引入依赖

<dependency>
    <groupId>org.apache.shardingsphere</groupId>
    <artifactId>sharding-jdbc-spring-boot-starter</artifactId>
    <version>4.0.0-RC1</version>
</dependency>

yml配置文件

spring:
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    druid:
      first:  #数据源1
        driverClassName: com.mysql.jdbc.Driver
        url: ******
        username: ******
        password: YmqMysql123
      second:  #数据源2
        driverClassName: oracle.jdbc.OracleDriver
        url: ******
        username: ******
        password: ******
      third:  #数据源3
        driverClassName: oracle.jdbc.OracleDriver
        url: ******
        username: ******
        password: ******
      fourth:  #数据源4
        driverClassName: oracle.jdbc.OracleDriver
        url: ******
        username: ******
        password: ******
      fifth:  #数据源5
        driverClassName: com.mysql.jdbc.Driver
        url: ******
        username: ******
        password: ******

创建读取数据源配置类

import com.alibaba.druid.pool.DruidDataSource;
import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Configuration;

/**
 * @author wuzhenyong
 * ClassName:DataSourceProperties.java
 * date:2022-06-21 16:12
 * Description:
 */
@Data
@Configuration
@ConfigurationProperties(prefix = "spring.datasource.druid")
public class DataSourceProperties {
    private DruidDataSource first;
    private DruidDataSource second;
    private DruidDataSource third;
    private DruidDataSource fourth;
    private DruidDataSource fifth;

}

数据源名称管理

public interface DataSourceNames {
    String FIRST = "first";
    String SECOND = "second";
    String THIRD = "third";
    String FOURTH = "fourth";
    String FIFTH = "fifth";
}

Sharding数据源配置及动态数据源

package com.cnpc.datasources.sharding;

import java.sql.SQLException;
import java.util.*;

import javax.sql.DataSource;

import com.alibaba.druid.pool.DruidDataSource;
import com.cnpc.datasources.DataSourceNames;
import com.cnpc.datasources.DataSourceProperties;
import com.cnpc.datasources.DynamicDataSource;
import com.cnpc.datasources.DynamicDataSourceConfig;
import lombok.SneakyThrows;
import org.apache.shardingsphere.api.config.sharding.KeyGeneratorConfiguration;
import org.apache.shardingsphere.api.config.sharding.ShardingRuleConfiguration;
import org.apache.shardingsphere.api.config.sharding.TableRuleConfiguration;
import org.apache.shardingsphere.api.config.sharding.strategy.InlineShardingStrategyConfiguration;
import org.apache.shardingsphere.api.config.sharding.strategy.ShardingStrategyConfiguration;
import org.apache.shardingsphere.shardingjdbc.api.ShardingDataSourceFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.core.annotation.Order;
import org.springframework.core.env.Environment;

import com.google.common.collect.Lists;
import com.zaxxer.hikari.HikariDataSource;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import org.springframework.transaction.PlatformTransactionManager;

/**
* sharding 数据源
*
* @author zhaolei
* @date 2020年12月3日
*
*/
@Configuration
@Order(3)
public class ShardingDataSourceConfig {
	String dbNames = DataSourceNames.FIRST;

	@Autowired
	private DataSourceProperties properties;

	@Autowired
	private Environment env;

	public static Map<String, DataSource> dataSourceMap = new HashMap<>();

    @Bean
    @Primary
    public DynamicDataSource dataSource() {
        System.out.println("多数据源初始化......");
        Map<Object, Object> targetDataSources = new HashMap<>(16);
//        targetDataSources.put(DataSourceNames.FIRST, ShardingDataSourceConfig.dataSourceMap.get(DataSourceNames.FIRST));
        targetDataSources.put(DataSourceNames.FIRST, buildDataSource());
        targetDataSources.put(DataSourceNames.SECOND, properties.getSecond());
        targetDataSources.put(DataSourceNames.THIRD, properties.getThird());
        targetDataSources.put(DataSourceNames.FOURTH, properties.getFourth());
        targetDataSources.put(DataSourceNames.FIFTH, properties.getFifth());
        return new DynamicDataSource(buildDataSource(), targetDataSources);
    }

