shardingsphere实现数据库读写分离

r囧r小猫 2023-06-27 03:52 97阅读 0赞

## 实验环境： ##

主数据库：userdb\_master

从数据库：userdb\_slave0,userdb\_slave1

数据库各有一个表user

shardingsphere版本：4.0.0-RC3

实验没有实现数据库的主从同步，只是建了数据库叫从库。

## 第一步：建立数据库表 ##

在userdb\_master，userdb\_slave0,userdb\_slave1各建立一张表user

CREATE TABLE `user` (
      `id` bigint(255) NOT NULL AUTO_INCREMENT,
      `name` varchar(255) DEFAULT NULL,
      `uid` varchar(255) DEFAULT NULL,
      `school` varchar(255) DEFAULT NULL,
      `age` int(11) DEFAULT NULL,
      PRIMARY KEY (`id`)
    )

## 第二步：springboot项目中引入shardingsphere,注意要引入两个包 ##

<dependency>
         <groupId>org.apache.shardingsphere</groupId>
          <artifactId>sharding-jdbc-spring-boot-starter</artifactId>
          <version>4.0.0-RC3</version>
     </dependency>
    
    
     <dependency>
          <groupId>org.apache.shardingsphere</groupId>
          <artifactId>sharding-jdbc-spring-namespace</artifactId>
          <version>4.0.0-RC3</version>
     </dependency>

## 第三步：配置application.properties ##

#读写分离配置，即一主多从方式配置
    debug=false
    server.port=8082
    server.servlet.context-path=
    spring.jackson.serialization.INDENT_OUTPUT=true
    spring.profiles.active=
    #spring.main.allow-bean-definition-overriding=true
    
    spring.shardingsphere.datasource.names=db-master-user,db-slave-user,db-slave1-user
    
    spring.shardingsphere.datasource.db-master-user.type=com.zaxxer.hikari.HikariDataSource
    spring.shardingsphere.datasource.db-master-user.driver-class-name=com.mysql.jdbc.Driver
    spring.shardingsphere.datasource.db-master-user.jdbc-url=jdbc:mysql://youripaddress:3306/userdb_master?characterEncoding=utf-8&serverTimezone=UTC
    spring.shardingsphere.datasource.db-master-user.username=
    spring.shardingsphere.datasource.db-master-user.password=
    
    spring.shardingsphere.datasource.db-slave-user.type=com.zaxxer.hikari.HikariDataSource
    spring.shardingsphere.datasource.db-slave-user.driver-class-name=com.mysql.jdbc.Driver
    spring.shardingsphere.datasource.db-slave-user.jdbc-url=jdbc:mysql://youripaddress:3306/userdb_slave0?characterEncoding=utf-8&serverTimezone=UTC
    spring.shardingsphere.datasource.db-slave-user.username=
    spring.shardingsphere.datasource.db-slave-user.password=
    
    spring.shardingsphere.datasource.db-slave1-user.type=com.zaxxer.hikari.HikariDataSource
    spring.shardingsphere.datasource.db-slave1-user.driver-class-name=com.mysql.jdbc.Driver
    spring.shardingsphere.datasource.db-slave1-user.jdbc-url=jdbc:mysql://youripaddress:3306/userdb_slave1?characterEncoding=utf-8&serverTimezone=UTC
    spring.shardingsphere.datasource.db-slave1-user.username=
    spring.shardingsphere.datasource.db-slave1-user.password=
    
    spring.shardingsphere.masterslave.load-balance-algorithm-type=round_robin
    spring.shardingsphere.masterslave.name=ds_ms
    spring.shardingsphere.masterslave.master-data-source-name=db-master-user
    spring.shardingsphere.masterslave.slave-data-source-names=db-slave-user,db-slave1-user

到此配置就完毕了。

## 第四步：验证 ##

自己实现user表的增删改查。

验证的时候，通过代码增加一条数据，发现数据插入主库中。

查询数据的时候，需要自己手动往从库查几条数据做验证，发现代码查询的时候，会轮询去查两个从库。

到此验证完毕。