Create database

#Create database
create database mycat;

#add table
use mycat 
#Create table test
create table test5(id varchar(18) primary key,name varchar(32)) ;

#Create database
create database mycat3;

#add table
use mycat2
#Create table test
create table test5(id varchar(18) primary key,name varchar(32)) ;

Configure MAC at

1. Configure schema.xml

#Edit the configuration document of schema.xml
vim ./conf/schema.xml

#Add virtual table configuration to this place.
 <table name="test5" dataNode="jdbc_node1,jdbc_node2" primaryKey="id" autoIncrement="true" type="global"/>

Here is the complete configuration

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

        <schema name="yellowcong" checkSQLschema="true" sqlMaxLimit="1000">    
                 <table name="test5" dataNode="jdbc_node1,jdbc_node2" primaryKey="id" autoIncrement="true" type="global"/>
        </schema>


        <dataNode name="jdbc_node1" dataHost="localhost" database="mycat" />
        <dataNode name="jdbc_node2" dataHost="localhost" database="mycat2" />

        <dataHost name="localhost" maxCon="1000" minCon="10" balance="0"
                          writeType="0" dbType="mysql" dbDriver="native" switchType="1"  slaveThreshold="100">
                <heartbeat>select user()</heartbeat>

                <writeHost host="hostM1" url="127.0.0.1:3306" user="root" password="root" />

        </dataHost>

</mycat:schema>

Configure server.xml

#Modify server.xml of mycat
vim ./conf/server.xml

#Modify sequnceHandlerType to 2 to indicate the local timestamp method
<property name="sequnceHandlerType">2</property>

Here is the complete configuration

<?xml version="1.0" encoding="UTF-8"?>
<!-- - - Licensed under the Apache License, Version 2.0 (the "License");
        - you may not use this file except in compliance with the License. - You
        may obtain a copy of the License at - - http://www.apache.org/licenses/LICENSE-2.0
        - - Unless required by applicable law or agreed to in writing, software -
        distributed under the License is distributed on an "AS IS" BASIS, - WITHOUT
        WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - See the
        License for the specific language governing permissions and - limitations
        under the License. -->
<!DOCTYPE mycat:server SYSTEM "server.dtd">
<mycat:server xmlns:mycat="http://io.mycat/">
        <system>
        <property name="serverPort">8066</property>
        <property name="useSqlStat">0</property>  <!-- 1 To turn on real-time statistics, 0 to turn off -->
        <property name="useGlobleTableCheck">0</property>  <!-- 1 To enable full overtime consistency detection, 0 to close -->

                <property name="sequnceHandlerType">2</property>

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

                <!--Distributed transaction switch, 0 for unfiltered distributed transactions, 1 for filtered distributed transactions (if only global tables are involved in distributed transactions, then no filtering), 2 for unfiltered distributed transactions,But log distributed transactions-->
                <property name="handleDistributedTransactions">0</property>

                        <!--
                        off heap for merge/order/group/limit      1 On 0 off
                -->
                <property name="useOffHeapForMerge">1</property>

                <!--
                        Unit is m
                -->
                <property name="memoryPageSize">1m</property>

                <!--
                        Unit is k
                -->
                <property name="spillsFileBufferSize">1k</property>

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

                <!--
                        Unit is m
                -->
                <property name="systemReserveMemorySize">384m</property>


                <!--Whether to adopt zookeeper Coordinated switching  -->
                <property name="useZKSwitch">true</property>


        </system>

        <user name="root">
                <property name="password">root</property>
                <property name="schemas">yellowcong</property>
        </user>

        <user name="user">
                <property name="password">user</property>
                <property name="schemas">yellowcong</property>
                <property name="readOnly">true</property>
        </user>

</mycat:server>

Configure sequence? Time? Conf.properties

The following is to configure the machine ID. It is not modified by default.

vim ./conf/sequence_time_conf.properties

#sequence depend on TIME
WORKID=01
DATAACENTERID=01

Test insert data

Restart mycat server

#Connect mycat
mysql -h 127.0.0.1 -P 8066 -u root -proot

#Using yellowocng database
use yellowcong;

#insert data
insert into test5 (name) values ('doubi'),('yellowcong');

ID generation rule ID= 64 bit binary (42 (MS) + 5 (machine ID) + 5 (business code) + 12 (repeated accumulation)

Problem set

Column count doesn't match value count at row 1

The problem is that I wrote NIMA sql wrong. It's embarrassing

Field 'id' doesn't have a default value

This problem means that there is no default id specified. The solution is to configure schema.xml and add autoIncrement="true"

Reference article

http://blog.csdn.net/fighterandknight/article/details/77892927