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”：描述的是当前的连接是否需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"”：该操作使用的数据节点是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"
		/> -->
		<!-- 定义数据的操作节点 -->
        <!-- “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，所有读操作都发送到当前可用的writeHost上
    1：全部的readHost与stand by writeHost参与select语句的负载均衡，
    2：所有读操作都随机在writeHost、readHost上分发
    3：所有读请求随机分发到writeHost对应的readHost执行，writeHost不负担读压力
	
	writeType="0"
	0：所有写操作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，重新启动后以切换后的为准，切换记录在配置文件：dnindex.properties中
    1：所有写操作都随发送到配置的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