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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1"><title>reference.h Source File</title><link href="doxygen.css" rel="stylesheet" type="text/css"></head><body><!-- Generated by Doxygen 1.2.18 --><center><a class="qindex" href="index.html">Main Page</a> <a class="qindex" href="hierarchy.html">Class Hierarchy</a> <a class="qindex" href="annotated.html">Compound List</a> <a class="qindex" href="files.html">File List</a> <a class="qindex" href="functions.html">Compound Members</a> </center><hr><h1>reference.h</h1><div class="fragment"><pre>00001 <span class="comment">//-< REFERENCE.H >---------------------------------------------------*--------*</span>00002 <span class="comment">// FastDB Version 1.0 (c) 1999 GARRET * ? *</span>00003 <span class="comment">// (Main Memory Database Management System) * /\| *</span>00004 <span class="comment">// * / \ *</span>00005 <span class="comment">// Created: 20-Nov-98 K.A. Knizhnik * / [] \ *</span>00006 <span class="comment">// Last update: 15-Feb-99 K.A. Knizhnik * GARRET *</span>00007 <span class="comment">//-------------------------------------------------------------------*--------*</span>00008 <span class="comment">// Database table field reference type</span>00009 <span class="comment">//-------------------------------------------------------------------*--------*</span>00010 00011 <span class="preprocessor">#ifndef __REFERENCE_H__</span>00012 <span class="preprocessor"></span><span class="preprocessor">#define __REFERENCE_H__</span>00013 <span class="preprocessor"></span>00014 BEGIN_FASTDB_NAMESPACE00015 <a name="l00019"></a><a class="code" href="classdbAnyReference.html">00019</a> <span class="keyword">class </span>FASTDB_DLL_ENTRY <a class="code" href="classdbAnyReference.html">dbAnyReference</a> { 00020 <span class="keyword">friend</span> <span class="keyword">class </span><a class="code" href="classdbAnyCursor.html">dbAnyCursor</a>;00021 <span class="keyword">friend</span> <span class="keyword">class </span><a class="code" href="classdbDatabase.html">dbDatabase</a>;00022 <span class="keyword">friend</span> <span class="keyword">class </span><a class="code" href="classdbFieldDescriptor.html">dbFieldDescriptor</a>;00023 <span class="keyword">protected</span>:00024 oid_t oid;00025 00026 <span class="keyword">public</span>: 00027 <a class="code" href="classdbAnyReference.html">dbAnyReference</a>(oid_t oid = 0) { 00028 this->oid = oid;00029 }<a name="l00034"></a><a class="code" href="classdbAnyReference.html#dbReferencea11">00034</a> oid_t getOid()<span class="keyword"> const </span>{ 00035 <span class="keywordflow">return</span> oid;00036 }00037 <a name="l00041"></a><a class="code" href="classdbAnyReference.html#dbReferencel0">00041</a> <span class="keyword">friend</span> <span class="keywordtype">bool</span> isNull(<a class="code" href="classdbAnyReference.html">dbAnyReference</a> <span class="keyword">const</span>& ref) { 00042 <span class="keywordflow">return</span> ref.<a class="code" href="classdbAnyReference.html#dbReferencen0">oid</a> == 0; 00043 }00044 <a name="l00048"></a><a class="code" href="classdbAnyReference.html#dbReferencea12">00048</a> <span class="keywordtype">bool</span> isNull()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> oid == 0; }00049 00050 <a class="code" href="classdbFieldDescriptor.html">dbFieldDescriptor</a>* dbDescribeComponents(<a class="code" href="classdbFieldDescriptor.html">dbFieldDescriptor</a>* fd) {00051 fd-><a class="code" href="classdbFieldDescriptor.html#dbFieldDescriptorm14">type</a> = fd-><a class="code" href="classdbFieldDescriptor.html#dbFieldDescriptorm15">appType</a> = dbField::tpReference;00052 fd-><a class="code" href="classdbFieldDescriptor.html#dbFieldDescriptorm10">refTable</a> = NULL;00053 fd-><a class="code" href="classdbFieldDescriptor.html#dbFieldDescriptorm22">dbsSize</a> = fd-><a class="code" href="classdbFieldDescriptor.html#dbFieldDescriptorm24">alignment</a> = <span class="keyword">sizeof</span>(oid_t);00054 <span class="keywordflow">return</span> NULL;00055 }00056 };00057 <a name="l00061"></a><a class="code" href="classdbNullReference.html">00061</a> <span class="keyword">class </span>FASTDB_DLL_ENTRY dbNullReference {};00062 00066 <span class="keyword">extern</span> FASTDB_DLL_ENTRY dbNullReference null;00067 00068 <span class="preprocessor">#if (defined(_MSC_VER) && (_MSC_VER+0 < 1200 || _MSC_VER >= 1310)) || defined(__MWERKS__)</span>00069 <span class="preprocessor"></span><span class="comment">//</span>00070 <span class="comment">// Visual C++ prior to 5.0 version (with applied Service Pack 3)</span>00071 <span class="comment">// didn't support lazy template instantiation. As far as VC has bug</span>00072 <span class="comment">// with treating local function prototypes, we have to use friend function.</span>00073 <span class="comment">//</span>00074 <span class="keyword">template</span><<span class="keyword">class</span> T>00075 <span class="keyword">extern</span> <a class="code" href="classdbTableDescriptor.html">dbTableDescriptor</a>* dbGetTableDescriptor(T*);00076 <span class="preprocessor">#endif</span>00077 <span class="preprocessor"></span>00078 00082 <span class="keyword">template</span><<span class="keyword">class</span> T><a name="l00083"></a><a class="code" href="classdbReference.html">00083</a> <span class="keyword">class </span><a class="code" href="classdbReference.html">dbReference</a> : <span class="keyword">public</span> <a class="code" href="classdbAnyReference.html">dbAnyReference</a> { 00084 <span class="keyword">public</span>:<a name="l00088"></a><a class="code" href="classdbReference.html#dbReferencea0">00088</a> <a class="code" href="classdbFieldDescriptor.html">dbFieldDescriptor</a>* <a class="code" href="classdbReference.html#dbReferencea0">dbDescribeComponents</a>(<a class="code" href="classdbFieldDescriptor.html">dbFieldDescriptor</a>* fd) { 00089 fd-><a class="code" href="classdbFieldDescriptor.html#dbFieldDescriptorm14">type</a> = fd-><a class="code" href="classdbFieldDescriptor.html#dbFieldDescriptorm15">appType</a> = dbField::tpReference;00090 <span class="preprocessor">#if defined(_MSC_VER) && (_MSC_VER+0 < 1200 || _MSC_VER >= 1310) || defined(__MWERKS__)</span>00091 <span class="preprocessor"></span> fd-><a class="code" href="classdbFieldDescriptor.html#dbFieldDescriptorm10">refTable</a> = dbGetTableDescriptor((T*)0);00092 <span class="preprocessor">#else</span>00093 <span class="preprocessor"></span><span class="preprocessor">#if GNUC_BEFORE(2,96) || defined(__VACPP_MULTI__) || defined(__IBMCPP__)</span>00094 <span class="preprocessor"></span> <span class="keyword">extern</span> <a class="code" href="classdbTableDescriptor.html">dbTableDescriptor</a>* dbGetTableDescriptor(T*);00095 fd-><a class="code" href="classdbFieldDescriptor.html#dbFieldDescriptorm10">refTable</a> = dbGetTableDescriptor((T*)0);00096 <span class="preprocessor">#else</span>00097 <span class="preprocessor"></span> fd-><a class="code" href="classdbFieldDescriptor.html#dbFieldDescriptorm10">refTable</a> = &T::dbDescriptor;00098 <span class="preprocessor">#endif</span>00099 <span class="preprocessor"></span><span class="preprocessor">#endif</span>00100 <span class="preprocessor"></span> fd-><a class="code" href="classdbFieldDescriptor.html#dbFieldDescriptorm22">dbsSize</a> = fd-><a class="code" href="classdbFieldDescriptor.html#dbFieldDescriptorm24">alignment</a> = <span class="keyword">sizeof</span>(oid_t);00101 <span class="keywordflow">return</span> NULL;00102 }00103 <a name="l00109"></a><a class="code" href="classdbReference.html#dbReferencea1">00109</a> <a class="code" href="classdbReference.html">dbReference</a>& <a class="code" href="classdbReference.html#dbReferencea1">operator = </a>(<a class="code" href="classdbReference.html">dbReference</a> <span class="keyword">const</span>& ref) { 00110 oid = ref.