下载 mycat 以及 jdk
配置数据库节点，实例如下
1 <?xml version="1.0"?> 2 <!DOCTYPE mycat:schema SYSTEM "schema.dtd"> 3 <mycat:schema xmlns:mycat="http://io.mycat/"> 4 5 <!--<schema name="TESTDB" checkSQLschema="false" sqlMaxLimit="100">--> 6 7 <!--<table name="travelrecord" dataNode="dn1,dn2" rule="auto-sharding-long" />--> 8 9 <!-- <table name="test1_0" dataNode="dn1,dn2,dn3" rule="auto-sharding-long" ruleRequired="false" /> 10 11 <table name="company" primaryKey="ID" type="global" dataNode="dn1,dn2,dn3" rule="mod-long" /> 12 <table name="goods" primaryKey="ID" type="global" dataNode="dn1,dn2" /> 13 14 <table name="hotnews" primaryKey="ID" dataNode="dn1,dn2,dn3" rule="mod-long" /> 15 16 <table name="employee" primaryKey="ID" dataNode="dn1,dn2" rule="sharding-by-intfile" /> 17 18 <table name="customer" primaryKey="ID" dataNode="dn1,dn2" rule="sharding-by-intfile"> 19 <childTable name="orders" primaryKey="ID" joinKey="customer_id" 20 parentKey="id"> 21 <childTable name="order_items" joinKey="order_id" 22 parentKey="id" /> 23 </childTable> 24 <childTable name="customer_addr" primaryKey="ID" joinKey="customer_id" 25 parentKey="id" /> 26 </table> 27 </schema> 28 29 <dataNode name="dn1" dataHost="localhost1" database="db1" /> 30 <dataNode name="dn2" dataHost="localhost2" database="db2" /> 31 <dataNode name="dn3" dataHost="localhost2" database="db3" /> 32 <dataHost name="localhost1" maxCon="1000" minCon="10" balance="0" 33 writeType="0" dbType="mysql" dbDriver="native" > 34 <heartbeat>select user()</heartbeat> 35 <writeHost host="hostM1" url="127.0.0.1:3306" user="root" 36 password="130139"> 37 </writeHost> 38 </dataHost> 39 40 41 <dataHost name="localhost2" maxCon="1000" minCon="10" balance="0" 42 writeType="0" dbType="mysql" dbDriver="native" > 43 <heartbeat>select user()</heartbeat> 44 <writeHost host="hostM1" url="192.168.3.250:3306" user="root" 45 password="130139"> 46 </writeHost> 47 </dataHost>--> 48 49 50 <schema name="TESTDB" checkSQLschema="false" sqlMaxLimit="100"> 51 <!-- 垂直切分 --> 52 <table name="test1" primaryKey="id" type="global" dataNode="nodeTest1" > 53 </table> 54 <table name="test2" primaryKey="id" type="global" dataNode="nodeTest2" > 55 </table> 56 57 <!-- 全局表的配置如下(比如配置文件的数据，数据不大很少变动的，但是经常用到查询的) --> 58 <!-- <table name="t_area" primaryKey="id" type="global" dataNode="dn1,dn2" /> --> 59 60 <!-- 水平切分 --> 61 <!-- ER分片表:如user表和user_detail表的关联字段user_id；保证相同user_id的数据在同一块片区上 --> 62 <table name="user" primaryKey="user_id" dataNode="nodeUser01,nodeUser02" rule="mod-long"> 63 <childTable name="user_detail" primaryKey="id" joinKey="user_id" parentKey="user_id"> 64 </childTable> 65 </table> 66 </schema> 67 68 69 70 71 <dataNode name="nodeUser01" dataHost="dataHost01" database="db3" /> 72 <dataNode name="nodeUser02" dataHost="dataHost02" database="db3" /> 73 74 <dataNode name="nodeTest1" dataHost="dataHost01" database="db1" /> 75 <dataNode name="nodeTest2" dataHost="dataHost02" database="db1" /> 76 77 78 79 <dataHost name="dataHost01" maxCon="1000" minCon="10" balance="0" writeType="0" dbType="mysql" dbDriver="native"> 80 <heartbeat>select user()</heartbeat> 81 <writeHost host="hostM1" url="127.0.0.1:3306" user="root" password="130139"/> 82 </dataHost> 83 84 <dataHost name="dataHost02" maxCon="1000" minCon="10" balance="0" writeType="0" dbType="mysql" dbDriver="native"> 85 <heartbeat>select user()</heartbeat> 86 <writeHost host="hostM1" url="192.168.3.250:3306" user="root" password="130139"/> 87 </dataHost> 88 89 </mycat:schema>
配置节点中建议参考官方文档 http://www.mycat.io/document/mycat-definitive-guide.pdf 可以少走弯路
这里重点配置JDK安装的路径 就是此处
这个文件重点配置它们的分片规则
这个文件则主要是设定逻辑数据库即 127.0.0.1:8066 的数据库名称，用户名以及密码
示例如下
