mycat分库规则sharding-by-intfile(枚举)

1.定义规则rule.xml

<tableRule name="sharding-by-intfile-provcode">
        <rule>
                <columns>provcode</columns>
                <algorithm>hash-int-provcode</algorithm>
        </rule>
</tableRule>

<function name="hash-int-provcode"
        class="io.mycat.route.function.PartitionByFileMap">
        <property name="mapFile">partition-hash-int-provcode.txt</property>
        <property name="type">0</property>
</function>

type=0 代表整形
type=1 代表字符串类型

[root@host01 conf]# more partition-hash-int-provcode.txt
1=0
2=1
3=2
4=3
5=4
6=5
7=0
8=1
9=2
10=3
11=4
12=5
DEFAULT_NODE=0 ##找不到省份匹配的情况下,默认放到数据库1
我这里是6个库,序号0-5,将不同的省份映射到对应的库。

2.schema.xml配置文件

<?xml version="1.0"?>
<!DOCTYPE mycat:schema SYSTEM "schema.dtd">
<mycat:schema xmlns:mycat="">

        <schema name="logdb" checkSQLschema="false" sqlMaxLimit="100">
          <table name="tb_log_t" primaryKey="ID" autoIncrement="true" dataNode="dn1,dn2,dn3,dn4,dn5,dn6" rule="mod-long" />
          <table name="tb_user_t" dataNode="dn1,dn2,dn3,dn4,dn5,dn6" rule="sharding-by-intfile-provcode" />
        </schema>
        <schema name="coss03" checkSQLschema="false" sqlMaxLimit="100" dataNode="dnoss03"/>
        <dataNode name="dn1" dataHost="localhost1" database="log01" />
        <dataNode name="dn2" dataHost="localhost1" database="log02" />
        <dataNode name="dn3" dataHost="localhost1" database="log03" />
        <dataNode name="dn4" dataHost="localhost1" database="log04" />
        <dataNode name="dn5" dataHost="localhost1" database="log05" />
        <dataNode name="dn6" dataHost="localhost1" database="log06" />
        <dataNode name="dnoss03" dataHost="localhost1" database="oss03" />
        <dataHost name="localhost1" maxCon="1000" minCon="10" balance="0"
                          writeType="0" dbType="mysql" dbDriver="native" switchType="1" slaveThreshold="100">
                <heartbeat>select user()</heartbeat>
                <!-- can have multi write hosts -->
                <writeHost host="hostM1" url="192.168.56.141:3306" user="root"
                                   password="mysql">
                        <!-- can have multi read hosts -->
                        <readHost host="hostS2" url="192.168.56.142:3306" user="root" password="mysql" />
                </writeHost>
        </dataHost>
</mycat:schema>

3.建表语句
CREATE TABLE `tb_user_t` (
  id bigint auto_increment not null primary key,
  `name` varchar(64) DEFAULT NULL,
   provcode int ,
  `createtime` datetime DEFAULT CURRENT_TIMESTAMP,
  `moditytime` datetime DEFAULT CURRENT_TIMESTAMP
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
发现分库情况下定义自动增长的id不管用，因为每个库都有自己的自增长id,通过mycat查询的话会有重复的id.
如下:
mysql> select * from tb_user_t order by id;
+----+----------+----------+---------------------+---------------------+
| id | name     | provcode | createtime          | moditytime          |
+----+----------+----------+---------------------+---------------------+
|  1 | name0005 |        5 | 2017-08-09 10:54:44 | 2017-08-09 10:54:44 |
|  1 | name0001 |        1 | 2017-08-09 10:54:44 | 2017-08-09 10:54:44 |
|  1 | name0004 |        4 | 2017-08-09 10:54:44 | 2017-08-09 10:54:44 |
|  1 | name0002 |        2 | 2017-08-09 10:54:44 | 2017-08-09 10:54:44 |
|  1 | name0003 |        3 | 2017-08-09 10:54:44 | 2017-08-09 10:54:44 |
|  1 | name0006 |        6 | 2017-08-09 10:54:44 | 2017-08-09 10:54:44 |
|  2 | name0011 |       11 | 2017-08-09 10:54:53 | 2017-08-09 10:54:53 |
|  2 | name0007 |        7 | 2017-08-09 10:54:53 | 2017-08-09 10:54:53 |
|  2 | name0010 |       10 | 2017-08-09 10:54:53 | 2017-08-09 10:54:53 |
|  2 | name0008 |        8 | 2017-08-09 10:54:53 | 2017-08-09 10:54:53 |
|  2 | name0009 |        9 | 2017-08-09 10:54:53 | 2017-08-09 10:54:53 |
|  2 | name0012 |       12 | 2017-08-09 10:54:53 | 2017-08-09 10:54:53 |
|  3 | name0013 |       13 | 2017-08-09 11:12:17 | 2017-08-09 11:12:17 |
+----+----------+----------+---------------------+---------------------+
13 rows in set (0.02 sec)

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