1:下载mycat

下载地址：http://dl.mycat.org.cn/

下载后将文件解压

2:提前创建数据库跟表

3:修改主要配置文件

server.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mycat:server SYSTEM "server.dtd">
<mycat:server xmlns:mycat="http://io.mycat/">
    <system>
    <property name="nonePasswordLogin">0</property> <!-- 0为需要密码登陆、1为不需要密码登陆 ,默认为0，设置为1则需要指定默认账户-->
    <property name="ignoreUnknownCommand">0</property><!-- 0遇上没有实现的报文(Unknown command:),就会报错、1为忽略该报文，返回ok报文。
    在某些mysql客户端存在客户端已经登录的时候还会继续发送登录报文,mycat会报错,该设置可以绕过这个错误-->
    <property name="useHandshakeV10">1</property>
    <property name="removeGraveAccent">1</property>
    <property name="useSqlStat">0</property>  <!-- 1为开启实时统计、0为关闭 -->
    <property name="useGlobleTableCheck">0</property>  <!-- 1为开启全加班一致性检测、0为关闭 -->
    <property name="sqlExecuteTimeout">300</property>  <!-- SQL 执行超时 单位:秒-->
    <property name="sequnceHandlerType">1</property>
        
    <property name="sequnceHandlerPattern">(?:(\s*next\s+value\s+for\s*MYCATSEQ_(\w+))(,|\)|\s)*)+</property>
    <property name="subqueryRelationshipCheck">false</property> <!-- 子查询中存在关联查询的情况下,检查关联字段中是否有分片字段 .默认 false -->
    <property name="sequenceHanlderClass">io.mycat.route.sequence.handler.HttpIncrSequenceHandler</property>
   
        <!--默认为type 0: DirectByteBufferPool | type 1 ByteBufferArena | type 2 NettyBufferPool -->
    <property name="processorBufferPoolType">0</property>
        
        <!--分布式事务开关，0为不过滤分布式事务，1为过滤分布式事务（如果分布式事务内只涉及全局表，则不过滤），2为不过滤分布式事务,但是记录分布式事务日志-->
    <property name="handleDistributedTransactions">0</property>
        
    <!--
        off heap for merge/order/group/limit      1开启   0关闭
    -->
    <property name="useOffHeapForMerge">0</property>

    <!--
        单位为m
    -->
        <property name="memoryPageSize">64k</property>

    <!--
        单位为k
    -->
      <property name="spillsFileBufferSize">1k</property>

    <property name="useStreamOutput">0</property>

    <!--
    单位为m
    -->
<property name="systemReserveMemorySize">384m</property>


    <!--是否采用zookeeper协调切换  -->
    <property name="useZKSwitch">false</property>

    <property name="strictTxIsolation">false</property>
        
    <property name="useZKSwitch">true</property>
    <!--如果为0的话,涉及多个DataNode的catlet任务不会跨线程执行-->
    <property name="parallExecute">0</property>
    </system>

    <user name="root" defaultAccount="true">
        <property name="password">123456</property>
        <property name="schemas">radar</property>
        <property name="defaultSchema">radar</property>
        <!--No MyCAT Database selected 错误前会尝试使用该schema作为schema，不设置则为null,报错 -->
        
        <!-- 表级 DML 权限设置 -->
        <!--        
        <privileges check="false">
            <schema name="TESTDB" dml="0110" >
                <table name="tb01" dml="0000"></table>
                <table name="tb02" dml="1111"></table>
            </schema>
        </privileges>       
         -->
    </user>

    <user name="user">
        <property name="password">123456</property>
        <property name="schemas">radar</property>
        <property name="readOnly">true</property>
        <property name="defaultSchema">radar</property>
    </user>

</mycat:server>

schema.xml

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

    <schema name="radar" checkSQLschema="true" sqlMaxLimit="100" >
        <!-- auto sharding by id (long) -->
        <table name="t_respire" dataNode="dn1,dn2,dn3" rule="mod-long" splitTableNames ="true"/>
         <table name="student" dataNode="dn1,dn2,dn3" rule="mod-long" splitTableNames ="true"/>
    </schema>
    <!-- <dataNode name="dn1$0-743" dataHost="localhost1" database="db$0-743"
        /> -->
    <dataNode name="dn1" dataHost="localhost1" database="radar-01" />
    <dataNode name="dn2" dataHost="localhost1" database="radar-02" />
    <dataNode name="dn3" dataHost="localhost1" database="radar-03" />
    <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="localhost:3306" user="root"
                   password="123456">
        </writeHost>
        <!-- <writeHost host="hostM2" url="localhost:3316" user="root" password="123456"/> -->
    </dataHost>
</mycat:schema>