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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 _FIELD_H
#define _FIELD_H
#include "Define.h"
#include "Duration.h"
#include <array>
#include <string_view>
#include <vector>
namespace Acore::Types
{
template <typename T>
using is_chrono_v = std::enable_if_t<std::is_same_v<Milliseconds, T>
|| std::is_same_v<Seconds, T>
|| std::is_same_v<Minutes, T>
|| std::is_same_v<Hours, T>
|| std::is_same_v<Days, T>
|| std::is_same_v<Weeks, T>
|| std::is_same_v<Years, T>
|| std::is_same_v<Months, T>, T>;
}
using Binary = std::vector<uint8>;
enum class DatabaseFieldTypes : uint8
{
Null,
Int8,
Int16,
Int32,
Int64,
Float,
Double,
Decimal,
Date,
Binary
};
struct QueryResultFieldMetadata
{
std::string TableName{};
std::string TableAlias{};
std::string Name{};
std::string Alias{};
std::string TypeName{};
uint32 Index = 0;
DatabaseFieldTypes Type = DatabaseFieldTypes::Null;
};
/**
@class Field
@brief Class used to access individual fields of database query result
Guideline on field type matching:
| MySQL type | method to use |
|------------------------|-----------------------------------------|
| TINYINT | Get<bool>, Get<int8>, Get<uint8> |
| SMALLINT | Get<int16>, Get<uint16> |
| MEDIUMINT, INT | Get<int32>, Get<uint32> |
| BIGINT | Get<int64>, Get<uint64> |
| FLOAT | Get<float> |
| DOUBLE, DECIMAL | Get<double> |
| CHAR, VARCHAR, | Get<std::string>, Get<std::string_view> |
| TINYTEXT, MEDIUMTEXT, | Get<std::string>, Get<std::string_view> |
| TEXT, LONGTEXT | Get<std::string>, Get<std::string_view> |
| TINYBLOB, MEDIUMBLOB, | Get<Binary>, Get<std::string> |
| BLOB, LONGBLOB | Get<Binary>, Get<std::string> |
| BINARY, VARBINARY | Get<Binary> |
Return types of aggregate functions:
| Function | Type |
|----------|-------------------|
| MIN, MAX | Same as the field |
| SUM, AVG | DECIMAL |
| COUNT | BIGINT |
*/
class AC_DATABASE_API Field
{
friend class ResultSet;
friend class PreparedResultSet;
public:
Field();
~Field() = default;
[[nodiscard]] inline bool IsNull() const
{
return data.value == nullptr;
}
template<typename T>
inline std::enable_if_t<std::is_arithmetic_v<T>, T> Get() const
{
return GetData<T>();
}
template<typename T>
inline std::enable_if_t<std::is_same_v<std::string, T>, T> Get() const
{
return GetDataString();
}
template<typename T>
inline std::enable_if_t<std::is_same_v<std::string_view, T>, T> Get() const
{
return GetDataStringView();
}
template<typename T>
inline std::enable_if_t<std::is_same_v<Binary, T>, T> Get() const
{
return GetDataBinary();
}
template <typename T, std::size_t S>
inline std::enable_if_t<std::is_same_v<Binary, T>, std::array<uint8, S>> Get() const
{
std::array<uint8, S> buf = {};
GetBinarySizeChecked(buf.data(), S);
return buf;
}
template<typename T>
inline Acore::Types::is_chrono_v<T> Get(bool convertToUin32 = true) const
{
return convertToUin32 ? T(GetData<uint32>()) : T(GetData<uint64>());
}
DatabaseFieldTypes GetType() { return meta->Type; }
protected:
struct
{
char const* value; // Actual data in memory
uint32 length; // Length
bool raw; // Raw bytes? (Prepared statement or ad hoc)
} data;
void SetByteValue(char const* newValue, uint32 length);
void SetStructuredValue(char const* newValue, uint32 length);
[[nodiscard]] bool IsType(DatabaseFieldTypes type) const;
[[nodiscard]] bool IsNumeric() const;
private:
template<typename T>
T GetData() const;
std::string GetDataString() const;
std::string_view GetDataStringView() const;
Binary GetDataBinary() const;
QueryResultFieldMetadata const* meta;
void LogWrongType(std::string_view getter, std::string_view typeName) const;
void SetMetadata(QueryResultFieldMetadata const* fieldMeta);
void GetBinarySizeChecked(uint8* buf, std::size_t size) const;
};
#endif
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