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Java源码示例：org.apache.ibatis.session.LocalCacheScope

示例1
private void settingsElement(XNode context) throws Exception {
    if (context != null) {
        Properties props = context.getChildrenAsProperties();
        // Check that all settings are known to the configuration class
        MetaClass metaConfig = MetaClass.forClass(Configuration.class, localReflectorFactory);
        for (Object key : props.keySet()) {
            if (!metaConfig.hasSetter(String.valueOf(key))) {
                throw new BuilderException("The setting " + key + " is not known.  Make sure you spelled it correctly (case sensitive).");
            }
        }
        configuration.setAutoMappingBehavior(AutoMappingBehavior.valueOf(props.getProperty("autoMappingBehavior", "PARTIAL")));
        configuration.setCacheEnabled(booleanValueOf(props.getProperty("cacheEnabled"), true));
        configuration.setProxyFactory((ProxyFactory) createInstance(props.getProperty("proxyFactory")));
        configuration.setLazyLoadingEnabled(booleanValueOf(props.getProperty("lazyLoadingEnabled"), false));
        configuration.setAggressiveLazyLoading(booleanValueOf(props.getProperty("aggressiveLazyLoading"), true));
        configuration.setMultipleResultSetsEnabled(booleanValueOf(props.getProperty("multipleResultSetsEnabled"), true));
        configuration.setUseColumnLabel(booleanValueOf(props.getProperty("useColumnLabel"), true));
        configuration.setUseGeneratedKeys(booleanValueOf(props.getProperty("useGeneratedKeys"), false));
        configuration.setDefaultExecutorType(ExecutorType.valueOf(props.getProperty("defaultExecutorType", "SIMPLE")));
        configuration.setDefaultStatementTimeout(integerValueOf(props.getProperty("defaultStatementTimeout"), null));
        configuration.setDefaultFetchSize(integerValueOf(props.getProperty("defaultFetchSize"), null));
        configuration.setMapUnderscoreToCamelCase(booleanValueOf(props.getProperty("mapUnderscoreToCamelCase"), false));
        configuration.setSafeRowBoundsEnabled(booleanValueOf(props.getProperty("safeRowBoundsEnabled"), false));
        configuration.setLocalCacheScope(LocalCacheScope.valueOf(props.getProperty("localCacheScope", "SESSION")));
        configuration.setJdbcTypeForNull(JdbcType.valueOf(props.getProperty("jdbcTypeForNull", "OTHER")));
        configuration.setLazyLoadTriggerMethods(stringSetValueOf(props.getProperty("lazyLoadTriggerMethods"), "equals,clone,hashCode,toString"));
        configuration.setSafeResultHandlerEnabled(booleanValueOf(props.getProperty("safeResultHandlerEnabled"), true));
        configuration.setDefaultScriptingLanguage(resolveClass(props.getProperty("defaultScriptingLanguage")));
        configuration.setCallSettersOnNulls(booleanValueOf(props.getProperty("callSettersOnNulls"), false));
        configuration.setLogPrefix(props.getProperty("logPrefix"));
        configuration.setLogImpl(resolveClass(props.getProperty("logImpl")));
    }
}
示例2
@Test
public void testSelectShouldFlushLocalCacheIfFlushLocalCacheAtferEachStatementIsTrue() throws SQLException {
  sqlSessionFactory.getConfiguration().setLocalCacheScope(LocalCacheScope.STATEMENT);
  SqlSession sqlSession = sqlSessionFactory.openSession(ExecutorType.SIMPLE);
  try {
