springboot 集成 mybaits 多数据源

本文主要是介绍springboot 集成 mybaits 多数据源，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

application.yml中数据源配置：

#数据库连接天气数据
spring:
datasource:
keshangjdbc:
url: jdbc:oracle:thin:@//IP:1565/ods
username:
password:
# driver-class-name: oracle.jdbc.driver.OracleDriver
#数据库连接客商数据
weatherjdbc:
url: jdbc:oracle:thin:@//IP:1565/ods
username:
password:
# driver-class-name: oracle.jdbc.driver.OracleDriver

对每中链接写一个配置类，主要是通过aop的方式链接注入到SqlSessionTemplate中，

客商的配置类如下：

package com.neusoft.interf.dataSources;

import javax.sql.DataSource;

import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.SqlSessionTemplate;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Qualifier;
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 org.springframework.context.annotation.Primary;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;

import com.alibaba.druid.pool.DruidDataSource;

/**
* @author
* @Time：2018年12月19日上午11:08:35
* @version 1.0
*/
@Configuration
@MapperScan(basePackages = "com.neusoft.interf.mapper.keShang", sqlSessionTemplateRef = "keShangSqlSessionTemplate") //代表扫描的dao层接口，在dao层接口处理前注入数据库连接
public class keShangDataSource {
@Bean(name = "keShangData")
@ConfigurationProperties(prefix = "spring.datasource.keshangjdbc") // application.properteis中对应属性的前缀

//这里特别注意的是application.properteis中对应属性一定要和DruidDataSource的属性字段一直
   @Primary
   public DataSource keShangData() {
       return new DruidDataSource();
   }

   @Bean(name = "keShangSqlSessionFactory")
   @Primary
   public SqlSessionFactory keShangSqlSessionFactory(@Qualifier("keShangData") DataSource dataSource) throws Exception {
   SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
   bean.setDataSource(dataSource);

//工程上默认使用的是Mybatis的DefaultVFS进行扫描，但是在springboot的环境下，Mybatis的DefaultVFS这个扫包会出现问

//题，所以只能修改VFS，为了清晰可见，

VFS.addImplClass(SpringBootVFS.class);//手动触发扫描
   bean.setTypeAliasesPackage("com.neusoft.interf.entity");//对应的实体类文件夹
   bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:mapper/keShang/*.xml"));//对应的xml文件夹
   return bean.getObject();
   }

   @Bean(name = "keShangTransactionManager")
   @Primary
   public DataSourceTransactionManager keShangTransactionManager(@Qualifier("keShangData") DataSource dataSource) {
   return new DataSourceTransactionManager(dataSource);
   }

   @Bean(name = "keShangSqlSessionTemplate")
   @Primary
   public SqlSessionTemplate keShangSqlSessionTemplate(@Qualifier("keShangSqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
   return new SqlSessionTemplate(sqlSessionFactory);
   }

}
天气的配置类如下：

package com.neusoft.interf.dataSources;

import javax.sql.DataSource;

import com.alibaba.druid.pool.DruidDataSource;

/**
* @author
* @Time：2018年12月19日上午11:08:35
* @version 1.0
*/
@Configuration
@MapperScan(basePackages = "com.neusoft.interf.mapper.weather", sqlSessionTemplateRef = "weatherSqlSessionTemplate")
public class weatherDataSource {
   @Bean(name = "weatherData")
   @ConfigurationProperties(prefix = "spring.datasource.weatherjdbc") // application.properteis中对应属性的前缀
   public DataSource weatherData() {
       return new DruidDataSource();
   // return DataSourceBuilder.create().build();
   }

   @Bean(name = "weatherSqlSessionFactory")
   public SqlSessionFactory weatherSqlSessionFactory(@Qualifier("weatherData") DataSource dataSource) throws Exception {
   SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
   bean.setDataSource(dataSource);

//工程上默认使用的是Mybatis的DefaultVFS进行扫描，但是在springboot的环境下，Mybatis的DefaultVFS这个扫包会出现问

//题，所以只能修改VFS，为了清晰可见，

VFS.addImplClass(SpringBootVFS.class);//手动触发扫描

   bean.setTypeAliasesPackage("com.neusoft.interf.entity");
   bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:mapper/weather/*.xml"));
   return bean.getObject();
   }

   @Bean(name = "weatherTransactionManager")
   public DataSourceTransactionManager weatherTransactionManager(@Qualifier("weatherData") DataSource dataSource) {
   return new DataSourceTransactionManager(dataSource);
   }

   @Bean(name = "weatherSqlSessionTemplate")
   public SqlSessionTemplate weatherSqlSessionTemplate(@Qualifier("weatherSqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
   return new SqlSessionTemplate(sqlSessionFactory);
   }

}
如果有多个数据源，配置类中的@Primary只能写在其中一个，否则会报错。

此处有一个技巧：

静态工具类中如果调用，springboot中bean，通过@Autowired引入bean，@PostConstruct注解方法中，把此bean

赋给静态变量

@Autowired
   private DictService dictService;
   @Autowired
   private static DictService dictService1;

   @PostConstruct
   public void init() {
       dictService1 = dictService;
   }

public static List<Dict> getDictList(String type) {

       Map<String, Object> dictMap = Maps.newHashMap();
       List<Dict> dicts = null;
       try {

           dicts = dictService1.findAllList();
       } catch (Exception e) {
           e.printStackTrace();
       }
       for (Dict dict : dicts) {
           List<Dict> dictList = (List<Dict>) dictMap.get(dict.getType());
           if (dictList != null) {
               dictList.add(dict);
           } else {
               dictMap.put(dict.getType(), Lists.newArrayList(dict));
           }
       }
       List<Dict> dictList = (List<Dict>) dictMap.get(type);
       if (dictList == null) {
           dictList = Lists.newArrayList();
       }
       return dictList;
   }