mycat分库规则crc32slot

crs32算法,分库字段类型支撑int和varchar.

1.rule.xml

<tableRule name="crc32slot">
         <rule>
                 <columns>id</columns>
                 <algorithm>crc32slot</algorithm>
         </rule>
 </tableRule>
 <function name="crc32slot"
                   class="io.mycat.route.function.PartitionByCRC32PreSlot">
         <property name="count">6</property><!-- 要分片的数据库节点数量，必须指定，否则没法分片 -->
 </function>

count=6指定需要分库的个数.

2.schema.xml

<?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" />
          <table name="tb_user_detail_t" dataNode="dn1,dn2,dn3,dn4,dn5,dn6" rule="auto-sharding-long-userid" />
          <table name="tb_user_murmur_t" dataNode="dn1,dn2,dn3,dn4,dn5,dn6" rule="sharding-by-murmur" />
          <table name="tb_user_murmur_string_t" dataNode="dn1,dn2,dn3,dn4,dn5,dn6" rule="sharding-by-murmur-userid" />
          <table name="tb_user_crc32slot_t" dataNode="dn1,dn2,dn3,dn4,dn5,dn6" rule="crc32slot" />
        </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.创建表
CREATE TABLE `tb_user_crc32slot_t` (
  `id` varchar(32) NOT NULL,
  `name` varchar(64) DEFAULT NULL,
  `createtime` datetime DEFAULT CURRENT_TIMESTAMP,
  `moditytime` datetime DEFAULT CURRENT_TIMESTAMP
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

写入数据:
insert into tb_user_crc32slot_t(id,name) values('a0002','name1');
insert into tb_user_crc32slot_t(id,name) values('a0003','name1');
insert into tb_user_crc32slot_t(id,name) values('a0004','name1');
insert into tb_user_crc32slot_t(id,name) values('a0005','name1');
insert into tb_user_crc32slot_t(id,name) values('a0006','name1');
insert into tb_user_crc32slot_t(id,name) values('a0007','name1');
insert into tb_user_crc32slot_t(id,name) values('a0008','name1');
insert into tb_user_crc32slot_t(id,name) values('a0009','name1');
insert into tb_user_crc32slot_t(id,name) values('a0010','name1');
insert into tb_user_crc32slot_t(id,name) values('a0011','name1');
insert into tb_user_crc32slot_t(id,name) values('a0012','name1');
insert into tb_user_crc32slot_t(id,name) values('a0013','name1');
insert into tb_user_crc32slot_t(id,name) values('a0014','name1');
insert into tb_user_crc32slot_t(id,name) values('a0015','name1');

-- The End --