1 <?xml version="1.0" encoding="UTF-8"?> 2 <!-- - - Licensed under the Apache License, Version 2.0 (the "License"); 3 - you may not use this file except in compliance with the License. - You 4 may obtain a copy of the License at - - http://www.apache.org/licenses/LICENSE-2.0 5 - - Unless required by applicable law or agreed to in writing, software - 6 distributed under the License is distributed on an "AS IS" BASIS, - WITHOUT 7 WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - See the 8 License for the specific language governing permissions and - limitations 9 under the License. --> 10 <!DOCTYPE mycat:server SYSTEM "server.dtd"> 11 <mycat:server xmlns:mycat="http://io.mycat/"> 12 <system> 13 <property name="defaultSqlParser">druidparser</property> 14 <!--<property name="useSqlStat">0</property>--> <!-- 1为开启实时统计、0为关闭 --> 15 <!--<property name="useGlobleTableCheck">0</property>--> <!-- 1为开启全加班一致性检测、0为关闭 --> 16 17 <!--<property name="sequnceHandlerType">2</property>--> 18 <!-- <property name="useCompression">1</property>--> <!--1为开启mysql压缩协议--> 19 <!-- <property name="fakeMySQLVersion">5.6.20</property>--> <!--设置模拟的MySQL版本号--> 20 <!-- <property name="processorBufferChunk">40960</property> --> 21 <!-- 22 <property name="processors">1</property> 23 <property name="processorExecutor">32</property> 24 --> 25 <!--默认为type 0: DirectByteBufferPool | type 1 ByteBufferArena--> 26 <!--<property name="processorBufferPoolType">0</property>--> 27 <!--默认是65535 64K 用于sql解析时最大文本长度 --> 28 <!--<property name="maxStringLiteralLength">65535</property>--> 29 <!--<property name="sequnceHandlerType">0</property>--> 30 <!--<property name="backSocketNoDelay">1</property>--> 31 <!--<property name="frontSocketNoDelay">1</property>--> 32 <!--<property name="processorExecutor">16</property>--> 33 <!-- 34 <property name="serverPort">8066</property> <property name="managerPort">9066</property> 35 <property name="idleTimeout">300000</property> <property name="bindIp">0.0.0.0</property> 36 <property name="frontWriteQueueSize">4096</property> <property name="processors">32</property> --> 37 <!--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--> 38 <!--<property name="handleDistributedTransactions">0</property>--> 39 40 <!-- 41 off heap for merge/order/group/limit 1开启 0关闭 42 --> 43 <!--<property name="useOffHeapForMerge">1</property>--> 44 45 <!-- 46 单位为m 47 --> 48 <!--<property name="memoryPageSize">1m</property>--> 49 50 <!-- 51 单位为k 52 --> 53 <!--<property name="spillsFileBufferSize">1k</property>--> 54 55 <!--<property name="useStreamOutput">0</property>--> 56 57 <!-- 58 单位为m 59 --> 60 <!--<property name="systemReserveMemorySize">384m</property>--> 61 62 63 <!--是否采用zookeeper协调切换 --> 64 <!--<property name="useZKSwitch">true</property>--> 65 66 67 </system> 68 69 <!-- 全局SQL防火墙设置 --> 70 <!-- 71 <firewall> 72 <whitehost> 73 <host host="127.0.0.1" user="mycat"/> 74 <host host="127.0.0.2" user="mycat"/> 75 </whitehost> 76 <blacklist check="false"> 77 </blacklist> 78 </firewall> 79 --> 80 81 <user name="root"> 82 <property name="password">130139</property> 83 <property name="schemas">TESTDB</property> 84 85 <!-- 表级 DML 权限设置 --> 86 <!-- 87 <privileges check="false"> 88 <schema name="TESTDB" dml="0110" > 89 <table name="tb01" dml="0000"></table> 90 <table name="tb02" dml="1111"></table> 91 </schema> 92 </privileges> 93 --> 94 </user> 95 96 <user name="user"> 97 <property name="password">user</property> 98 <property name="schemas">TESTDB</property> 99 <property name="readOnly">true</property> 100 </user> 101 102 </mycat:server>
mycat install 安装
mycat start 开启
mycat stop 停止
配置文件修改后，需要重启 mycat
记录点参考网址 https://blog.csdn.net/leipeng321123/article/details/50401376
https://www.cnblogs.com/parryyang/p/5758087.html
https://www.cnblogs.com/rangle/archive/2018/01/02/8176362.html
https://blog.csdn.net/qiaoshuai0920/article/details/52346332
另外，一定要看官方文档 http://www.mycat.io/document/mycat-definitive-guide.pdf
原文：https://www.cnblogs.com/cwmizlp/p/9419420.html