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/*
* Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
*
* 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; version 2 of the
* License.
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#ifndef _SQL_STATEMENT_DECOMPOSER_H_
#define _SQL_STATEMENT_DECOMPOSER_H_
#include "wbpublic_public_interface.h"
#include "sql_parser_base.h"
#include <boost/shared_ptr.hpp>
struct SelectItem;
typedef std::list<SelectItem> SelectItems;
struct FromItem;
typedef std::list<FromItem> FromItems;
struct WBPUBLICBACKEND_PUBLIC_FUNC SelectStatement
{
typedef boost::shared_ptr<SelectStatement> Ref;
Ref parent;
SelectItems select_items;
FromItems from_items;
};
WBPUBLICBACKEND_PUBLIC_FUNC std::ostream& operator << (std::ostream &os, SelectStatement &s);
struct WBPUBLICBACKEND_PUBLIC_FUNC SelectItem
{
SelectItem() : wildcard(false) {}
std::string schema;
std::string table;
std::string field;
std::string expr;
std::string alias;
bool wildcard;
std::string effective_alias() const;
std::string state_as_string() const;
};
struct WBPUBLICBACKEND_PUBLIC_FUNC FromItem
{
FromItem() {}
std::string schema;
std::string table;
std::string alias;
std::string subquery;
SelectStatement::Ref statement;
};
/**
* Defines interface to extract some information from provided SQL statement.
*
* @ingroup sqlparser
*/
class WBPUBLICBACKEND_PUBLIC_FUNC Sql_statement_decomposer : virtual public Sql_parser_base
{
public:
typedef boost::shared_ptr<Sql_statement_decomposer> Ref;
protected:
Sql_statement_decomposer(grt::GRT *grt);
public:
virtual int decompose_query(const std::string &sql, SelectStatement::Ref select_statement)= 0;
virtual int decompose_view(const std::string &ddl, SelectStatement::Ref select_statement)= 0;
virtual int decompose_view(db_ViewRef view, SelectStatement::Ref select_statement)= 0;
};
#endif // _SQL_STATEMENT_DECOMPOSER_H_
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