springboot配置多数据源

依赖 pom.xml

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.1</version>
        </dependency>
        
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        
        <!-- oracle驱动 -->
        <!-- 可能在maven仓库中找不到，需要下载jar包，加载进本地仓库    -->
        <dependency>
            <groupId>com.oracle</groupId>
            <artifactId>ojdbc6</artifactId>
            <version>6.0</version>
        </dependency>
        
        <!-- mysql驱动 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

        <!-- druid数据源驱动 -->
        <dependency>
           <groupId>com.alibaba</groupId>
           <artifactId>druid-spring-boot-starter</artifactId>
           <version>1.1.6</version>
        </dependency>

配置文件application.yml

server:
  context-path: /web

spring:
  datasource:
    druid:
      # 数据库访问配置, 使用druid数据源
      # 数据源1 mysql
      mysql:
        type: com.alibaba.druid.pool.DruidDataSource
        driver-class-name: com.mysql.jdbc.Driver
        url: jdbc:mysql://10.0.0.3:3306/test?useUnicode=true&characterEncoding=UTF-8&rewriteBatchedStatements=true&autoReconnect=true&failOverReadOnly=false&zeroDateTimeBehavior=convertToNull
        username: root
        password: root
      # 数据源2 oracle
      oracle: 
        type: com.alibaba.druid.pool.DruidDataSource
        driver-class-name: oracle.jdbc.driver.OracleDriver
        url: jdbc:oracle:thin:@localhost:1521:ORCL
        username: c##abc
        password: 123456
        
      # 连接池配置
      initial-size: 5
      min-idle: 5
      max-active: 20
      # 连接等待超时时间
      max-wait: 30000
      # 配置检测可以关闭的空闲连接间隔时间
      time-between-eviction-runs-millis: 60000
      # 配置连接在池中的最小生存时间
      min-evictable-idle-time-millis: 300000
      validation-query: select '1' from dual
      test-while-idle: true
      test-on-borrow: false
      test-on-return: false
      # 打开PSCache，并且指定每个连接上PSCache的大小
      pool-prepared-statements: true
      max-open-prepared-statements: 20
      max-pool-prepared-statement-per-connection-size: 20
      # 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
      filters: stat,wall
      # Spring监控AOP切入点，如x.y.z.service.*,配置多个英文逗号分隔
      aop-patterns: com.springboot.servie.*
      
    
      # WebStatFilter配置
      web-stat-filter:
        enabled: true
        # 添加过滤规则
        url-pattern: /*
        # 忽略过滤的格式
        exclusions: '*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*'
      
      # StatViewServlet配置 
      stat-view-servlet:
        enabled: true
        # 访问路径为/druid时，跳转到StatViewServlet
        url-pattern: /druid/*
        # 是否能够重置数据
        reset-enable: false
        # 需要账号密码才能访问控制台
        login-username: druid
        login-password: druid123
        # IP白名单
        # allow: 127.0.0.1
        #　IP黑名单（共同存在时，deny优先于allow）
        # deny: 192.168.1.218
      
      # 配置StatFilter
      filter: 
        stat: 
          log-slow-sql: true

配置多数据源

mysql:

MysqlDatasourceConfig.class

Configuration
// 指定扫描的mapper包
@MapperScan(basePackages = "com.springboot.mysqlDao", sqlSessionFactoryRef = "mysqlSqlSessionFactory")
public class MysqlDatasourceConfig {


    // mybatis mapper扫描路径
    private static final String MAPPER_LOCATION = "classpath:mapper/mysql/*.xml";

    @Primary
    @Bean(name = "mysqldatasource")
    // 使用yml里的配置配置数据源builder
    @ConfigurationProperties("spring.datasource.druid.mysql")
    public DataSource mysqlDataSource() {
        return DruidDataSourceBuilder.create().build();
    }

    @Bean(name = "mysqlTransactionManager")
    @Primary
    public DataSourceTransactionManager mysqlTransactionManager() {
        return new DataSourceTransactionManager(mysqlDataSource());
    }

    @Bean(name = "mysqlSqlSessionFactory")
    @Primary
    public SqlSessionFactory mysqlSqlSessionFactory(@Qualifier("mysqldatasource") DataSource dataSource)
            throws Exception {
        final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();
        sessionFactory.setDataSource(dataSource);
        //如果不使用xml的方式配置mapper，则可以省去下面这行mapper location的配置。
        sessionFactory.setMapperLocations(
                new PathMatchingResourcePatternResolver().getResources(MysqlDatasourceConfig.MAPPER_LOCATION));
        return sessionFactory.getObject();
    }
}

oracle：

OracleDatasourceConfig.class

@Configuration
@MapperScan(basePackages = "com.springboot.oracleDao",
    sqlSessionFactoryRef = "oracleSqlSessionFactory")
public class OracleDatasourceConfig {
    

    // mybatis mapper扫描路径
    static final String MAPPER_LOCATION = "classpath:mapper/oracle/*.xml";
    
    @Bean(name = "oracledatasource")
    @ConfigurationProperties("spring.datasource.druid.oracle")
    public DataSource oracleDataSource() {
        return DruidDataSourceBuilder.create().build();
    }
    
    @Bean(name = "oracleTransactionManager")
    public DataSourceTransactionManager oracleTransactionManager() {
        return new DataSourceTransactionManager(oracleDataSource());
    }
 
    @Bean(name = "oracleSqlSessionFactory")
    public SqlSessionFactory oracleSqlSessionFactory(@Qualifier("oracledatasource") DataSource dataSource) throws Exception {
        final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();
        sessionFactory.setDataSource(dataSource);
        //如果不使用xml的方式配置mapper，则可以省去下面这行mapper location的配置。
        sessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver()
                .getResources("classpath:mapper/oracle/*.xml"));
        return sessionFactory.getObject();
    }
}

mapper文件

mysql：MysqlStudentMapper.class

package com.springboot.mysqlDao;
@Mapper
public interface MysqlStudentMapper {
   List<Map<String, Object>> getAllStudents();
}

oracle: OracleStudentMapper.class

package com.springboot.oracleDao;
@Mapper
public interface OracleStudentMapper {
   List<Map<String, Object>> getAllStudents();
}

service调用:

@Service
public class StudentServiceImp implements StudentService{
    @Autowired
    private OracleStudentMapper oracleStudentMapper;
    @Autowired
    private MysqlStudentMapper mysqlStudentMapper;
    
    @Override
    public List<Map<String, Object>> getAllStudentsFromOralce() {
        return this.oracleStudentMapper.getAllStudents();
    }

    @Override
    public List<Map<String, Object>> getAllStudentsFromMysql() {
        return this.mysqlStudentMapper.getAllStudents();
    }
}