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MyBatis-Flex+ShardingSphere-JDBC多数据源分库分表实现

开发者 https://www.devze.com 2024-10-29 14:40 出处：网络 作者： 墨辰李
目录1、目的2、实现2-1、导入MyBATis-Flex和ShardingSphere-JDBC的相关依赖2-2、配置初始化的数据库连接用来加载配置，当然用配置中心来保存初始化数据的配置2-3、初始化数据源进行配置查询2-4、初始化ShardingDataS
相关专题：MyBatis-Flex ShardingSphere-JDBC 分库分表MyBatis-Flex 分库分表
目录
  • 1、目的
  • 2、实现
    • 2-1、导入MyBATis-Flex和ShardingSphere-JDBC的相关依赖
    • 2-2、配置初始化的数据库连接用来加载配置，当然用配置中心来保存初始化数据的配置
    • 2-3、初始化数据源进行配置查询
    • 2-4、初始化ShardingDataSource数据源实现分库分表
    • 2-5、两个数据库连接server-order0和server-order1的表结构如下：分别在两个库当中运行
    • 2-6、实体这个@Table(“t_order”)是逻辑表名ShardingConfig分库策略时设置的
    • 2-7、mapper
  • 3、测试
    • 3-1、测试分库分表的新增
    • 3-2、测试分页查询：
    • 3-3、测试事务问题

1、目的

用于动态配置ShardingSphere-JDBC实现配置化分库分表

2、实现

2-1、导入MyBatis-Flex和ShardingSphere-JDBC的相关依赖

        <dependency>
            <groupId>com.mybatis-flex</groupId>
            <artifactId>mybatis-flex-spring-boot-starter</artifactId>
            <version>1.9.3</version>
        </dependency>
        <dependency>
            <groupId>org.apache.shardingsphere</groupId>
            <artifactId>shardingsphere-jdbc-core-spring-boot-starter</artifactId>
            <version>5.1.1</version>
        </dependency>

2-2、配置初始化的数据库连接用来加载配置，当然用配置中心来保存初始化数据的配置

spring.datasource.ds1.jdbc-url=jdbc:mysql://localhost/test?allowpublicKeyRetrieval=true
spring.datasource.ds1.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.ds1.username=root
spring.datasource.ds1.password=123456
spring.datasource.ds1.type=com.zaxxer.hikari.HikariDataSource

2-3、初始化数据源进行配置查询

初始化数据源配置类：

package com.mochenli.shardingshere.config;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.jdbc.DataSourceBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import Javax.sql.DataSource;

/**
 * @author: MoChenLi
 * @description:
 * @createTime: 2024-06-27 21:23
 */
@Configuration
public class DataSourceConfig {
    /**
     * 根据配置文件构建数据源
     * @return
     */
    @Bean
    @ConfigurationProperties(prefix = "spring.datasource.ds1")
    public DataSource dataSourceOne(){
      return DataSourceBuilder.create().build();
    }

}

数据配置表以及数据

/*
 Navicat Premium Data Transfer

 Source Server         : localhost
 Source Server Type    : MySQL
 Source Server Version : 80034 (8.0.34)
 Source Host           : localhost:3306
 Source Schema         : test

 Target Server Type    : MySQL
 Target Server Version : 80034 (8.0.34)
 File Encoding         : 65001

 Date: 29/06/2024 17:52:36
*/

SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;

-- ----------------------------
-- Table structure for databaseconfig
-- ----------------------------
DROP TABLE IF EXISTS `databasecon编程客栈fig`;
CREATE TABLE `databaseconfig`  (
  `id` int NOT NULL AUTO_INCREMENT COMMENT '主键唯一标识',
  `jdbc_url` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL COMMENT '数据库连接',
  `driver_class_name` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL COMMENT '数据库连接驱动',
  `username` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL COMMENT '数据库连接用户名',
  `password` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL COMMENT '数据库连接密码',
  `Connection_name` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL COMMENT '数据库连接名称',
  PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 3 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_0900_ai_ci ROW_FORMAT = Dynamic;

