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
计算
安全
数据库
网络和加速
企业服务
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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原文链接：http://blog.itpub.net/30135314/viewspace-2221221/