    @SneakyThrows
	private DataSource buildDataSource() {
		dataSourceMap.put(DataSourceNames.FIRST, properties.getFirst());
		// initDataSourceMap();
		String[] split = dbNames.split(",");
		// 具体分库分表策略，按什么规则来分
		ShardingRuleConfiguration conf = new ShardingRuleConfiguration();

		// table rule
		TableRuleConfiguration tableRule = new TableRuleConfiguration("t_wx_push_info", split[0] + ".t_wx_push_info$->{1..8}");
		// key生成规则
		KeyGeneratorConfiguration keyGen = new KeyGeneratorConfiguration("PUSHINFO", "id");
		tableRule.setKeyGeneratorConfig(keyGen);
		// 分表策略
		ShardingStrategyConfiguration tableShardingStrategyConfig = new InlineShardingStrategyConfiguration("id", "t_wx_push_info$->{id % 8 + 1}");
		tableRule.setTableShardingStrategyConfig(tableShardingStrategyConfig);

		// table rule
		TableRuleConfiguration table2Rule = new TableRuleConfiguration("t_wx_push_info_details", split[0] + ".t_wx_push_info_details$->{1..8}");
		// key生成规则
		KeyGeneratorConfiguration key2Gen = new KeyGeneratorConfiguration("PUSHINFODETAIL", "id");
		table2Rule.setKeyGeneratorConfig(key2Gen);
		// 分表策略
		ShardingStrategyConfiguration tableSharding2StrategyConfig = new InlineShardingStrategyConfiguration("info_type", "t_wx_push_info_details$->{info_type % 8 + 1}");
		table2Rule.setTableShardingStrategyConfig(tableSharding2StrategyConfig);

		conf.setTableRuleConfigs(Lists.newArrayList(tableRule, table2Rule));
		Properties props = new Properties();
		props.put("sql.show", true);
		DataSource dataSource = ShardingDataSourceFactory.createDataSource(dataSourceMap, conf, props);
		return dataSource;

	}
}

DynamicDataSource动态数据源

public class DynamicDataSource extends AbstractRoutingDataSource {
    private static final ThreadLocal<String> CONTEXT_HOLDER = new ThreadLocal<>();

    public DynamicDataSource(DataSource defaultTargetDataSource, Map<Object, Object> targetDataSources) {
        super.setDefaultTargetDataSource(defaultTargetDataSource);
        super.setTargetDataSources(targetDataSources);
        super.afterPropertiesSet();
    }

    @Override
    protected Object determineCurrentLookupKey() {
        return getDataSource();
    }

    public static void setDataSource(String dataSource) {
        CONTEXT_HOLDER.set(dataSource);
    }

    public static String getDataSource() {
        return CONTEXT_HOLDER.get();
    }

    public static void clearDataSource() {
        CONTEXT_HOLDER.remove();
    }

}

多数据源注解

@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface DataSource {
    String name() default "";
}

多数据源切面

import com.cnpc.datasources.DataSourceNames;
import com.cnpc.datasources.DynamicDataSource;
import com.cnpc.datasources.annotation.DataSource;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.Ordered;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;

/**
 * 多数据源，切面处理类
 * @author YangMQ
 */
@Aspect
@Component
public class DataSourceAspect implements Ordered {
    protected Logger logger = LoggerFactory.getLogger(getClass());

    @Pointcut("@annotation(com.cnpc.datasources.annotation.DataSource)")
    public void dataSourcePointCut() {

    }

    @Around("dataSourcePointCut()")
    public Object around(ProceedingJoinPoint point) throws Throwable {
        MethodSignature signature = (MethodSignature) point.getSignature();
        Method method = signature.getMethod();

        DataSource ds = method.getAnnotation(DataSource.class);
        if (ds == null) {
            DynamicDataSource.setDataSource(DataSourceNames.FIRST);
            logger.debug("set datasource is " + DataSourceNames.FIRST);
        } else {
            DynamicDataSource.setDataSource(ds.name());
            logger.debug("set datasource is " + ds.name());
        }

        try {
            return point.proceed();
        } finally {
            DynamicDataSource.clearDataSource();
            logger.debug("clean datasource");
        }
    }

    @Override
    public int getOrder() {
        return 1;
    }
}

以上就可以进行动态数据源切换及分库分表的使用了哦