(04)Mycat实现分库

1、如何选择分库表

#客户表  rows:20万 
CREATE TABLE customer(
    id INT AUTO_INCREMENT,
    NAME VARCHAR(200),
    PRIMARY KEY(id)
);
 
#订单表   rows:600万
CREATE TABLE orders(
    id INT AUTO_INCREMENT,
    order_type INT,
    customer_id INT,
    amount DECIMAL(10,2),
    PRIMARY KEY(id)  
); 
 
#订单详细表     rows:600万
CREATE TABLE orders_detail(
    id INT AUTO_INCREMENT,
    detail VARCHAR(2000),
    order_id INT,
    PRIMARY KEY(id)
);
 
#订单状态字典表   rows:20
CREATE TABLE dict_order_type(
    id INT AUTO_INCREMENT,
    order_type VARCHAR(200),
    PRIMARY KEY(id)
);
 
 select o.*,od.detail,d.order_type 
from orders  o 
inner join orders_detail  od on o.id =od.order_id  
 inner join dict_order_type d on o.order_type=d.id  
where o.customer_id=xxxx

2、schema.xml

<mycat:schema xmlns:mycat="http://io.mycat/">
 
        <schema name="TESTDB" checkSQLschema="false" sqlMaxLimit="100" dataNode="dn1">
                <table name="customer" dataNode="dn2" ></table>
        </schema>
        <dataNode name="dn1" dataHost="host1" database="atguigu_mc" />
        <dataNode name="dn2" dataHost="host2" database="atguigu_sm" />
        <dataHost name="host1" maxCon="1000" minCon="10" balance="2"
                          writeType="0" dbType="mysql" dbDriver="native" switchType="1"  slaveThreshold="100">
                <heartbeat>select user()</heartbeat>
                <writeHost host="hostm1" url="192.168.67.1:3306" user="root"
                                   password="123123">
                       <readHost host="hosts1" url="192.168.67.131:3306" user="root"
                                   password="123123">
                       </readHost>
                </writeHost>
        </dataHost>
        <dataHost name="host2" maxCon="1000" minCon="10" balance="0"
                          writeType="0" dbType="mysql" dbDriver="native" switchType="1"  slaveThreshold="100">
                <heartbeat>select user()</heartbeat>
                <writeHost host="hostm2" url="192.168.67.1:3306" user="root"
                                   password="123123">
                </writeHost>
        </dataHost>
 
</mycat:schema>