Springboot配置多数据源

Springboot配置多数据源

业务中会存在同时操作多个数据库的情况，这种情况下可以创建配置类，添加数据源。大致步骤为：

• mapper分包，将操作对象为同一数据库的mapper放在同一个包内
• 修改配置文件的数据源
• 添加配置类

1.mapper分包

2.修改配置源

连接多个数据库时，url要更改为jdbc-url，否则会报错(这里改成jdbcUrl也可)

spring.datasource.datasource1.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.datasource2.type=com.alibaba.druid.pool.DruidDataSource
#datasource1
spring.datasource.datasource1.jdbcUrl=jdbc:mysql://localhost:3306/bobospace?useSSL=false&allowMultiQueries=true
spring.datasource.datasource1.username=root
spring.datasource.datasource1.password=root
# datasource2
spring.datasource.datasource2.jdbcUrl=jdbc:mysql://localhost:3306/space?useSSL=false&allowMultiQueries=true
spring.datasource.datasource2.username=root
spring.datasource.datasource2.password=root

3.添加配置类，返回构建的数据源

@Configuration
public class DataSourceConfig {

    @Bean("dataSource1")
    @ConfigurationProperties("spring.datasource.datasource1")
    public DataSource dataSource1() {
        return DataSourceBuilder.create().build();
    }

    @Bean("dataSource2")
    @ConfigurationProperties("spring.datasource.datasource2")
    public DataSource dataSource2() {
        return DataSourceBuilder.create().build();
    }
}

4.添加配置类，返回不同数据库对应操作对象SqlSessionFactory

• 单数据库下启动类如果有MapperScan要去掉
• 有xml配置的mapper也要重新在配置类中进行路径定位factoryBean.setMapperLocations

	@Configuration
@MapperScan(basePackages = "com.example.bobosapce.Dao.Mapper.Source1", sqlSessionFactoryRef = "sqlSessionFactory1")
public class MybatisConfig1 {

    @Autowired
    @Qualifier("dataSource1")
    private DataSource dataSource1;

    @Bean("sqlSessionFactory1")
    public SqlSessionFactory sqlSessionFactory1() throws Exception {
        SqlSessionFactoryBean factoryBean = new SqlSessionFactoryBean();
        factoryBean.setDataSource(dataSource1);
        factoryBean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:/mapper/source1/*.xml"));
        // 设置 MyBatis 配置
        // ...
        return factoryBean.getObject();
    }

}

@Configuration
@MapperScan(basePackages = "com.example.bobosapce.Dao.Mapper.Source2", sqlSessionFactoryRef = "sqlSessionFactory2")
public class MybatisConfig2 {

    @Autowired
    @Qualifier("dataSource2")
    private DataSource dataSource2;

    @Bean("sqlSessionFactory2")
    public SqlSessionFactory sqlSessionFactory2() throws Exception {
        SqlSessionFactoryBean factoryBean = new SqlSessionFactoryBean();
        factoryBean.setDataSource(dataSource2);
        // 设置 MyBatis 配置
        // ...
        return factoryBean.getObject();
    }

}

关于SqlSessionFactory

SqlSessionFactoryBuilder 与 SqlSessionFactoryBean的区别:
mybatis中使用SqlSessionFactoryBuilder获得SqlSessionFactory 的实例,通过SqlSessionFactory 的实例可以获得操作数据的SqlSession实例，通过这个实例对数据库进行操作;
mybatis-spring整合时使用SqlSessionFactoryBean替代SqlSessionFactoryBuilder来创建session工厂.