mysql05

对Select操作，mycat会随机现在一个节点输出结果内容；
对Insert-Update-Delete操作，Mycat会操作所有节点

mycat er 表

mycat节点 192.168.239.140

修改schema.xml

 1 <dataHost name="localhost1" maxCon="1000" minCon="10" balance="0"
 2                           writeType="0" dbType="mysql" dbDriver="native" switchType="1"  slaveThreshold="100">
 3                 <heartbeat>select user()</heartbeat>
 4 
 5                 <writeHost host="hostM1" url="localhost:3306" user="scos"
 6                                    password="scos">
 7 
 8                 <readHost host="hostS2" url="localhost:3306" user="scos" password="scos" />
 9                 </writeHost>
10 
11         </dataHost>

./mycat console

customer表与子表orders和order_items的关系如下

 1 <table name="customer" primaryKey="ID" dataNode="dn1,dn2"
 2                            rule="sharding-by-intfile">
 3                         <childTable name="orders" primaryKey="ID" joinKey="customer_id"
 4                                                 parentKey="id">
 5                                 <childTable name="order_items" joinKey="order_id"
 6                                                         parentKey="id" />
 7                         </childTable>
 8                         <childTable name="customer_addr" primaryKey="ID" joinKey="customer_id"
 9                                                 parentKey="id" />
10                 </table>

查看rule.xml

1         <tableRule name="sharding-by-intfile">
2                 <rule>
3                         <columns>sharding_id</columns>
4                         <algorithm>hash-int</algorithm>
5                 </rule>
6         </tableRule>

mysql -u root -p -h192.168.239.140 -P8066

 1 创建表
 2 create table customer (id int PRIMARY KEY,name VARCHAR(10),sharding_id INT);
 3 create table orders (id int PRIMARY KEY,name VARCHAR(10),customer_id INT);
 4 create table order_items (id int PRIMARY KEY,order_id int );
 5 
 6 
 7 INSERT into customer (id,name,sharding_id) values (1,‘xiaoming‘,10000);
 8 explain   INSERT into customer (id,name,sharding_id) values (1,‘xiaoming‘,10000);
 9 
10 data_node dn1
11 
12 insert into orders (id,name,customer_id) VALUES (1,‘goods‘,1);
13 
14 INSERT into order_items (id,order_id) VALUES(1,1);

mysql -uroot -proot 登陆

1 use db1
2 show tables;
3 
4 customer employee orders

验证

1 INSERT into customer (id,name,sharding_id) values (2,‘xiaoming‘,10000);
2 
3 explain   INSERT into customer (id,name,sharding_id) values (2,‘xiaoming‘,10000);
4 
5 data_node dn2

另一种方式，客户端组件分片

sharding JDBC

完

mysql05

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