1   @Override
 2   public Set<BeanDefinitionHolder> doScan(String... basePackages) {
 3     Set<BeanDefinitionHolder> beanDefinitions = super.doScan(basePackages);
 4 
 5     if (beanDefinitions.isEmpty()) {
 6       logger.warn("No MyBatis mapper was found in '" + Arrays.toString(basePackages) + "' package. Please check your configuration.");
 
 7     } else {
 8       for (BeanDefinitionHolder holder : beanDefinitions) {
 9         GenericBeanDefinition definition = (GenericBeanDefinition) holder.getBeanDefinition();
10 
11         if (logger.isDebugEnabled()) {
12           logger.debug("Creating MapperFactoryBean with name '" + holder.getBeanName() 
 
13               + "' and '" + definition.getBeanClassName() + "' mapperInterface");
14         }
15 
16         // the mapper interface is the original class of the bean
17         // but, the actual class of the bean is MapperFactoryBean
18         //把介面的型別設定進去
19         definition.getPropertyValues().add("mapperInterface", definition.getBeanClassName());
 
20         //設定Bean的真實型別MapperFactoryBean 
21         definition.setBeanClass(MapperFactoryBean.class);
22         //是否把Mapper介面加入到Mybatis的Config當中去
23         definition.getPropertyValues().add("addToConfig", this.addToConfig);
24 
25         boolean explicitFactoryUsed = false;
26         //如果sqlSessionFactoryBeanName的名字不為空 則在Spring容器中查詢
27         //適合多資料來源
28         if (StringUtils.hasText(this.sqlSessionFactoryBeanName)) {
29           definition.getPropertyValues().add("sqlSessionFactory", new RuntimeBeanReference(this.sqlSessionFactoryBeanName));
30           explicitFactoryUsed = true;
31         } else if (this.sqlSessionFactory != null) {
32           definition.getPropertyValues().add("sqlSessionFactory", this.sqlSessionFactory);
33           explicitFactoryUsed = true;
34         }
35 
36         //如果sqlSessionTemplateBeanName的名字不為空 則在Spring容器中查詢
37         //適合多資料來源
38         if (StringUtils.ha
39         if (StringUtils.hasText(this.sqlSessionTemplateBeanName)) {
40           if (explicitFactoryUsed) {
41             logger.warn("Cannot use both: sqlSessionTemplate and sqlSessionFactory together. sqlSessionFactory is ignored.");
42           }
43           definition.getPropertyValues().add("sqlSessionTemplate", new RuntimeBeanReference(this.sqlSessionTemplateBeanName));
44           explicitFactoryUsed = true;
45         } else if (this.sqlSessionTemplate != null) {
46           if (explicitFactoryUsed) {
47             logger.warn("Cannot use both: sqlSessionTemplate and sqlSessionFactory together. sqlSessionFactory is ignored.");
48           }
49           definition.getPropertyValues().add("sqlSessionTemplate", this.sqlSessionTemplate);
50           explicitFactoryUsed = true;
51         }
52 
53         if (!explicitFactoryUsed) {
54           if (logger.isDebugEnabled()) {
55             logger.debug("Enabling autowire by type for MapperFactoryBean with name '" + holder.getBeanName() + "'.");
56           }
57           definition.setAutowireMode(AbstractBeanDefinition.AUTOWIRE_BY_TYPE);
58         }
59       }
60     }
61     //這個集合返回以後 Spring容器會將裡面的所有內容註冊到容器中
62     return beanDefinitions;
63   }