classdbanycursor.html

FastDb是高效的内存数据库系统

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          <td class="md" nowrap>void const *&nbsp;</td>
          <td class="mdname" nowrap> <em>minValue</em>, </td>
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          <td class="md" nowrap>void const *&nbsp;</td>
          <td class="mdname" nowrap> <em>maxValue</em></td>
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          <td class="md">)&nbsp;</td>
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Select all records from the table with specfied range of the key values <dl compact><dt><b>Parameters:</b></dt><dd>
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    <tr><td valign=top><em>key</em>&nbsp;</td><td>name of the key field </td></tr>
    <tr><td valign=top><em>minValue</em>&nbsp;</td><td>inclusive low bound for key values, if <code>NULL</code> then there is no low bound </td></tr>
    <tr><td valign=top><em>maxValue</em>&nbsp;</td><td>inclusive high bound for key values, if <code>NULL</code> then there is no high bound </td></tr>
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<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_4a34" doxytag="dbAnyCursor::setPrefetchMode" ></a><p>
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          <td class="md" nowrap valign="top"> void dbAnyCursor::setPrefetchMode </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">bool&nbsp;</td>
          <td class="mdname1" valign="top" nowrap> <em>mode</em>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
          <td class="md" nowrap><code> [inline]</code></td>
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Set prefetch mode. By default, current record is fetch as soon as it is becomes current. But sometimesyou need only OIDs of selected records. In this case setting prefetchMode to false can help. <dl compact><dt><b>Parameters:</b></dt><dd>
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    <tr><td valign=top><em>mode</em>&nbsp;</td><td>if <code>false</code> then current record is not fetched. You should explicitly call <code>fetch</code> method if you want to fetch it. </td></tr>
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<a class="anchor" name="dbCursor_3_01Sequencer_01_4a44" doxytag="dbAnyCursor::setRecord" ></a><p>
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          <td class="md" nowrap valign="top"> void dbAnyCursor::setRecord </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">void *&nbsp;</td>
          <td class="mdname1" valign="top" nowrap> <em>rec</em>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
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Set destination for selected record rec - buffer to which fields of current record will be fetched     </td>
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<a class="anchor" name="dbCursor_3_01Sequencer_01_4a32" doxytag="dbAnyCursor::setSelectionLimit" ></a><p>
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          <td class="md" nowrap valign="top"> void dbAnyCursor::setSelectionLimit </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">size_t&nbsp;</td>
          <td class="mdname1" valign="top" nowrap> <em>lim</em>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
          <td class="md" nowrap><code> [inline]</code></td>
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Specify maximal number of records to be selected     </td>
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<a class="anchor" name="dbCursor_3_01Sequencer_01_4a43" doxytag="dbAnyCursor::setTable" ></a><p>
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          <td class="md" nowrap valign="top"> void dbAnyCursor::setTable </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top"><a class="el" href="classdbTableDescriptor.html">dbTableDescriptor</a> *&nbsp;</td>
          <td class="mdname1" valign="top" nowrap> <em>aTable</em>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
          <td class="md" nowrap><code> [inline]</code></td>
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Set table for the cursor <dl compact><dt><b>Parameters:</b></dt><dd>
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    <tr><td valign=top><em>aTable</em>&nbsp;</td><td>table which records will be iterated </td></tr>
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<a class="anchor" name="dbCursor_3_01Sequencer_01_4a40" doxytag="dbAnyCursor::skip" ></a><p>
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          <td class="md" nowrap valign="top"> bool dbAnyCursor::skip </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">int&nbsp;</td>
          <td class="mdname1" valign="top" nowrap> <em>n</em>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
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Skip specified number of records <dl compact><dt><b>Parameters:</b></dt><dd>
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    <tr><td valign=top><em>n</em>&nbsp;</td><td>if positive then skip <code>n</code> records forward, if negative then skip <code>-n</code> records backward </td></tr>
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<dl compact><dt><b>Returns:</b></dt><dd><code>true</code> if specified number of records was successfully skipped, <code>false</code> if there is no next (<code>n &gt; 0</code>) or previous (<code>n &lt; 0</code>) record in the selction. </dd></dl>
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<a class="anchor" name="dbCursor_3_01Sequencer_01_4a20" doxytag="dbAnyCursor::toArrayOfOid" ></a><p>
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          <td class="md" nowrap valign="top"> oid_t* dbAnyCursor::toArrayOfOid </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">oid_t *&nbsp;</td>
          <td class="mdname1" valign="top" nowrap> <em>arr</em>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
          <td class="md" nowrap> const</td>
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Extract OIDs of selected recrods in array <dl compact><dt><b>Parameters:</b></dt><dd>
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    <tr><td valign=top><em>arr</em>&nbsp;</td><td>if <code>arr</code> is not null, then this array is used as destination (it should be at least selection.nRows long)<br>
 If <code>arr</code> is null, then new array is created by new oid_t[] and returned by this method </td></tr>
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<dl compact><dt><b>Returns:</b></dt><dd>if <code>arr</code> is not null, then <code>arr</code>, otherwise array created by this method </dd></dl>
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<a class="anchor" name="dbCursor_3_01Sequencer_01_4a39" doxytag="dbAnyCursor::unfreeze" ></a><p>
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          <td class="md" nowrap valign="top"> void dbAnyCursor::unfreeze </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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Unfreeze cursor. This method starts new transaction and restore state of the cursor     </td>
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<a class="anchor" name="dbCursor_3_01Sequencer_01_4a33" doxytag="dbAnyCursor::unsetSelectionLimit" ></a><p>
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          <td class="md" nowrap valign="top"> void dbAnyCursor::unsetSelectionLimit </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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Remove selection limit     </td>
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<a class="anchor" name="dbCursor_3_01Sequencer_01_4a29" doxytag="dbAnyCursor::update" ></a><p>
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          <td class="md" nowrap valign="top"> void dbAnyCursor::update </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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Update current record. You should changed value of current record before and then call update method to save changes to the database     </td>
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<hr>The documentation for this class was generated from the following file:<ul>
<li><a class="el" href="cursor_8h-source.html">cursor.h</a></ul>
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