本篇内容介绍了“MyCat怎么实现分库分表”的有关知识，在实际案例的操作过程中，不少人都会遇到这样的困境，接下来就让小编带领大家学习一下如何处理这些情况吧！希望大家仔细阅读，能够学有所成！
项目环境：
192.168.8.30 mycat
192.168.8.31 node1
192.168.8.32 node2
192.168.8.33 node3
三个节点MySQL均为单实例
一、创建测试库
node1
create database testdb01; create database testdb02; create database testdb03;
node2
create database testdb13; create database testdb14; create database testdb15;
node3
create database testdb25; create database testdb26; create database testdb27;
二、配置schema.xml
<?xml version="1.0"?> <!DOCTYPE mycat:schema SYSTEM "schema.dtd"> <mycat:schema xmlns:mycat="http://io.mycat/"> <schema name="mycatdb" checkSQLschema="false" sqlMaxLimit="100"> <table name="user04" dataNode="dn$1-3,dn$13-15,dn$25-27" rule="sharding-by-murmur-user04-id"></table> </schema> <!-- <dataNode name="dn1$0-743" dataHost="localhost1" database="db$0-743" /> --> <dataNode name="dn1" dataHost="node1" database="testdb01" /> <dataNode name="dn2" dataHost="node1" database="testdb02" /> <dataNode name="dn3" dataHost="node1" database="testdb03" /> <dataNode name="dn13" dataHost="node2" database="testdb13" /> <dataNode name="dn14" dataHost="node2" database="testdb14" /> <dataNode name="dn15" dataHost="node2" database="testdb15" /> <dataNode name="dn25" dataHost="node3" database="testdb25" /> <dataNode name="dn26" dataHost="node3" database="testdb26" /> <dataNode name="dn27" dataHost="node3" database="testdb27" /> <!--<dataNode name="dn4" dataHost="sequoiadb1" database="SAMPLE" /> <dataNode name="jdbc_dn1" dataHost="jdbchost" database="db1" /> <dataNode name="jdbc_dn2" dataHost="jdbchost" database="db2" /> <dataNode name="jdbc_dn3" dataHost="jdbchost" database="db3" /> --> <dataHost name="node1" 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="192.168.8.31" url="192.168.8.31:3306" user="root" password="mysql"></writeHost> </dataHost> <dataHost name="node2" 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="192.168.8.32" url="192.168.8.32:3306" user="root" password="mysql"></writeHost> </dataHost> <dataHost name="node3" 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="192.168.8.33" url="192.168.8.33:3306" user="root" password="mysql"></writeHost> </dataHost> </mycat:schema>
三、配置rule.xml
<tableRule name="sharding-by-murmur-user04-id"> <rule> <columns>id</columns> <algorithm>murmur-id</algorithm> </rule> </tableRule> <function name="murmur-id" class="io.mycat.route.function.PartitionByMurmurHash"> <property name="seed">0</property><!-- 默认是 0 --> <property name="type">0</property><!-- 默认是 0, 表示 integer,非 0 表示 string--> <property name="count">9</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 --> </function>
四、配置server.xml
<user name="root" defaultAccount="true"> <property name="password">mysql</property> <property name="schemas">mycatdb</property> </user>
五、启动mycat
/usr/local/mycat/bin/mycat start
查看mycat日志
STATUS | wrapper | 2018/11/22 16:48:27 | --> Wrapper Started as Daemon STATUS | wrapper | 2018/11/22 16:48:27 | Launching a JVM... INFO | jvm 1 | 2018/11/22 16:48:27 | OpenJDK 64-Bit Server VM warning: ignoring option MaxPermSize=64M; support was removed in 8.0 INFO | jvm 1 | 2018/11/22 16:48:29 | Wrapper (Version 3.2.3) http://wrapper.tanukisoftware.org INFO | jvm 1 | 2018/11/22 16:48:29 | Copyright 1999-2006 Tanuki Software, Inc. All Rights Reserved. INFO | jvm 1 | 2018/11/22 16:48:29 | INFO | jvm 1 | 2018/11/22 16:48:34 | MyCAT Server startup successfully. see logs in logs/mycat.log
六、登录MySQL查看逻辑表
mysql -uroot -pmysql -P8066 -h292.168.8.30
mysql> show databases; +----------+ | DATABASE | +----------+ | mycatdb | +----------+ 1 row in set (0.00 sec) mysql> use mycatdb; Reading table information for completion of table and column names You can turn off this feature to get a quicker startup with -A Database changed mysql> show tables; +-------------------+ | Tables in mycatdb | +-------------------+ | order01 | | orderdetail01 | | user01 | | user02 | | user03 | | user04 | +-------------------+ 6 rows in set (0.01 sec) mysql> select * from user04; ERROR 1105 (HY000): Table 'testdb03.user04' doesn't exist mysql> drop table if exists user04; Query OK, 0 rows affected, 1 warning (0.15 sec) mysql> create table user04 ( -> id int not null auto_increment, -> name varchar(64), -> primary key (id) -> ); Query OK, 0 rows affected (0.61 sec)
七、插入测试数据
