query_8h-source.html

FastDb是高效的内存数据库系统

00209     }
00210 <span class="preprocessor">#endif</span>
00211 <span class="preprocessor"></span>    dbQueryExpression&amp; operator,(dbQueryExpression <span class="keyword">const</span>&amp; expr) { 
00212         *last = <span class="keyword">new</span> dbQueryElement(dbQueryElement::qExpression, <span class="stringliteral">"("</span>);
00213         (*last)-&gt;next = expr.<a class="code" href="classdbQueryExpression.html#dbQueryExpressionr0">first</a>;
00214         last = expr.<a class="code" href="classdbQueryExpression.html#dbQueryExpressionr1">last</a>;
00215         *last = <span class="keyword">new</span> dbQueryElement(dbQueryElement::qExpression, <span class="stringliteral">")"</span>);
00216         last = &amp;(*last)-&gt;next;
00217         operand = <span class="keyword">false</span>;
00218         <span class="keywordflow">return</span> *<span class="keyword">this</span>;
00219     }
00220     dbQueryExpression&amp; operator,(dbComponent <span class="keyword">const</span>&amp; comp) { 
00221         add(dbQueryElement::qExpression, comp.<a class="code" href="classdbComponent.html#dbComponento0">structure</a>);
00222         <span class="keywordflow">if</span> (comp.<a class="code" href="classdbComponent.html#dbComponento1">field</a> != NULL) { 
00223             add(dbQueryElement::qExpression, <span class="stringliteral">"."</span>);
00224             add(dbQueryElement::qExpression, comp.<a class="code" href="classdbComponent.html#dbComponento1">field</a>);
00225         }
00226         operand = <span class="keyword">false</span>;
00227         <span class="keywordflow">return</span> *<span class="keyword">this</span>;
00228     }
00229     dbQueryExpression&amp; operator += (dbComponent <span class="keyword">const</span>&amp; comp) { 
00230         <span class="keywordflow">return</span> *<span class="keyword">this</span>,comp;
00231     }
00232     dbQueryExpression&amp; operator += (<span class="keywordtype">char</span> <span class="keyword">const</span>* ptr) { 
00233         <span class="keywordflow">return</span> add(dbQueryElement::qExpression, ptr);
00234     }
00235 <span class="preprocessor">#ifndef NO_MEMBER_TEMPLATES</span>
00236 <span class="preprocessor"></span>    <span class="keyword">template</span>&lt;<span class="keyword">class</span> T&gt;
00237     dbQueryExpression&amp; operator,(<a class="code" href="classdbReference.html">dbReference&lt;T&gt;</a> <span class="keyword">const</span>&amp; value) { 
00238         <span class="keywordflow">return</span> add(dbQueryElement::qVarReference, &amp;value, &amp;T::dbDescriptor);
00239     }
00240 
00241     <span class="keyword">template</span>&lt;<span class="keyword">class</span> T&gt;
00242     <span class="keyword">inline</span> dbQueryExpression&amp; operator,(<a class="code" href="classdbArray.html">dbArray</a>&lt; <a class="code" href="classdbReference.html">dbReference&lt;T&gt;</a> &gt; <span class="keyword">const</span>&amp; value) { 
00243         <span class="keywordflow">return</span> add(dbQueryElement::qVarArrayOfRef, &amp;value, 
00244                       &amp;T::dbDescriptor);
00245     }
00246 
00247     <span class="keyword">template</span>&lt;<span class="keyword">class</span> T&gt;
00248     <span class="keyword">inline</span> dbQueryExpression&amp; operator,(<a class="code" href="classdbArray.html">dbArray</a>&lt; <a class="code" href="classdbReference.html">dbReference&lt;T&gt;</a> &gt;<span class="keyword">const</span>* <span class="keyword">const</span>&amp; value) { 
00249         <span class="keywordflow">return</span> add(dbQueryElement::qVarArrayOfRefPtr, &amp;value, &amp;T::dbDescriptor);
00250     }
00251 <span class="preprocessor">#endif</span>
00252 <span class="preprocessor"></span>};
00253 
00254 <span class="keyword">class </span>dbOrderByNode;
00255 <span class="keyword">class </span>dbFollowByNode;
00256 
00257 
