上一篇介绍的了Sharding-JDBC不分库，只分表例子，接下来我们写demo，介绍SpringBoot使用Sharding-JDBC垂直拆分（不同的表在不同的库中）。话不多说，直接写代码。

准备

• SpringBoot 2.1.12
• Sharding-JDBC 4.0.0
• Mybatis 3.x
• Mysql 8.0
• lombok

本文场景介绍

一个数据库，将user表分表分为四个一样的表，根据取模算法分别向user0-3的表里插入数据。

POM文件

pom文件引入如下相关依赖：

<?xml version="1.0" encoding="UTF-8"?>

    4.0.0
    
        cn.cicoding
        shardingsphere-example
        1.0-SNAPSHOT
    
    cn.cicoding
    sharding-jdbc-db-sharding
    0.0.1-SNAPSHOT
    sharding-jdbc-db-sharding
    Demo project for Spring Boot

    
        1.8
    

    
        
            org.springframework.boot
            spring-boot-starter-web
        
        
            org.mybatis.spring.boot
            mybatis-spring-boot-starter
            2.0.1
        

        
            org.apache.shardingsphere
            sharding-jdbc-spring-boot-starter
        

        
            mysql
            mysql-connector-java
        

        
            org.projectlombok
            lombok
            true
        
        
            org.springframework.boot
            spring-boot-starter-test
            test
        
    

    
        
            
                org.springframework.boot
                spring-boot-maven-plugin
            
        
    

相关代码实现

Controller代码

CicodingController代码

package cn.cicoding.controller;

import cn.cicoding.entity.Cicoding;
import cn.cicoding.service.CicodingService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class CicodingController {
	
	@Autowired
	private CicodingService cicodingService;
	
	@GetMapping("/cis")
	public Object list() {
		return cicodingService.list();
	}
	
	@GetMapping("/ci/add")
	public Object add() {
		for (long i = 0; i < 10; i++) {
			Cicoding cicoding = new Cicoding();
			cicoding.setId(i+"a");
			cicoding.setCity("深圳");
			cicoding.setRegion("宝安");
			cicoding.setName("李四");
			cicoding.setLdNum("A");
			cicoding.setUnitNum("2");
			cicodingService.addCicoding(cicoding);
		}
		return "success";
	}
	
}

UserController代码

package cn.cicoding.controller;

import cn.cicoding.entity.User;
import cn.cicoding.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class UserController {
	
	@Autowired
	private UserService userService;
	
	@GetMapping("/users")
	public Object list() {
		return userService.list();
	}
	
	@GetMapping("/add")
	public Object add() {
		for (long i = 0; i < 100; i++) {
			User user = new User();
			user.setCity("深圳");
			user.setName("李四");
			userService.add(user);
		}
		return "success";
	}
	
	@GetMapping("/users/{id}")
	public Object get(@PathVariable Long id) {
		return userService.findById(id);
	}
	
	@GetMapping("/users/query")
	public Object get(String name) {
		return userService.findByName(name);
	}
	
}

Service代码

CicodingService代码

package cn.cicoding.service;

import java.util.List;

import cn.cicoding.entity.Cicoding;

public interface CicodingService {

	List list();
	
	Long addCicoding(Cicoding cicoding);
		
}

UserService代码

package cn.cicoding.service;

import cn.cicoding.entity.User;

import java.util.List;

public interface UserService {

	List list();
	
	Long add(User user);
	
	User findById(Long id);
	
	User findByName(String name);
	
}

CicodingServiceImpl代码

package cn.cicoding.service;

import java.util.List;

import cn.cicoding.entity.Cicoding;
import cn.cicoding.repository.CicodingRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class CicodingServiceImpl implements CicodingService {

	@Autowired
	private CicodingRepository cicodingRepository;
	
	@Override
	public List list() {
		return cicodingRepository.list();
	}

	@Override
	public Long addCicoding(Cicoding cicoding) {
		return cicodingRepository.addCicoding(cicoding);
	}

}

UserServiceImpl代码

package cn.cicoding.service;

import java.util.List;

import cn.cicoding.entity.User;
import cn.cicoding.repository.UserRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class UserServiceImpl implements UserService {

	@Autowired
	private UserRepository userRepository;
	
	public List list() {
		return userRepository.list();
	}

	public Long add(User user) {
		return userRepository.addUser(user);
	}

	@Override
	public User findById(Long id) {
		return userRepository.findById(id);
	}

	@Override
	public User findByName(String name) {
		return userRepository.findByName(name);
	}

}

Repository代码

CicodingRepository代码

package cn.cicoding.repository;

import java.util.List;

import cn.cicoding.entity.Cicoding;
import org.apache.ibatis.annotations.Mapper;


@Mapper
public interface CicodingRepository {
	
	Long addCicoding(Cicoding cicoding);
	
