true</property>
	</user>

</mycat:server>

配置schema.xml。其中逻辑数据库db_xichuan中配置两张表：user、info。其中与三个节点，dn1、dn2、dn3，他们使用的连接源都是localhost1，对应的数据库分别是：mycat1、mycat2、mycat3。且逻辑表user对应的是mycat1数据库中的user表，逻辑表info对应的是mycat2、mycat3数据库中的info表。rule="mod-long"代表切分规则。

 checkSQLschema="true"，不然会遇到错误，解决问题博客：https://blog.csdn.net/zc_ad/article/details/83540995

<?xml version="1.0"?>
<!DOCTYPE mycat:schema SYSTEM "schema.dtd">
<mycat:schema xmlns:mycat="http://io.mycat/">
		
	<!--注意 checkSQLschema="true"，不然会报错-->
	<schema name="db_xichuan" checkSQLschema="true" sqlMaxLimit="100" >
		<table name="user" primaryKey="id" dataNode="dn1" type="global" />
		<table name="info" primaryKey="id" dataNode="dn2,dn3" rule="mod-long" />
	</schema>

	<dataNode name="dn1" dataHost="localhost1" database="mycat1" />
	<dataNode name="dn2" dataHost="localhost1" database="mycat2" />
	<dataNode name="dn3" dataHost="localhost1" database="mycat3" />
        <!--真正数据库连接地址-->
	<dataHost name="localhost1" maxCon="1000" minCon="10" balance="0"
			  writeType="0" dbType="mysql" dbDriver="native" switchType="1"  slaveThreshold="100">
		<heartbeat>select user()</heartbeat>
		<writeHost host="hostS1" url="12.12.12.12:3306" user="root"
				   password="xichuan123456" />
	</dataHost>
	
</mycat:schema>

他们的对应关系如下简图：

rule.xml配置

<?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="rule1">
		<rule>
			<columns>id</columns>
			<algorithm>func1</algorithm>
		</rule>
	</tableRule>

	<tableRule name="rule2">
		<rule>
			<columns>user_id</columns>
			<algorithm>func1</algorithm>
		</rule>
	</tableRule>

	<tableRule name="sharding-by-intfile">
		<rule>
			<columns>sharding_id</columns>
			<algorithm>hash-int</algorithm>
		</rule>
	</tableRule>
	<tableRule name="auto-sharding-long">
		<rule>
			<columns>id</columns>
			<algorithm>rang-long</algorithm>
		</rule>
	</tableRule>
	<tableRule name="mod-long">
		<rule>
			<columns>id</columns>
			<algorithm>mod-long</algorithm>
		</rule>
	</tableRule>
	<tableRule name="sharding-by-murmur">
		<rule>
			<columns>id</columns>
			<algorithm>murmur</algorithm>
		</rule>
	</tableRule>
	<tableRule name="crc32slot">
		<rule>
			<columns>id</columns>
			<algorithm>crc32slot</algorithm>
		</rule>
	</tableRule>
	<tableRule name="sharding-by-month">
		<rule>
			<columns>create_time</columns>
			<algorithm>partbymonth</algorithm>
		</rule>
	</tableRule>
	<tableRule name="latest-month-calldate">
		<rule>
			<columns>calldate</columns>
			<algorithm>latestMonth</algorithm>
		</rule>
	</tableRule>
	
	<tableRule name="auto-sharding-rang-mod">
		<rule>
			<columns>id</columns>
			<algorithm>rang-mod</algorithm>
		</rule>
	</tableRule>
	
	<tableRule name="jch">
		<rule>
			<columns>id</columns>
			<algorithm>jump-consistent-hash</algorithm>
		</rule>
	</tableRule>

