shardingsphere实现数据库读写分离

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

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

<!-- for spring namespace -->
 <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。