MyBatis源码解析系列三--从诞下SqlSession说起(3/4)

public Executor newExecutor(Transaction transaction, ExecutorType executorType) {
        executorType = executorType == null ? this.defaultExecutorType : executorType;
        executorType = executorType == null ? ExecutorType.SIMPLE : executorType;
        Object executor;
        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);
        }

        if (this.cacheEnabled) {
            executor = new CachingExecutor((Executor)executor);
        }

        Executor executor = (Executor)this.interceptorChain.pluginAll(executor);
        return executor;
    }

 那我们这里得到的Executor经过判断就是SimpleExecutor了。

⑤在 var8 = new DefaultSqlSession(this.configuration, executor, autoCommit);中，我们要去获取SqlSession的实现类了DefaultSqlSession，终于到了最后。源码如下：

public DefaultSqlSession(Configuration configuration, Executor executor, boolean autoCommit) {
        this.configuration = configuration;
        this.executor = executor;
        this.dirty = false;
        this.autoCommit = autoCommit;
    }

这样，SqlSession的实现类DefaultSqlSession就拥有了配置对象信息，拥有了执行器信息，那么它就知道怎么去处理sql语句了。看看，这个configuration对象贯穿始终，核心的核心，源码是不会骗人的。

2、在private SqlSession openSessionFromConnection(ExecutorType execType, Connection connection)方法中，它的源码如下：