MyBatis工作原理

柔光的暖阳◎ 2022-02-25 02:48 258阅读 0赞

分析一个框架的工作原理需要分析框架源代码，使用Eclipse调试跟踪技术，通过线程调用堆栈和设置断点判断自己的推测，需要根据框架的使用接口设定跟踪的起点，以SSM框架中的Mybatis为例分析Mybatis的工作原理，可以通过我们如何使用Mybatis入手猜测Mybatis底层的工作原理，我们在使用Mybatis时只配置SQL和定义接口，定义输入和输出参数类型就可以使用Mybatis，由此可以推测出：

## 1、Mybatis必定使用了动态代理技术，因为只有接口无实现类我们是无法使用Mybatis的，那么实现类一定是动态代理生成的。可以通过源码跟踪去认证自己的推测。 ##

## 2、在定义SQL的XML文件中，我们可以定义任意的实体类，Mybatis都可以很好地工作，由此可以推测出Mybatis一定使用了反射技术，根据定义的类型生成相应的对象。 ##

测试代码下载：[https://pan.baidu.com/s/1LvQeJXjjVwQrqvnMlhp8pw][https_pan.baidu.com_s_1LvQeJXjjVwQrqvnMlhp8pw]  
提取码：ycmv![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FpeGlhbmdfY2hlbg_size_16_color_FFFFFF_t_70]

验证推测：  
从SSM配置文件中找到Mybatis的程序入口

<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> 
    		<property name="configLocation" value="classpath:SqlMapConfig.xml"/>
    		<property name="dataSource" ref="ds"></property>
    		
    		<property name="typeAliasesPackage" value="com.test.bean"></property>
    	</bean>
    	
    	
    	<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
    		<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
    		<property name="basePackage" value="com.gf.mapper"></property>
    	</bean>

## 点击org.mybatis.spring.SqlSessionFactoryBean打开源码查看 ##

/**
       * Build a {@code SqlSessionFactory} instance.
       *
       * The default implementation uses the standard MyBatis {@code XMLConfigBuilder} API to build a
       * {@code SqlSessionFactory} instance based on an Reader.
       * Since 1.3.0, it can be specified a {@link Configuration} instance directly(without config file).
       *
       * @return SqlSessionFactory
       * @throws IOException if loading the config file failed
       */
      protected SqlSessionFactory buildSqlSessionFactory() throws IOException {
    
        final Configuration targetConfiguration;
    
        XMLConfigBuilder xmlConfigBuilder = null;
        if (this.configuration != null) {
          targetConfiguration = this.configuration;
          if (targetConfiguration.getVariables() == null) {
            targetConfiguration.setVariables(this.configurationProperties);
          } else if (this.configurationProperties != null) {
            targetConfiguration.getVariables().putAll(this.configurationProperties);
          }
        } else if (this.configLocation != null) {
          xmlConfigBuilder = new XMLConfigBuilder(this.configLocation.getInputStream(), null, this.configurationProperties);
          targetConfiguration = xmlConfigBuilder.getConfiguration();
        } else {
          LOGGER.debug(() -> "Property 'configuration' or 'configLocation' not specified, using default MyBatis Configuration");
          targetConfiguration = new Configuration();
          Optional.ofNullable(this.configurationProperties).ifPresent(targetConfiguration::setVariables);
        }
    
        Optional.ofNullable(this.objectFactory).ifPresent(targetConfiguration::setObjectFactory);
        Optional.ofNullable(this.objectWrapperFactory).ifPresent(targetConfiguration::setObjectWrapperFactory);
        Optional.ofNullable(this.vfs).ifPresent(targetConfiguration::setVfsImpl);
    
        if (hasLength(this.typeAliasesPackage)) {
          String[] typeAliasPackageArray = tokenizeToStringArray(this.typeAliasesPackage,
              ConfigurableApplicationContext.CONFIG_LOCATION_DELIMITERS);
          Stream.of(typeAliasPackageArray).forEach(packageToScan -> {
            targetConfiguration.getTypeAliasRegistry().registerAliases(packageToScan,
                typeAliasesSuperType == null ? Object.class : typeAliasesSuperType);
            LOGGER.debug(() -> "Scanned package: '" + packageToScan + "' for aliases");
          });
        }
    
