mycat 1.6 简单的操作实例

环境：
centos7.4 + mysql5.7.20 + mycat1.6
单台主机上安装了5台mysql_5.7.20 实例（3306，3307，3308，3309，3310）
3306为独立实例 (db6,order_db,sequence_test)
3307为独立实例 (db7,order_db)

3308为主DB (db8,user_db) --GTID复制
3309为从DB(主3308)
3301为从DB(主3308)

一、环境创建

#创建mycat账号
mysql -uroot -p123456 -h127.0.0.1 -P 3306 -e"create user mycat6@'%' identified by ''; grant all privileges on *.* to mycat6@'%'; "
mysql -uroot -p123456 -h127.0.0.1 -P 3307 -e"create user mycat7@'%' identified by ''; grant all privileges on *.* to mycat7@'%'; "
mysql -uroot -p123456 -h127.0.0.1 -P 3308 -e"create user mycat8@'%' identified by ''; grant all privileges on *.* to mycat8@'%'; "

#创建数据库及表
mysql -uroot -p123456 -h127.0.0.1 -P 3306 -e"create database db6;"
mysql -uroot -p123456 -h127.0.0.1 -P 3307 -e"create database db7;"
mysql -uroot -p123456 -h127.0.0.1 -P 3308 -e"create database db8;"

mysql -uroot -p123456 -h127.0.0.1 -P 3308 -e"create database user_db;" ##配读写分离
mysql -uroot -p123456 -h127.0.0.1 -P 3308 -e"create table user_db.users(id int auto_increment primary key ,user_id int ,user_name varchar(12));" ##配读写分离

mysql -uroot -p123456 -h127.0.0.1 -P 3306 -e"create database order_db;" ##配分片
mysql -uroot -p123456 -h127.0.0.1 -P 3307 -e"create database order_db;" ##配分片
mysql -uroot -p123456 -h127.0.0.1 -P 3306 -e"create table order_db.orders(id int auto_increment primary key ,user_id int ,order_id varchar(12));" ##配分片
mysql -uroot -p123456 -h127.0.0.1 -P 3307 -e"create table order_db.orders(id int auto_increment primary key ,user_id int ,order_id varchar(12));" ##配分片

mysql -uroot -p123456 -h127.0.0.1 -P 3306 -e"create table db6.city(id int auto_increment primary key ,city_name varchar(16));" ##配全局表
mysql -uroot -p123456 -h127.0.0.1 -P 3307 -e"create table db7.city(id int auto_increment primary key ,city_name varchar(16));" ##配全局表
mysql -uroot -p123456 -h127.0.0.1 -P 3308 -e"create table db8.city(id int auto_increment primary key ,city_name varchar(16));" ##配全局表

mysql -uroot -p123456 -h127.0.0.1 -P 3306 -e"create database sequence_test;" ##全局序列库
mysql -uroot -p123456 -h127.0.0.1 -P 3306 -e"create table sequence_test.MYCAT_SEQUENCE(name VARCHAR (50) NOT NULL PRIMARY KEY , current_value INT NOT NULL ,increment INT NOT NULL DEFAULT 100 ); " ##全局序列号表
mysql -uroot -p123456 -h127.0.0.1 -P 3306
use sequence_test ;
#取当前squence的值
mysql>
DROP FUNCTION IF EXISTS mycat_seq_currval;
DELIMITER $
CREATE FUNCTION mycat_seq_currval(seq_name VARCHAR(50)) RETURNS varchar(64) CHARSET utf8
DETERMINISTIC
BEGIN
DECLARE retval VARCHAR(64);
SET retval="-999999999,null";
SELECT concat(CAST(current_value AS CHAR),",",CAST(increment AS CHAR)) INTO retval FROM MYCAT_SEQUENCE WHERE name = seq_name;
RETURN retval;
END $
DELIMITER ;
#设置 sequence 值
mysql>
DROP FUNCTION IF EXISTS mycat_seq_setval;
DELIMITER $
CREATE FUNCTION mycat_seq_setval(seq_name VARCHAR(50),value INTEGER) RETURNS varchar(64) CHARSET utf8
DETERMINISTIC
BEGIN
UPDATE MYCAT_SEQUENCE
SET current_value = value
WHERE name = seq_name;
RETURN mycat_seq_currval(seq_name);
END $
DELIMITER ;
#取下一个sequence的值
mysql>
DROP FUNCTION IF EXISTS mycat_seq_nextval;
DELIMITER $
CREATE FUNCTION mycat_seq_nextval(seq_name VARCHAR(50)) RETURNS varchar(64) CHARSET utf8
DETERMINISTIC
BEGIN
UPDATE MYCAT_SEQUENCE
SET current_value = current_value + increment WHERE name = seq_name;
RETURN mycat_seq_currval(seq_name);
END $
DELIMITER ;

mysql -uroot -p123456 -h127.0.0.1 -P 3306 -e"use sequence_test;INSERT INTO MYCAT_SEQUENCE(name,current_value,increment) VALUES ('seq_test', 1, 100); "

#全局序列号名称引用关系
#INSERT INTO MYCAT_SEQUENCE(name,current_value,increment) VALUES (【'seq_test'】, 1, 100); "
#【SEQ_TEST]】=dn_seq
#next value for MYCATSEQ_【SEQ_TEST】

二、文件配置

sequence_db_conf.properties 全局序列号文件配置
SEQ_TEST=dn_seq

server.xml 文件配置（修改内容）
<system>
<property name="sequnceHandlerType">1</property> ##全局序列号
</system>

