cursor_8h-source.html

俄罗斯牛人KK的作品,著名的ORDBMS,这里上传最新的3.39版本源代码.希望了解对象关系数据库的同好,请不要错过.

00236         reset();
00237     }
00238 
00242     <span class="keywordtype">void</span> removeAllSelected();
00243 
<a name="l00247"></a><a class="code" href="classdbAnyCursor.html#dbCursor_3_01dbTimeSeriesBlock_3_01T_01_4_01_4a33">00247</a>     <span class="keywordtype">void</span> setSelectionLimit(size_t lim) { limit = lim; }
00248     
<a name="l00252"></a><a class="code" href="classdbAnyCursor.html#dbCursor_3_01dbTimeSeriesBlock_3_01T_01_4_01_4a34">00252</a>     <span class="keywordtype">void</span> unsetSelectionLimit() { limit = dbDefaultSelectionLimit; }
00253 
<a name="l00260"></a><a class="code" href="classdbAnyCursor.html#dbCursor_3_01dbTimeSeriesBlock_3_01T_01_4_01_4a35">00260</a>     <span class="keywordtype">void</span> setPrefetchMode(<span class="keywordtype">bool</span> mode) { prefetch = mode; }
00261 
00265     <span class="keywordtype">void</span> reset();
00266 
00271     <span class="keywordtype">bool</span> isLast() <span class="keyword">const</span>; 
00272 
00277     <span class="keywordtype">bool</span> isFirst() <span class="keyword">const</span>; 
00278 
00284     <span class="keywordtype">void</span> freeze();
00285 
00289     <span class="keywordtype">void</span> unfreeze();
00290 
00298     <span class="keywordtype">bool</span> skip(<span class="keywordtype">int</span> n);
00299 
00300 
00306     <span class="keywordtype">int</span> seek(oid_t oid);
00307 
<a name="l00311"></a><a class="code" href="classdbAnyCursor.html#dbCursor_3_01dbTimeSeriesBlock_3_01T_01_4_01_4a43">00311</a>     <a class="code" href="classdbTableDescriptor.html">dbTableDescriptor</a>* getTable() { <span class="keywordflow">return</span> table; }
00312 
00313 
<a name="l00318"></a><a class="code" href="classdbAnyCursor.html#dbCursor_3_01dbTimeSeriesBlock_3_01T_01_4_01_4a44">00318</a>     <span class="keywordtype">void</span> setTable(<a class="code" href="classdbTableDescriptor.html">dbTableDescriptor</a>* aTable) { 
00319         table = aTable;
00320         db = aTable-&gt;<a class="code" href="classdbTableDescriptor.html#dbTableDescriptorn10">db</a>;
00321     }
00322 
<a name="l00327"></a><a class="code" href="classdbAnyCursor.html#dbCursor_3_01dbTimeSeriesBlock_3_01T_01_4_01_4a45">00327</a>     <span class="keywordtype">void</span> setRecord(<span class="keywordtype">void</span>* rec) { 
00328         record = (byte*)rec;
00329     }
00330 
<a name="l00335"></a><a class="code" href="classdbAnyCursor.html#dbCursor_3_01dbTimeSeriesBlock_3_01T_01_4_01_4a46">00335</a>     <span class="keywordtype">void</span>* getRecord() { 
00336         <span class="keywordflow">return</span> record;
00337     }
00338 
00343     <span class="keywordtype">bool</span> isInSelection(oid_t oid);
00344 
00345 
<a name="l00350"></a><a class="code" href="classdbAnyCursor.html#dbCursor_3_01dbTimeSeriesBlock_3_01T_01_4_01_4a48">00350</a>     <span class="keywordtype">void</span> fetch() { 
00351         assert(!(db-&gt;currIndex[currId] 
00352                  &amp; (dbInternalObjectMarker|dbFreeHandleMarker)));
00353         table-&gt;columns-&gt;fetchRecordFields(record, 
00354                                           (byte*)db-&gt;getRow(currId));
00355     }
00356 
00360     <span class="keywordtype">bool</span> hasNext() <span class="keyword">const</span>;
00361     
00362   <span class="keyword">protected</span>: 
00363     <a class="code" href="classdbDatabase.html">dbDatabase</a>*        db;
00364     <a class="code" href="classdbTableDescriptor.html">dbTableDescriptor</a>* table;
00365     dbCursorType       type;
00366     dbCursorType       defaultType;
00367     dbSelection        selection;
00368     <span class="keywordtype">bool</span>               allRecords;
00369     oid_t              firstId;
00370     oid_t              lastId;
00371     oid_t              currId;
00372     byte*              record;
00373     size_t             limit;
00374 
00375     int4*              bitmap; <span class="comment">// bitmap to avoid duplicates</span>
00376     size_t             bitmapSize;
00377     <span class="keywordtype">bool</span>               eliminateDuplicates;
00378     <span class="keywordtype">bool</span>               prefetch;
00379     <span class="keywordtype">bool</span>               removed; <span class="comment">// current record was removed</span>
00380     <span class="keywordtype">bool</span>               lastRecordWasDeleted; <span class="comment">//last record was deleted</span>
00381 
00382     size_t             stmtLimitStart;
00383     size_t             stmtLimitLen;
00384     size_t             nSkipped;
00385 
00386     <span class="keywordtype">void</span>*              paramBase;