	List list();
}

UserRepository代码

package cn.cicoding.repository;

import java.util.List;

import cn.cicoding.entity.User;
import org.apache.ibatis.annotations.Mapper;

@Mapper
public interface UserRepository {
	
	Long addUser(User user);
	
	List list();
	
	User findById(Long id);
	
	User findByName(String name);
}

Mapper.xml代码实现

CicodingMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>


    
    
        
        
        
        
        
        
    
    
    
        INSERT INTO cicoding (
           id, city, region, name, ld_num, unit_num
        )
        VALUES (
           #{id,jdbcType=VARCHAR},
           #{city,jdbcType=VARCHAR},
           #{region,jdbcType=VARCHAR},
           #{name,jdbcType=VARCHAR},
           #{ldNum,jdbcType=VARCHAR},
           #{unitNum,jdbcType=VARCHAR}
        )
    
   
    
        SELECT ld.* FROM cicoding ld
    
       

UserMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>


    
    
        
        
        
    
    
    
        INSERT INTO user (
           city, name
        )
        VALUES (
        #{city,jdbcType=VARCHAR},
        #{name,jdbcType=VARCHAR}
        )
    
   
    
        SELECT u.* FROM user u
    
	
	
        SELECT u.* FROM user u WHERE u.id=#{id,jdbcType=INTEGER}
    
    
    
        SELECT u.* FROM user u WHERE u.name=#{name,jdbcType=VARCHAR}
    
    

实体类

Cicoding

package cn.cicoding.entity;

import lombok.Data;

/**
 * 不分表
 * @author zhaokejin
 *
 */
@Data
public class Cicoding {

	private String id;
	
	private String city;
	
	private String region;
	
	private String name;
	
	private String ldNum;
	
	private String unitNum;
	
}



User
    
package cn.cicoding.entity;

import java.io.Serializable;

/**
 * 分表
 * @author zhaokejin
 *
 */
public class User implements Serializable {

	private static final long serialVersionUID = -1205226416664488559L;
	
	private Long id;

	private String city = "";
	
	private String name = "";

	public Long getId() {
		return id;
	}

	public void setId(Long id) {
		this.id = id;
	}

	public String getCity() {
		return city;
	}

	public void setCity(String city) {
		this.city = city;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}
	
	
}

到这我们完成了基本的代码编写，由于sharding-jdbc是jar包，我们来看主要的配置信息

#Sharding JDBC 垂直拆分（不同的表在不同的库中）
server.port=8084

# mybatis对应的映射文件路径
mybatis.mapper-locations=classpath:mapper/*.xml
# mybatis对应的实体类
mybatis.type-aliases-package=cn.cicoding.model

spring.shardingsphere.datasource.names=ds0,ds1

# 数据源
spring.shardingsphere.datasource.ds0.type=com.zaxxer.hikari.HikariDataSource
spring.shardingsphere.datasource.ds0.driver-class-name=com.mysql.cj.jdbc.Driver
spring.shardingsphere.datasource.ds0.jdbc-url=jdbc:mysql://localhost:3309/ds0?useSSL=false&useUnicode=true&characterEncoding=utf8&serverTimezone=UTC
spring.shardingsphere.datasource.ds0.username=root
spring.shardingsphere.datasource.ds0.password=root

spring.shardingsphere.datasource.ds1.type=com.zaxxer.hikari.HikariDataSource
spring.shardingsphere.datasource.ds1.driver-class-name=com.mysql.cj.jdbc.Driver
spring.shardingsphere.datasource.ds1.jdbc-url=jdbc:mysql://localhost:3309/ds1?useSSL=false&useUnicode=true&characterEncoding=utf8&serverTimezone=UTC
spring.shardingsphere.datasource.ds1.username=root
spring.shardingsphere.datasource.ds1.password=root

# 绑定cicoding表所在节点
spring.shardingsphere.sharding.tables.cicoding.actual-data-nodes=ds1.cicoding

# 绑定user表所在节点
spring.shardingsphere.sharding.tables.user.actual-data-nodes=ds0.user
spring.shardingsphere.sharding.tables.user.key-generator.column=id
spring.shardingsphere.sharding.tables.user.key-generator.type=SNOWFLAKE

# 显示SQL
spring.shardingsphere.props.sql.show=true

启动类

package cn.cicoding;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

/**
 * Sharding JDBC 垂直拆分（不同的表在不同的库中）
 */
@SpringBootApplication
public class ShardingJdbcDbShardingApplication {

   public static void main(String[] args) {
      SpringApplication.run(ShardingJdbcDbShardingApplication.class, args);
   }

}

测试演示

启动启动类，访问http://localhost:8084/add

http://localhost:8084/cis

分别进入不同的库！

到此我们就实现了sharding-jdbc主从读写分离实现，更多配置请参考此处！