与spring的整合

与spring的整合主要是mapper接口注入进IOC容器。
有两种方法。1.使用@Mapper注解，2.使用@MapperScan(“包”)
@Mapper注解的扫描在自动配置类：AutoConfiguredMapperScannerRegistrar#registerBeanDefinitions

    public void registerBeanDefinitions(AnnotationMetadata importingClassMetadata, BeanDefinitionRegistry registry) {logger.debug("Searching for mappers annotated with @Mapper");// 这是关键。ClassPathMapperScanner scanner = new ClassPathMapperScanner(registry);try {if (this.resourceLoader != null) {scanner.setResourceLoader(this.resourceLoader);}List<String> packages = AutoConfigurationPackages.get(this.beanFactory);if (logger.isDebugEnabled()) {for (String pkg : packages) {logger.debug("Using auto-configuration base package '{}'", pkg);}}// 扫描有Mapper注解的类scanner.setAnnotationClass(Mapper.class);// 注册过滤器，包括在内的，排除的scanner.registerFilters();// 传入包位置，将核实的类创建bd,注册进factory.scanner.doScan(StringUtils.toStringArray(packages));} catch (IllegalStateException ex) {logger.debug("Could not determine auto-configuration package, automatic mapper scanning disabled.", ex);}}

org.mybatis.spring.mapper.ClassPathMapperScanner#doScan

  public Set<BeanDefinitionHolder> doScan(String... basePackages) {// 得到目标bdSet<BeanDefinitionHolder> beanDefinitions = super.doScan(basePackages);if (beanDefinitions.isEmpty()) {logger.warn("No MyBatis mapper was found in '" + Arrays.toString(basePackages) + "' package. Please check your configuration.");} else {// 处理dbprocessBeanDefinitions(beanDefinitions);}return beanDefinitions;}

private void processBeanDefinitions(Set<BeanDefinitionHolder> beanDefinitions) {GenericBeanDefinition definition;// 遍历bdfor (BeanDefinitionHolder holder : beanDefinitions) {definition = (GenericBeanDefinition) holder.getBeanDefinition();if (logger.isDebugEnabled()) {logger.debug("Creating MapperFactoryBean with name '" + holder.getBeanName() + "' and '" + definition.getBeanClassName() + "' mapperInterface");}// the mapper interface is the original class of the bean// 设置bd的构造函数参数，实例化是使用该构造器      definition.getConstructorArgumentValues().addGenericArgumentValue(definition.getBeanClassName()); // issue #59// 实例化的class换成了mapperFactoryBean的classdefinition.setBeanClass(this.mapperFactoryBean.getClass());definition.getPropertyValues().add("addToConfig", this.addToConfig);boolean explicitFactoryUsed = false;if (StringUtils.hasText(this.sqlSessionFactoryBeanName)) {definition.getPropertyValues().add("sqlSessionFactory", new RuntimeBeanReference(this.sqlSessionFactoryBeanName));explicitFactoryUsed = true;} else if (this.sqlSessionFactory != null) {definition.getPropertyValues().add("sqlSessionFactory", this.sqlSessionFactory);explicitFactoryUsed = true;}if (StringUtils.hasText(this.sqlSessionTemplateBeanName)) {if (explicitFactoryUsed) {logger.warn("Cannot use both: sqlSessionTemplate and sqlSessionFactory together. sqlSessionFactory is ignored.");}definition.getPropertyValues().add("sqlSessionTemplate", new RuntimeBeanReference(this.sqlSessionTemplateBeanName));explicitFactoryUsed = true;} else if (this.sqlSessionTemplate != null) {if (explicitFactoryUsed) {logger.warn("Cannot use both: sqlSessionTemplate and sqlSessionFactory together. sqlSessionFactory is ignored.");}definition.getPropertyValues().add("sqlSessionTemplate", this.sqlSessionTemplate);explicitFactoryUsed = true;}if (!explicitFactoryUsed) {if (logger.isDebugEnabled()) {logger.debug("Enabling autowire by type for MapperFactoryBean with name '" + holder.getBeanName() + "'.");}// 注入模式是根据类型注入属性definition.setAutowireMode(AbstractBeanDefinition.AUTOWIRE_BY_TYPE);}}}

实例化的class变成了mapperfactorybean.
实例化的类的时候，将该接口注册经configuration缓存。

  protected void checkDaoConfig() {super.checkDaoConfig();notNull(this.mapperInterface, "Property 'mapperInterface' is required");Configuration configuration = getSqlSession().getConfiguration();if (this.addToConfig && !configuration.hasMapper(this.mapperInterface)) {try {configuration.addMapper(this.mapperInterface);} catch (Exception e) {logger.error("Error while adding the mapper '" + this.mapperInterface + "' to configuration.", e);throw new IllegalArgumentException(e);} finally {ErrorContext.instance().reset();}}}// 实例化的时候,因为是factorybean,会调用getObejct()方法获得目标类的实例。这是一个代理类。public T getObject() throws Exception {return getSqlSession().getMapper(this.mapperInterface);}

@MapperScan注解使用的底层的@import注入bean.原来依旧是ClassPathMapperScanner
org.mybatis.spring.annotation.MapperScannerRegistrar#registerBeanDefinitions

  public void registerBeanDefinitions(AnnotationMetadata importingClassMetadata, BeanDefinitionRegistry registry) {AnnotationAttributes annoAttrs = AnnotationAttributes.fromMap(importingClassMetadata.getAnnotationAttributes(MapperScan.class.getName()));ClassPathMapperScanner scanner = new ClassPathMapperScanner(registry);// this check is needed in Spring 3.1if (resourceLoader != null) {scanner.setResourceLoader(resourceLoader);}Class<? extends Annotation> annotationClass = annoAttrs.getClass("annotationClass");if (!Annotation.class.equals(annotationClass)) {scanner.setAnnotationClass(annotationClass);}Class<?> markerInterface = annoAttrs.getClass("markerInterface");if (!Class.class.equals(markerInterface)) {scanner.setMarkerInterface(markerInterface);}Class<? extends BeanNameGenerator> generatorClass = annoAttrs.getClass("nameGenerator");if (!BeanNameGenerator.class.equals(generatorClass)) {scanner.setBeanNameGenerator(BeanUtils.instantiateClass(generatorClass));}Class<? extends MapperFactoryBean> mapperFactoryBeanClass = annoAttrs.getClass("factoryBean");if (!MapperFactoryBean.class.equals(mapperFactoryBeanClass)) {scanner.setMapperFactoryBean(BeanUtils.instantiateClass(mapperFactoryBeanClass));}scanner.setSqlSessionTemplateBeanName(annoAttrs.getString("sqlSessionTemplateRef"));scanner.setSqlSessionFactoryBeanName(annoAttrs.getString("sqlSessionFactoryRef"));List<String> basePackages = new ArrayList<String>();for (String pkg : annoAttrs.getStringArray("value")) {if (StringUtils.hasText(pkg)) {basePackages.add(pkg);}}for (String pkg : annoAttrs.getStringArray("basePackages")) {if (StringUtils.hasText(pkg)) {basePackages.add(pkg);}}for (Class<?> clazz : annoAttrs.getClassArray("basePackageClasses")) {basePackages.add(ClassUtils.getPackageName(clazz));}scanner.registerFilters();scanner.doScan(StringUtils.toStringArray(basePackages));}

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