-- ----------------------------
-- Records of databaseconfig
-- ----------------------------
INSERT INTO `databaseconfig` VALUES (1, 'jdbc:mysql://192.168.157.129:3310/db_order?allowPublicKeyRetrieval=true', 'com.mysql.cj.jdbc.Driver', 'root', '123456', 'server-order0');
INSERT INTO `databaseconfig` VALUES (2, 'jdbc:mysql://192.168.157.129:3311/db_order?allowPublicKeyRetrieval=true', 'com.mysql.cj.jdbc.Driver', 'root', '123456', 'server-order1');

SET FOREIGN_KEY_CHECKS = 1;

数据库配置对象类

package com.mochenli.shardingshere.entity;
import com.mybatisflex.annotation.Id;
import com.mybatisflex.annotation.KeyType;
import com.mybatisflex.annotation.Table;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
/**
 * @author: MoChenLi
 * @description:
 * @createTime: 2024-06-29 17:28
 */
@Data
@NoArgsConstructor
@AllArgsConstructor
@Table("DataBaseConfig")
public class DataBaseConfig {

    @Id(keyType = KeyType.Auto)
    private Integer id;

    private String jdbcUrl;

    private String username;

    private String password;

    private String driverClassName;

    private String connectionName;
}

mapper类

package com.mochenli.shardingshere.mapper;
import com.mochenli.shardingshere.entity.DataBaseConfig;
import com.mybatisflex.core.BaseMapper;
import org.apache.ibatis.annotations.Mapper;
/**
 * @author: MoChenLi
 * @description:
 * @createTime: 2024-06-29 17:31
 */
@Mapper
public interface DataBaseConfigMapper extends BaseMapper<DataBaseConfig> {
}

2-4、初始化ShardingDataSource数据源实现分库分表

分片算法可查看链接

package com.mochenli.shardingshere.config;
import com.mochenli.shardingshere.entity.DataBaseConfig;
import com.mochenli.shardingshere.mapper.DataBaseConfigMapper;
import com.mybatisflex.core.FlexGlobalConfig;
import com.mybatisflex.core.datasource.FlexDataSource;
import com.zaxxer.hikari.HikariDataSource;
import org.apache.shardingsphere.driver.api.ShardingSphereDataSourceFactory;
import org.apache.shardingsphere.infra.config.algorithm.ShardingSphereAlgorithmConfiguration;
import org.apache.shardingsphere.infra.config.mode.ModeConfiguration;
import org.apache.shardingsphere.sharding.api.config.ShardingRuleConfiguration;
import org.apache.shardingsphere.sharding.api.config.rule.ShardingTableRuleConfiguration;
import org.apache.shardingsphere.sharding.api.config.strategy.keygen.KeyGenerateStrategyConfiguration;
import org.apache.shardingsphere.sharding.api.config.strategy.sharding.ShardingStrategyConfiguration;
import org.apache.shardingsphere.sharding.api.config.strategy.sharding.StandardShardingStrategyConfiguration;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import javax.sql.DataSource;
import java.sql.SQLException;
import java.util.*;
/**
 * @author: MoChenLi
 * @description:
 * @createTime: 2024-06-19 13:53
 */
@Configuration
public class ShardingConfig {

     private DataBaseConfigMapper dataBaseConfigMapper;