        if (!isEmpty(this.typeAliases)) {
          Stream.of(this.typeAliases).forEach(typeAlias -> {
            targetConfiguration.getTypeAliasRegistry().registerAlias(typeAlias);
            LOGGER.debug(() -> "Registered type alias: '" + typeAlias + "'");
          });
        }
    
        if (!isEmpty(this.plugins)) {
          Stream.of(this.plugins).forEach(plugin -> {
            targetConfiguration.addInterceptor(plugin);
            LOGGER.debug(() -> "Registered plugin: '" + plugin + "'");
          });
        }
    
        if (hasLength(this.typeHandlersPackage)) {
          String[] typeHandlersPackageArray = tokenizeToStringArray(this.typeHandlersPackage,
              ConfigurableApplicationContext.CONFIG_LOCATION_DELIMITERS);
          Stream.of(typeHandlersPackageArray).forEach(packageToScan -> {
            targetConfiguration.getTypeHandlerRegistry().register(packageToScan);
            LOGGER.debug(() -> "Scanned package: '" + packageToScan + "' for type handlers");
          });
        }
    
        if (!isEmpty(this.typeHandlers)) {
          Stream.of(this.typeHandlers).forEach(typeHandler -> {
            targetConfiguration.getTypeHandlerRegistry().register(typeHandler);
            LOGGER.debug(() -> "Registered type handler: '" + typeHandler + "'");
          });
        }
    
        if (this.databaseIdProvider != null) {//fix #64 set databaseId before parse mapper xmls
          try {
            targetConfiguration.setDatabaseId(this.databaseIdProvider.getDatabaseId(this.dataSource));
          } catch (SQLException e) {
            throw new NestedIOException("Failed getting a databaseId", e);
          }
        }
    
        Optional.ofNullable(this.cache).ifPresent(targetConfiguration::addCache);
    
        if (xmlConfigBuilder != null) {
          try {
            xmlConfigBuilder.parse();
            LOGGER.debug(() -> "Parsed configuration file: '" + this.configLocation + "'");
          } catch (Exception ex) {
            throw new NestedIOException("Failed to parse config resource: " + this.configLocation, ex);
          } finally {
            ErrorContext.instance().reset();
          }
        }
    
        targetConfiguration.setEnvironment(new Environment(this.environment,
            this.transactionFactory == null ? new SpringManagedTransactionFactory() : this.transactionFactory,
            this.dataSource));
    
        if (!isEmpty(this.mapperLocations)) {
          for (Resource mapperLocation : this.mapperLocations) {
            if (mapperLocation == null) {
              continue;
            }
    
            try {
              XMLMapperBuilder xmlMapperBuilder = new XMLMapperBuilder(mapperLocation.getInputStream(),
                  targetConfiguration, mapperLocation.toString(), targetConfiguration.getSqlFragments());
              xmlMapperBuilder.parse();
            } catch (Exception e) {
              throw new NestedIOException("Failed to parse mapping resource: '" + mapperLocation + "'", e);
            } finally {
              ErrorContext.instance().reset();
            }
            LOGGER.debug(() -> "Parsed mapper file: '" + mapperLocation + "'");
          }
        } else {
          LOGGER.debug(() -> "Property 'mapperLocations' was not specified or no matching resources found");
        }
    
        return this.sqlSessionFactoryBuilder.build(targetConfiguration);
      }

上面代码是解析XML，生成SqlSessionFactory，SqlSessionFactory是Mybatis的会话创建工程类  
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点击org.mybatis.spring.mapper.MapperScannerConfigurer打开源码查看

