shardingjdbc增加动态数据源(用于解决其不支持的SQL等)

1.配置文件

spring: 
    #动态数据源引入
    dynamic:
      strict: true
      datasource:
        ds:
          driver-class-name: com.mysql.cj.jdbc.Driver
          type: com.alibaba.druid.pool.DruidDataSource
          url: ${secret.datasource.url}
          username: ${secret.datasource.username}
          password: ${secret.datasource.password}

2. 动态数据源JAR，小编这里用的3.5.1，根据MP版本保持一致

       
                com.baomidou
                dynamic-datasource-spring-boot-starter
                ${mybatisplus.version}
            

3. 配置类

package com.haicloud.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.springframework.beans.factory.annotation.Autowired;
import org.springframework.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;

@Configuration
@AutoConfigureBefore({DynamicDataSourceAutoConfiguration.class, SpringBootConfiguration.class})

public class DataSourceConfiguration {
    /**
     * 分表数据源名称
     */
    public static final String SHARDING_DATA_SOURCE_NAME = "master";
    /**
     * 动态数据源配置项
     */
    @Autowired
    private DynamicDataSourceProperties dynamicDataSourceProperties;
    
    @Lazy
    @Resource
    DataSource shardingDataSource;

    /**
     * 将shardingDataSource放到了多数据源（dataSourceMap）中
     * 注意有个版本的bug，3.1.1版本 不会进入loadDataSources 方法，这样就一直造成数据源注册失败
     */
    @Bean
    public DynamicDataSourceProvider dynamicDataSourceProvider() {
        Map datasourceMap = dynamicDataSourceProperties.getDatasource();
        return new AbstractDataSourceProvider() {
            @Override
            public Map loadDataSources() {
                Map dataSourceMap = createDataSourceMap(datasourceMap);
                // 将 shardingjdbc 管理的数据源也交给动态数据源管理
                dataSourceMap.put(SHARDING_DATA_SOURCE_NAME, shardingDataSource);
                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
     *
     * @return
     */
    @Primary
    @Bean
    public DataSource dataSource(DynamicDataSourceProvider dynamicDataSourceProvider) {
        DynamicRoutingDataSource dataSource = new DynamicRoutingDataSource();
        dataSource.setPrimary(dynamicDataSourceProperties.getPrimary());
        dataSource.setStrict(dynamicDataSourceProperties.getStrict());
        dataSource.setStrategy(dynamicDataSourceProperties.getStrategy());
//        dataSource.setProvider(dynamicDataSourceProvider);
        dataSource.setP6spy(dynamicDataSourceProperties.getP6spy());
        dataSource.setSeata(dynamicDataSourceProperties.getSeata());
        return dataSource;
    }
}

4.使用方法：

使用方法：
Mapper、service、controller使用的class或者接口上贴指定数据源
    @DS("ds")