SpringBoot+mybatis-plus+sharding-jdbc+dynamic+druid+ 多库分表

接上一篇博客，实现了SpringBoot+mybatis-plus+sharding-jdbc+druid 分表， 这一篇可以支持多个库动态切换分表操作。

(1)代码结构

（2）pom文件

    
        cqx-test
        cqx-test
        0.0.1
    
    4.0.0

    SpringBootShareMutilDB

    
        
            org.springframework.boot
            spring-boot-starter
            2.0.2.RELEASE
        
        
            org.springframework.boot
            spring-boot-starter-web
            2.0.2.RELEASE
        
        
            org.springframework.boot
            spring-boot-starter-test
            2.0.2.RELEASE
            test
        
        
            org.springframework.boot
            spring-boot-starter-jdbc
            2.0.2.RELEASE
        
        
            org.projectlombok
            lombok
            1.16.18
            provided
        
        
            mysql
            mysql-connector-java
            5.1.46
        
        
            com.baomidou
            mybatis-plus-boot-starter
            3.4.1
            
                
                    spring-boot-starter-jdbc
                    org.springframework.boot
                
            
        
        
        com.baomidou
        dynamic-datasource-spring-boot-starter
        3.3.2
        
        
            org.apache.shardingsphere
            sharding-jdbc-spring-boot-starter
            4.1.1
        
        
            org.apache.shardingsphere
            sharding-jdbc-spring-namespace
            4.1.1
        
        
            com.baomidou
            mybatis-plus-generator
            3.4.1
        
        
            org.apache.velocity
            velocity-engine-core
            2.2
        
        
            com.alibaba
            druid-spring-boot-starter
            1.1.10
        
        
            com.alibaba
            druid
            1.2.4
        
        
            net.coobird
            thumbnailator
            0.4.8
        
        
            com.google.code.gson
            gson
            2.8.6
        
        
            commons-io
            commons-io
            2.4
        
        
            com.google.guava
            guava
            18.0
        
    

(3)application.yaml

server:
  port : 18997

spring:
  shardingsphere:
      props:
        sql.show: false
      datasource:
        # 可以配置多个库
        names: db1,db2
        db1:
          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
        db2:
          type: com.alibaba.druid.pool.DruidDataSource
          driverClassName: com.mysql.jdbc.Driver
          url: jdbc:mysql://127.0.0.1:3306/sharedb2?characterEncoding=UTF-8&useUnicode=true&useSSL=false&serverTimezone=GMT
          username: root
          password: root@123
      sharding:
        tables:
          share_user:
            actualDataNodes: db1.share_user_$->{0..2}
            tableStrategy:
              inline:
                # 指定分片键
                shardingColumn: user_id
                # 分片算法
                algorithmExpression: share_user_$->{user_id % 3}
          my_user:
            actualDataNodes: db2.my_user_$->{0..1}
            tableStrategy:
              inline:
               # 指定分片键
                shardingColumn: user_id
               # 分片算法
                algorithmExpression: my_user_$->{user_id % 2}
  datasource:
      dynamic:
        primary: db1 #设置默认的数据源或者数据源组,默认值即为db1
        strict: false #设置严格模式,默认false不启动. 启动后在未匹配到指定数据源时候会抛出异常,不启动则使用默认数据源.
        druid: #以下均为默认值
            initial-size: 4
            max-active: 50
            min-idle: 5
            max-wait: -1
            min-evictable-idle-time-millis: 30000
            max-evictable-idle-time-millis: 30000
            time-between-eviction-runs-millis: 0
            validation-query: select 1
            validation-query-timeout: -1
            test-on-borrow: false
            test-on-return: false
            test-while-idle: true
            pool-prepared-statements: true
            filters: stat,wall
            share-prepared-statements: true
        datasource:
              db1:
                url: jdbc:mysql://127.0.0.1:3306/sharedb?characterEncoding=UTF-8&useUnicode=true&useSSL=false&serverTimezone=GMT
                username: root
                password: root@123
              db2:
                url: jdbc:mysql://127.0.0.1:3306/sharedb2?characterEncoding=UTF-8&useUnicode=true&useSSL=false&serverTimezone=GMT
                username: root
                password: root@123

(4)代码

1、MysqlGenerator.java

package com.cqx.spring.sharemutildb;

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;

/**
 * 

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

    /**
     * 

     * 读取控制台内容
     * 
     */
    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");//自己的目录
        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");

        dsc.setUrl("jdbc:mysql://127.0.0.1:3306/sharedb2?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);
        strategy.setColumnNaming(NamingStrategy.underline_to_camel);
        strategy.setInclude(scanner("表名"));
        mpg.setStrategy(strategy);
        mpg.execute();
    }

}

2、ShareMutilDBApplication.java

package com.cqx.spring.sharemutildb;

import com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceAutoConfigure;
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, DruidDataSourceAutoConfigure.class})
@MapperScan("com.cqx.spring.sharemutildb.mybatis.mapper")
public class ShareMutilDBApplication {