/**
       * {@inheritDoc}
       * 
       * @since 1.0.2
       */
      @Override
      public void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry registry) {
        if (this.processPropertyPlaceHolders) {
          processPropertyPlaceHolders();
        }
    
        ClassPathMapperScanner scanner = new ClassPathMapperScanner(registry);
        scanner.setAddToConfig(this.addToConfig);
        scanner.setAnnotationClass(this.annotationClass);
        scanner.setMarkerInterface(this.markerInterface);
        scanner.setSqlSessionFactory(this.sqlSessionFactory);
        scanner.setSqlSessionTemplate(this.sqlSessionTemplate);
        scanner.setSqlSessionFactoryBeanName(this.sqlSessionFactoryBeanName);
        scanner.setSqlSessionTemplateBeanName(this.sqlSessionTemplateBeanName);
        scanner.setResourceLoader(this.applicationContext);
        scanner.setBeanNameGenerator(this.nameGenerator);
        scanner.registerFilters();
        scanner.scan(StringUtils.tokenizeToStringArray(this.basePackage, ConfigurableApplicationContext.CONFIG_LOCATION_DELIMITERS));
      }

上面代码是扫描我们定义的Mapper接口所在包  
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上述两个类的配置将Mybatis环境配置好了，面向对象的程序设计都是事件驱动执行的，如果跟踪Mybatis的执行过程，我们需要找到一个执行入口，可以选定自己定义的Mapper接口  
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单步跟踪，找出线程执行堆栈信息  
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## 跟踪代码找出生成代理对象的代码 ##

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取消原来定义的断点，重新单步跟踪  
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至此第一个推断可以得到验证。

## 定义断点跟踪Mybatis执行过程 ##

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定位代码，依次执行下面几个方法：

@Override
      public List<Object> handleResultSets(Statement stmt) throws SQLException {
        ErrorContext.instance().activity("handling results").object(mappedStatement.getId());
    
        final List<Object> multipleResults = new ArrayList<Object>();
    
        int resultSetCount = 0;
        ResultSetWrapper rsw = getFirstResultSet(stmt);
    
        List<ResultMap> resultMaps = mappedStatement.getResultMaps();
        int resultMapCount = resultMaps.size();
        validateResultMapsCount(rsw, resultMapCount);
        while (rsw != null && resultMapCount > resultSetCount) {
          ResultMap resultMap = resultMaps.get(resultSetCount);
          handleResultSet(rsw, resultMap, multipleResults, null);
          rsw = getNextResultSet(stmt);
          cleanUpAfterHandlingResultSet();
          resultSetCount++;
        }
    
        String[] resultSets = mappedStatement.getResultSets();
        if (resultSets != null) {
          while (rsw != null && resultSetCount < resultSets.length) {
            ResultMapping parentMapping = nextResultMaps.get(resultSets[resultSetCount]);
            if (parentMapping != null) {
              String nestedResultMapId = parentMapping.getNestedResultMapId();
              ResultMap resultMap = configuration.getResultMap(nestedResultMapId);
              handleResultSet(rsw, resultMap, null, parentMapping);
            }
            rsw = getNextResultSet(stmt);
            cleanUpAfterHandlingResultSet();
            resultSetCount++;
          }
        }
    
        return collapseSingleResultList(multipleResults);
      }

private void handleResultSet(ResultSetWrapper rsw, ResultMap resultMap, List<Object> multipleResults, ResultMapping parentMapping) throws SQLException {
        try {
          if (parentMapping != null) {
            handleRowValues(rsw, resultMap, null, RowBounds.DEFAULT, parentMapping);
          } else {
            if (resultHandler == null) {
              DefaultResultHandler defaultResultHandler = new DefaultResultHandler(objectFactory);
              handleRowValues(rsw, resultMap, defaultResultHandler, rowBounds, null);
              multipleResults.add(defaultResultHandler.getResultList());
            } else {
              handleRowValues(rsw, resultMap, resultHandler, rowBounds, null);
            }
          }
        } finally {
          // issue #228 (close resultsets)
          closeResultSet(rsw.getResultSet());
        }
      }

