Springboot+mybatis+druid 配置多数据源

application.yml配置文件

#durid数据库连接池设置
spring:
  profiles:
    ##此处引入配置其他数据源配置文件
    include: dev-datasource
  aop:
    proxy-target-class: true
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    driver-class-name: com.mysql.jdbc.Driver
    jdbc-url: jdbc:mysql://127.0.0.1:3306/primarydatasource?useUnicode=true&characterEncoding=utf-8&useSSL=false
    username: root
    password: 123456
    # 下面为连接池的补充设置，应用到上面所有数据源中
    # 初始化大小，最小，最大
    initialSize: 5
    minIdle: 5
    maxActive: 15
    # 配置获取连接等待超时的时间
    maxWait: 60000
    # 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒
    timeBetweenEvictionRunsMillis: 60000
    minEvictableIdleTimeMillis: 300000
    validationQuery: SELECT 1 FROM DUAL
    testWhileIdle: true
    testOnBorrow: false
    testOnReturn: false
    # 打开PSCache，并且指定每个连接上PSCache的大小
    poolPreparedStatements: true
    # 配置监控统计拦截的filters，去掉后监控界面sql无法统计，'wall'用于防火墙
    maxPoolPreparedStatementPerConnectionSize: 20
    filters: stat,wall,log4j2
    # 通过connectProperties属性来打开mergeSql功能；慢SQL记录
    connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000
    # 合并多个DruidDataSource的监控数据
    useGlobalDataSourceStat: true
    druid:
      remove-abandoned: true
      remove-abandoned-timeout: 180
      log-abandoned: true

application-dev-datasource.yml配置文件 (个人习惯单独写了个yml，再增加数据源可以在这里配置)

## 第二个数据源
spring:
  datasource2:
    type: com.alibaba.druid.pool.DruidDataSource
    driver-class-name: com.mysql.jdbc.Driver
    jdbc-url: jdbc:mysql://127.0.0.1:3306/seconddatasource?useUnicode=true&characterEncoding=utf-8&useSSL=false
    username: root
    password: 123456

主数据源配置代码

import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.SqlSessionTemplate;
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.jdbc.datasource.DataSourceTransactionManager;
import tk.mybatis.spring.annotation.MapperScan;

import javax.sql.DataSource;

@Primary
@Configuration
@MapperScan(basePackages = "com.btwl.primary.mapper" , sqlSessionFactoryRef = "primarySqlSessionFactory")
public class PrimaryDataSource {

    @Bean(name = "DataSource_primary")
    @Primary
    @ConfigurationProperties(prefix = "spring.datasource")
    public DataSource primaryDataSource(){
        return DataSourceBuilder.create().build();
    }

    @Bean(name = "primarySqlSessionFactory")
    @Primary
    public SqlSessionFactory primarySqlSessionFactory(@Qualifier("DataSource_primary") DataSource dataSource)
            throws Exception{
        SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
        bean.setDataSource(dataSource);
        return bean.getObject();
    }

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

    @Bean(name = "primarySqlSessionTemplate")
    @Primary
    public SqlSessionTemplate primarySqlSessionTemplate(@Qualifier("primarySqlSessionFactory") SqlSessionFactory sqlSessionFactory){
        return new SqlSessionTemplate(sqlSessionFactory);
    }
}

第二个数据源配置代码

import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.SqlSessionTemplate;
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.jdbc.datasource.DataSourceTransactionManager;
import tk.mybatis.spring.annotation.MapperScan;

import javax.sql.DataSource;

@Configuration
@MapperScan(basePackages = "com.btwl.second.mapper" , sqlSessionFactoryRef = "secondSqlSessionFactory")
public class SecondDataSource {

    @Bean(name = "DataSource_second")
    @ConfigurationProperties(prefix = "spring.datasource1")
    public DataSource secondDataSource(){
        return DataSourceBuilder.create().build();
    }

    @Bean(name = "secondSqlSessionFactory")
    public SqlSessionFactory secondSqlSessionFactory(@Qualifier("DataSource_second") DataSource dataSource)
            throws Exception{
        SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
        bean.setDataSource(dataSource);
        return bean.getObject();
    }

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

    @Bean(name = "secondSqlSessionTemplate")
    public SqlSessionTemplate secondSqlSessionTemplate(@Qualifier("secondSqlSessionFactory") SqlSessionFactory sqlSessionFactory){
        return new SqlSessionTemplate(sqlSessionFactory);
    }
}

@Primary：指定为默认数据源，没有该注解会报错，系统找不到默认数据源

@MapperScan：扫描指定包的mapper作为对应数据源，建议每个数据源都用不同的包区分

@Qualifier：与@Autowired类似，用作区分如果存在多个实现类要指定要注入哪个 参数为指定Bean的name

spring-database-jdbc-url 不要写成 spring-database-url 会报错 exception : jdbcUrl is required with driverClassName，(嗯，不知道为啥

业务逻辑代码就不放了跟其他的没什么区别，再添加数据源的话就按以上配置再加一个就好了，