Code_expr_const.hpp
上传用户:romrleung
上传日期:2022-05-23
资源大小:18897k
文件大小:3k
源码类别:
MySQL数据库
开发平台:
Visual C++
- /* 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 */
- #ifndef ODBC_CODEGEN_Code_expr_const_hpp
- #define ODBC_CODEGEN_Code_expr_const_hpp
- #include <common/common.hpp>
- #include <common/DataField.hpp>
- #include "Code_expr.hpp"
- /**
- * @class Plan_expr_const
- * @brief Constant expression value in PlanTree
- */
- class Plan_expr_const : public Plan_expr {
- public:
- Plan_expr_const(Plan_root* root, LexType lexType, const char* value);
- virtual ~Plan_expr_const();
- Plan_base* analyze(Ctx& ctx, Ctl& ctl);
- Exec_base* codegen(Ctx& ctx, Ctl& ctl);
- void print(Ctx& ctx);
- bool isEqual(const Plan_expr* expr) const;
- bool isGroupBy(const Plan_expr_row* row) const;
- protected:
- // lexical type and token set by the parser
- LexType m_lexType;
- BaseString m_string;
- };
- inline
- Plan_expr_const::Plan_expr_const(Plan_root* root, LexType lexType, const char* value) :
- Plan_expr(root, TypeConst),
- m_lexType(lexType),
- m_string(value)
- {
- }
- /**
- * @class Exec_expr_const
- * @brief Constant expression value in ExecTree
- */
- class Exec_expr_const : public Exec_expr {
- public:
- class Code : public Exec_expr::Code {
- public:
- Code(const SqlField& sqlField);
- virtual ~Code();
- protected:
- friend class Exec_expr_const;
- const SqlField m_sqlField;
- };
- class Data : public Exec_expr::Data {
- public:
- Data(SqlField& sqlField);
- virtual ~Data();
- protected:
- friend class Exec_expr_const;
- SqlField m_sqlField;
- };
- Exec_expr_const(Exec_root* root);
- virtual ~Exec_expr_const();
- void alloc(Ctx& ctx, Ctl& ctl);
- void evaluate(Ctx& ctx, Ctl& ctl);
- void close(Ctx& ctx);
- void print(Ctx& ctx);
- // children
- const Code& getCode() const;
- Data& getData() const;
- };
- inline
- Exec_expr_const::Code::Code(const SqlField& sqlField) :
- Exec_expr::Code(m_sqlField.sqlSpec()),
- m_sqlField(sqlField)
- {
- }
- inline
- Exec_expr_const::Data::Data(SqlField& sqlField) :
- Exec_expr::Data(m_sqlField),
- m_sqlField(sqlField)
- {
- }
- inline
- Exec_expr_const::Exec_expr_const(Exec_root* root) :
- Exec_expr(root)
- {
- }
- // children
- inline const Exec_expr_const::Code&
- Exec_expr_const::getCode() const
- {
- const Code* code = static_cast<const Code*>(m_code);
- return *code;
- }
- inline Exec_expr_const::Data&
- Exec_expr_const::getData() const
- {
- Data* data = static_cast<Data*>(m_data);
- return *data;
- }
- #endif