mirror of
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134 lines
3.9 KiB
C++
134 lines
3.9 KiB
C++
/*
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* Copyright (c) 2013, Roland Bock
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice, this
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* list of conditions and the following disclaimer in the documentation and/or
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* other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef SQLPP_TEXT_H
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#define SQLPP_TEXT_H
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#include <cstdlib>
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#include <sqlpp11/detail/basic_operators.h>
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#include <sqlpp11/type_traits.h>
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#include <sqlpp11/raw_result_row.h>
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#include <sqlpp11/exception.h>
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#include <sqlpp11/concat.h>
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#include <sqlpp11/like.h>
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namespace sqlpp
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{
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namespace detail
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{
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// text value type
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struct text
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{
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using _base_value_type = text;
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using _is_text = tag_yes;
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using _is_value = tag_yes;
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using _is_expression = tag_yes;
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template<size_t index>
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struct _result_entry_t
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{
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_result_entry_t(const raw_result_row_t& row):
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_is_valid(row.data != nullptr),
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_is_null(row.data == nullptr or row.data[index] == nullptr),
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_value(_is_null ? "" : std::string(row.data[index], row.data[index] + row.len[index]))
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{}
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_result_entry_t& operator=(const raw_result_row_t& row)
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{
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_is_valid = (row.data != nullptr);
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_is_null = row.data == nullptr or row.data[index] == nullptr;
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_value = _is_null ? "" : std::string(row.data[index], row.data[index] + row.len[index]);
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return *this;
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}
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template<typename Db>
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void serialize(std::ostream& os, Db& db) const
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{
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os << value();
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}
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bool _is_trivial() const { return value().empty(); }
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bool operator==(const std::string& rhs) const { return value() == rhs; }
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bool operator!=(const std::string& rhs) const { return not operator==(rhs); }
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bool is_null() const
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{
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if (not _is_valid)
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throw exception("accessing is_null in non-existing row");
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return _is_null;
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}
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std::string value() const
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{
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if (not _is_valid)
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throw exception("accessing value in non-existing row");
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return _value;
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}
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operator std::string() const { return value(); }
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private:
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bool _is_valid;
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bool _is_null;
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std::string _value;
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};
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template<typename T>
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using _constraint = operand_t<T, is_text_t>;
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template<typename Base>
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struct operators: public basic_operators<Base, _constraint>
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{
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template<typename T>
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detail::concat_t<Base, typename _constraint<T>::type> operator+(T&& t) const
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{
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return { *static_cast<const Base*>(this), std::forward<T>(t) };
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}
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template<typename T>
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detail::like_t<Base, typename _constraint<T>::type> like(T&& t) const
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{
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return { *static_cast<const Base*>(this), std::forward<T>(t) };
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}
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};
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};
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template<size_t index>
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std::ostream& operator<<(std::ostream& os, const text::_result_entry_t<index>& e)
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{
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return os << e.value();
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}
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}
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using text = detail::text;
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using varchar = detail::text;
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using char_ = detail::text;
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}
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#endif
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