mycat分表扩展之分片枚举
1.修改schema.xml配置文件
<?xml version="1.0"?>
<!DOCTYPE mycat:schema SYSTEM "schema.dtd">
<mycat:schema xmlns:mycat="http://io.mycat/">
<schema name="orders1" checkSQLschema="true" sqlMaxLimit="100" dataNode="dn1">
<table name="customer" dataNode="dn2" ></table>
<table name="orders" dataNode="dn1,dn2" rule="mod_rule" autoIncrement="true" fetchStoreNodeByJdbc="true">
<!--orders_detail与orders表根据order_id关联-->
<childTable name="orders_detail" primaryKey="id" joinKey="order_id" parentKey="id" />
</table>
<!--定义全局表-->
<table name="dict_order_type" dataNode="dn1,dn2" type="global" ></table>
<!--分片枚举-->
<table name="orders_ware_info" dataNode="dn1,dn2" rule="sharding_by_intfile" ></table>
</schema>
<dataNode name="dn1" dataHost="host1" database="orders1" />
<dataNode name="dn2" dataHost="host2" database="orders1" />
<dataHost name="host1" maxCon="1000" minCon="10" balance="0"
writeType="0" dbType="mysql" dbDriver="jdbc" switchType="1" slaveThreshold="100">
<heartbeat>select user()</heartbeat>
<writeHost host="hostM1" url="jdbc:mysql://192.168.2.130:3306" user="root"
password="kht123">
</writeHost>
</dataHost>
<dataHost name="host2" maxCon="1000" minCon="10" balance="0"
writeType="0" dbType="mysql" dbDriver="jdbc" switchType="1" slaveThreshold="100">
<heartbeat>select user()</heartbeat>
<writeHost host="hostM2" url="jdbc:mysql://192.168.2.131:3306" user="root"
password="kht123">
</writeHost>
</dataHost>
</mycat:schema>
2.修改rule.xml配置文件
<tableRule name="mod_rule">
<rule>
<columns>customer_id</columns>
<algorithm>mod-long</algorithm>
</rule>
</tableRule>
<!--
# columns:分片字段,algorithm:分片函数
# mapFile:标识配置文件名称,type:0为int型、非0为String,
#defaultNode:默认节点:小于 0 表示不设置默认节点,大于等于 0 表示设置默认节点,
#设置默认节点如果碰到不识别的枚举值,就让它路由到默认节点,如不设置不识别就报错
-->
<function name="hash-int"
class="io.mycat.route.function.PartitionByFileMap">
<property name="mapFile">partition-hash-int.txt</property>
<property name="type">1</property>
<property name="defaultNode">0</property>
</function>
3.修改partition-hash-int.txt配置文件
110=0
120=1
#订单归属区域信息表
CREATE TABLE orders_ware_info
(
`id` INT AUTO_INCREMENT comment '编号',
`order_id` INT comment '订单编号',
`address` VARCHAR(200) comment '地址',
`areacode` VARCHAR(20) comment '区域编号',
PRIMARY KEY(id)
);
INSERT INTO orders_ware_info(id, order_id,address,areacode) VALUES (1,1,'北京','110');
INSERT INTO orders_ware_info(id, order_id,address,areacode) VALUES (2,2,'天津','120');
4.查询Mycat、dn1、dn2可以看到数据分片效果