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Sharding-JDBC 垂直拆分(不同的表在不同的库中)

目录

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:

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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>cn.cicoding</groupId>
<artifactId>shardingsphere-example</artifactId>
<version>1.0-SNAPSHOT</version>
</parent>
<groupId>cn.cicoding</groupId>
<artifactId>sharding-jdbc-db-sharding</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>sharding-jdbc-db-sharding</name>
<description>Demo project for Spring Boot</description>

<properties>
<java.version>1.8</java.version>
</properties>

<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.0.1</version>
</dependency>

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

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

<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>

<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>

</project>

相关代码实现

Controller代码

CicodingController代码

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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

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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

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package cn.cicoding.service;

import java.util.List;

import cn.cicoding.entity.Cicoding;

public interface CicodingService {

List<Cicoding> list();

Long addCicoding(Cicoding cicoding);

}

UserService代码

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package cn.cicoding.service;

import cn.cicoding.entity.User;

import java.util.List;

public interface UserService {

List<User> list();

Long add(User user);

User findById(Long id);

User findByName(String name);

}

CicodingServiceImpl代码

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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<Cicoding> list() {
return cicodingRepository.list();
}

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

}

UserServiceImpl代码

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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<User> 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

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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<Cicoding> list();
}

UserRepository代码

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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<User> list();

User findById(Long id);

User findByName(String name);
}

Mapper.xml代码实现

CicodingMapper.xml

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<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="cn.cicoding.repository.CicodingRepository">

<resultMap id="baseResultMap" type="cn.cicoding.entity.Cicoding">
<result column="id" property="id" jdbcType="VARCHAR" />
<result column="city" property="city" jdbcType="VARCHAR" />
<result column="region" property="region" jdbcType="VARCHAR" />
<result column="name" property="name" jdbcType="VARCHAR" />
<result column="ld_num" property="ldNum" jdbcType="VARCHAR" />
<result column="unit_num" property="unitNum" jdbcType="VARCHAR" />
</resultMap>

<insert id="addCicoding">
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}
)
</insert>

<select id="list" resultMap="baseResultMap">
SELECT ld.* FROM cicoding ld
</select>

</mapper>

UserMapper.xml

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<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="cn.cicoding.repository.UserRepository">

<resultMap id="baseResultMap" type="cn.cicoding.entity.User">
<result column="id" property="id" jdbcType="INTEGER" />
<result column="city" property="city" jdbcType="VARCHAR" />
<result column="name" property="name" jdbcType="VARCHAR" />
</resultMap>

<insert id="addUser">
INSERT INTO user (
city, name
)
VALUES (
#{city,jdbcType=VARCHAR},
#{name,jdbcType=VARCHAR}
)
</insert>

<select id="list" resultMap="baseResultMap">
SELECT u.* FROM user u
</select>

<select id="findById" resultMap="baseResultMap">
SELECT u.* FROM user u WHERE u.id=#{id,jdbcType=INTEGER}
</select>

<select id="findByName" resultMap="baseResultMap">
SELECT u.* FROM user u WHERE u.name=#{name,jdbcType=VARCHAR}
</select>

</mapper>

实体类

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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

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#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

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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

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