SpingBoot整合多数据源连接

1、多数据源连接的两种方式：分包||注解；

分包：通过包名指定连接那个数据源；

application.properties配置

###datasource1
spring.datasource.test1.driver-class-name = com.mysql.jdbc.Driver
spring.datasource.test1.jdbc-url = jdbc:mysql://localhost:3306/test01?useUnicode=true&characterEncoding=utf-8
spring.datasource.test1.username = root
spring.datasource.test1.password = root
###datasource2
spring.datasource.test2.driver-class-name = com.mysql.jdbc.Driver
spring.datasource.test2.jdbc-url = jdbc:mysql://localhost:3306/test02?useUnicode=true&characterEncoding=utf-8
spring.datasource.test2.username = root
spring.datasource.test2.password = root

配置文件中新增两个数据源

//DataSource01
@Configuration // 注册到springboot容器中
@MapperScan(basePackages = "com.itmayiedu.test01", sqlSessionFactoryRef = "test1SqlSessionFactory")
public class DataSource1Config {

    /**
     * @methodDesc: 功能描述:(配置test1数据库)*/
    @Bean(name = "test1DataSource")
    @ConfigurationProperties(prefix = "spring.datasource.test1")
    @Primary
    public DataSource testDataSource() {
        return DataSourceBuilder.create().build();
    }

    /**
     * @methodDesc: 功能描述:(test1 sql会话工厂)*/
    @Bean(name = "test1SqlSessionFactory")
    @Primary
    public SqlSessionFactory testSqlSessionFactory(@Qualifier("test1DataSource") DataSource dataSource)
            throws Exception {
        SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
        bean.setDataSource(dataSource);
        // bean.setMapperLocations(
        // new
        // PathMatchingResourcePatternResolver().getResources("classpath:mybatis/mapper/test1/*.xml"));
        return bean.getObject();
    }

    /**
     * @methodDesc: 功能描述:(test1 事物管理)*/
    @Bean(name = "test1TransactionManager")
    @Primary
    public DataSourceTransactionManager testTransactionManager(@Qualifier("test1DataSource") DataSource dataSource) {
        return new DataSourceTransactionManager(dataSource);
    }

    @Bean(name = "test1SqlSessionTemplate")
    @Primary
    public SqlSessionTemplate testSqlSessionTemplate(
            @Qualifier("test1SqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
        return new SqlSessionTemplate(sqlSessionFactory);
    }

}


//DataSource2
@Configuration // 注册到springboot容器中
@MapperScan(basePackages = "com.itmayiedu.test02", sqlSessionFactoryRef = "test2SqlSessionFactory")
public class DataSource2Config {

    /**
     * @methodDesc: 功能描述:(配置test2数据库)*/
    @Bean(name = "test2DataSource")
    @ConfigurationProperties(prefix = "spring.datasource.test2")
    public DataSource testDataSource() {
        return DataSourceBuilder.create().build();
    }

    /**
     * 
     * @methodDesc: 功能描述:(test2 sql会话工厂)*/
    @Bean(name = "test2SqlSessionFactory")
    public SqlSessionFactory testSqlSessionFactory(@Qualifier("test2DataSource") DataSource dataSource)
            throws Exception {
        SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
        bean.setDataSource(dataSource);
        // bean.setMapperLocations(
        // new
        // PathMatchingResourcePatternResolver().getResources("classpath:mybatis/mapper/test2/*.xml"));
        return bean.getObject();
    }

    /**
     * @methodDesc: 功能描述:(test2 事物管理)*/
    @Bean(name = "test2TransactionManager")
    public DataSourceTransactionManager testTransactionManager(@Qualifier("test2DataSource") DataSource dataSource) {
        return new DataSourceTransactionManager(dataSource);
    }

    @Bean(name = "test2SqlSessionTemplate")
    public SqlSessionTemplate testSqlSessionTemplate(
            @Qualifier("test2SqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
        return new SqlSessionTemplate(sqlSessionFactory);
    }

}

多数源事务注意：

在多数据源的情况下，使用@Transactional注解时，应该指定事务管理者

Springboot1.5的时候 没有默认指向数据源 会报错

Springboot2.0的时候 不报错

@Transactional(transactionManager = "test2TransactionManager")

注解原理：通过AOP技术拦截，手写注解，当传递的参数是DataSource1则获取DataSource1的连接；同理其他数据源；【比较麻烦，当工程较大时，方法较多使用的注解也多，容易忘掉；推荐分包方式】