二.基于Mysql + Sharding-jdbc +SpringBoot + mybatis配置主从同步,读写分离,分库分表

目录

一.sharding-jdbc（读写分离 分表分库）

1.简介
sharding-jdbc 是一个开源的适用于微服务的分布式数据访问基础类库，它始终以云原生的基础开发套件为目标。只支持java语言
sharding-jdbc定位为轻量级java框架,使用客户端直连数据库,以jar包的形式提供服务,未使用中间层,无需额外部署,并无其他依赖,可以理解为增强版的JDBC驱动
sharding-jdbc完整的实现了分库分表/读写分离/分布式主键功能,并实现了柔性事务.

2.适用于
适用于任何基于Java的ORM框架，如：JPA, Hibernate, Mybatis, Spring JDBC Template或直接使用JDBC。
基于任何第三方的数据库连接池，如：DBCP, C3P0, BoneCP, Druid, HikariCP等。
支持任意实现JDBC规范的数据库。目前支持MySQL，Oracle，SQLServer和PostgreSQL。
2.sharding-jdbc都有哪些包
①　sharding-jdbc-config-parent 配置相关源码
②　sharding-jdbc-core 核心源码
③　sharding-jdbc-doc 文档
④　sharding-jdbc-example：针对各个模块的测试用例代码；
⑤　sharding-jdbc-plugin：目前只有KeyGenerator的三种实现；
⑥　sharding-jdbc-transaction-parent：事务相关源码；
想要更深入了解的，这里献上Apache ShardingSphere官方文档.
3.sharding-jdbc架构图

二.Mysql + Sharding-jdbc +SpringBoot + mybatis配置 读写分离

1.首先创建一个springBoot的项目，项目结构为

2.pom文件配置

        
            org.springframework.boot
            spring-boot-starter-web
        
        
            org.mybatis.spring.boot
            mybatis-spring-boot-starter
            2.1.4
        

        
            mysql
            mysql-connector-java
            runtime
        
        
            commons-dbcp
            commons-dbcp
            1.4
        
        
        
            io.shardingsphere
            sharding-jdbc-spring-boot-starter
            3.0.0.M1
        

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

3.基础类 (直接拷贝粘贴到idea就可)
建表语句

DROP TABLE IF EXISTS `user_test`;
CREATE TABLE `user_test`  (
  `id` bigint(255) NOT NULL AUTO_INCREMENT,
  `name` varchar(30) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL,
  `password` varchar(30) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL,
  PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 9 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;

实体类

package cn.jiawu.shardingdemo.domain;

import lombok.Data;

/**
 * @Author: Wu
 * @Date: 2021/1/26 10:14
 */
@Data
public class UserTest {
    private Integer id;
    private String name;
    private String password;

}

controller

package cn.jiawu.shardingdemo.controller;

import cn.jiawu.shardingdemo.domain.UserTest;
import cn.jiawu.shardingdemo.service.UserTestService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;


import java.util.List;

/**
 * @Author: Wu
 * @Date: 2021/1/26 10:16
 */
@RestController
@RequestMapping("/user")
public class UserTestController {

    @Autowired
    UserTestService userTestService;
    @PostMapping("/add")
    public String addUser(UserTest userTest){
        userTestService.addUser(userTest);
        return "插入成功";

    }
    @GetMapping("/queryAll")
    public List<UserTest> queryAll(){
        List<UserTest> user  = userTestService.queryAll();
        return user;

    }
}

service

package cn.jiawu.shardingdemo.service;

import cn.jiawu.shardingdemo.domain.UserTest;

import java.util.List;

/**
 * @Author: Wu
 * @Date: 2021/1/26 10:22
 */
public interface UserTestService {

    /**
     * 插入插入
     * @param userTest
     */
    void addUser(UserTest userTest);


    /**
     * 查询查询
     * @return
     */
    List<UserTest> queryAll();
 }

package cn.jiawu.shardingdemo.service.impl;

import cn.jiawu.shardingdemo.domain.UserTest;
import cn.jiawu.shardingdemo.mapper.UserTestMapper;
import cn.jiawu.shardingdemo.service.UserTestService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

/**
 * @Author: Wu
 * @Date: 2021/1/26 10:27
 */
@Service
public class UserTestServiceImpl implements UserTestService {
    @Autowired
    UserTestMapper mapper;

