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/">
        <!-- 定義一個MyCat的模式，邏輯數據庫名稱TESTDB -->
        <!-- 「checkSQLschema」：描述的是當前的鏈接是否須要檢測數據庫的模式 -->
        <!-- 「sqlMaxLimit」：表示返回的最大的數據量的行數 -->
        <!-- 「dataNode="dn1"」：該操做使用的數據節點是dn1的邏輯名稱 -->

    <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"
        /> -->
        <!-- 定義數據的操做節點 -->
        <!-- 「dataHost="localhost1"」：定義數據節點的邏輯名稱 -->
        <!-- 「database="db1"」：定義數據節點要使用的數據庫名稱 -->
    <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：不開啓讀寫分離機制，全部讀操做都發送到當前可用的writeHost上
    1：所有的readHost與stand by writeHost參與select語句的負載均衡，
    2：全部讀操做都隨機在writeHost、readHost上分發
    3：全部讀請求隨機分發到writeHost對應的readHost執行，writeHost不負擔讀壓力

    writeType="0"
    0：全部寫操做發送到配置的第一個writeHost，當第一個writeHost宕機時，切換到第二個writeHost，從新啓動後以切換後的爲準，切換記錄在配置文件：dnindex.properties中
    1：全部寫操做都隨發送到配置的writeHost

    switchType:切換方式
   -1：不自動切換
    1：自動切換（默認）
    2：基於MySql主從同步的狀態來決定是否切換

    <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