    public ShardingConfig(DataBaseConfigMapper dataBaseConfigMapper) throws SQLException {
        this.dataBaseConfigMapper = dataBaseConfigMapper;
        FlexDataSource flexDataSource = FlexGlobalConfig.getDefaultConfig()
                .getDataSource();
        flexDataSource.addDataSource("getShardingDataSource",getShardingDataSource());
    }
    /**
     * 配置shardingsphere的内存模式
     * @return
     */
    @Bean
    public ModeConfiguration getModeConfiguration() {
        ModeConfiguration modeConfiguration = new ModeConfiguration("Memory", null, false);
        return modeConfiguration;
    }
    /**
     * 构建ShardingDataSource数据源
     * @return
     * @throws SQLException
     */
    public DataSource getShardingDataSource() throws SQLException {
        //查询数据库的数据连接配置设置到dataSourceMap当中
        Map<String, DataSource> dataSourceMap = new HashMap<>();
        List<DataBaseConfig> dataBaseConfigs = dataBaseConfigMapper.selectAll();
        for (DataBaseConfig dataBaseConfig : dataBaseConfigs) {
            DataSource dataSource = createDataSource(dataBaseConfig);
            dataSourceMap.put(dataBaseConfig.getConnectionName(), dataSource);
        }
        //以下分片配置的规则也可持久化从数据库查询出来进行配置 此处用于演示所需即静态配置
        // 配置分片规则
        ShardingRuleConfiguration shardingRuleConfig = new ShardingRuleConfiguration();
        //算法相关配置
        Map<String, ShardingSphereAlgorithmConfiguration> shardingSphereAlgorithmConfigurations = new HashMap<>();
        Properties properties = new Properties();
        properties.put("algorithm-expression","server-order$->{user_id % 2}");
        ShardingSphereAlgorithmConfiguration shardingSphereAlgorithmConfiguration =  new ShardingSphereAlgorithmConfiguration("INLINE",properties);
        Properties properties1 = new Properties();
        properties1.put("sharding-count","2");
        ShardingSphereAlgorithmConfiguration shardingSphereAlgorithmConfiguration1 =  new ShardingSphereAlgorithmConfiguration("MOD",properties1);
        Properties properties2 = new Properties();
        properties2.put("sharding-count","2");
        ShardingSphereAlgorithmConfiguration shardingSphereAlgorithmConfiguration2 =  new ShardingSphereAlgorithmConfiguration("HASH_MOD",properties2);
        shardingSphereAlgorithmConfigurations.put("alg_inline_userid",shardingSphereAlgorithmConfiguration);
        shardingSphereAlgorithmConfigurations.put("alg_mod",shardingSphereAlgorithmConfiguration1);
        shardingSphereAlgorithmConfigurations.put("alg_hash_mod",shardingSphereAlgorithmConfiguration2);
        shardingRuleConfig.setShardingAlgorithms(shardingSphereAlgorithmConfigurations);
        //分库分表策略配置
        Collection<ShardingTableRuleConfiguration> shardingTableRuleConfigurations = new ArrayList<>();
        //分库策略
        ShardingTableRuleConfiguration shardingTableRuleConfiguration = new ShardingTableRuleConfiguration("t_order","server-order$->{0..1}.t_order$->{0..1}");
        ShardingStrategyConfiguration shardingStrategyConfiguration = new StandardShardingStrategyConfiguration("user_id","alg_mod");
        shardingTableRuleConfiguration.setDatabaseShardingStrategy(shardingStrategyConfiguration);
        //分表策略
        ShardingStrategyConfiguration shardingStrategyConfigurationtable = new StandardShardingStrategyConfiguration("order_no","alg_hash_mod");
        shardingTableRuleConfiguration.setTableShardingStrategy(shardingStrategyConfigurationtable);
        shardingTableRuleConfigurations.add(shardingTableRuleConfiguration);
        shardingRuleConfig.setTables(shardingTableRuleConfigurations);
        //配置主键算法生成策略
        Map<String, ShardingSphereAlgorithmConfiguration> keyGenerators = new HashMap<>();
        ShardingSphereAlgorithmConfiguration shardingSphereAlgorithmConfigurationsk =  new ShardingSphereAlgorithmConfiguration("SNOWFLAKE",null);
        keyGenerators.put("alg_snowflake",shardingSphereAlgorithmConfigurationsk);
        shardingRuleConfig.setKeyGenerators(keyGenerators);
        //分布式id
        KeyGenerateStrategyConfiguration keyGenerateStrategyConfiguration =new KeyGenerateStrategyConfiguration("id","alg_snowflake");
        shardingTableRuleConfiguration.setKeyGenerateStrategy(keyGenerateStrategyConfiguration);
        //属性设置运行sql打印显示
        Properties properties3 = new Properties();
        properties3.put("sql-show",true);
        // 创建ShardingDataSource
        DataSource dataSources = ShardingSphereDataSourceFactory.createDataSource(dataSourceMap, Collections.singleton(shardingRuleConfig),properties3 );
        return dataSources;
    }
    /**
     * 创建数据源连接
     * @param dataBaseConfig
     * @return
     */
    public static DataSource createDataSource(DataBaseConfig dataBaseConfig)  {
        // 创建数据源，这里需要根据实际情况创建，例如使用HikariCP、Druid等连接池
        HikariDataSource dataSource = new HikariDataSource();
        dataSource.setDriverClassName(dataBaseConfig.getDriverClassName());
        dataSource.setJdbcUrl(dataBaseConfig.getJdbcUrl());
        dataSource.setUsername(dataBaseConfig.getUsername());
        dataSource.setPassword(dataBaseConfig.getPassword());
        //不使用连接池
        //DriverManagerDataSource dataSource1 = new DriverManagerDataSource();
        //dataSource1.setDriverClassName(dataBaseConfig.getDriverClassName());
        //dataSource1.setUrl(dataBaseConfig.getJdbcUrl());
        //dataSource1.setUsername(dataBaseConfig.getUsername());
        //dataSource1.setPassword(dataBaseConfig.getPassword());
        return dataSource;
    }
}

