command_result_set.hpp

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#pragma once
 
/// @file userver/storages/mysql/command_result_set.hpp
 
#include <string>
 
#include <userver/utils/fast_pimpl.hpp>
 
USERVER_NAMESPACE_BEGIN
 
namespace storages::mysql {
 
namespace impl {
class QueryResult;
}
 
/// @brief A wrapper for command result set.
///
/// This type can't be constructed in user code and is always retrieved from
/// storages::mysql::Cluster.
///
/// This class doesn't come with much functionality, reach for prepared
/// statements interface of the storages::mysql::Cluster if you want some.
class CommandResultSet final {
public:
    explicit CommandResultSet(impl::QueryResult&& mysql_result);
    ~CommandResultSet();
 
    CommandResultSet(const CommandResultSet& other) = delete;
    CommandResultSet(CommandResultSet&& other) noexcept;
 
    /// @brief Returns amount of rows in the result set.
    std::size_t RowsCount() const;
 
    /// @brief Returns amount of columns in the result set.
    std::size_t FieldsCount() const;
 
    /// @brief Return true if there are any rows in the result set,
    /// false otherwise.
    bool Empty() const;
 
    /// @brief Returns a value at row `row` at column `column`.
    const std::string& At(std::size_t row, std::size_t column) const;
 
    /// @brief Returns a value at row `row` at column `column`.
    std::string& At(std::size_t row, std::size_t column);
 
private:
    class Impl;
    utils::FastPimpl<Impl, 24, 8> impl_;
};
 
}  // namespace storages::mysql
 
USERVER_NAMESPACE_END