mirror of
https://github.com/rbock/sqlpp11.git
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254 lines
6.3 KiB
C++
254 lines
6.3 KiB
C++
/*
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* Copyright (c) 2013-2014, 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 <sqlpp11/basic_expression_operators.h>
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#include <sqlpp11/type_traits.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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#include <sqlpp11/result_field.h>
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namespace sqlpp
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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 _traits = make_traits<text, ::sqlpp::tag::is_text, ::sqlpp::tag::is_value_type>;
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using _tag = ::sqlpp::tag::is_text;
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using _cpp_value_type = std::string;
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struct _parameter_t
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{
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using _value_type = text;
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_parameter_t():
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_value(""),
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_is_null(true)
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{}
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_parameter_t(const _cpp_value_type& value):
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_value(value),
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_is_null(false)
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{}
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_parameter_t& operator=(const _cpp_value_type& value)
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{
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_value = value;
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_is_null = false;
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return *this;
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}
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_parameter_t& operator=(const std::nullptr_t&)
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{
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_value = "";
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_is_null = true;
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return *this;
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}
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bool is_null() const
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{
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return _is_null;
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}
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_cpp_value_type value() const
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{
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return _value;
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}
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operator _cpp_value_type() const { return value(); }
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template<typename Target>
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void _bind(Target& target, size_t index) const
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{
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target._bind_text_parameter(index, &_value, _is_null);
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}
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private:
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_cpp_value_type _value;
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bool _is_null;
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};
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template<typename T>
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struct _is_valid_operand
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{
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static constexpr bool value =
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is_expression_t<T>::value // expressions are OK
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and is_text_t<T>::value // the correct value type is required, of course
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;
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};
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template<typename Base>
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struct expression_operators: public basic_expression_operators<Base, is_text_t>
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{
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template<typename T>
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concat_t<Base, wrap_operand_t<T>> operator+(T t) const
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{
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using rhs = wrap_operand_t<T>;
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static_assert(_is_valid_operand<rhs>::value, "invalid rhs operand");
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return { *static_cast<const Base*>(this), {t} };
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}
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template<typename T>
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like_t<Base, wrap_operand_t<T>> like(T t) const
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{
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using rhs = wrap_operand_t<T>;
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static_assert(_is_valid_operand<rhs>::value, "invalid argument for like()");
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return { *static_cast<const Base*>(this), {t} };
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}
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};
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template<typename Base>
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struct column_operators
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{
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template<typename T>
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auto operator +=(T t) const -> assignment_t<Base, concat_t<Base, wrap_operand_t<T>>>
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{
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using rhs = wrap_operand_t<T>;
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static_assert(_is_valid_operand<rhs>::value, "invalid rhs assignment operand");
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return { *static_cast<const Base*>(this), { *static_cast<const Base*>(this), rhs{t} } };
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}
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};
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};
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template<typename Db, typename FieldSpec>
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struct result_field_t<text, Db, FieldSpec>: public result_field_methods_t<result_field_t<text, Db, FieldSpec>>
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{
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static_assert(std::is_same<value_type_of<FieldSpec>, text>::value, "field type mismatch");
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using _cpp_value_type = typename text::_cpp_value_type;
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result_field_t():
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_is_valid(false),
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_value_ptr(nullptr),
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_len(0)
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{}
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void _validate()
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{
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_is_valid = true;
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}
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void _invalidate()
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{
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_is_valid = false;
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_value_ptr = nullptr;
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_len = 0;
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}
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bool operator==(const _cpp_value_type& rhs) const { return value() == rhs; }
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bool operator!=(const _cpp_value_type& 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 _value_ptr == nullptr;
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}
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bool _is_trivial() 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 value() == "";
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}
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_cpp_value_type 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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if (not _value_ptr)
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{
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if (enforce_null_result_treatment_t<Db>::value and not null_is_trivial_value_t<FieldSpec>::value)
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{
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throw exception("accessing value of NULL field");
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}
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else
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{
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return "";
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}
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}
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return std::string(_value_ptr, _value_ptr + _len);
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}
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template<typename Target>
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void _bind(Target& target, size_t i)
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{
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target._bind_text_result(i, &_value_ptr, &_len);
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}
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private:
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bool _is_valid;
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const char* _value_ptr;
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size_t _len;
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};
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template<typename Context, typename Db, typename FieldSpec>
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struct serializer_t<Context, result_field_t<text, Db, FieldSpec>>
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{
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using T = result_field_t<text, Db, FieldSpec>;
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static Context& _(const T& t, Context& context)
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{
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if (t.is_null() and not null_is_trivial_value_t<T>::value)
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{
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context << "NULL";
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}
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else
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{
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context << '\'' << context.escape(t.value()) << '\'';
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}
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return context;
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}
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};
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template<typename Db, typename FieldSpec>
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inline std::ostream& operator<<(std::ostream& os, const result_field_t<text, Db, FieldSpec>& e)
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{
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if (e.is_null() and not null_is_trivial_value_t<FieldSpec>::value)
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{
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return os << "NULL";
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}
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else
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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 blob = text;
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using varchar = text;
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using char_ = text;
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}
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#endif
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