mycat1.6.5分片(按小时)

mycat one群：106088787。

说明：根据字段按照一天内的小时分片。

注释：字段为字符串类型，yyyymmddHH 10位。

一、conf/schema.xml文件

<?xml version="1.0"?>
<!DOCTYPE mycat:schema SYSTEM "schema.dtd">
<mycat:schema xmlns:mycat="http://io.mycat/">
	<schema name="TESTDB" checkSQLschema="false" sqlMaxLimit="100">
		<table name="sharding_by_hour" primaryKey="id" dataNode="dn$0-2"
			   rule="sharding-by-hour" />   
	</schema>
	<dataNode name="dn0" dataHost="dh-1" database="db0"/>
	<dataNode name="dn1" dataHost="dh-1" database="db1"/>
	<dataNode name="dn2" dataHost="dh-1" database="db2"/>
	<dataHost name="dh-1" maxCon="1000" minCon="10" balance="0"
			  writeType="0" dbType="mysql" dbDriver="native" switchType="1"  slaveThreshold="100">
		<heartbeat>select user()</heartbeat>
		<writeHost host="hostM1" url="localhost:3306" user="root"
				   password="123456">
		</writeHost>
	</dataHost>
</mycat:schema>

二、 conf/rule.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mycat:rule SYSTEM "rule.dtd">
<mycat:rule xmlns:mycat="http://io.mycat/">
	<tableRule name="sharding-by-hour">
		<rule>
			<columns>sharding_col</columns>
			<algorithm>sharding-by-hour</algorithm>
		</rule>
	</tableRule>
	<function name="sharding-by-hour"
		class="io.mycat.route.function.LatestMonthPartion">
		<property name="splitOneDay">3</property>
	</function>
</mycat:rule>

三、规则文件信息

无

四、测试用到的sql

=============按照create_time字段 按 小时分================
CREATE TABLE  sharding_by_hour  (create_time   timestamp NULL ON UPDATE CURRENT_TIMESTAMP  ,`db_nm`  varchar(20) NULL,sharding_col varchar(10) null);
INSERT INTO sharding_by_hour (sharding_col,create_time,db_nm) VALUES ('2017100101','2017-10-01', database());
INSERT INTO sharding_by_hour (sharding_col,create_time,db_nm) VALUES ('2017100108','2017-10-01', database());
INSERT INTO sharding_by_hour (sharding_col,create_time,db_nm) VALUES ('2017100109','2017-10-01', database());
INSERT INTO sharding_by_hour (sharding_col,create_time,db_nm) VALUES ('2017100116','2017-10-01', database());
INSERT INTO sharding_by_hour (sharding_col,create_time,db_nm) VALUES ('2017100117','2017-10-01', database());
INSERT INTO sharding_by_hour (sharding_col,create_time,db_nm) VALUES ('2017100123','2017-10-01', database());
select * from sharding_by_hour;

五、注意事项

1、分片数必须跟dataNode节点数一致

2、最大分24个分片

3、分片字段的值必须是字符串，如：2017102112.(即为2017年10月21日12点)

六、参数说明

columns：拆分字段，字符串类型（yyyymmddHH）

splitOneDay ：一天切分的分片数

mycat1.6.5分片(按小时)

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