<user name="mycat">
<property name="password">123456</property>
<property name="schemas">s_global_db,s_db6,s_db7,s_db8,s_user_db,s_order_db</property> ##mysql> show databases;看到的内容
</user>

schema.xml 文件配置
<?xml version="1.0"?>
<!DOCTYPE mycat:schema SYSTEM "schema.dtd">
<mycat:schema xmlns:mycat="http://io.mycat/">

<schema name="s_db6" checkSQLschema="false" sqlMaxLimit="100" dataNode="dn6" >    </schema>
<schema name="s_db7" checkSQLschema="false" sqlMaxLimit="100" dataNode="dn7" >    </schema>
<schema name="s_db8" checkSQLschema="false" sqlMaxLimit="100" dataNode="dn8" >    </schema>
<schema name="s_user_db" checkSQLschema="false" sqlMaxLimit="100" dataNode="dn82" >    </schema>
<schema name="s_order_db" checkSQLschema="false" sqlMaxLimit="100">
<table name="orders" primaryKey="id" autoIncrement="true" dataNode="dn62,dn72" rule="mod-long" /> ##分片表
</schema>
<schema name="s_global_db" checkSQLschema="false" sqlMaxLimit="100">
<table name="city" primaryKey="id" autoIncrement="true" type="global" dataNode="dn6,dn7,dn8" /> ##全局表
</schema>

<dataNode name="dn6" dataHost="dh6" database="db6" />
<dataNode name="dn7" dataHost="dh7" database="db7" />
<dataNode name="dn8" dataHost="dh8" database="db8" />
<dataNode name="dn82" dataHost="dh8" database="user_db" />
<dataNode name="dn62" dataHost="dh6" database="order_db" /> ##分片表
<dataNode name="dn72" dataHost="dh7" database="order_db" /> ##分片表
<dataNode name="dn_seq" dataHost="dh6" database="sequence_test" />    ##全局序列号节点

<dataHost name="dh6" maxCon="1000" minCon="10" balance="0" writeType="0" dbType="mysql" dbDriver="native" switchType="1" slaveThreshold="100">
<heartbeat>select user()</heartbeat>
<writeHost host="host6_M" url="127.0.0.1:3306" user="mycat6" password="123456"> </writeHost>
</dataHost>

<dataHost name="dh7" maxCon="1000" minCon="10" balance="0" writeType="0" dbType="mysql" dbDriver="native" switchType="1" slaveThreshold="100">
<heartbeat>select user()</heartbeat>
<writeHost host="host7_M" url="127.0.0.1:3307" user="mycat7" password="123456"> </writeHost>
</dataHost>

<dataHost name="dh8" maxCon="1000" minCon="10" balance="1" writeType="0" dbType="mysql" dbDriver="native" switchType="1" slaveThreshold="100">
<heartbeat>select user()</heartbeat>
<writeHost host="host8_M" url="127.0.0.1:3308" user="mycat8" password="123456"> ##读写分离
<readHost host="host8_S1" url="127.0.0.1:3309" user="mycat8" password="123456" />
<readHost host="host8_s2" url="127.0.0.1:3310" user="mycat8" password="123456" />
</writeHost>
</dataHost>

</mycat:schema>

rule.xml文件配置（修改内容）
<tableRule name="mod-long"> ##分片表(规则)
<rule>
<columns>user_id</columns>
<algorithm>mod-long</algorithm>
</rule>
</tableRule>

<function name="mod-long" class="io.mycat.route.function.PartitionByMod"> ##分片表(函数)
<!-- how many data nodes -->
<property name="count">2</property> ##分片节点数量
</function>

三、测试结果

测试分表及全局序列号结果：

mysql -umycat -p123456 -h127.0.0.1 -P 8066 -e "show databases;"
mysql -umycat -p123456 -h127.0.0.1 -P 8066 -e "use s_order_db ; "
mysql -umycat -p123456 -h127.0.0.1 -P 8066 -e "use s_order_db ; select * from orders; insert into orders(id,user_id,order_id) values (next value for MYCATSEQ_SEQ_TEST,1,'A01'); insert into orders(id,user_id,order_id) values (next value for MYCATSEQ_SEQ_TEST,2,'A02'); insert into orders(id,user_id,order_id) values (next value for MYCATSEQ_SEQ_TEST,3,'A03'); insert into orders(id,user_id,order_id) values (next value for MYCATSEQ_SEQ_TEST,4,'A04'); insert into orders(id,user_id,order_id) values (next value for MYCATSEQ_SEQ_TEST,5,'A05'); insert into orders(id,user_id,order_id) values (next value for MYCATSEQ_SEQ_TEST,7,'A07');"
mysql -uroot -p123456 -h127.0.0.1 -P 8066 -e "use s_order_db ; select * from orders; "
mysql -uroot -p123456 -h127.0.0.1 -P 3306 -e "use order_db ; select * from orders; "
mysql -uroot -p123456 -h127.0.0.1 -P 3307 -e "use order_db ; select * from orders; "

测试全局表结果：
mysql -umycat -p123456 -h127.0.0.1 -P 8066 -e "use s_global_db ; insert into city(id,city_name) values (null,'武汉'); insert into city(id,city_name) values (null,'深圳');"
mysql -umycat -p123456 -h127.0.0.1 -P 8066 -e "use s_global_db ; select * from city; "
mysql -uroot -p123456 -h127.0.0.1 -P 3306 -e "use db6 ; select * from city; "
mysql -uroot -p123456 -h127.0.0.1 -P 3307 -e "use db7 ; select * from city; "
mysql -uroot -p123456 -h127.0.0.1 -P 3308 -e "use db8 ; select * from city; "