    PersonMapper personMapper = sqlSession.getMapper(PersonMapper.class);
    List<Person> people = personMapper.selectAllNoFlush();
    updateDatabase(sqlSession.getConnection());
    people = personMapper.selectAllFlush();
    assertEquals("Simone", people.get(0).getFirstName());
    sqlSession.commit();
  } finally {
    sqlSession.close();
  }
}
示例3
@Test
public void testSelectShouldFlushLocalCacheIfFlushLocalCacheAtferEachStatementIsTrue() throws SQLException {
  sqlSessionFactory.getConfiguration().setLocalCacheScope(LocalCacheScope.STATEMENT);
  SqlSession sqlSession = sqlSessionFactory.openSession(ExecutorType.SIMPLE);
  try {
    PersonMapper personMapper = sqlSession.getMapper(PersonMapper.class);
    List<Person> people = personMapper.selectAllNoFlush();
    updateDatabase(sqlSession.getConnection());
    people = personMapper.selectAllFlush();
    assertEquals("Simone", people.get(0).getFirstName());
    sqlSession.commit();
  } finally {
    sqlSession.close();
  }
}
示例4
private void settingsElement(XNode context) throws Exception {
  if (context != null) {
    Properties props = context.getChildrenAsProperties();
    // Check that all settings are known to the configuration class
    MetaClass metaConfig = MetaClass.forClass(Configuration.class);
    for (Object key : props.keySet()) {
      if (!metaConfig.hasSetter(String.valueOf(key))) {
        throw new BuilderException("The setting " + key + " is not known.  Make sure you spelled it correctly (case sensitive).");
      }
    }
    configuration.setAutoMappingBehavior(AutoMappingBehavior.valueOf(props.getProperty("autoMappingBehavior", "PARTIAL")));
    configuration.setCacheEnabled(booleanValueOf(props.getProperty("cacheEnabled"), true));
    configuration.setProxyFactory((ProxyFactory) createInstance(props.getProperty("proxyFactory")));
    configuration.setLazyLoadingEnabled(booleanValueOf(props.getProperty("lazyLoadingEnabled"), false));
    configuration.setAggressiveLazyLoading(booleanValueOf(props.getProperty("aggressiveLazyLoading"), true));
    configuration.setMultipleResultSetsEnabled(booleanValueOf(props.getProperty("multipleResultSetsEnabled"), true));
    configuration.setUseColumnLabel(booleanValueOf(props.getProperty("useColumnLabel"), true));
    configuration.setUseGeneratedKeys(booleanValueOf(props.getProperty("useGeneratedKeys"), false));
    configuration.setDefaultExecutorType(ExecutorType.valueOf(props.getProperty("defaultExecutorType", "SIMPLE")));
    configuration.setDefaultStatementTimeout(integerValueOf(props.getProperty("defaultStatementTimeout"), null));
    configuration.setMapUnderscoreToCamelCase(booleanValueOf(props.getProperty("mapUnderscoreToCamelCase"), false));
    configuration.setSafeRowBoundsEnabled(booleanValueOf(props.getProperty("safeRowBoundsEnabled"), false));
    configuration.setLocalCacheScope(LocalCacheScope.valueOf(props.getProperty("localCacheScope", "SESSION")));
    configuration.setJdbcTypeForNull(JdbcType.valueOf(props.getProperty("jdbcTypeForNull", "OTHER")));
    configuration.setLazyLoadTriggerMethods(stringSetValueOf(props.getProperty("lazyLoadTriggerMethods"), "equals,clone,hashCode,toString"));
    configuration.setSafeResultHandlerEnabled(booleanValueOf(props.getProperty("safeResultHandlerEnabled"), true));