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

3、ShareMutilDbDataSourceConfig.java 这个就是将shardingDataScource整合到dynamic中的最重要的配置

package com.cqx.spring.sharemutildb.config;

import com.baomidou.dynamic.datasource.DynamicRoutingDataSource;
import com.baomidou.dynamic.datasource.provider.AbstractDataSourceProvider;
import com.baomidou.dynamic.datasource.provider.DynamicDataSourceProvider;
import com.baomidou.dynamic.datasource.spring.boot.autoconfigure.DataSourceProperty;
import com.baomidou.dynamic.datasource.spring.boot.autoconfigure.DynamicDataSourceAutoConfiguration;
import com.baomidou.dynamic.datasource.spring.boot.autoconfigure.DynamicDataSourceProperties;
import org.apache.shardingsphere.shardingjdbc.spring.boot.SpringBootConfiguration;
import org.springframework.boot.autoconfigure.AutoConfigureBefore;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Lazy;
import org.springframework.context.annotation.Primary;

import javax.annotation.Resource;
import javax.sql.DataSource;
import java.util.Map;

/**
 * @author chaiqx on 2022/2/17
 */
@Configuration
@AutoConfigureBefore({DynamicDataSourceAutoConfiguration.class, SpringBootConfiguration.class})
public class ShareMutilDbDataSourceConfig {

    @Resource
    private DynamicDataSourceProperties properties;

    @Lazy
    @Resource(name = "shardingDataSource") //shardingSphereDataSource
    private DataSource shardingSphereDataSource;

//    @Resource(name = "masterSlaveDataSource")
//    private DataSource masterSlaveDataSource;

    @Bean
    public DynamicDataSourceProvider dynamicDataSourceProvider() {
        Map datasourceMap = properties.getDatasource();
        return new AbstractDataSourceProvider() {
            @Override
            public Map loadDataSources() {
                Map dataSourceMap = createDataSourceMap(datasourceMap);
                dataSourceMap.put("sharding", shardingSphereDataSource);
                //打开下面的代码可以把 shardingjdbc 管理的数据源也交给动态数据源管理 (根据自己需要选择开启)
//                dataSourceMap.putAll(((MasterSlaveDataSource) masterSlaveDataSource).getDataSourceMap());
                return dataSourceMap;
            }
        };
    }

    /**
     * 将动态数据源设置为首选的
     * 当spring存在多个数据源时, 自动注入的是首选的对象
     * 设置为主要的数据源之后，就可以支持shardingjdbc原生的配置方式了
     */
    @Primary
    @Bean
    public DataSource dataSource(DynamicDataSourceProvider dynamicDataSourceProvider) {
        DynamicRoutingDataSource dataSource = new DynamicRoutingDataSource();
        dataSource.setPrimary(properties.getPrimary());
        dataSource.setStrict(properties.getStrict());
        dataSource.setStrategy(properties.getStrategy());
        dataSource.setProvider(dynamicDataSourceProvider);
        dataSource.setP6spy(properties.getP6spy());
        dataSource.setSeata(properties.getSeata());
        return dataSource;
    }
}

4、TestSpringShareDBController.java

package com.cqx.spring.sharemutildb.ctrl;

import com.cqx.spring.sharemutildb.mybatis.entity.MyUser;
import com.cqx.spring.sharemutildb.mybatis.entity.ShareUser;
import com.cqx.spring.sharemutildb.mybatis.service.IMyUserService;
import com.cqx.spring.sharemutildb.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;

    @Autowired
    private IMyUserService myUserService;


    @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);

        MyUser myUser1 = new MyUser();
        myUser1.setUserId(5);
        myUser1.setName("5");
        MyUser myUser2 = new MyUser();
        myUser2.setUserId(6);
        myUser2.setName("6");
        MyUser myUser3 = new MyUser();
        myUser3.setUserId(7);
        myUser3.setName("7");
        MyUser myUser4 = new MyUser();
        myUser4.setUserId(8);
        myUser4.setName("8");
        myUserService.save(myUser1);
        myUserService.save(myUser2);
        myUserService.save(myUser3);
        myUserService.save(myUser4);
        return 1;
    }

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

}

5、自动生成的代码就不累赘了。但是需要注意两个地方：MyUserServiceImpl.java 和 ShareUserServiceImpl.java 

package com.cqx.spring.sharemutildb.mybatis.service.impl;

import com.baomidou.dynamic.datasource.annotation.DS;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.cqx.spring.sharemutildb.mybatis.entity.MyUser;
import com.cqx.spring.sharemutildb.mybatis.mapper.MyUserMapper;
import com.cqx.spring.sharemutildb.mybatis.service.IMyUserService;
import org.springframework.stereotype.Service;

/**
 * 

 *  服务实现类
 * 
 *
 * @author mybatisPlusGenerator
 * @since 2022-02-17
 */
@Service
@DS("sharding")//这个是必须要加的，就是config配置的那个
public class MyUserServiceImpl extends ServiceImpl implements IMyUserService {

}

package com.cqx.spring.sharemutildb.mybatis.service.impl;

import com.baomidou.dynamic.datasource.annotation.DS;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.cqx.spring.sharemutildb.mybatis.entity.ShareUser;
import com.cqx.spring.sharemutildb.mybatis.mapper.ShareUserMapper;
import com.cqx.spring.sharemutildb.mybatis.service.IShareUserService;
import org.springframework.stereotype.Service;

/**
 * 

 *  服务实现类
 * 
 *
 * @author mybatisPlusGenerator
 * @since 2022-02-17
 */
@Service
@DS("sharding")
public class ShareUserServiceImpl extends ServiceImpl implements IShareUserService {

}

(5)数据库和表   （都只包含id自增,user_id(int11),name(varchar30)）