Mybatis的配置类
创新互联公司坚持“要么做到,要么别承诺”的工作理念,服务领域包括:网站设计制作、网站设计、企业官网、英文网站、手机端网站、网站推广等服务,满足客户于互联网时代的积石山保安族东乡族网站设计、移动媒体设计的需求,帮助企业找到有效的互联网解决方案。努力成为您成熟可靠的网络建设合作伙伴!
public class Configuration {
//环境
protected Environment environment;
//---------节点-------
protected boolean safeRowBoundsEnabled = false;
protected boolean safeResultHandlerEnabled = true;
protected boolean mapUnderscoreToCamelCase = false;
protected boolean aggressiveLazyLoading = true;
protected boolean multipleResultSetsEnabled = true;
protected boolean useGeneratedKeys = false;
protected boolean useColumnLabel = true;
//默认启用缓存
protected boolean cacheEnabled = true;
protected boolean callSettersOnNulls = false;
protected String logPrefix;
protected Class extends Log> logImpl;
protected LocalCacheScope localCacheScope = LocalCacheScope.SESSION;
protected JdbcType jdbcTypeForNull = JdbcType.OTHER;
protected Set lazyLoadTriggerMethods = new HashSet(Arrays.asList(new String[] { "equals", "clone", "hashCode", "toString" }));
protected Integer defaultStatementTimeout;
//默认为简单执行器
protected ExecutorType defaultExecutorType = ExecutorType.SIMPLE;
protected AutoMappingBehavior autoMappingBehavior = AutoMappingBehavior.PARTIAL;
//---------节点-------
protected Properties variables = new Properties();
//对象工厂和对象包装器工厂
protected ObjectFactory objectFactory = new DefaultObjectFactory();
protected ObjectWrapperFactory objectWrapperFactory = new DefaultObjectWrapperFactory();
//映射注册机
protected MapperRegistry mapperRegistry = new MapperRegistry(this);
//默认禁用延迟加载
protected boolean lazyLoadingEnabled = false;
protected ProxyFactory proxyFactory = new JavassistProxyFactory(); // #224 Using internal Javassist instead of OGNL
protected String databaseId;
/**
* Configuration factory class.
* Used to create Configuration for loading deserialized unread properties.
*
* @see Issue 300 (google code)
*/
protected Class> configurationFactory;
protected final InterceptorChain interceptorChain = new InterceptorChain();
//类型处理器注册机
protected final TypeHandlerRegistry typeHandlerRegistry = new TypeHandlerRegistry();
//类型别名注册机
protected final TypeAliasRegistry typeAliasRegistry = new TypeAliasRegistry();
protected final LanguageDriverRegistry languageRegistry = new LanguageDriverRegistry();
//映射的语句,存在Map里
protected final Map mappedStatements = new StrictMap("Mapped Statements collection");
//缓存,存在Map里
protected final Map caches = new StrictMap("Caches collection");
//结果映射,存在Map里
protected final Map resultMaps = new StrictMap("Result Maps collection");
protected final Map parameterMaps = new StrictMap("Parameter Maps collection");
protected final Map keyGenerators = new StrictMap("Key Generators collection");
protected final Set loadedResources = new HashSet();
protected final Map sqlFragments = new StrictMap("XML fragments parsed from previous mappers");
//不完整的SQL语句
protected final Collection incompleteStatements = new LinkedList();
protected final Collection incompleteCacheRefs = new LinkedList();
protected final Collection incompleteResultMaps = new LinkedList();
protected final Collection incompleteMethods = new LinkedList();
/*
* A map holds cache-ref relationship. The key is the namespace that
* references a cache bound to another namespace and the value is the
* namespace which the actual cache is bound to.
*/
protected final Map cacheRefMap = new HashMap();
public Configuration(Environment environment) {
this();
this.environment = environment;
}
public Configuration() {
//注册更多的类型别名
typeAliasRegistry.registerAlias("JDBC", JdbcTransactionFactory.class);
typeAliasRegistry.registerAlias("MANAGED", ManagedTransactionFactory.class);
typeAliasRegistry.registerAlias("JNDI", JndiDataSourceFactory.class);
typeAliasRegistry.registerAlias("POOLED", PooledDataSourceFactory.class);
typeAliasRegistry.registerAlias("UNPOOLED", UnpooledDataSourceFactory.class);
typeAliasRegistry.registerAlias("PERPETUAL", PerpetualCache.class);
typeAliasRegistry.registerAlias("FIFO", FifoCache.class);
typeAliasRegistry.registerAlias("LRU", LruCache.class);
typeAliasRegistry.registerAlias("SOFT", SoftCache.class);
typeAliasRegistry.registerAlias("WEAK", WeakCache.class);
typeAliasRegistry.registerAlias("DB_VENDOR", VendorDatabaseIdProvider.class);
typeAliasRegistry.registerAlias("XML", XMLLanguageDriver.class);
typeAliasRegistry.registerAlias("RAW", RawLanguageDriver.class);
typeAliasRegistry.registerAlias("SLF4J", Slf4jImpl.class);
typeAliasRegistry.registerAlias("COMMONS_LOGGING", JakartaCommonsLoggingImpl.class);
typeAliasRegistry.registerAlias("LOG4J", Log4jImpl.class);
typeAliasRegistry.registerAlias("LOG4J2", Log4j2Impl.class);
typeAliasRegistry.registerAlias("JDK_LOGGING", Jdk14LoggingImpl.class);
typeAliasRegistry.registerAlias("STDOUT_LOGGING", StdOutImpl.class);
typeAliasRegistry.registerAlias("NO_LOGGING", NoLoggingImpl.class);
typeAliasRegistry.registerAlias("CGLIB", CglibProxyFactory.class);
typeAliasRegistry.registerAlias("JAVASSIST", JavassistProxyFactory.class);
languageRegistry.setDefaultDriverClass(XMLLanguageDriver.class);
languageRegistry.register(RawLanguageDriver.class);
}
}
Configuration类具有产生执行器的功能
//产生执行器
public Executor newExecutor(Transaction transaction, ExecutorType executorType) {
executorType = executorType == null ? defaultExecutorType : executorType;
executorType = executorType == null ? ExecutorType.SIMPLE : executorType;
Executor executor;
//然后就是简单的3个分支,产生3种执行器BatchExecutor/ReuseExecutor/SimpleExecutor
if (ExecutorType.BATCH == executorType) {
executor = new BatchExecutor(this, transaction);
} else if (ExecutorType.REUSE == executorType) {
executor = new ReuseExecutor(this, transaction);
} else {
executor = new SimpleExecutor(this, transaction);
}
//如果要求缓存,生成另一种CachingExecutor(默认就是有缓存),装饰者模式,所以默认都是返回CachingExecutor
if (cacheEnabled) {
executor = new CachingExecutor(executor);
}
//此处调用插件,通过插件可以改变Executor行为
executor = (Executor) interceptorChain.pluginAll(executor);
return executor;
}