Executor.cpp
上传用户:romrleung
上传日期:2022-05-23
资源大小:18897k
文件大小:2k
- /* Copyright (C) 2003 MySQL AB
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
- #include <common/common.hpp>
- #include <common/CodeTree.hpp>
- #include <common/StmtArea.hpp>
- #include <codegen/Code_root.hpp>
- #include "Executor.hpp"
- void
- Executor::execute(Ctx& ctx)
- {
- Exec_base::Ctl ctl(0);
- Exec_root* execRoot = static_cast<Exec_root*>(m_stmtArea.m_execTree);
- ctx_assert(execRoot != 0);
- rebind(ctx);
- if (! ctx.ok())
- return;
- execRoot->execute(ctx, ctl);
- if (! ctx.ok())
- return;
- ctx_log2(("Executor: execute done"));
- }
- void
- Executor::fetch(Ctx& ctx)
- {
- Exec_base::Ctl ctl(0);
- Exec_root* execRoot = static_cast<Exec_root*>(m_stmtArea.m_execTree);
- ctx_assert(execRoot != 0);
- rebind(ctx);
- if (! ctx.ok())
- return;
- execRoot->fetch(ctx, ctl);
- if (! ctx.ok())
- return;
- ctx_log2(("Executor: fetch done"));
- }
- void
- Executor::rebind(Ctx& ctx)
- {
- Exec_root* execRoot = static_cast<Exec_root*>(m_stmtArea.m_execTree);
- ctx_assert(execRoot != 0);
- DescArea& apd = m_stmtArea.descArea(Desc_usage_APD);
- DescArea& ard = m_stmtArea.descArea(Desc_usage_ARD);
- if (! apd.isBound() || ! ard.isBound()) {
- ctx_log2(("Executor: rebind required"));
- execRoot->bind(ctx);
- if (! ctx.ok())
- return;
- apd.setBound(true);
- ard.setBound(true);
- }
- }