mycat实现mysql的读写分离

<?xml version="1.0"?>
<!DOCTYPE mycat:schema SYSTEM "schema.dtd">
<mycat:schema xmlns:mycat="http://org.opencloudb/">
<schema name="alex_schema1" checkSQLschema="false" sqlMaxLimit="100" dataNode="dn1"></schema>
<schema name="alex_schema2" checkSQLschema="false" sqlMaxLimit="100" dataNode="dn2"></schema>


  <dataNode name="dn1" dataHost="localhost1" database="alex" />
  <dataNode name="dn2" dataHost="localhost1" database="alex11" />


<dataHost name="localhost1" maxCon="500" minCon="20" balance="1"
                writeType="0" dbType="mysql" dbDriver="native" switchType="2"  slaveThreshold="100">
                <heartbeat>show slave status</heartbeat>

                <writeHost host="hostM1" url="128.0.0.101:3306" user="root"
                        password="123456" />


                <writeHost host="hostS1" url="128.0.0.102:3306" user="root"
                        password="123456" />

        </dataHost>
</mycat:schema>

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mycat:server SYSTEM "server.dtd">
<mycat:server xmlns:mycat="http://org.opencloudb/">
        <system>
        <property name="defaultSqlParser">druidparser</property>
        <property name="charset">utf8mb4</property>
         </system>

        <user name="user2">
                <property name="password">password</property>
                <property name="schemas">alex_schema1,alex_schema2</property>
        </user>

        <!-- 用户3，只读权限-->
        <user name="user3">
                <property name="password">password</property>
                <property name="schemas">alex_schema1,alex_schema2</property>
                <property name="readOnly">true</property>
        </user>
</mycat:server>

mycat start


mysql -uuser2 -password -h128.0.0.103 -P8066

02/11 13:50:15.573  DEBUG [$_NIOREACTOR-0-RW] (PhysicalDBPool.java:431) -select read source hostS1 for dataHost:localhost1

#看到是conghosts1上面读写的说明是slave节点

02/11 13:57:37.387  DEBUG [$_NIOREACTOR-0-RW] (NonBlockingSession.java:230) -release connection MySQLConnection [id=1, lastTime=1518328657366, schema=alex11, old shema=alex11, borrowed=true, fromSlaveDB=false, threadId=63, charset=utf8, txIsolation=3, autocommit=true, attachment=dn2{INSERT INTO `alex11`.`ee` (`ss`, `aa`) VALUES ('哈哈哈ha', '111111')}, respHandler=SingleNodeHandler [node=dn2{INSERT INTO `alex11`.`ee` (`ss`, `aa`) VALUES ('哈哈哈ha', '111111')}, packetId=0], host=128.0.0.101, port=3306, statusSync=null, writeQueue=0, modifiedSQLExecuted=true]

#看到是从host=128.0.0.101上面写入的说明是master节点