<a name="l00261"></a><a class="code" href="classdbCompiledQuery.html">00261</a> <span class="keyword">class </span>FASTDB_DLL_ENTRY dbCompiledQuery { 
00262   <span class="keyword">public</span>:
00263     dbExprNode*        tree;
00264     dbOrderByNode*     order;
00265     dbFollowByNode*    follow;
00266     <a class="code" href="classdbTableDescriptor.html">dbTableDescriptor</a>* table;
00267     <span class="keywordtype">int</span>                schemeVersion;
00268 
00269     <span class="keyword">enum</span> IteratorInit { 
00270         StartFromAny,
00271         StartFromFirst,
00272         StartFromLast,
00273         StartFromRef, 
00274         StartFromArray,
00275         StartFromArrayPtr
00276     };
00277     IteratorInit       startFrom;
00278     <span class="keywordtype">void</span> <span class="keyword">const</span>*        root;
00279 
00280     <span class="keywordtype">void</span> destroy();
00281 
00282     <span class="keywordtype">bool</span> compiled() { <span class="keywordflow">return</span> tree != NULL; }
00283 
00284     dbCompiledQuery() { 
00285         tree = NULL;
00286         order = NULL;
00287         follow = NULL;
00288         table = NULL;
00289         startFrom = StartFromAny;
00290     }
00291 };
00292 
<a name="l00297"></a><a class="code" href="classdbQuery.html">00297</a> <span class="keyword">class </span>FASTDB_DLL_ENTRY dbQuery : <span class="keyword">public</span> dbCompiledQuery { 
00298     <span class="keyword">friend</span> <span class="keyword">class </span>dbCompiler;
00299     <span class="keyword">friend</span> <span class="keyword">class </span><a class="code" href="classdbDatabase.html">dbDatabase</a>;
00300     <span class="keyword">friend</span> <span class="keyword">class </span>dbSubSql;
00301     <span class="keyword">friend</span> <span class="keyword">class </span>dbCLI;
00302   <span class="keyword">private</span>:
00303     dbMutex            mutex;
00304     dbQueryElement*    elements;
00305     dbQueryElement**   nextElement;
00306     <span class="keywordtype">bool</span>               operand;
00307     <span class="keywordtype">bool</span>               mutexLocked;
00308 
00309     <span class="comment">//</span>
00310     <span class="comment">// Prohibite query copying</span>
00311     <span class="comment">//</span>
00312     dbQuery(dbQuery <span class="keyword">const</span>&amp;) {} 
00313     dbQuery&amp; operator =(dbQuery <span class="keyword">const</span>&amp;) { <span class="keywordflow">return</span> *<span class="keyword">this</span>; }
00314 
00315   <span class="keyword">public</span>:
00316     <span class="keywordtype">int</span>                pos; <span class="comment">// position of condition in statement</span>
00317 
00318 
00319     <span class="keywordtype">char</span>* dump(<span class="keywordtype">char</span>* buf) { 
00320         <span class="keywordtype">char</span>* p = buf;
00321         <span class="keywordflow">for</span> (dbQueryElement* elem = elements; elem != NULL; elem = elem-&gt;<a class="code" href="classdbQueryElement.html#dbQueryElementr0">next</a>) { 
00322             p = elem-&gt;<a class="code" href="classdbQueryElement.html#dbQueryElementa4">dump</a>(p);
00323         }
00324         <span class="keywordflow">return</span> buf;
00325     }
00326 
00327     <span class="keywordtype">char</span>* dumpValues(<span class="keywordtype">char</span>* buf) { 
00328         <span class="keywordtype">char</span>* p = buf;
00329         <span class="keywordflow">for</span> (dbQueryElement* elem = elements; elem != NULL; elem = elem-&gt;<a class="code" href="classdbQueryElement.html#dbQueryElementr0">next</a>) { 
00330             p = elem-&gt;<a class="code" href="classdbQueryElement.html#dbQueryElementa5">dumpValues</a>(p);
00331         }
00332         <span class="keywordflow">return</span> buf;
00333     }
00334 
00335     dbQuery&amp; append(dbQueryElement::ElementType type, <span class="keywordtype">void</span> <span class="keyword">const</span>* ptr,
