classdbcursor.html

FastDb是高效的内存数据库系统

template&lt;class T&gt; </td>
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          <td class="md" nowrap valign="top"> T* <a class="el" href="classdbCursor.html">dbCursor</a>&lt; T &gt;::at </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top"><a class="el" href="classdbReference.html">dbReference</a>&lt; T &gt; const &amp;&nbsp;</td>
          <td class="mdname1" valign="top" nowrap> <em>ref</em>          </td>
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          <td class="md" nowrap><code> [inline]</code></td>
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Select record by reference <dl compact><dt><b>Parameters:</b></dt><dd>
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    <tr><td valign=top><em>ref</em>&nbsp;</td><td>reference to the record </td></tr>
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<dl compact><dt><b>Returns:</b></dt><dd>pointer to the referenced record </dd></dl>
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<a class="anchor" name="dbCursora11" doxytag="dbCursor::currentId" ></a><p>
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template&lt;class T&gt; </td>
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          <td class="md" nowrap valign="top"> <a class="el" href="classdbReference.html">dbReference</a>&lt;T&gt; <a class="el" href="classdbCursor.html">dbCursor</a>&lt; T &gt;::currentId </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="mdname1" valign="top" nowrap>          </td>
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          <td class="md" nowrap> const<code> [inline]</code></td>
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Get current object idenitifer <dl compact><dt><b>Returns:</b></dt><dd>reference to the current record </dd></dl>
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<a class="anchor" name="dbCursor_3_01Sequencer_01_4a47" doxytag="dbCursor::fetch" ></a><p>
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          <td class="md" nowrap valign="top"> void dbAnyCursor::fetch </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="mdname1" valign="top" nowrap>          </td>
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          <td class="md" nowrap><code> [inline, inherited]</code></td>
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Fetch current record. You should use this method only if prefetch mode is disabled     </td>
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<a class="anchor" name="dbCursora5" doxytag="dbCursor::first" ></a><p>
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template&lt;class T&gt; </td>
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          <td class="md" nowrap valign="top"> T* <a class="el" href="classdbCursor.html">dbCursor</a>&lt; T &gt;::first </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="mdname1" valign="top" nowrap>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
          <td class="md" nowrap><code> [inline]</code></td>
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Get pointer to the first record <dl compact><dt><b>Returns:</b></dt><dd>pointer to the first record or <code>NULL</code> if no records were selected </dd></dl>
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<a class="anchor" name="dbCursor_3_01Sequencer_01_4a38" doxytag="dbCursor::freeze" ></a><p>
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          <td class="md" nowrap valign="top"> void dbAnyCursor::freeze </td>
          <td class="md" valign="top">(&nbsp;</td>
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          <td class="md" nowrap><code> [inherited]</code></td>
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Freeze cursor. This method makes it possible to save current state of cursor, close transaction to allow other threads to proceed, and then later restore state of the cursor using unfreeze method and continue traversal through selected records.     </td>
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<a class="anchor" name="dbCursora2" doxytag="dbCursor::get" ></a><p>
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template&lt;class T&gt; </td>
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          <td class="md" nowrap valign="top"> T* <a class="el" href="classdbCursor.html">dbCursor</a>&lt; T &gt;::get </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="mdname1" valign="top" nowrap>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
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Get pointer to the current record <dl compact><dt><b>Returns:</b></dt><dd>pointer to the current record or <code>NULL</code> if there is no current record </dd></dl>
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<a class="anchor" name="dbCursor_3_01Sequencer_01_4a14" doxytag="dbCursor::getNumberOfRecords" ></a><p>
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          <td class="md" nowrap valign="top"> int dbAnyCursor::getNumberOfRecords </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="mdname1" valign="top" nowrap>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
          <td class="md" nowrap> const<code> [inline, inherited]</code></td>
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Get number of selected records <dl compact><dt><b>Returns:</b></dt><dd>number of selected records </dd></dl>
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<a class="anchor" name="dbCursor_3_01Sequencer_01_4a45" doxytag="dbCursor::getRecord" ></a><p>
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          <td class="md" nowrap valign="top"> void* dbAnyCursor::getRecord </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="mdname1" valign="top" nowrap>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
          <td class="md" nowrap><code> [inline, inherited]</code></td>
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Get pointer to the location where fields of the current record are fetched <dl compact><dt><b>Returns:</b></dt><dd>pointer to the memory location set by cursor constructor or setRecord method </dd></dl>
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<a class="anchor" name="dbCursor_3_01Sequencer_01_4a42" doxytag="dbCursor::getTable" ></a><p>
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          <td class="md" nowrap valign="top"> <a class="el" href="classdbTableDescriptor.html">dbTableDescriptor</a>* dbAnyCursor::getTable </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="mdname1" valign="top" nowrap>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
          <td class="md" nowrap><code> [inline, inherited]</code></td>
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Get table for which cursor is opened     </td>
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<a class="anchor" name="dbCursor_3_01Sequencer_01_4a16" doxytag="dbCursor::isEmpty" ></a><p>
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          <td class="md" nowrap valign="top"> bool dbAnyCursor::isEmpty </td>
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          <td class="mdname1" valign="top" nowrap>          </td>
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          <td class="md" nowrap> const<code> [inline, inherited]</code></td>
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Checks whether selection is empty <dl compact><dt><b>Returns:</b></dt><dd>true if there is no current record </dd></dl>
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<a class="anchor" name="dbCursor_3_01Sequencer_01_4a37" doxytag="dbCursor::isFirst" ></a><p>
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          <td class="md" nowrap valign="top"> bool dbAnyCursor::isFirst </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="mdname1" valign="top" nowrap>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
          <td class="md" nowrap> const<code> [inherited]</code></td>
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