	<function name="murmur"
		class="io.mycat.route.function.PartitionByMurmurHash">
		<property name="seed">0</property><!-- 默认是0 -->
		<property name="count">2</property><!-- 要分片的数据库节点数量，必须指定，否则没法分片 -->
		<property name="virtualBucketTimes">160</property><!-- 一个实际的数据库节点被映射为这么多虚拟节点，默认是160倍，也就是虚拟节点数是物理节点数的160倍 -->
		<!-- <property name="weightMapFile">weightMapFile</property> 节点的权重，没有指定权重的节点默认是1。以properties文件的格式填写，以从0开始到count-1的整数值也就是节点索引为key，以节点权重值为值。所有权重值必须是正整数，否则以1代替 -->
		<!-- <property name="bucketMapPath">/etc/mycat/bucketMapPath</property> 
			用于测试时观察各物理节点与虚拟节点的分布情况，如果指定了这个属性，会把虚拟节点的murmur hash值与物理节点的映射按行输出到这个文件，没有默认值，如果不指定，就不会输出任何东西 -->
	</function>

	<function name="crc32slot"
			  class="io.mycat.route.function.PartitionByCRC32PreSlot">
		<property name="count">2</property><!-- 要分片的数据库节点数量，必须指定，否则没法分片 -->
	</function>
	<function name="hash-int"
		class="io.mycat.route.function.PartitionByFileMap">
		<property name="mapFile">partition-hash-int.txt</property>
	</function>
	<function name="rang-long"
		class="io.mycat.route.function.AutoPartitionByLong">
		<property name="mapFile">autopartition-long.txt</property>
	</function>
	<function name="mod-long" class="io.mycat.route.function.PartitionByMod">
		<!-- how many data nodes -->
		<property name="count">2</property>
	</function>

	<function name="func1" class="io.mycat.route.function.PartitionByLong">
		<property name="partitionCount">8</property>
		<property name="partitionLength">128</property>
	</function>
	<function name="latestMonth"
		class="io.mycat.route.function.LatestMonthPartion">
		<property name="splitOneDay">24</property>
	</function>
	<function name="partbymonth"
		class="io.mycat.route.function.PartitionByMonth">
		<property name="dateFormat">yyyy-MM-dd</property>
		<property name="sBeginDate">2015-01-01</property>
	</function>
	
	<function name="rang-mod" class="io.mycat.route.function.PartitionByRangeMod">
        	<property name="mapFile">partition-range-mod.txt</property>
	</function>
	
	<function name="jump-consistent-hash" class="io.mycat.route.function.PartitionByJumpConsistentHash">
		<property name="totalBuckets">3</property>
	</function>
</mycat:rule>

在官网上下载mycat

1.使用命令进行解压：tar xzvf Mycat-server-1.6.5-release-20180122220033-linux.tar.gz，然后进入conf目录下，将上面三个文件覆盖，然后启动mycat。

2.进入mycat/bin目录 ，

启动命令：./mycat start

停止命令：./mycat stop

重启命令：./mycat restart

查看状态命令：./mycat status。

3.进入mycat/log目录，查看日志:tail -f mycat.log。查看是否报错。

4.使用Navicat进行连接

 

附件：数据库以及表的创建

create DATABASE mycat1;
use mycat1;

CREATE TABLE `user`  (
  `id` bigint(20) NOT NULL AUTO_INCREMENT,
  `name` varchar(50) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  PRIMARY KEY (`id`) USING BTREE
);
INSERT INTO `user` VALUES (1, 'mycat1_user_1');
INSERT INTO `user` VALUES (2, 'mycat1_user_2');





create DATABASE mycat2;
use mycat2;

CREATE TABLE `info`  (
  `id` bigint(20) NOT NULL AUTO_INCREMENT,
  `name` varchar(50) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  PRIMARY KEY (`id`) USING BTREE
) ;
INSERT INTO `info` VALUES (14, 'mycat2_info_1');
INSERT INTO `info` VALUES (15, 'mycat2_info_2');






create DATABASE mycat3;
use mycat3;

CREATE TABLE `info`  (
  `id` bigint(20) NOT NULL AUTO_INCREMENT,
  `name` varchar(50) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  PRIMARY KEY (`id`) USING BTREE
) ;
INSERT INTO `info` VALUES (14, 'mycat3_info_1');
INSERT INTO `info` VALUES (15, 'mycat3_info_2');

搭建成功后的效果如下: