大觅网项目-使用mycat测试分库分表
作者：互联网
1.业务理解：
垂直切分
业务维度
水平切分
数据维度
混合切分
业务+数据
2.定义
基于MySQL的数据库中间件，用来协调切分后的数据库，使其可以进行统一管理
逻辑库
数据库集群对外的统一访问入口
3.思路：
1.schema.xml
配置参数:逻辑库,逻辑表,数据节点,节点主机
2.rule.xml
3.server.xml
4.基础概念：
1.schema.xml 逻辑库,逻辑表,数据节点,节点主机
附注:balance="0"---->不进行读写分离
writeHost------>代表是写服务器
writeType="0"---->所有的写操作都发到第一个写服务器(从上到下，如果有服务器宕机,则往下追溯)
writeType="1"---->随机分发，不按照顺序
dbDriver="native"--->mysql和mycat高度兼容，如果是连接oracle就不能配置成native
案例：
<?xml version="1.0"?>
<!DOCTYPE mycat:schema SYSTEM "schema.dtd">
<mycat:schema xmlns:mycat="http://io.mycat/">
<schema name="dm_order" checkSQLschema="true" sqlMaxLimit="100">
<table name="dm_order" primaryKey="id" autoIncrement="true" dataNode="dn1,dn2,dn3"
rule="auto-sharding-rang-mod-order"/>
<dataNode name="dn1" dataHost="a" database="dm_order1"/>
<dataNode name="dn2" dataHost="a" database="dm_order2"/>
<dataNode name="dn3" dataHost="a" database="dm_order3"/>
<dataHost name="a" maxCon="1000" minCon="10" balance="0"
writeType="0" dbType="mysql"
dbDriver="native" switchType="1" slaveThreshold="100">
<heartbeat>select 1</heartbeat>
<writeHost host="hostM1"
url="192.168.115.157:3306" user="root" password="123456">
</writeHost>
</dataHost>
</mycat:schema>
2.rule.xml 分片规则
附注:
<!DOCTYPE mycat:rule SYSTEM "rule.dtd">
<mycat:rule xmlns:mycat="http://io.mycat/">
<tableRule name="auto-sharding-rang-mod-order">
<rule>
<columns>id</columns>
<algorithm>rang-mod-dm</algorithm>
</rule>
</tableRule>
<function name="rang-mod-dm" class="io.mycat.route.function.PartitionByMod">
<property name="count">3</property>
</function>
</mycat:rule>
3.server.xml 连接mycat的用户信息(用户名,密码)
<user name="root">
<property name="password">123456</property>
<property name="schemas">dm_order</property>
</user>
5.步骤：
一.准备三个xml文件
案例：
1.schema.xml:
<?xml version="1.0"?>
<!DOCTYPE mycat:schema SYSTEM "schema.dtd">
<mycat:schema xmlns:mycat="http://io.mycat/">
<schema name="dm_order" checkSQLschema="true" sqlMaxLimit="100">
<table name="dm_order" primaryKey="id" autoIncrement="true" dataNode="dn1,dn2,dn3"
rule="auto-sharding-rang-mod-order"/>
</schema>
<dataNode name="dn1" dataHost="a" database="dm_order1"/>
<dataNode name="dn2" dataHost="a" database="dm_order2"/>
<dataNode name="dn3" dataHost="a" database="dm_order3"/>
<dataHost name="a" maxCon="1000" minCon="10" balance="0"
writeType="0" dbType="mysql"
dbDriver="native" switchType="1" slaveThreshold="100">
<heartbeat>select 1</heartbeat>
<writeHost host="hostM1"
url="192.168.115.158:3306" user="root" password="123456">
</writeHost>
</dataHost>
</mycat:schema>
2.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="auto-sharding-rang-mod-order">
<rule>
<columns>id</columns>
<algorithm>rang-mod-dm</algorithm>
</rule>
</tableRule>
<function name="rang-mod-dm" class="io.mycat.route.function.PartitionByMod">
<property name="count">3</property>
</function>
</mycat:rule>
3.server.xml:
案例：
<?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">123456</property>
<property name="schemas">dm_order</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>
</mycat:server>
二、将三个配置文件用ftp的方式上传到linux的root目录下
三、打开shell,进入存放三个xml文件的目录 cd /root/xxx
(目的：将宿主机中的三个xml文件复制到mycat容器中的/usr/local/mycat/conf目录)
docker cp server.xml springcloudv20_mycat_1:/usr/local/mycat/conf
docker cp rule.xml springcloudv20_mycat_1:/usr/local/mycat/conf
docker cp schema.xml springcloudv20_mycat_1:/usr/local/mycat/conf
四、测试
1.重新启动mycat
2.连接mycat的逻辑库，端口号8066
3.连接mysql的实体库,端口号3306
4.使用sqlyog测试分库。
5.//springboot+mybatis实现分库分表
标签：xml,大觅网,分库,License,--,rule,mycat,order 来源： https://www.cnblogs.com/lyabbk/p/16163363.html