77 lines
2.8 KiB
C++
77 lines
2.8 KiB
C++
/*------------------------------------------------------------------------------*
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* Architecture & Implementation of DBMS *
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*------------------------------------------------------------------------------*
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* Copyright 2022 Databases and Information Systems Group TU Dortmund *
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* Visit us at *
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* http://dbis.cs.tu-dortmund.de/cms/en/home/ *
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* *
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, *
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL *
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR *
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, *
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR *
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* OTHER DEALINGS IN THE SOFTWARE. *
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* *
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* Authors: *
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* Maximilian Berens <maximilian.berens@tu-dortmund.de> *
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* Roland Kühn <roland.kuehn@cs.tu-dortmund.de> *
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* Jan Mühlig <jan.muehlig@tu-dortmund.de> *
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*------------------------------------------------------------------------------*
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*/
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#pragma once
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#include "execution_callback.h"
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#include <cstddef>
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#include <string>
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#include <table/schema.h>
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#include <table/tuple.h>
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#include <vector>
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namespace beedb::io
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{
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/**
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* Results of queries are serialized as follows:
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* - First 2 bytes: Number of columns
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* - For every column:
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* - the type (table::Type)
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* - the offset (std::size_t)
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* - the column order index (std::uint16_t)
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* - the null-terminated name of the column
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* - After the schema, the bytes of the tuples will serialized.
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*/
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class QueryResultSerializer
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{
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public:
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QueryResultSerializer();
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~QueryResultSerializer();
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void serialize(const table::Schema &schema);
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void serialize(const table::Tuple &tuple);
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[[nodiscard]] std::byte *data()
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{
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return _data;
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}
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[[nodiscard]] std::size_t size() const
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{
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return _size;
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}
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[[nodiscard]] bool empty() const
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{
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return _size == 0u;
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}
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private:
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std::byte *_data = nullptr;
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std::size_t _size = 0u;
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std::size_t _capacity = 0u;
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void append(const std::byte *data, const std::uint16_t size);
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void prepend(const std::byte *data, const std::uint16_t size);
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void allocate(const std::size_t capacity);
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};
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} // namespace beedb::io
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