set_variable_stmt.h

/* Copyright (c) 2021 OceanBase and/or its affiliates. All rights reserved.
miniob is licensed under Mulan PSL v2.
You can use this software according to the terms and conditions of the Mulan PSL v2.
You may obtain a copy of Mulan PSL v2 at:
         http://license.coscl.org.cn/MulanPSL2
THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
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MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
See the Mulan PSL v2 for more details. */

//
// Created by Wangyunlai on 2023/6/29.
//

#pragma once

#include <string>
#include <vector>

#include "sql/stmt/stmt.h"

/**
 * @brief SetVairable 语句，设置变量，当前是会话变量，但是只有会话变量，没有全局变量
 * @ingroup Statement
 */
class SetVariableStmt : public Stmt
{
public:
  SetVariableStmt(const SetVariable &set_variable) : set_variable_(set_variable)
  {}
  virtual ~SetVariableStmt() = default;

  StmtType type() const override { return StmtType::SET_VARIABLE; }

  const char *var_name() const { return set_variable_.name.c_str(); }
  const Value &var_value() const { return set_variable_.value; }
  
  static RC create(const SetVariable &set_variable, Stmt *&stmt)
  {
    /// 可以校验是否存在某个变量，但是这里忽略
    stmt = new SetVariableStmt(set_variable);
    return RC::SUCCESS;
  }

private:
  SetVariable set_variable_;
};