145 lines
4.4 KiB
C++
145 lines
4.4 KiB
C++
/****************************************************************************
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**
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** https://www.qxorm.com/
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** Copyright (C) 2013 XDL Team (ic-east.com)
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**
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** This file is part of the QxOrm library
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**
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** This software is provided 'as-is', without any express or implied
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** warranty. In no event will the authors be held liable for any
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** damages arising from the use of this software
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**
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** Commercial Usage
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** Licensees holding valid commercial QxOrm licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and XDL Team
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3.0 as published by the Free Software
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** Foundation and appearing in the file 'license.gpl3.txt' included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU General Public License version 3.0 requirements will be
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** met : http://www.gnu.org/copyleft/gpl.html
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**
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** If you are unsure which license is appropriate for your use, or
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** if you have questions regarding the use of this file, please contact :
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** ic-east.com
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**
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****************************************************************************/
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#ifndef _QX_IS_VALID_PRIMARY_KEY_H_
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#define _QX_IS_VALID_PRIMARY_KEY_H_
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#ifdef _MSC_VER
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#pragma once
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#endif
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/*!
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* \file is_valid_primary_key.h
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* \author XDL Team
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* \ingroup QxTraits
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* \brief qx::trait::is_valid_primary_key<T>(const T & t) : return true if t can be a valid primary key to be inserted into a database, otherwise return false
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*/
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namespace qx
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{
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namespace trait
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{
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namespace detail
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{
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/*!
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* \ingroup QxTraits
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* \brief qx::trait::is_valid_primary_key<T>(const T & t) : return true if t can be a valid primary key to be inserted into a database, otherwise return false
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*/
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template <typename T>
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struct is_valid_primary_key
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{
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static inline bool get(const T &t)
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{
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Q_UNUSED(t);
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qAssert(false);
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return false;
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}
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};
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template <>
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struct is_valid_primary_key<short>
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{
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static inline bool get(const short &t) { return (t != 0); }
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};
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template <>
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struct is_valid_primary_key<int>
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{
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static inline bool get(const int &t) { return (t != 0); }
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};
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template <>
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struct is_valid_primary_key<long>
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{
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static inline bool get(const long &t) { return (t != 0); }
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};
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template <>
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struct is_valid_primary_key<long long>
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{
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static inline bool get(const long long &t) { return (t != 0); }
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};
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template <>
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struct is_valid_primary_key<QString>
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{
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static inline bool get(const QString &t) { return (!t.isEmpty()); }
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};
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template <>
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struct is_valid_primary_key<QByteArray>
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{
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static inline bool get(const QByteArray &t) { return (!t.isEmpty()); }
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};
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template <>
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struct is_valid_primary_key<std::string>
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{
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static inline bool get(const std::string &t) { return (!t.empty()); }
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};
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template <>
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struct is_valid_primary_key<std::wstring>
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{
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static inline bool get(const std::wstring &t) { return (!t.empty()); }
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};
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template <>
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struct is_valid_primary_key<QVariant>
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{
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static inline bool get(const QVariant &t)
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{
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if (t.type() == QVariant::ByteArray)
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{
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return qx::trait::detail::is_valid_primary_key<QByteArray>::get(t.toByteArray());
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}
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if (t.type() == QVariant::String)
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{
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return qx::trait::detail::is_valid_primary_key<QString>::get(t.toString());
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}
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return (!t.isNull() && (t.toLongLong() != 0));
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}
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};
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} // namespace detail
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template <typename T>
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inline bool is_valid_primary_key(const T &t)
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{
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return qx::trait::detail::is_valid_primary_key<T>::get(t);
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}
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} // namespace trait
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} // namespace qx
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#endif // _QX_IS_VALID_PRIMARY_KEY_H_
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