mycat-2:schema.xml 配置文件

[root@minion conf]# more schema.xml `
<?xml version="1.0"?>
<!DOCTYPE mycat:schema SYSTEM "schema.dtd">
<mycat:schema xmlns:mycat="http://io.mycat/">
        <!-- 定义一个MyCat的模式，逻辑数据库名称TESTDB -->
        <!-- “checkSQLschema”：描述的是当前的链接是否须要检测数据库的模式 -->
        <!-- “sqlMaxLimit”：表示返回的最大的数据量的行数 -->
        <!-- “dataNode="dn1"”：该操做使用的数据节点是dn1的逻辑名称 -->

    <schema name="TESTDB" checkSQLschema="false" sqlMaxLimit="100">
        <!-- auto sharding by id (long) -->
        <table name="travelrecord" dataNode="dn1,dn2,dn3" rule="auto-sharding-long" />

        <!-- global table is auto cloned to all defined data nodes ,so can join
            with any table whose sharding node is in the same data node -->
        <table name="company" primaryKey="ID" type="global" dataNode="dn1,dn2,dn3" />
        <table name="goods" primaryKey="ID" type="global" dataNode="dn1,dn2" />
        <!-- random sharding using mod sharind rule -->
        <table name="hotnews" primaryKey="ID" autoIncrement="true" dataNode="dn1,dn2,dn3"
               rule="mod-long" />
        <!-- <table name="dual" primaryKey="ID" dataNode="dnx,dnoracle2" type="global"
            needAddLimit="false"/> <table name="worker" primaryKey="ID" dataNode="jdbc_dn1,jdbc_dn2,jdbc_dn3"
            rule="mod-long" /> -->
        <table name="employee" primaryKey="ID" dataNode="dn1,dn2"
               rule="sharding-by-intfile" />
        <table name="customer" primaryKey="ID" dataNode="dn1,dn2"
               rule="sharding-by-intfile">
            <childTable name="orders" primaryKey="ID" joinKey="customer_id"
                        parentKey="id">
                <childTable name="order_items" joinKey="order_id"
                            parentKey="id" />
            </childTable>
            <childTable name="customer_addr" primaryKey="ID" joinKey="customer_id"
                        parentKey="id" />
        </table>
        <!-- <table name="oc_call" primaryKey="ID" dataNode="dn1$0-743" rule="latest-month-calldate"
            /> -->
    </schema>
    <!-- <dataNode name="dn1$0-743" dataHost="localhost1" database="db$0-743"
        /> -->
        <!-- 定义数据的操做节点 -->
        <!-- “dataHost="localhost1"”：定义数据节点的逻辑名称 -->
        <!-- “database="db1"”：定义数据节点要使用的数据库名称 -->
    <dataNode name="dn1" dataHost="localhost1" database="db1" />
    <dataNode name="dn2" dataHost="localhost1" database="db2" />
    <dataNode name="dn3" dataHost="localhost1" database="db3" />
    <!--<dataNode name="dn4" dataHost="sequoiadb1" database="SAMPLE" />
     <dataNode name="jdbc_dn1" dataHost="jdbchost" database="db1" />
    <dataNode   name="jdbc_dn2" dataHost="jdbchost" database="db2" />
    <dataNode name="jdbc_dn3"   dataHost="jdbchost" database="db3" /> -->
    balance="0"
    0：不开启读写分离机制，全部读操做都发送到当前可用的writeHost上
    1：所有的readHost与stand by writeHost参与select语句的负载均衡，
    2：全部读操做都随机在writeHost、readHost上分发
    3：全部读请求随机分发到writeHost对应的readHost执行，writeHost不负担读压力

    writeType="0"
    0：全部写操做发送到配置的第一个writeHost，当第一个writeHost宕机时，切换到第二个writeHost，从新启动后以切换后的为准，切换记录在配置文件：dnindex.properties中
    1：全部写操做都随发送到配置的writeHost

    switchType:切换方式
   -1：不自动切换
    1：自动切换（默认）
    2：基于MySql主从同步的状态来决定是否切换

    <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">
            <!-- can have multi read hosts -->
            <readHost host="hostS2" url="192.168.1.200:3306" user="root" password="xxx" />
        </writeHost>
        <writeHost host="hostS1" url="localhost:3316" user="root"
                   password="123456" />
        <!-- <writeHost host="hostM2" url="localhost:3316" user="root" password="123456"/> -->
    </dataHost>

</mycat:schema