2-5、两个数据库连接server-order0和server-order1的表结构如下：分别在两个库当中运行

SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;

-- ----------------------------
-- Table structure for t_order0
-- ----------------------------
DROP TABLE IF EXISTS `t_order0`;
CREATE TABLE `t_order0`  (
  `id` bigint NOT NULL,
  `order_no` varchar(30) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL,
  `user_id` bigint NULL DEFAULT NULL,
  `apythonmount` decimal(10, 2) NULL DEFAULT NULL,
  PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8mb4 COLLATE = utf8mb4_0900_ai_ci ROW_FORMAT = Dynamic;


-- ----------------------------
-- Table structure for t_order1
-- ----------------------------
DROP TABLE IF EXISTS `t_order1`;
CREATE TABLE `t_order1`  (
  `id` bigint NOT NULL,
  `order_no` varchar(30) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL,
  `user_id` bigint NULL DEFAULT NULL,
  `amount` decimal(10, 2) NULL DEFAULT NULL,
  PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8mb4 COLLATE = utf8mb4_0900_ai_ci ROW_FORMAT = Dynamic;

SET FOREIGN_KEY_CHECKS = 1;

2-6、实体这个@Table(“t_order”)是逻辑表名ShardingConfig分库策略时设置的

package com.mochenli.shardingshere.entity;
import com.mybatisflex.annotation.Id;
import com.mybatisflex.annotation.KeyType;
import com.mybatisflex.annotation.Table;
import lombok.Data;
import java.math.BigDecimal;
/**
 * @author: MoChenLi
 * @description:
 * @createTime: 2024-06-18 17:15
 */
@Table("t_order")
@Data
public class Order {
    @Id(keyType = KeyType.Auto)
    private Long id;
    private String orderNo;
    private Long userId;
    private BigDecimal amount;
}

2-7、mapper

package com.mochenli.shardingshere.mapper;
import com.mochenli.shardingshere.entity.Order;
import com.mybatisflex.core.BaseMapper;
import org.apache.ibatis.annotations.Mapper;
/**
 * @author: MoChenLi
 * @description:
 * @createTime: 2024-06-18 17:18
 */
@Mapper
public interface OrderMapper extends BaseMapper<Order> {
}

