SpringBoot+mybatis-plus+sharding-jdbc+druid 分表

我的项目是包含多个子modules,这就是其中一个子module,这是完整的需要的maven依赖.

（1）pom文件:

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>cqx-test</artifactId>
        <groupId>cqx-test</groupId>
        <version>0.0.1</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>SpringBootShareDB</artifactId>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
            <version>2.0.2.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <version>2.0.2.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <version>2.0.2.RELEASE</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
            <version>2.0.2.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.16.18</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.46</version>
        </dependency>
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.4.1</version>
            <exclusions>
                <exclusion>
                    <artifactId>spring-boot-starter-jdbc</artifactId>
                    <groupId>org.springframework.boot</groupId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.apache.shardingsphere</groupId>
            <artifactId>sharding-jdbc-spring-boot-starter</artifactId>
            <version>4.1.1</version>
        </dependency>
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-generator</artifactId>
            <version>3.4.1</version>
        </dependency>
        <dependency>
            <groupId>org.apache.velocity</groupId>
            <artifactId>velocity-engine-core</artifactId>
            <version>2.2</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.2.4</version>
        </dependency>
        <dependency>
            <groupId>net.coobird</groupId>
            <artifactId>thumbnailator</artifactId>
            <version>0.4.8</version>
        </dependency>
        <dependency>
            <groupId>com.google.code.gson</groupId>
            <artifactId>gson</artifactId>
            <version>2.8.6</version>
        </dependency>
        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.4</version>
        </dependency>
        <dependency>
            <groupId>com.google.guava</groupId>
            <artifactId>guava</artifactId>
            <version>18.0</version>
        </dependency>
    </dependencies>

</project>

（2）application.yaml 资源配置文件

server:
  port : 18999

spring:
  shardingsphere:
    props:
      sql.show: false
    datasource:
      # 可以配置多个库,此次是单库
      names: local
      local:
        type: com.alibaba.druid.pool.DruidDataSource
        driverClassName: com.mysql.jdbc.Driver
        url: jdbc:mysql://127.0.0.1:3306/sharedb?characterEncoding=UTF-8&useUnicode=true&useSSL=false&serverTimezone=GMT
        username: root
        password: root@123
    sharding:
      tables:
        share_user:
          actualDataNodes: local.share_user_$->{0..2}
          tableStrategy:
            inline:
              # 指定分片键
              shardingColumn: user_id
              # 分片算法
              algorithmExpression: share_user_$->{user_id % 3}

(3)代码结构

(4) 具体代码

1、ShareDBApplication.java

package com.cqx.spring.sharedb;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;

@SpringBootApplication
@EnableAutoConfiguration(exclude = {DataSourceAutoConfiguration.class})
@MapperScan("com.cqx.spring.sharedb.mybatis.mapper")
public class ShareDBApplication {

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

 2、MysqlGenerator.java (用来自动生成mysql-plus代码)

package com.cqx.spring.sharedb;

import com.baomidou.mybatisplus.core.exceptions.MybatisPlusException;
import com.baomidou.mybatisplus.generator.AutoGenerator;
import com.baomidou.mybatisplus.generator.config.*;
import com.baomidou.mybatisplus.generator.config.rules.NamingStrategy;
import org.apache.commons.lang3.StringUtils;

import java.util.Scanner;

/**
 * <p>
 * mysql 代码生成器演示例子
 * </p>
 *
 * @author jobob
 * @since 2018-09-12
 */
public class MysqlGenerator {

    /**
     * <p>
     * 读取控制台内容
     * </p>
     */
    public static String scanner(String tip) {
        Scanner scanner = new Scanner(System.in);
        StringBuilder help = new StringBuilder();
        help.append("请输入").append(tip).append("：");
        System.out.println(help.toString());
        if (scanner.hasNext()) {
            String ipt = scanner.next();
            if (StringUtils.isNotBlank(ipt)) {
                return ipt;
            }
        }
        throw new MybatisPlusException("请输入正确的" + tip + "！");
    }

    /**
     * RUN THIS
     */
    public static void main(String[] args) {
        // 代码生成器
        AutoGenerator mpg = new AutoGenerator();

        // 全局配置
        GlobalConfig gc = new GlobalConfig();
        String projectPath = System.getProperty("user.dir");
        gc.setOutputDir(projectPath + "/SpringBootShareDB/src/main/java");//这个路径根据自己的路径来
        gc.setAuthor("mybatisPlusGenerator");
        gc.setOpen(false);
        mpg.setGlobalConfig(gc);

        // 数据源配置
        DataSourceConfig dsc = new DataSourceConfig();

        dsc.setUrl("jdbc:mysql://127.0.0.1:3306/sharedb?characterEncoding=UTF-8&useUnicode=true&useSSL=false&serverTimezone=GMT");
        dsc.setDriverName("com.mysql.jdbc.Driver");
        dsc.setUsername("root");
        dsc.setPassword("root@123");

        mpg.setDataSource(dsc);

        // 包配置
        PackageConfig pc = new PackageConfig();
        pc.setParent("com.cqx.spring.sharedb.mybatis");
        mpg.setPackageInfo(pc);

        // 配置模板
        TemplateConfig templateConfig = new TemplateConfig();
        templateConfig.setController("");
        templateConfig.setXml(null);
        mpg.setTemplate(templateConfig);

        // 策略配置
        StrategyConfig strategy = new StrategyConfig();
        strategy.setRestControllerStyle(true);
        strategy.setEntityLombokModel(true);
        strategy.setNaming(NamingStrategy.underline_to_camel);//表字段下划线到代码字段驼峰
        strategy.setColumnNaming(NamingStrategy.underline_to_camel);//表字段下划线到代码字段驼峰
        strategy.setInclude(scanner("表名"));
        mpg.setStrategy(strategy);
        mpg.execute();
    }

}

3、TestSpringShareDBController.java

package com.cqx.spring.sharedb.ctrl;

import com.cqx.spring.sharedb.mybatis.entity.ShareUser;
import com.cqx.spring.sharedb.mybatis.service.IShareUserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * @author chaiqx on 2021/3/30
 */
@RestController
public class TestSpringShareDBController {

    @Autowired
    private IShareUserService shareUserService;

    @GetMapping(value = "share_user")
    public int test_share_user() {
        ShareUser shareUser1 = new ShareUser();
        shareUser1.setUserId(5);
        shareUser1.setName("5");
        ShareUser shareUser2 = new ShareUser();
        shareUser2.setUserId(6);
        shareUser2.setName("6");
        ShareUser shareUser3 = new ShareUser();
        shareUser3.setUserId(7);
        shareUser3.setName("7");
        ShareUser shareUser4 = new ShareUser();
        shareUser4.setUserId(8);
        shareUser4.setName("8");
        shareUserService.save(shareUser1);
        shareUserService.save(shareUser2);
        shareUserService.save(shareUser3);
        shareUserService.save(shareUser4);
        return 1;
    }

    @GetMapping(value = "get_user")
    public int test_get_user() {
        System.out.println(shareUserService.list().size());
        return 1;
    }
}

4、ShareUser  、 ShareUserMapper、 IShareUserService、ShareUserServiceImpl 都是自动生成的文件，就不列出来了。

(5)数据库表（只包含id自增,user_id(int11),name(varchar30)）