insert into user04(id,name) values(1,'steven'); insert into user04(id,name) values(2,'steven'); insert into user04(id,name) values(3,'steven'); insert into user04(id,name) values(4,'steven'); insert into user04(id,name) values(5,'steven'); insert into user04(id,name) values(6,'steven'); insert into user04(id,name) values(7,'steven'); insert into user04(id,name) values(8,'steven'); insert into user04(id,name) values(9,'steven'); insert into user04(id,name) values(10,'steven'); insert into user04(id,name) values(11,'steven'); insert into user04(id,name) values(12,'steven'); insert into user04(id,name) values(13,'steven'); insert into user04(id,name) values(14,'steven'); insert into user04(id,name) values(15,'steven'); insert into user04(id,name) values(16,'steven'); insert into user04(id,name) values(17,'steven'); insert into user04(id,name) values(18,'steven'); insert into user04(id,name) values(19,'steven'); insert into user04(id,name) values(20,'steven'); insert into user04(id,name) values(21,'steven'); insert into user04(id,name) values(22,'steven'); insert into user04(id,name) values(23,'steven'); insert into user04(id,name) values(24,'steven'); insert into user04(id,name) values(25,'steven'); insert into user04(id,name) values(26,'steven'); insert into user04(id,name) values(27,'steven'); insert into user04(id,name) values(28,'steven'); insert into user04(id,name) values(29,'steven'); insert into user04(id,name) values(30,'steven'); insert into user04(id,name) values(31,'steven'); insert into user04(id,name) values(32,'steven'); insert into user04(id,name) values(33,'steven'); insert into user04(id,name) values(34,'steven'); insert into user04(id,name) values(35,'steven'); insert into user04(id,name) values(36,'steven'); insert into user04(id,name) values(37,'steven'); insert into user04(id,name) values(38,'steven'); insert into user04(id,name) values(39,'steven'); insert into user04(id,name) values(40,'steven'); insert into user04(id,name) values(41,'steven'); insert into user04(id,name) values(42,'steven'); insert into user04(id,name) values(43,'steven'); insert into user04(id,name) values(44,'steven'); insert into user04(id,name) values(45,'steven'); insert into user04(id,name) values(46,'steven'); insert into user04(id,name) values(47,'steven'); insert into user04(id,name) values(48,'steven'); insert into user04(id,name) values(49,'steven'); insert into user04(id,name) values(50,'steven');
八、验证数据
三个node只在testdb01-03,testdb13-15，testdb25-27，所以除了这9个物理库之外，其他库查不到分片。
下面在三个node分别验证出分片信息：
node1
mysql> select * from testdb01.user04; +----+--------+ | id | name | +----+--------+ | 8 | steven | | 14 | steven | | 16 | steven | | 17 | steven | | 34 | steven | | 49 | steven | +----+--------+ 6 rows in set (0.00 sec) mysql> select * from testdb02.user04; +----+--------+ | id | name | +----+--------+ | 9 | steven | | 10 | steven | | 44 | steven | | 45 | steven | | 46 | steven | | 48 | steven | +----+--------+ 6 rows in set (0.00 sec) mysql> select * from testdb03.user04; +----+--------+ | id | name | +----+--------+ | 11 | steven | | 24 | steven | | 33 | steven | | 35 | steven | | 40 | steven | +----+--------+ 5 rows in set (0.00 sec)
node2
mysql> select * from testdb13.user04; +----+--------+ | id | name | +----+--------+ | 20 | steven | | 25 | steven | | 38 | steven | | 39 | steven | +----+--------+ 4 rows in set (0.00 sec) mysql> select * from testdb14.user04; +----+--------+ | id | name | +----+--------+ | 1 | steven | | 41 | steven | | 50 | steven | +----+--------+ 3 rows in set (0.01 sec) mysql> select * from testdb15.user04; +----+--------+ | id | name | +----+--------+ | 12 | steven | | 18 | steven | | 32 | steven | | 36 | steven | +----+--------+ 4 rows in set (0.00 sec)
node3
mysql> select * from testdb25.user04; +----+--------+ | id | name | +----+--------+ | 6 | steven | | 13 | steven | | 19 | steven | | 23 | steven | | 27 | steven | | 28 | steven | | 29 | steven | | 31 | steven | | 37 | steven | +----+--------+ 9 rows in set (0.00 sec) mysql> select * from testdb26.user04; +----+--------+ | id | name | +----+--------+ | 4 | steven | | 5 | steven | | 15 | steven | | 22 | steven | | 42 | steven | +----+--------+ 5 rows in set (0.00 sec) mysql> select * from testdb27.user04; +----+--------+ | id | name | +----+--------+ | 2 | steven | | 3 | steven | | 7 | steven | | 21 | steven | | 26 | steven | | 30 | steven | | 43 | steven | | 47 | steven | +----+--------+ 8 rows in set (0.00 sec)
“MyCat怎么实现分库分表”的内容就介绍到这里了，感谢大家的阅读。如果想了解更多行业相关的知识可以关注亿速云网站，小编将为大家输出更多高质量的实用文章！
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