00336                     <a class="code" href="classdbTableDescriptor.html">dbTableDescriptor</a>* table = NULL) 
00337     { 
00338         nextElement = &amp;(*nextElement=<span class="keyword">new</span> dbQueryElement(type,ptr,table))-&gt;next;
00339         operand = (type == dbQueryElement::qExpression);
00340         <span class="keywordflow">return</span> *<span class="keyword">this</span>;
00341     }
00342 
00343     dbQuery&amp; reset();
00344 
00345     <span class="comment">//</span>
00346     <span class="comment">// Redefined operator = and , make it possible to specify query in the</span>
00347     <span class="comment">// following way:</span>
00348     <span class="comment">//         int x, y;</span>
00349     <span class="comment">//         dbDataTime dt;</span>
00350     <span class="comment">//         dbQuery q; </span>
00351     <span class="comment">//         dbCursor&lt;record&gt; cursor;</span>
00352     <span class="comment">//         q = "x=",x,"and y=",y,"and",dt == "date";</span>
00353     <span class="comment">//         for (x = 0; x &lt; max_x; x++) { </span>
00354     <span class="comment">//             for (y = 0; y &lt; max_y; y++) { </span>
00355     <span class="comment">//                 cursor.select(q);</span>
00356     <span class="comment">//                 ...</span>
00357     <span class="comment">//             }</span>
00358     <span class="comment">//         }</span>
00359 
00360     dbQuery&amp; add(dbQueryExpression <span class="keyword">const</span>&amp; expr); 
00361 
00362     dbQuery&amp; And(<span class="keywordtype">char</span> <span class="keyword">const</span>* str) { 
00363         <span class="keywordflow">if</span> (elements != NULL) { 
00364             append(dbQueryElement::qExpression, <span class="stringliteral">"and"</span>);
00365         }
00366         <span class="keywordflow">return</span> append(dbQueryElement::qExpression, str);
00367     }
00368 
00369     dbQuery&amp; Or(<span class="keywordtype">char</span> <span class="keyword">const</span>* str) { 
00370         <span class="keywordflow">if</span> (elements != NULL) { 
00371             append(dbQueryElement::qExpression, <span class="stringliteral">"or"</span>);
00372         }
00373         <span class="keywordflow">return</span> append(dbQueryElement::qExpression, str);
00374     }
00375 
00376     dbQuery&amp; add(<span class="keywordtype">char</span> <span class="keyword">const</span>* str) { 
00377         <span class="keywordflow">return</span> append(operand ? dbQueryElement::qVarString 
00378                       : dbQueryElement::qExpression, str);
00379     }
00380     dbQuery&amp; add(<span class="keywordtype">char</span> <span class="keyword">const</span>** str) { 
00381         <span class="keywordflow">return</span> append(dbQueryElement::qVarStringPtr, str);
00382     }
00383 <span class="preprocessor">#ifdef USE_STD_STRING</span>
00384 <span class="preprocessor"></span>    dbQuery&amp; add(std::string <span class="keyword">const</span>&amp; str) { 
00385         <span class="keywordflow">return</span> append(dbQueryElement::qVarStdString, &amp;str);
00386     }
00387     dbQuery&amp; operator,(std::string <span class="keyword">const</span>&amp; str) { <span class="keywordflow">return</span> add(str); }
00388 <span class="preprocessor">#endif</span>
00389 <span class="preprocessor"></span>    dbQuery&amp; add(<span class="keywordtype">char</span>** str) { 
00390         <span class="keywordflow">return</span> append(dbQueryElement::qVarStringPtr, str);
00391     }
00392     dbQuery&amp; add(int1 <span class="keyword">const</span>&amp; value) { 
00393         <span class="keywordflow">return</span> append(dbQueryElement::qVarInt1, &amp;value);
00394     }
00395     dbQuery&amp; add (int2 <span class="keyword">const</span>&amp; value) { 
00396         <span class="keywordflow">return</span> append(dbQueryElement::qVarInt2, &amp;value);
00397     }