    configuration.setDefaultScriptingLanguage(resolveClass(props.getProperty("defaultScriptingLanguage")));
    configuration.setCallSettersOnNulls(booleanValueOf(props.getProperty("callSettersOnNulls"), false));
    configuration.setLogPrefix(props.getProperty("logPrefix"));
    configuration.setLogImpl(resolveClass(props.getProperty("logImpl")));
    configuration.setConfigurationFactory(resolveClass(props.getProperty("configurationFactory")));
  }
}
示例5
private void settingsElement(XNode context) throws Exception {
  if (context != null) {
    Properties props = context.getChildrenAsProperties();
    // Check that all settings are known to the configuration class
    //检查下是否在Configuration类里都有相应的setter方法（没有拼写错误）
    MetaClass metaConfig = MetaClass.forClass(Configuration.class);
    for (Object key : props.keySet()) {
      if (!metaConfig.hasSetter(String.valueOf(key))) {
        throw new BuilderException("The setting " + key + " is not known.  Make sure you spelled it correctly (case sensitive).");
      }
    }
    
    //下面非常简单，一个个设置属性
    //如何自动映射列到字段/ 属性
    configuration.setAutoMappingBehavior(AutoMappingBehavior.valueOf(props.getProperty("autoMappingBehavior", "PARTIAL")));
    //缓存
    configuration.setCacheEnabled(booleanValueOf(props.getProperty("cacheEnabled"), true));
    //proxyFactory (CGLIB | JAVASSIST)
    //延迟加载的核心技术就是用代理模式，CGLIB/JAVASSIST两者选一
    configuration.setProxyFactory((ProxyFactory) createInstance(props.getProperty("proxyFactory")));
    //延迟加载
    configuration.setLazyLoadingEnabled(booleanValueOf(props.getProperty("lazyLoadingEnabled"), false));
    //延迟加载时，每种属性是否还要按需加载
    configuration.setAggressiveLazyLoading(booleanValueOf(props.getProperty("aggressiveLazyLoading"), true));
    //允不允许多种结果集从一个单独 的语句中返回
    configuration.setMultipleResultSetsEnabled(booleanValueOf(props.getProperty("multipleResultSetsEnabled"), true));
    //使用列标签代替列名
    configuration.setUseColumnLabel(booleanValueOf(props.getProperty("useColumnLabel"), true));
    //允许 JDBC 支持生成的键
    configuration.setUseGeneratedKeys(booleanValueOf(props.getProperty("useGeneratedKeys"), false));
    //配置默认的执行器
    configuration.setDefaultExecutorType(ExecutorType.valueOf(props.getProperty("defaultExecutorType", "SIMPLE")));
    //超时时间
    configuration.setDefaultStatementTimeout(integerValueOf(props.getProperty("defaultStatementTimeout"), null));
    //是否将DB字段自动映射到驼峰式Java属性（A_COLUMN-->aColumn）
    configuration.setMapUnderscoreToCamelCase(booleanValueOf(props.getProperty("mapUnderscoreToCamelCase"), false));
    //嵌套语句上使用RowBounds
    configuration.setSafeRowBoundsEnabled(booleanValueOf(props.getProperty("safeRowBoundsEnabled"), false));
    //默认用session级别的缓存
    configuration.setLocalCacheScope(LocalCacheScope.valueOf(props.getProperty("localCacheScope", "SESSION")));
    //为null值设置jdbctype
    configuration.setJdbcTypeForNull(JdbcType.valueOf(props.getProperty("jdbcTypeForNull", "OTHER")));
    //Object的哪些方法将触发延迟加载
    configuration.setLazyLoadTriggerMethods(stringSetValueOf(props.getProperty("lazyLoadTriggerMethods"), "equals,clone,hashCode,toString"));
    //使用安全的ResultHandler
    configuration.setSafeResultHandlerEnabled(booleanValueOf(props.getProperty("safeResultHandlerEnabled"), true));
    //动态SQL生成语言所使用的脚本语言
    configuration.setDefaultScriptingLanguage(resolveClass(props.getProperty("defaultScriptingLanguage")));