3、测试

3-1、测试分库分表的新增

package com.mochenli.shardingshere.controller;

import com.mochenli.shardingshere.entity.Order;
import com.mochenli.shardingshere.mapper.OrderMapper;
import com.mybatisflex.core.datasource.DataSourceKey;
import lombok.AllArgsConstructor;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * @author: MoChenLi
 * @description:
 * @createTime: 2024-06-29 18:11
 */
@RestController
@AllArgsConstructor
public class TestController {
   private final   OrderMapper orderMapper;
    /**
     * id是用分布式id雪花算法 所以不填
     * 测试新增   因为前面配置是根据user_id进行分库 分库算法是:取模分片，算法类型：MOD  分片数量是 2
     * 分表算法是根据 order_no 进行分表  分表算法是 哈希取模分片算法，类型：HASH_MOD  分片数量是 2
     */
    @GetMapping("/testAddOrder")
    public String addTOrder(){
        //切换数据源 使用ShardingDataSource数据源
        DataSourceKey.use("getShardingDataSource");
        //进行分库分表插入
        for (int i = 1; i <=60; i++) {
            Order order = new Order();
            order.setUserId(Long.valueOf(i));
            order.setOrderNo("分表算法"+i);
            orderMapper.insert(order);
        }
        return "success";
    }
}

结果如下所示：

MyBatis-Flex+ShardingSphere-JDBC多数据源分库分表实现

server_order0.t_order0

MyBatis-Flex+ShardingSphere-JDBC多数据源分库分表实现

server_order0.t_order1

MyBatis-Flex+ShardingSphere-JDBC多数据源分库分表实现

server_order1.t_order0

MyBatis-Flex+ShardingSphere-JDBC多数据源分库分表实现

server_order1.t_order1

MyBatis-Flex+ShardingSphere-JDBC多数据源分库分表实现

3-2、测试分页查询：

package com.mochenli.shardingshere.controller;

import com.mochenli.shardingshere.entity.Order;
import com.mochenli.shardingshere.mapper.OrderMapper;
import com.mybatisflex.core.datasource.DataSourceKey;
import com.mybatisflex.core.paginate.Page;
import com.mybatisflex.core.query.QueryWrapper;
import lombok.AllArgsConstructor;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * @author: MoChenLi
 * @description:
 * @createTime: 2024-06-29 18:11
 */
@RestController
@AllArgsConstructor
public class TestController {
   privwww.devze.comate final   OrderMapper orderMapper;
    
      /**
     * 测试分页查询
     * @return
     */
    @GetMapping("/testPageOrder")
    public Page<Order> getPage(){
        //切换数据源 使用ShardingDataSource数据源
        DataSourceKey.use("getShardingDataSource");
        //进行分页查询
        Page<Order> page = new Page<>();
        page.setPageNumber(1);
        page.setPageSize(27);
        Page<Order> paginate = orderMapper.paginate(page, new QueryWrapper());
        return paginate;
    

}

结果如下:

MyBatis-Flex+ShardingSphere-JDBC多数据源分库分表实现

3-3、测试事务问题

1、正常情况

package com.mochenli.shardingshere.controller;

import com.mochenli.shardingshere.entity.DataBaseConfig;
import com.mochenli.shardingshere.entity.Order;
import com.mochenli.shardingshere.mapper.DataBaseConfigMapper;
import com.mochenli.shardingshere.mapper.OrderMapper;
import com.mybatisflex.core.datasource.DataSourceKey;
import com.mybatisflex.core.paginate.Page;
import com.mybatisflex.core.query.QueryWrapper;
import lombok.AllArgsConstructor;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * @author: MoChenLi
 * @description:
 * @createTime: 2024-06-29 18:11
 */
@RestController
@AllArgsConstructor
public class TestController {
   private final   OrderMapper orderMapper;
   private  final DataBaseConfigMapper dataBaseConfigMapper;
  
    /**
     * 测试事务问题
     * 正常情况
     */
    @GetMapping("/testTransaction")
    public Map<String,Object> testTransaction(){
        Map<String,Object> map = new HashMap<>();
        List<DataBaseConfig> dataBaseConfigs = dataBaseConfigMapper.selectAll();
        map.put("dataBaseConfigs",dataBaseConfigs);
        DataSourceKey.clear();//清除数据源
        //切换数据源 使用ShardingDataSource数据源
        DataSourceKey.use("getShardingDataSource");
        List<Order> orders = orderMapper.selectAll();
        map.put("orders",orders);
        return map;
    }

