00001 // database field base class -*- C++ -*- 00002 // $Id: field_base.h,v 1.1 2004/03/11 10:05:18 roger Exp $ 00003 // 00004 // Copyright (C) 2003 Roger Leigh <rleigh@debian.org> 00005 // 00006 // 00007 // All rights reserved. 00008 // 00009 // Redistribution and use in source and binary forms, with or without 00010 // modification, are permitted provided that the following conditions 00011 // are met: 00012 // 00013 // * Redistributions of source code must retain the above copyright 00014 // notice, this list of conditions and the following disclaimer. 00015 // * Redistributions in binary form must reproduce the above 00016 // copyright notice, this list of conditions and the following 00017 // disclaimer in the documentation and/or other materials provided 00018 // with the distribution. 00019 // * Neither the name of the author, nor the names of other 00020 // contributors may be used to endorse or promote products derived 00021 // from this software without specific prior written permission. 00022 // 00023 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 00024 // CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, 00025 // INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 00026 // MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 00027 // DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS 00028 // BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 00029 // EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED 00030 // TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 00031 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON 00032 // ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR 00033 // TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 00034 // THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 00035 // SUCH DAMAGE. 00036 // 00038 00039 #ifndef PQXX_OBJECT_FIELD_BASE_H 00040 #define PQXX_OBJECT_FIELD_BASE_H 00041 00042 #include <string> 00043 00044 #include <sigc++/object.h> 00045 #include <sigc++/signal.h> 00046 00047 namespace pqxxobject 00048 { 00068 class field_base : public SigC::Object 00069 { 00070 public: 00072 field_base(); 00073 00079 field_base(const std::string& column_name); 00080 00082 field_base(const field_base& rhs); 00083 00085 virtual ~field_base(); 00086 00093 field_base& operator = (const field_base& rhs); 00094 00099 const std::string& get_column_name() const; 00100 00105 void set_column_name(const std::string& column); 00106 00111 virtual bool is_null() const = 0; 00112 00117 virtual bool is_not_null() const = 0; 00118 00133 SigC::Signal0<void>& signal_changed(); 00134 00135 protected: 00137 std::string m_column_name; 00138 00140 SigC::Signal0<void> m_signal_changed; 00141 00142 }; // class field_base 00143 00144 00145 }; // namespace pqxxobject 00146 00147 #endif // PQXX_OBJECT_FIELD_BASE_H