    @Override
    public void addUser(UserTest userTest) {
        mapper.addUser(userTest);
    }

    @Override
    public List<UserTest> queryAll() {
        List<UserTest> user = mapper.queryAll();
        return user;
    }
 }

mapper

package cn.jiawu.shardingdemo.mapper;

import cn.jiawu.shardingdemo.domain.UserTest;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;

import java.util.List;

/**
 * @Author: Wu
 * @Date: 2021/1/26 10:27
 */
@Mapper
public interface UserTestMapper {
    /**
     * 插入插入
     * @param userTest
     */
    @Insert("insert into user_test(name,password) values(#{name},#{password})")
    void addUser(UserTest userTest);


    /**
     * 查询查询
     * @return
     */
    @Select("select * from user_test")
    List<UserTest> queryAll();
    }

3.applocation.properties配置文件配置

#主从库的编号（别名）
sharding.jdbc.datasource.names=ds0,ds1,ds2

sharding.jdbc.datasource.ds0.type=org.apache.commons.dbcp.BasicDataSource
sharding.jdbc.datasource.ds0.driver-class-name=com.mysql.jdbc.Driver
sharding.jdbc.datasource.ds0.url=jdbc:mysql://127.0.0.1:3309/lbj?serverTimezone=UTC&&characterEncoding=utf-8
sharding.jdbc.datasource.ds0.username=root
sharding.jdbc.datasource.ds0.password=passwd

sharding.jdbc.datasource.ds1.type=org.apache.commons.dbcp.BasicDataSource
sharding.jdbc.datasource.ds1.driver-class-name=com.mysql.jdbc.Driver
sharding.jdbc.datasource.ds1.url=jdbc:mysql://127.0.0.1:3308/lbj?serverTimezone=UTC&&characterEncoding=utf-8
sharding.jdbc.datasource.ds1.username=root
sharding.jdbc.datasource.ds1.password=passwd


#配置主从策略
#负载均衡策略  随机和轮询 random /round_robin
sharding.jdbc.config.masterslave.load-balance-algorithm-type=round_robin
sharding.jdbc.config.masterslave.name=db1s1
sharding.jdbc.config.masterslave.master-data-source-name=ds0
# sharding.jdbc.config.masterslave.slave-data-source-names=ds1,ds2...可以有多个从库配置
sharding.jdbc.config.masterslave.slave-data-source-names=ds1


# 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！！
sharding.jdbc.config.sharding.props.show=true

配置完毕即可启动项目 利用PostMan请求本地接口地址
4.先分别打开上篇文章我们配置好的master和salve数据库服务日志文件
slave服务器同上
（1）利用postman请求insert方法，
执行方法后观察master.log和slave.log文件变化
master.log 是写库 调用写入方法 日志打印为下
slave.log 的操作记录为主从同步 后的插入 所以是成功的哈
（2）利用postman请求调用select方法，先清空日志文件然后保存
执行方法后观察master.log和slave.log文件变化
master.log 是写库 按照道理来说是不会有查询记录的 查看后确实没有

slave.log 为从库日志 主查询 查看后确实有一条查询记录 那么读写分离就简单的实现了

三.Mysql + Sharding-jdbc +SpringBoot + mybatis配置 分库分表

1.在读写分离的项目上添加mybatis文件夹用于装xml 新建一个applocation-xx.properties配置文件
基础类 (直接拷贝粘贴到idea就可)准备
我们这里用的是一个服务器链接 就在master服务新建两个数据库 shardtest1和shardtest2表结构完全相同

建表语句

CREATE TABLE `t_order_0`  (
  `order_id` bigint(20) NOT NULL AUTO_INCREMENT,
  `user_id` int(11) NULL DEFAULT NULL,
  `status` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  PRIMARY KEY (`order_id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 1 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;
CREATE TABLE `t_order_1`  (
  `order_id` bigint(20) NOT NULL AUTO_INCREMENT,
  `user_id` int(11) NULL DEFAULT NULL,
  `status` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  PRIMARY KEY (`order_id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 1 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;

实体类

package cn.jiawu.shardingdemo.domain;

import lombok.Data;

/**
 * @Author: Wu
 * @Date: 2021/1/26 10:14
 */
@Data
public class Order {

    private long orderId;

    private int userId;

    private String status;

