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94 lines
3.0 KiB
C++
94 lines
3.0 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_LIKE_H
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#define SQLPP_LIKE_H
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#include <sstream>
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#include <sqlpp11/type_traits.h>
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#include <sqlpp11/detail/set.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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// The ValueType should be boolean, this is a hack because boolean is not fully defined when the compiler first gets here...
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template<typename ValueType, typename Operand, typename Pattern>
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struct like_t: public ValueType::_base_value_type::template operators<like_t<ValueType, Operand, Pattern>>
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{
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static_assert(is_text_t<Operand>::value, "Operand for like() has to be a text");
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static_assert(is_text_t<Pattern>::value, "Pattern for like() has to be a text");
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struct _value_type: public ValueType::_base_value_type // we requite fully defined boolean here
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{
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using _is_named_expression = std::true_type;
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};
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struct _name_t
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{
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static constexpr const char* _get_name() { return "LIKE"; }
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template<typename T>
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struct _member_t
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{
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T like;
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};
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};
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like_t(Operand&& operand, Pattern&& pattern):
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_operand(std::move(operand)),
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_pattern(std::move(pattern))
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{}
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like_t(const Operand& operand, const Pattern& pattern):
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_operand(operand),
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_pattern(pattern)
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{}
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like_t(const like_t&) = default;
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like_t(like_t&&) = default;
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like_t& operator=(const like_t&) = default;
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like_t& operator=(like_t&&) = default;
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~like_t() = default;
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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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static_assert(Db::_supports_like, "like() not supported by current database");
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_operand.serialize(os, db);
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os << " LIKE(";
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_pattern.serialize(os, db);
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os << ")";
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}
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private:
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Operand _operand;
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Pattern _pattern;
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};
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}
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}
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#endif
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