application.properties

#数据库配置
#数据源类型
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource

#我用的是springBoot 2.1 不需要配置驱动，配置驱动的话反而会出现警告
#spring.datasource.url=jdbc:mysql://192.168.238.130:3306/dev?useUniode=true&characterEncoding=utf-8
#spring.datasource.username=root
#spring.datasource.password=123

#把前缀替换成自定义的，后缀不能变
#在方法中根据特定的前缀获取数据源连接信息
data1.url=jdbc:mysql://192.168.238.130:3306/dev?useUniode=true&characterEncoding=utf-8
data1.username=root
data1.password=123

data2.url=jdbc:mysql://192.168.238.130:3306/dev_1?useUniode=true&characterEncoding=utf-8
data2.username=root
data2.password=123

DataBaseConfig

import javax.sql.DataSource;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.beans.factory.annotation.Value;
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;


@Configuration
@MapperScan(basePackages={"com.sc.myboot.dao"},sqlSessionFactoryRef = "MySqlSessionFactory1")
public class DataBaseConfig {
    
    @Value("${spring.datasource.type}")
    private Class<? extends DataSource> dataSourceType;
    
    
    @Bean(name = "MyDataSource1")
    @ConfigurationProperties(prefix = "data2")
    public DataSource getDataSource(){
        return DataSourceBuilder.create().type(dataSourceType).build();
    }
    
    
    @Bean(name = "MySqlSessionFactory1")
    public SqlSessionFactory masterSqlSessionFactory(@Qualifier("MyDataSource1") DataSource masterDataSource)
            throws Exception {
        final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();
        sessionFactory.setDataSource(masterDataSource);
        return sessionFactory.getObject();
    }

}

我的配置方法比较简单，即按包分离，在制定的包范围内，注入指定的SqlSessionFactory

图解