}

controller

package cn.jiawu.shardingdemo.controller;

import cn.jiawu.shardingdemo.domain.Order;
import cn.jiawu.shardingdemo.service.OrderService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
/**
 * @Author: Wu
 * @Date: 2021/1/26 10:14
 */
@RestController
@RequestMapping("/order")
public class OrderController {
    @Autowired
    OrderService service;
    @PostMapping("/test")
    public String test(Order order) {
         service.demo(order);
        return "测试成功";
    }
}

service

package cn.jiawu.shardingdemo.service;

import cn.jiawu.shardingdemo.domain.Order;
import cn.jiawu.shardingdemo.mapper.OrderMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

/**
 * @Author: Wu
 * @Date: 2021/1/26 10:14
 */
@Service
public class OrderService {
    @Autowired
    private OrderMapper orderRepository;
    public void demo(Order order) {
        orderRepository.insert(order);
        System.out.println("插入成功");
    }
}

mapper

package cn.jiawu.shardingdemo.mapper;

import cn.jiawu.shardingdemo.domain.Order;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;

/**
 * @Author: Wu
 * @Date: 2021/1/26 10:14
 */
@Mapper
public interface OrderMapper {

    /**
     * 插入
     * @param order
     * @return
     */
    void insert(@Param("order") Order order);

}

xml

<?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.jiawu.shardingdemo.mapper.OrderMapper">
    <insert id="insert">
     insert into t_order(order_id,user_id,status)
     values(#{order.orderId},#{order.userId},#{order.status})
    </insert>
</mapper>

3.applocation-xx.properties分裤分表

mybatis.type-aliases-package=cn.jiawu.shardingdemo.mapper
mybatis.mapper-locations=classpath*:mybatis/*.xml
mybatis.configuration.cache-enabled=false
#需要用那个配置文件就写哪个比如 xx
spring.profiles.active=xx

#datasource
spring.devtools.remote.restart.enabled=false

sharding.jdbc.datasource.names=ds0,ds1

sharding.jdbc.datasource.ds0.type=org.apache.commons.dbcp.BasicDataSource
sharding.jdbc.datasource.ds0.driver-class-name=com.mysql.jdbc.Driver
sharding.jdbc.datasource.ds0.url=jdbc:mysql://127.0.0.1:3309/shardtest1?serverTimezone=UTC&&characterEncoding=utf-8
sharding.jdbc.datasource.ds0.username=root
sharding.jdbc.datasource.ds0.password=passwd

sharding.jdbc.datasource.ds1.type=org.apache.commons.dbcp.BasicDataSource
sharding.jdbc.datasource.ds1.driver-class-name=com.mysql.jdbc.Driver
sharding.jdbc.datasource.ds1.url=jdbc:mysql://127.0.0.1:3309/shardtest2?serverTimezone=UTC&&characterEncoding=utf-8
sharding.jdbc.datasource.ds1.username=root
sharding.jdbc.datasource.ds1.password=passwd

#分库策略 根据user_id
sharding.jdbc.config.sharding.default-database-strategy.inline.sharding-column=user_id
#对user_id取模 确定数据所在数据库 偶数id在shardtest1 奇数id在shardtest2
sharding.jdbc.config.sharding.default-database-strategy.inline.algorithm-expression=ds$->{user_id % 2}

##分表策略 根据插入数据的组件来确定  奇数的逐渐在t_order_1 偶数t_order_0
sharding.jdbc.config.sharding.tables.t_order.actual-data-nodes=ds$->{0..1}.t_order_$->{0..1}
sharding.jdbc.config.sharding.tables.t_order.table-strategy.inline.sharding-column=order_id
##对订单号进行hash运算  确定数据所在表名
sharding.jdbc.config.sharding.tables.t_order.table-strategy.inline.algorithm-expression=t_order_$->{order_id % 2}
sharding.jdbc.config.sharding.tables.t_order.key-generator-column-name=order_id

测试我们还是利用postman插入数据

user_id如果为奇数 就会在shardtest2库中去存 ，偶数id在shardtest1
order_id奇数的在t_order_1表中存 偶数在t_order_0表中存

各自组合先分裤再分表 运行起来自己观察一下规律吧！！！

次文只是粗略的搭建基于sharding-jdbc实现读写分离分库分表，认知有限，不对之处请各位前辈指点。同时借此博文分享我的学习心得，抛砖引玉。