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QxOrm
1.2.3
C++ Object Relational Mapping library
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00001 /**************************************************************************** 00002 ** 00003 ** http://www.qxorm.com/ 00004 ** http://sourceforge.net/projects/qxorm/ 00005 ** Original file by Lionel Marty 00006 ** 00007 ** This file is part of the QxOrm library 00008 ** 00009 ** This software is provided 'as-is', without any express or implied 00010 ** warranty. In no event will the authors be held liable for any 00011 ** damages arising from the use of this software. 00012 ** 00013 ** GNU Lesser General Public License Usage 00014 ** This file must be used under the terms of the GNU Lesser 00015 ** General Public License version 2.1 as published by the Free Software 00016 ** Foundation and appearing in the file 'license.lgpl.txt' included in the 00017 ** packaging of this file. Please review the following information to 00018 ** ensure the GNU Lesser General Public License version 2.1 requirements 00019 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. 00020 ** 00021 ** If you have questions regarding the use of this file, please contact : 00022 ** contact@qxorm.com 00023 ** 00024 ****************************************************************************/ 00025 00026 #ifndef _QX_IS_VALID_PRIMARY_KEY_H_ 00027 #define _QX_IS_VALID_PRIMARY_KEY_H_ 00028 00029 #ifdef _MSC_VER 00030 #pragma once 00031 #endif 00032 00040 namespace qx { 00041 namespace trait { 00042 namespace detail { 00043 00048 template <typename T> 00049 struct is_valid_primary_key 00050 { static inline bool get(const T & t) { Q_UNUSED(t); qAssert(false); return false; } }; 00051 00052 template <> 00053 struct is_valid_primary_key<short> 00054 { static inline bool get(const short & t) { return (t != 0); } }; 00055 00056 template <> 00057 struct is_valid_primary_key<int> 00058 { static inline bool get(const int & t) { return (t != 0); } }; 00059 00060 template <> 00061 struct is_valid_primary_key<long> 00062 { static inline bool get(const long & t) { return (t != 0); } }; 00063 00064 template <> 00065 struct is_valid_primary_key<long long> 00066 { static inline bool get(const long long & t) { return (t != 0); } }; 00067 00068 template <> 00069 struct is_valid_primary_key<QString> 00070 { static inline bool get(const QString & t) { return (! t.isEmpty()); } }; 00071 00072 template <> 00073 struct is_valid_primary_key<std::string> 00074 { static inline bool get(const std::string & t) { return (! t.empty()); } }; 00075 00076 template <> 00077 struct is_valid_primary_key<std::wstring> 00078 { static inline bool get(const std::wstring & t) { return (! t.empty()); } }; 00079 00080 template <> 00081 struct is_valid_primary_key<QVariant> 00082 { static inline bool get(const QVariant & t) { return ((t.type() == QVariant::String) ? qx::trait::detail::is_valid_primary_key<QString>::get(t.toString()) : (! t.isNull() && (t.toLongLong() != 0))); } }; 00083 00084 } // namespace detail 00085 00086 template <typename T> 00087 inline bool is_valid_primary_key(const T & t) 00088 { return qx::trait::detail::is_valid_primary_key<T>::get(t); } 00089 00090 } // namespace trait 00091 } // namespace qx 00092 00093 #endif // _QX_IS_VALID_PRIMARY_KEY_H_