SimpleExecutor(简单执行器)

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目录

概 述

  public SimpleExecutor(Configuration configuration, Transaction transaction) {
    super(configuration, transaction);
  }

实例化完成以后：实例化完成以后，执行方法调用doQuery

  @Override
  public <E> List<E> doQuery(MappedStatement ms, Object parameter, RowBounds rowBounds, ResultHandler resultHandler, BoundSql boundSql) throws SQLException {
    .......
  }

我们可以看到这个方法是 @Override 重写父类的方法 ，去它的父类BaseExecutor看下该方法
BaseExecutor##doQuery

  protected abstract <E> List<E> doQuery(MappedStatement ms, Object parameter, RowBounds rowBounds, ResultHandler resultHandler, BoundSql boundSql)
      throws SQLException;

获取大管家 Configuration
每次都要newStatementHandler ，这个StatementHandler 后面我们重点将，是专门处理JDBC的
prepareStatement --> BaseStatementHandler #prepare 方法
调用SimpleStatementHandler#query

总结：

相关工具如下：

分析：

小结：

主要讲述了接下来实例化SimpleExecutor详解，请大家指正~

参考资料和推荐阅读

1.链接: 参考资料.