00387     
00388     <span class="keywordtype">void</span> checkForDuplicates();
00389     <span class="keywordtype">void</span> deallocateBitmap();
00390 
00391     <span class="keywordtype">bool</span> isMarked(oid_t oid) { 
00392         <span class="keywordflow">return</span> bitmap != NULL &amp;&amp; (bitmap[oid &gt;&gt; 5] &amp; (1 &lt;&lt; (oid &amp; 31))) != 0;
00393     }
00394 
00395     <span class="keywordtype">void</span> setStatementLimit(<a class="code" href="classdbQuery.html">dbQuery</a> <span class="keyword">const</span>&amp; q) { 
00396         stmtLimitStart = q.<a class="code" href="classdbCompiledQuery.html#dbQuerym8">stmtLimitStartPtr</a> != NULL ? (nat4)*q.<a class="code" href="classdbCompiledQuery.html#dbQuerym8">stmtLimitStartPtr</a> : q.<a class="code" href="classdbCompiledQuery.html#dbQuerym6">stmtLimitStart</a>;
00397         stmtLimitLen = q.<a class="code" href="classdbCompiledQuery.html#dbQuerym9">stmtLimitLenPtr</a> != NULL ? (nat4)*q.<a class="code" href="classdbCompiledQuery.html#dbQuerym9">stmtLimitLenPtr</a> : q.<a class="code" href="classdbCompiledQuery.html#dbQuerym7">stmtLimitLen</a>;
00398     }
00399 
00400     <span class="keywordtype">void</span> truncateSelection() { 
00401         selection.truncate(stmtLimitStart, stmtLimitLen);
00402     }
00403 
00404     <span class="keywordtype">void</span> mark(oid_t oid) { 
00405         <span class="keywordflow">if</span> (bitmap != NULL) { 
00406             bitmap[oid &gt;&gt; 5] |= 1 &lt;&lt; (oid &amp; 31);
00407         }
00408     }    
00409 
00410     <span class="keywordtype">bool</span> add(oid_t oid) { 
00411         <span class="keywordflow">if</span> (selection.nRows &lt; limit &amp;&amp; selection.nRows &lt; stmtLimitLen) { 
00412             <span class="keywordflow">if</span> (nSkipped &lt; stmtLimitStart) { 
00413                 nSkipped += 1;
00414                 <span class="keywordflow">return</span> <span class="keyword">true</span>;
00415             }
00416             <span class="keywordflow">if</span> (eliminateDuplicates) { 
00417                 <span class="keywordflow">if</span> (bitmap[oid &gt;&gt; 5] &amp; (1 &lt;&lt; (oid &amp; 31))) { 
00418                     <span class="keywordflow">return</span> <span class="keyword">true</span>;
00419                 }
00420                 bitmap[oid &gt;&gt; 5] |= 1 &lt;&lt; (oid &amp; 31);
00421             } 
00422             selection.add(oid);
00423             <span class="keywordflow">return</span> selection.nRows &lt; limit;
00424         } 
00425         <span class="keywordflow">return</span> <span class="keyword">false</span>;
00426     }
00427 
00428     <span class="keywordtype">bool</span> gotoNext();
00429     <span class="keywordtype">bool</span> gotoPrev(); 
00430     <span class="keywordtype">bool</span> gotoFirst();
00431     <span class="keywordtype">bool</span> gotoLast();
00432     
00433     <span class="keywordtype">bool</span> moveNext();
00434     <span class="keywordtype">bool</span> movePrev();
00435 
00436     <span class="keywordtype">void</span> setCurrent(<a class="code" href="classdbAnyReference.html">dbAnyReference</a> <span class="keyword">const</span>&amp; ref);
00437 
00438     <span class="keywordtype">void</span> adjustReferences(size_t base, size_t size, <span class="keywordtype">long</span> shift) { 
00439         <span class="keywordflow">if</span> (currId != 0 &amp;&amp; record != NULL) { 
00440             table-&gt;<a class="code" href="classdbTableDescriptor.html#dbTableDescriptorn4">columns</a>-&gt;<a class="code" href="classdbFieldDescriptor.html#dbFieldDescriptora8">adjustReferences</a>(record, base, size, shift);
00441         }
00442     }
00443 
00444     dbAnyCursor(<a class="code" href="classdbTableDescriptor.html">dbTableDescriptor</a>&amp; aTable, dbCursorType aType, byte* rec)
00445     : table(&amp;aTable),type(aType),defaultType(aType),
00446       allRecords(false),currId(0),record(rec)
00447     {
00448         db = aTable.<a class="code" href="classdbTableDescriptor.html#dbTableDescriptorn10">db</a>;
00449         limit = dbDefaultSelectionLimit;
00450         prefetch = rec != NULL;
00451         removed = <span class="keyword">false</span>;
00452         bitmap = NULL; 
00453         bitmapSize = 0;
00454         eliminateDuplicates = <span class="keyword">false</span>;
00455         paramBase = NULL;
00456         stmtLimitLen = dbDefaultSelectionLimit;
00457         stmtLimitStart = 0;
00458         nSkipped = 0;
00459     }
00460   <span class="keyword">public</span>:
00461     dbAnyCursor() 
00462     : table(NULL),type(dbCursorViewOnly),defaultType(dbCursorViewOnly),
00463           allRecords(false),currId(0),record(NULL)