4、ShardingSphere 之 Sharding-JDBC 实现垂直分库

1 实现垂直分库，专库专表

实现目标，用户查询用户信息的时候，只操作user_db中t_user表

2 创建数据库

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

3 创建数据表

CREATE TABLE `userdb`.`t_user` (`user_id` BIGINT NOT NULL,`user_name` VARCHAR(45) NOT NULL,`u_status` VARCHAR(45) NOT NULL,PRIMARY KEY (`user_id`));

4 创建po

package com.ccb.sharding.po;import com.baomidou.mybatisplus.annotation.TableName;@TableName("t_user") public class User {private Long userId;private String userName;private String uStatus;public Long getUserId() {return userId;}public void setUserId(Long userId) {this.userId = userId;}public String getUserName() {return userName;}public void setUserName(String userName) {this.userName = userName;}public String getuStatus() {return uStatus;}public void setuStatus(String uStatus) {this.uStatus = uStatus;}@Overridepublic String toString() {return "User{" +"userId=" + userId +", userName='" + userName + '\'' +", uStatus='" + uStatus + '\'' +'}';} }

5 创建 UserMapper 接口

package com.ccb.sharding.mapper;import com.baomidou.mybatisplus.core.mapper.BaseMapper; import com.ccb.sharding.po.User; import org.springframework.stereotype.Repository;@Repository public interface UserMapper extends BaseMapper<User> {}

6 创建application.properties配置分片策略 专库专表

# sharding-JDBC分片策略（垂直分库） # 配置数据源，给数据源命名 # 垂直分库，配置数据源 spring.shardingsphere.datasource.names=ds0# 配置数据源具体内容，连接池、驱动、地址、用户名和密码 spring.shardingsphere.datasource.ds0.type=com.alibaba.druid.pool.DruidDataSource spring.shardingsphere.datasource.ds0.driver-class-name=com.mysql.cj.jdbc.Driver spring.shardingsphere.datasource.ds0.url=jdbc:mysql://localhost:3306/userdb?serverTimezone=GMT%2B8 spring.shardingsphere.datasource.ds0.username=root spring.shardingsphere.datasource.ds0.password=chengwen# 一个实体类对应两张表，覆盖 spring.main.allow-bean-definition-overriding=true# 配置user_db数据库里面t_user 专库专表 spring.shardingsphere.sharding.tables.t_user.actual-data-nodes=ds$->{0}.t_user# 配置user_db数据库里面 t_user 表里面主键 user_id 生成策略 SNOWFLAKE 雪花算法 spring.shardingsphere.sharding.tables.t_user.key-generator.column=user_id spring.shardingsphere.sharding.tables.t_user.key-generator.type=SNOWFLAKE# 指定表分片策略 约定user_id的值添加到t_user表 spring.shardingsphere.sharding.tables.t_user.table-strategy.inline.sharding-column=user_id spring.shardingsphere.sharding.tables.t_user.table-strategy.inline.algorithm-expression=t_user# 打印sql输出日志 spring.shardingsphere.props.sql.show=true

7 Test

package com.ccb.sharding;import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper; import com.ccb.sharding.mapper.UserMapper; import com.ccb.sharding.po.User; import org.junit.jupiter.api.Test; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.boot.test.context.SpringBootTest;@SpringBootTest class ShardingApplicationTests {@AutowiredCourseMapper courseMapper;@AutowiredUserMapper userMapper;// ================= 测试水平分表 ======================@Testpublic void addUser() {User user = new User();user.setUserName("Tom");user.setuStatus("A");userMapper.insert(user);}@Testpublic void getUser(){QueryWrapper queryWrapper = new QueryWrapper();queryWrapper.eq("user_id",482828647158251521L);User cuser = userMapper.selectOne(queryWrapper);System.out.println(cuser);} }

8 Test result

专库专表 新增
专库专表 查询

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