    //当结果集中含有Null值时是否执行映射对象的setter或者Map对象的put方法。此设置对于原始类型如int,boolean等无效。 
    configuration.setCallSettersOnNulls(booleanValueOf(props.getProperty("callSettersOnNulls"), false));
    //logger名字的前缀
    configuration.setLogPrefix(props.getProperty("logPrefix"));
    //显式定义用什么log框架，不定义则用默认的自动发现jar包机制
    configuration.setLogImpl(resolveClass(props.getProperty("logImpl")));
    //配置工厂
    configuration.setConfigurationFactory(resolveClass(props.getProperty("configurationFactory")));
  }
}
示例6
@SuppressWarnings("unchecked")
@Override
public <E> List<E> query(MappedStatement ms, Object parameter, RowBounds rowBounds, ResultHandler resultHandler, CacheKey key, BoundSql boundSql) throws SQLException {
  ErrorContext.instance().resource(ms.getResource()).activity("executing a query").object(ms.getId());
  //如果已经关闭，报错
  if (closed) {
    throw new ExecutorException("Executor was closed.");
  }
  //先清局部缓存，再查询.但仅查询堆栈为0，才清。为了处理递归调用
  if (queryStack == 0 && ms.isFlushCacheRequired()) {
    clearLocalCache();
  }
  List<E> list;
  try {
    //加一,这样递归调用到上面的时候就不会再清局部缓存了
    queryStack++;
    //先根据cachekey从localCache去查
    list = resultHandler == null ? (List<E>) localCache.getObject(key) : null;
    if (list != null) {
      //若查到localCache缓存，处理localOutputParameterCache
      handleLocallyCachedOutputParameters(ms, key, parameter, boundSql);
    } else {
      //从数据库查
      list = queryFromDatabase(ms, parameter, rowBounds, resultHandler, key, boundSql);
    }
  } finally {
    //清空堆栈
    queryStack--;
  }
  if (queryStack == 0) {
    //延迟加载队列中所有元素
    for (DeferredLoad deferredLoad : deferredLoads) {
      deferredLoad.load();
    }
    // issue #601
    //清空延迟加载队列
    deferredLoads.clear();
    if (configuration.getLocalCacheScope() == LocalCacheScope.STATEMENT) {
      // issue #482
  	//如果是STATEMENT，清本地缓存
      clearLocalCache();
    }
  }
  return list;
}
示例7
private void settingsElement(XNode context) throws Exception {
  if (context != null) {
    Properties props = context.getChildrenAsProperties();
    // Check that all settings are known to the configuration class
    //检查下是否在Configuration类里都有相应的setter方法（没有拼写错误）
    MetaClass metaConfig = MetaClass.forClass(Configuration.class);
    for (Object key : props.keySet()) {
      if (!metaConfig.hasSetter(String.valueOf(key))) {
        throw new BuilderException("The setting " + key + " is not known.  Make sure you spelled it correctly (case sensitive).");
      }
    }
    
    //下面非常简单，一个个设置属性
    //如何自动映射列到字段/ 属性
    configuration.setAutoMappingBehavior(AutoMappingBehavior.valueOf(props.getProperty("autoMappingBehavior", "PARTIAL")));
    //缓存
    configuration.setCacheEnabled(booleanValueOf(props.getProperty("cacheEnabled"), true));
    //proxyFactory (CGLIB | JAVASSIST)
    //延迟加载的核心技术就是用代理模式，CGLIB/JAVASSIST两者选一
    configuration.setProxyFactory((ProxyFactory) createInstance(props.getProperty("proxyFactory")));
    //延迟加载
    configuration.setLazyLoadingEnabled(booleanValueOf(props.getProperty("lazyLoadingEnabled"), false));
    //延迟加载时，每种属性是否还要按需加载
    configuration.setAggressiveLazyLoading(booleanValueOf(props.getProperty("aggressiveLazyLoading"), true));
    //允不允许多种结果集从一个单独 的语句中返回
    configuration.setMultipleResultSetsEnabled(booleanValueOf(props.getProperty("multipleResultSetsEnabled"), true));
    //使用列标签代替列名
