Mybatis反射工具类

ObjectFactory：构造对象

Reflector：缓存类的方法

BeanWrapper（ObjectWrapper）：包装对象

可以更新属性

MetaObject

Mybatis配置多数据源

@MapperScan(sqlSessionFactoryRef = "sqlSessionFactoryOrder", basePackages = {"jiagoubaiduren.mapper.order"})
@Configuration
public class OrderMybatisAutoConfiguration {
    private static final ResourcePatternResolver resourceResolver = new PathMatchingResourcePatternResolver();
    private final String[] MAPPER_XML_PATH = new String[] {"classpath*:ordermapper/*.xml"};
    @Bean(name = "dataSourceOrder")
    @Primary
    @ConfigurationProperties("spring.datasource.order")
    public DataSource dataSourceOrder(){
        return DruidDataSourceBuilder.create().build();
    }
    @Bean(name = "sqlSessionFactoryOrder")
    @Primary
    public SqlSessionFactory sqlSessionFactoryOrder() throws Exception {
        SqlSessionFactoryBean factory = new SqlSessionFactoryBean();
        factory.setDataSource(dataSourceOrder());
        factory.setVfs(SpringBootVFS.class);
        factory.setMapperLocations(resolveMapperLocations());
        return factory.getObject();
    }
    @Bean(name = "sqlSessionTemplateOrder")
    @Primary
    public SqlSessionTemplate sqlSessionTemplateOrder() throws Exception {
        return new SqlSessionTemplate(sqlSessionFactoryOrder());
    }
    public Resource[] resolveMapperLocations() {
        return Stream.of(Optional.ofNullable(MAPPER_XML_PATH).orElse(new String[0]))
            .flatMap(location -> Stream.of(getResources(location))).toArray(Resource[]::new);
    }
    private Resource[] getResources(String location) {
        try {
            return resourceResolver.getResources(location);
        } catch (IOException e) {
            return new Resource[0];
        }
    }
}