database_interface.h

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// BSD 3-Clause License
// Copyright (c) 2025, 🍀☀🌕🌥 🌊
// See the LICENSE file in the project root for full license information.
 
#pragma once
 
#include <cstdint>
#include <map>
#include <string>
#include <variant>
#include <vector>
 
#include "../patterns/result.h"
 
namespace kcenon::common {
 
struct database_null {};
 
using database_value = std::variant<database_null, std::string, std::int64_t, double, bool>;
 
using database_row = std::map<std::string, database_value>;
 
using database_result = std::vector<database_row>;
 
namespace interfaces {
 
class IDatabase {
public:
    virtual ~IDatabase() = default;
 
    virtual VoidResult connect(const std::string& connection_string) = 0;
 
    virtual VoidResult disconnect() = 0;
 
    virtual Result<database_result> execute_query(const std::string& query) = 0;
 
    virtual VoidResult execute_command(const std::string& command) = 0;
 
    virtual VoidResult begin_transaction() = 0;
 
    virtual VoidResult commit() = 0;
 
    virtual VoidResult rollback() = 0;
 
    virtual bool is_connected() const = 0;
};
 
} // namespace interfaces
} // namespace kcenon::common