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/*
* This file is part of the AzerothCore Project. See AUTHORS file for Copyright information
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Affero General Public License as published by the
* Free Software Foundation; either version 3 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 Affero General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef QUERYRESULT_H
#define QUERYRESULT_H
#include "DatabaseEnvFwd.h"
#include "Define.h"
#include "Field.h"
#include <tuple>
#include <vector>
template<typename T>
struct ResultIterator
{
using iterator_category = std::forward_iterator_tag;
using difference_type = std::ptrdiff_t;
using value_type = T;
using pointer = T*;
using reference = T&;
explicit ResultIterator(pointer ptr) : _ptr(ptr) { }
reference operator*() const { return *_ptr; }
pointer operator->() { return _ptr; }
ResultIterator& operator++() { if (!_ptr->NextRow()) _ptr = nullptr; return *this; }
bool operator!=(const ResultIterator& right) { return _ptr != right._ptr; }
private:
pointer _ptr;
};
class AC_DATABASE_API ResultSet
{
public:
ResultSet(MySQLResult* result, MySQLField* fields, uint64 rowCount, uint32 fieldCount);
~ResultSet();
bool NextRow();
[[nodiscard]] uint64 GetRowCount() const { return _rowCount; }
[[nodiscard]] uint32 GetFieldCount() const { return _fieldCount; }
[[nodiscard]] std::string GetFieldName(uint32 index) const;
[[nodiscard]] Field* Fetch() const { return _currentRow; }
Field const& operator[](std::size_t index) const;
template<typename... Ts>
inline std::tuple<Ts...> FetchTuple()
{
AssertRows(sizeof...(Ts));
std::tuple<Ts...> theTuple = {};
std::apply([this](Ts&... args)
{
uint8 index{ 0 };
((args = _currentRow[index].Get<Ts>(), index++), ...);
}, theTuple);
return theTuple;
}
auto begin() { return ResultIterator<ResultSet>(this); }
static auto end() { return ResultIterator<ResultSet>(nullptr); }
protected:
std::vector<QueryResultFieldMetadata> _fieldMetadata;
uint64 _rowCount;
Field* _currentRow;
uint32 _fieldCount;
private:
void CleanUp();
void AssertRows(std::size_t sizeRows);
MySQLResult* _result;
MySQLField* _fields;
ResultSet(ResultSet const& right) = delete;
ResultSet& operator=(ResultSet const& right) = delete;
};
class AC_DATABASE_API PreparedResultSet
{
public:
PreparedResultSet(MySQLStmt* stmt, MySQLResult* result, uint64 rowCount, uint32 fieldCount);
~PreparedResultSet();
bool NextRow();
[[nodiscard]] uint64 GetRowCount() const { return m_rowCount; }
[[nodiscard]] uint32 GetFieldCount() const { return m_fieldCount; }
[[nodiscard]] Field* Fetch() const;
Field const& operator[](std::size_t index) const;
template<typename... Ts>
inline std::tuple<Ts...> FetchTuple()
{
AssertRows(sizeof...(Ts));
std::tuple<Ts...> theTuple = {};
std::apply([this](Ts&... args)
{
uint8 index{ 0 };
((args = m_rows[uint32(m_rowPosition) * m_fieldCount + index].Get<Ts>(), index++), ...);
}, theTuple);
return theTuple;
}
auto begin() { return ResultIterator<PreparedResultSet>(this); }
static auto end() { return ResultIterator<PreparedResultSet>(nullptr); }
protected:
std::vector<QueryResultFieldMetadata> m_fieldMetadata;
std::vector<Field> m_rows;
uint64 m_rowCount;
uint64 m_rowPosition;
uint32 m_fieldCount;
private:
MySQLBind* m_rBind;
MySQLStmt* m_stmt;
MySQLResult* m_metadataResult; ///< Field metadata, returned by mysql_stmt_result_metadata
void CleanUp();
bool _NextRow();
void AssertRows(std::size_t sizeRows);
PreparedResultSet(PreparedResultSet const& right) = delete;
PreparedResultSet& operator=(PreparedResultSet const& right) = delete;
};
#endif
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