CREATE DATABASE database0;
USE database0;
DROP TABLE IF EXISTS `user`;
CREATE TABLE `user`(
id bigint(64) not null auto_increment,
city varchar(20) not null,
name varchar(20) not null,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

CREATE DATABASE database1;
USE database1;
DROP TABLE IF EXISTS `user`;
CREATE TABLE `user`(
id bigint(64) not null auto_increment,
city varchar(20) not null,
name varchar(20) not null,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
INSERT INTO `database1`.`user`(`id`, `city`, `name`) VALUES (001, '青岛', '测试库1');

CREATE DATABASE database2;
USE database2;
DROP TABLE IF EXISTS `user`;
CREATE TABLE `user`(
id bigint(64) not null auto_increment,
city varchar(20) not null,
name varchar(20) not null,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
INSERT INTO `database2`.`user`(`id`, `city`, `name`) VALUES (002, '胶州', '测试库2');
2. 新建springboot项目
2.1 pom.xml
<!-- web依赖 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>

<!-- mybatis依赖 -->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.1.3</version>
</dependency>

<!-- mysql依赖 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>

<!-- druid数据库连接池依赖 -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
<version>1.1.23</version>
</dependency>

<!-- ShardingSphere依赖 -->
<dependency>
<groupId>io.shardingsphere</groupId>
<artifactId>sharding-jdbc-spring-boot-starter</artifactId>
<version>3.1.0</version>
</dependency>

<!-- jap依赖 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
2.2 application.yml
server: # 端口号
port: 8888
sharding:
jdbc:
dataSource:
names: db-test0,db-test1,db-test2
# 配置主库
db-test0:
type: com.alibaba.druid.pool.DruidDataSource
driverClassName: com.mysql.jdbc.Driver
url: jdbc:mysql://ip:3306/database0?useUnicode=true&characterEncoding=utf8&tinyInt1isBit=false&useSSL=false&serverTimezone=GMT
username: 账户
password: 密码
#最大连接数
maxPoolSize: 20
db-test1: # 配置第一个从库
type: com.alibaba.druid.pool.DruidDataSource
driverClassName: com.mysql.jdbc.Driver
url: jdbc:mysql://ip:3306/database1?useUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true&useSSL=false&serverTimezone=GMT
username: 账户
password: 密码
maxPoolSize: 20
db-test2: # 配置第二个从库
type: com.alibaba.druid.pool.DruidDataSource
driverClassName: com.mysql.jdbc.Driver
url: jdbc:mysql://ip:3306/database2?useUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true&useSSL=false&serverTimezone=GMT
username: 账户
password: 密码
maxPoolSize: 20
config:
masterslave: # 配置读写分离
load-balance-algorithm-type: round_robin # 配置从库选择策略，提供轮询与随机，这里选择用轮询//random 随机 //round_robin 轮询
name: db1s2
master-data-source-name: db-test0
slave-data-source-names: db-test1,db-test2
props:
sql:
show: true # 开启SQL显示，默认值: false，注意：仅配置读写分离时不会打印日志！！！
spring:
main:
allow-bean-definition-overriding: true # 允许重名的bean可以被覆盖
jpa:
hibernate:
ddl-auto: update # 每次运行程序，没有表格会新建表格，表内有数据不会清空，只会更新
naming: # 驼峰命名法
physical-strategy: org.springframework.boot.orm.jpa.hibernate.SpringPhysicalNamingStrategy
show-sql: true # 打印sql