    configuration.setUseColumnLabel(booleanValueOf(props.getProperty("useColumnLabel"), true));
    //允许 JDBC 支持生成的键
    configuration.setUseGeneratedKeys(booleanValueOf(props.getProperty("useGeneratedKeys"), false));
    //配置默认的执行器
    configuration.setDefaultExecutorType(ExecutorType.valueOf(props.getProperty("defaultExecutorType", "SIMPLE")));
    //超时时间
    configuration.setDefaultStatementTimeout(integerValueOf(props.getProperty("defaultStatementTimeout"), null));
    //是否将DB字段自动映射到驼峰式Java属性（A_COLUMN-->aColumn）
    configuration.setMapUnderscoreToCamelCase(booleanValueOf(props.getProperty("mapUnderscoreToCamelCase"), false));
    //嵌套语句上使用RowBounds
    configuration.setSafeRowBoundsEnabled(booleanValueOf(props.getProperty("safeRowBoundsEnabled"), false));
    //默认用session级别的缓存
    configuration.setLocalCacheScope(LocalCacheScope.valueOf(props.getProperty("localCacheScope", "SESSION")));
    //为null值设置jdbctype
    configuration.setJdbcTypeForNull(JdbcType.valueOf(props.getProperty("jdbcTypeForNull", "OTHER")));
    //Object的哪些方法将触发延迟加载
    configuration.setLazyLoadTriggerMethods(stringSetValueOf(props.getProperty("lazyLoadTriggerMethods"), "equals,clone,hashCode,toString"));
    //使用安全的ResultHandler
    configuration.setSafeResultHandlerEnabled(booleanValueOf(props.getProperty("safeResultHandlerEnabled"), true));
    //动态SQL生成语言所使用的脚本语言
    configuration.setDefaultScriptingLanguage(resolveClass(props.getProperty("defaultScriptingLanguage")));
    //当结果集中含有Null值时是否执行映射对象的setter或者Map对象的put方法。此设置对于原始类型如int,boolean等无效。 
    configuration.setCallSettersOnNulls(booleanValueOf(props.getProperty("callSettersOnNulls"), false));
    //logger名字的前缀
    configuration.setLogPrefix(props.getProperty("logPrefix"));
    //显式定义用什么log框架，不定义则用默认的自动发现jar包机制
    configuration.setLogImpl(resolveClass(props.getProperty("logImpl")));
    //配置工厂
    configuration.setConfigurationFactory(resolveClass(props.getProperty("configurationFactory")));
  }
}
示例8
@SuppressWarnings("unchecked")
@Override
public <E> List<E> query(MappedStatement ms, Object parameter, RowBounds rowBounds, ResultHandler resultHandler, CacheKey key, BoundSql boundSql) throws SQLException {
  ErrorContext.instance().resource(ms.getResource()).activity("executing a query").object(ms.getId());
  //如果已经关闭，报错
  if (closed) {
    throw new ExecutorException("Executor was closed.");
  }
  //先清局部缓存，再查询.但仅查询堆栈为0，才清。为了处理递归调用
  if (queryStack == 0 && ms.isFlushCacheRequired()) {
    clearLocalCache();
  }
  List<E> list;
  try {
    //加一,这样递归调用到上面的时候就不会再清局部缓存了
    queryStack++;
    //先根据cachekey从localCache去查
    list = resultHandler == null ? (List<E>) localCache.getObject(key) : null;
    if (list != null) {
      //若查到localCache缓存，处理localOutputParameterCache
      handleLocallyCachedOutputParameters(ms, key, parameter, boundSql);
    } else {
      //从数据库查
      list = queryFromDatabase(ms, parameter, rowBounds, resultHandler, key, boundSql);
    }
  } finally {
    //清空堆栈
    queryStack--;
  }
  if (queryStack == 0) {
    //延迟加载队列中所有元素
    for (DeferredLoad deferredLoad : deferredLoads) {
      deferredLoad.load();
    }
    // issue #601
    //清空延迟加载队列
    deferredLoads.clear();
    if (configuration.getLocalCacheScope() == LocalCacheScope.STATEMENT) {
      // issue #482
  	//如果是STATEMENT，清本地缓存
      clearLocalCache();
    }
  }
  return list;
}