public void handleRowValues(ResultSetWrapper rsw, ResultMap resultMap, ResultHandler<?> resultHandler, RowBounds rowBounds, ResultMapping parentMapping) throws SQLException {
        if (resultMap.hasNestedResultMaps()) {
          ensureNoRowBounds();
          checkResultHandler();
          handleRowValuesForNestedResultMap(rsw, resultMap, resultHandler, rowBounds, parentMapping);
        } else {
          handleRowValuesForSimpleResultMap(rsw, resultMap, resultHandler, rowBounds, parentMapping);
        }
      }

private void handleRowValuesForSimpleResultMap(ResultSetWrapper rsw, ResultMap resultMap, ResultHandler<?> resultHandler, RowBounds rowBounds, ResultMapping parentMapping)
          throws SQLException {
        DefaultResultContext<Object> resultContext = new DefaultResultContext<Object>();
        skipRows(rsw.getResultSet(), rowBounds);
        while (shouldProcessMoreRows(resultContext, rowBounds) && rsw.getResultSet().next()) {
          ResultMap discriminatedResultMap = resolveDiscriminatedResultMap(rsw.getResultSet(), resultMap, null);
          Object rowValue = getRowValue(rsw, discriminatedResultMap);
          storeObject(resultHandler, resultContext, rowValue, parentMapping, rsw.getResultSet());
        }
      }

private Object getRowValue(ResultSetWrapper rsw, ResultMap resultMap) throws SQLException {
        final ResultLoaderMap lazyLoader = new ResultLoaderMap();
        Object rowValue = createResultObject(rsw, resultMap, lazyLoader, null);
        if (rowValue != null && !hasTypeHandlerForResultObject(rsw, resultMap.getType())) {
          final MetaObject metaObject = configuration.newMetaObject(rowValue);
          boolean foundValues = this.useConstructorMappings;
          if (shouldApplyAutomaticMappings(resultMap, false)) {
            foundValues = applyAutomaticMappings(rsw, resultMap, metaObject, null) || foundValues;
          }
          foundValues = applyPropertyMappings(rsw, resultMap, metaObject, lazyLoader, null) || foundValues;
          foundValues = lazyLoader.size() > 0 || foundValues;
          rowValue = foundValues || configuration.isReturnInstanceForEmptyRow() ? rowValue : null;
        }
        return rowValue;
      }

private Object createResultObject(ResultSetWrapper rsw, ResultMap resultMap, ResultLoaderMap lazyLoader, String columnPrefix) throws SQLException {
        this.useConstructorMappings = false; // reset previous mapping result
        final List<Class<?>> constructorArgTypes = new ArrayList<Class<?>>();
        final List<Object> constructorArgs = new ArrayList<Object>();
        Object resultObject = createResultObject(rsw, resultMap, constructorArgTypes, constructorArgs, columnPrefix);
        if (resultObject != null && !hasTypeHandlerForResultObject(rsw, resultMap.getType())) {
          final List<ResultMapping> propertyMappings = resultMap.getPropertyResultMappings();
          for (ResultMapping propertyMapping : propertyMappings) {
            // issue gcode #109 && issue #149
            if (propertyMapping.getNestedQueryId() != null && propertyMapping.isLazy()) {
              resultObject = configuration.getProxyFactory().createProxy(resultObject, lazyLoader, configuration, objectFactory, constructorArgTypes, constructorArgs);
              break;
            }
          }
        }
        this.useConstructorMappings = resultObject != null && !constructorArgTypes.isEmpty(); // set current mapping result
        return resultObject;
      }

设置断点跟踪  
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## 根据代码跟踪我们可以断定Mybatis使用反射生成返回值对象类型，不过中间经历过很多过程 ##

[https_pan.baidu.com_s_1LvQeJXjjVwQrqvnMlhp8pw]: https://pan.baidu.com/s/1LvQeJXjjVwQrqvnMlhp8pw
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MyBatis工作原理

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