9、ShardingSphere 之 Sharding-Proxy 读写分离

1 创建三个数据库

一主二从

CREATE SCHEMA `demo_ds_master` DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci ;

CREATE SCHEMA `demo_ds_slave_0` DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci ;

CREATE SCHEMA `demo_ds_slave_1` DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci ;

2 修改conf目录的conf-master-slave.yaml

schemaName: master_slave_db

dataSources:
  master_ds:
    url: jdbc:mysql://127.0.0.1:3306/demo_ds_master?serverTimezone=UTC&useSSL=false
    username: root
    password: chengwen
    connectionTimeoutMilliseconds: 30000
    idleTimeoutMilliseconds: 60000
    maxLifetimeMilliseconds: 1800000
    maxPoolSize: 50
  slave_ds_0:
    url: jdbc:mysql://127.0.0.1:3306/demo_ds_slave_0?serverTimezone=UTC&useSSL=false
    username: root
    password: chengwen
    connectionTimeoutMilliseconds: 30000
    idleTimeoutMilliseconds: 60000
    maxLifetimeMilliseconds: 1800000
    maxPoolSize: 50
  slave_ds_1:
    url: jdbc:mysql://127.0.0.1:3306/demo_ds_slave_1?serverTimezone=UTC&useSSL=false
    username: root
    password: chengwen
    connectionTimeoutMilliseconds: 30000
    idleTimeoutMilliseconds: 60000
    maxLifetimeMilliseconds: 1800000
    maxPoolSize: 50

masterSlaveRule:
  name: ms_ds
  masterDataSourceName: master_ds
  slaveDataSourceNames:
    - slave_ds_0
    - slave_ds_1

3 启动Sharding-Proxy服务

3.1 进入Sharding-Proxy的bin目录

chengwen@chengwen bin % ./start.sh 
Starting the Sharding-Proxy ...
Please check the STDOUT file: /Users/chengwen/apache-shardingsphere-incubating-4.0.1-sharding-proxy-bin/logs/stdout.log
chengwen@MacBook-Pro bin % 

3.2 出现3307端口并且ACTIVE表示启动成功

[INFO ] 12:28:06.822 [nioEventLoopGroup-2-1] i.n.handler.logging.LoggingHandler - [id: 0xcedc789a] REGISTERED
[INFO ] 12:28:06.823 [nioEventLoopGroup-2-1] i.n.handler.logging.LoggingHandler - [id: 0xcedc789a] BIND: 0.0.0.0/0.0.0.0:3307
[INFO ] 12:28:06.825 [nioEventLoopGroup-2-1] i.n.handler.logging.LoggingHandler - [id: 0xcedc789a, L:/0.0.0.0:3307] ACTIVE

4 通过Navicat for MySQL 连接sharding-proxy 服务端

4.1 查看数据库

show DATABASES;

master_slave_db
sharding_db

4.1 在主数据库和从数据库中都创建表

USE master_slave_db;

create table if not exists demo_ds_master.t_order(
order_id bigint not null,
user_id int not null,
status varchar(50),
primary key(order_id)
);

create table if not exists demo_ds_slave_0.t_order(
order_id bigint not null,
user_id int not null,
status varchar(50),
primary key(order_id)
);

create table if not exists demo_ds_slave_1.t_order(
order_id bigint not null,
user_id int not null,
status varchar(50),
primary key(order_id)
);

show tables;

t_order

4.2 向表中添加数据（不指定数据库）

insert into t_order(order_id,user_id,status) values (11,1,'init');

默认向主表中添加数据

默认从库中查询数据，从库中没有查到，主库中可以查到，实现了读写分离。

4.3 分别向从库中添加数据

insert into demo_ds_slave_0.t_order(order_id,user_id,status) values (12,1,'init');

insert into demo_ds_slave_1.t_order(order_id,user_id,status) values (13,1,'init');

5 在不指定数据库时查询数据，会交替查询从库0 和从库1