Mybatis执行Executor（一）

r囧r小猫 2022-03-09 11:38 206阅读 0赞

在DefaultSqlSession中我们可以看到一系列的增删改查操作的其实都是在调用Executor的接口，Mybatis对外统一提供了一个操作接口类Executor，提供的接口方法有update、query、flushStatements、commit、rollback等接口函数，源码如下：

/**
     * @author Clinton Begin
     */
    public interface Executor {
     
      ResultHandler NO_RESULT_HANDLER = null;
      
      /* 更新操作**/
      int update(MappedStatement ms, Object parameter) throws SQLException;
     
      /* 查询操作*/
      <E> List<E> query(MappedStatement ms, Object parameter, RowBounds rowBounds, ResultHandler resultHandler, CacheKey cacheKey, BoundSql boundSql) throws SQLException;
     
      <E> List<E> query(MappedStatement ms, Object parameter, RowBounds rowBounds, ResultHandler resultHandler) throws SQLException;
     
      /* 更新statement操作*/
      List<BatchResult> flushStatements() throws SQLException;
      /*提交操作*/
      void commit(boolean required) throws SQLException;
      /*事务回滚操作*/
      void rollback(boolean required) throws SQLException;
      /*缓存key操作*/
      CacheKey createCacheKey(MappedStatement ms, Object parameterObject, RowBounds rowBounds, BoundSql boundSql);
      /*是否开启缓存*/
      boolean isCached(MappedStatement ms, CacheKey key);
      /*清除本地缓存操作*/
      void clearLocalCache();
      /*推迟加载操作*/
      void deferLoad(MappedStatement ms, MetaObject resultObject, String property, CacheKey key, Class<?> targetType);
      /*获取事务*/
      Transaction getTransaction();
     
      /*关闭连接*/
      void close(boolean forceRollback);
     
      boolean isClosed();
     
      void setExecutorWrapper(Executor executor);
     
    }

Executor接口只是简单 的定义了一些基本的操作接口，具体实现类有抽象类BaseExecutor、实现类CachingExecutor、实现类BatchExecutor、实现类ReuseExecutor和实现类SimpleExecutor，这些实现类的具体操作我们在接下来的博客中会一步一步进行分析，如下图所示：  
![20160923202311172][]

本文原文地址：[https://blog.csdn.net/qq924862077/article/details/52642836][https_blog.csdn.net_qq924862077_article_details_52642836]

[20160923202311172]: /images/20220309/aa3649b273594320a9f3c81d0ee5d2af.png
[https_blog.csdn.net_qq924862077_article_details_52642836]: https://blog.csdn.net/qq924862077/article/details/52642836