Springboot 实现mybatis+jpa+动态数据源

        本文介绍SpringBoot 框架中实现mybatis和jpa 同时实现多数据源。Springboot 版本1.4.0.Release 因为Springboot版本不到2.0 ，所以还是遇到了一些小挫折，不过最终解决。

1. yml文件配置多数据源

2. 动态数据源基础类 DynamicRoutingDataSource.java

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;

/**
 * 动态数据源设置
 *
 * @date 2019-11-05
 */
public class DynamicRoutingDataSource extends AbstractRoutingDataSource {

    private final Logger logger = LoggerFactory.getLogger(getClass());

    /**
     * Set dynamic DataSource to Application Context
     *
     * @return
     */
    @Override
    protected Object determineCurrentLookupKey() {
        logger.debug("Current DataSource is [{}]", 
        DynamicDataSourceContextHolder.getDataSourceKey());
        return DynamicDataSourceContextHolder.getDataSourceKey();
    }
}

3.动态数据源上下文  DynamicDataSourceContextHolder.java

package com.hi.base.config.datasource;

import com.alibaba.ttl.TransmittableThreadLocal;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.ArrayList;
import java.util.List;

/**
 * 动态数据源上下文配置 DynamicDataSourceContextHolder.java
 *
 * @author lida
 * @date 2019-11-05
 */
public class DynamicDataSourceContextHolder {

    private static final Logger logger = LoggerFactory.getLogger(DynamicDataSourceContextHolder.class);

    /**
     * Maintain variable for every thread, to avoid effect other thread
     */
    private static final ThreadLocal CONTEXT_HOLDER = new TransmittableThreadLocal<>();

    /**
     * All DataSource List
     */
    public static List