}

结果：

MyBatis-Flex+ShardingSphere-JDBC多数据源分库分表实现

2、出错进行事务回滚情况一

package com.mochenli.shardingshere.controller;

import com.mochenli.shardingshere.entity.DataBaseConfig;
import com.mochenli.shardingshere.entity.Order;
import com.mochenli.shardingshere.mapper.DataBaseConfigMapper;
import com.mochenli.shardingshere.mapper.OrderMapper;
import com.mybatisflex.core.datasource.DataSourceKey;
import com.mybatisflex.core.paginate.Page;
import com.mybatisflex.core.query.QueryWrapper;
import lombok.AllArgsConstructor;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * @author: MoChenLi
 * @description:
 * @createTime: 2024-06-29 18:11
 */
@RestController
@AllArgsConstructor
public class TestController {
    private final OrderMapper orderMapper;
    private final DataBaseConfigMapper dataBaseConfigMapper;
    /**
     * 测试事务问题
     * 报错情况一  不分库的数据源报错  回滚
     */
    @GetMapping("/testTransactionError")
    @Transactional
    public void testTransactionError() {
        DataBaseConfig dataBaseConfig = new DataBaseConfig();
        dataBaseConfig.setConnectionName("连接名称");
        dataBaseConfig.setJdbcUrl("连接字符串");
        dataBaseConfig.setUsername("用户名");
        dataBaseConfig.setPassword("密码");
        dataBaseConfig.setDriverClassName("驱动");
        //进行新增
        dataBaseConfigMapper.insert(dataBaseConfig);
        //模拟报错
        int i = 10 / 0;
        DataSourceKey.clear();//清除数据源
        //切换数据源 使用ShardingDataSource数据源
        DataSourceKey.use("getShardingDataSource");
        List<Order> orders = orderMapper.selectAll();
    }

}

MyBatis-Flex+ShardingSphere-JDBC多数据源分库分表实现

MyBatis-Flex+ShardingSphere-JDBC多数据源分库分表实现

3、出错进行事务回滚情况二

package com.mochenli.shardingshere.controller;

import com.mochenli.shardingshere.entity.DataBaseConfig;
import com.mochenli.shardingshere.entity.Order;
import com.mochenli.shardingshere.mapper.DataBaseConfigMapper;
import com.mochenli.shardingshere.mapper.OrderMapper;
import com.mybatisflex.core.datasource.DataSourceKey;
import com.mybatisflex.core.paginate.Page;
import com.mybatisflex.core.query.QueryWrapper;
import androidlombok.AllArgsConsandroidtructor;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * @author: MoChenLi
 * @description:
 * @createTime: 2024-06-29 18:11
 */
@RestController
@AllArgsConstructor
public class TestController {
    private final OrderMapper orderMapper;
    private final DataBaseConfigMapper dataBaseConfigMapper;

    /**
     * 测试事务问题
     * 报错情况二  分库分表的数据源报错  回滚
     */
    @GetMapping("/testTransactionError1")
    @Transactional
    public void testTransactionError1() {
        //切换数据源 使用ShardingDataSource数据源
        DataSourceKey.use("getShardingDataSource");
        for (int i = 1; i <= 5; i++) {
            Order order = new Order();
            //不出错 1%2=1应该在server_order1库当中
            order.setUserId(1L);
           //不出错  "事务回滚测试".hashCode() % 2 = 0 应该在 t_order0表当中;
            order.setOrderNo("事务回滚测试");
            orderMapper.insert(order);
        }
        //模拟报错
        int k = 10 / 0;
        DataSourceKey.clear();//清除数据源
        List<DataBaseConfig> dataBaseConfigs = dataBaseConfigMapper.selectAll();
    }

}

结果回滚了

MyBatis-Flex+ShardingSphere-JDBC多数据源分库分表实现

补充：mybatis-plus不支持多数据源切换，得自己实现，且还得自己进行自定义事务增强

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