<a class="code" href="classdbAnyReference.html#dbReferencen0">oid</a>;00111 <span class="keywordflow">return</span> *<span class="keyword">this</span>;00112 }00113 <a name="l00118"></a><a class="code" href="classdbReference.html#dbReferencea2">00118</a> <a class="code" href="classdbReference.html">dbReference</a>& <a class="code" href="classdbReference.html#dbReferencea1">operator = </a>(dbNullReference <span class="keyword">const</span>&) { 00119 oid = 0;00120 <span class="keywordflow">return</span> *<span class="keyword">this</span>;00121 }00122 <a name="l00128"></a><a class="code" href="classdbReference.html#dbReferencea3">00128</a> <a class="code" href="classdbReference.html">dbReference<T></a>& <a class="code" href="classdbReference.html#dbReferencea3">unsafeAssign</a>(<a class="code" href="classdbAnyReference.html">dbAnyReference</a> <span class="keyword">const</span>& ref) {00129 oid = ref.<a class="code" href="classdbAnyReference.html#dbReferencea11">getOid</a>();00130 <span class="keywordflow">return</span> *<span class="keyword">this</span>;00131 }00132 <a name="l00136"></a><a class="code" href="classdbReference.html#dbReferencea4">00136</a> <span class="keywordtype">bool</span> <a class="code" href="classdbReference.html#dbReferencea4">operator == </a>(<a class="code" href="classdbReference.html">dbReference</a> <span class="keyword">const</span>& ref)<span class="keyword"> const </span>{ 00137 <span class="keywordflow">return</span> oid == ref.<a class="code" href="classdbAnyReference.html#dbReferencen0">oid</a>; 00138 }00139 <a name="l00143"></a><a class="code" href="classdbReference.html#dbReferencea5">00143</a> <span class="keywordtype">bool</span> <a class="code" href="classdbReference.html#dbReferencea5">operator != </a>(<a class="code" href="classdbReference.html">dbReference</a> <span class="keyword">const</span>& ref)<span class="keyword"> const </span>{ 00144 <span class="keywordflow">return</span> oid != ref.<a class="code" href="classdbAnyReference.html#dbReferencen0">oid</a>; 00145 }00146 <a name="l00150"></a><a class="code" href="classdbReference.html#dbReferencea6">00150</a> <span class="keywordtype">bool</span> <a class="code" href="classdbReference.html#dbReferencea4">operator == </a>(dbNullReference <span class="keyword">const</span>&)<span class="keyword"> const </span>{ 00151 <span class="keywordflow">return</span> oid == 0;00152 }00153 <a name="l00157"></a><a class="code" href="classdbReference.html#dbReferencea7">00157</a> <span class="keywordtype">bool</span> <a class="code" href="classdbReference.html#dbReferencea5">operator != </a>(dbNullReference <span class="keyword">const</span>&)<span class="keyword"> const </span>{ 00158 <span class="keywordflow">return</span> oid != 0;00159 }00160 <a name="l00164"></a><a class="code" href="classdbReference.html#dbReferencea8">00164</a> <a class="code" href="classdbReference.html#dbReferencea8">dbReference</a>(dbNullReference <span class="keyword">const</span>&) : <a class="code" href="classdbAnyReference.html">dbAnyReference</a>(0) {}00165 <a name="l00169"></a><a class="code" href="classdbReference.html#dbReferencea9">00169</a> <a class="code" href="classdbReference.html#dbReferencea8">dbReference</a>(<a class="code" href="classdbReference.html">dbReference</a> <span class="keyword">const</span>& ref) : <a class="code" href="classdbAnyReference.html">dbAnyReference</a>(ref.oid) {}00170 <a name="l00177"></a><a class="code" href="classdbReference.html#dbReferencea10">00177</a> <a class="code" href="classdbReference.html#dbReferencea8">dbReference</a>(oid_t oid=0) : <a class="code" href="classdbAnyReference.html">dbAnyReference</a>(oid) {}00178 };00179 00180 END_FASTDB_NAMESPACE00181 00182 <span class="preprocessor">#endif</span>00183 <span class="preprocessor"></span>00184 00185 00186 00187 </pre></div><hr><address style="align: right;"><small>Generated on Mon Oct 23 13:23:58 2006 for FastDB by<a href="http://www.doxygen.org/index.html"><img src="doxygen.png" alt="doxygen" align="middle" border=0 width=110 height=53></a>1.2.18 </small></address></body></html>⌨️ 快捷键说明
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