classdbcursor.html

FastDb是高效的内存数据库系统

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Check whether current record is the first one in the selection <dl compact><dt><b>Returns:</b></dt><dd>true if prev() method will return <code>NULL</code> </dd></dl>
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<a class="anchor" name="dbCursor_3_01Sequencer_01_4a46" doxytag="dbCursor::isInSelection" ></a><p>
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          <td class="md" nowrap valign="top"> bool dbAnyCursor::isInSelection </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>oid</em>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
          <td class="md" nowrap><code> [inherited]</code></td>
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Check if record with specified OID is in selection <dl compact><dt><b>Returns:</b></dt><dd><code>true</code> if record with such OID was selected </dd></dl>
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<a class="anchor" name="dbCursora13" doxytag="dbCursor::isInSelection" ></a><p>
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template&lt;class T&gt; </td>
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          <td class="md" nowrap valign="top"> bool <a class="el" href="classdbCursor.html">dbCursor</a>&lt; T &gt;::isInSelection </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; &amp;&nbsp;</td>
          <td class="mdname1" valign="top" nowrap> <em>ref</em>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
          <td class="md" nowrap> const<code> [inline]</code></td>
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Check if record with specified OID is in selection <dl compact><dt><b>Returns:</b></dt><dd><code>true</code> if record with such OID was selected </dd></dl>
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<a class="anchor" name="dbCursor_3_01Sequencer_01_4a36" doxytag="dbCursor::isLast" ></a><p>
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          <td class="md" nowrap valign="top"> bool dbAnyCursor::isLast </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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Check whether current record is the last one in the selection <dl compact><dt><b>Returns:</b></dt><dd>true if next() method will return <code>NULL</code> </dd></dl>
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<a class="anchor" name="dbCursor_3_01Sequencer_01_4a19" doxytag="dbCursor::isLimitReached" ></a><p>
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          <td class="md" nowrap valign="top"> bool dbAnyCursor::isLimitReached </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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Checks whether limit for number of selected reacord is reached <dl compact><dt><b>Returns:</b></dt><dd>true if limit is reached </dd></dl>
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<a class="anchor" name="dbCursor_3_01Sequencer_01_4a18" doxytag="dbCursor::isUpdateCursor" ></a><p>
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          <td class="md" nowrap valign="top"> bool dbAnyCursor::isUpdateCursor </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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Check whether this cursor can be used for update <dl compact><dt><b>Returns:</b></dt><dd>true if it is update cursor </dd></dl>
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<a class="anchor" name="dbCursora6" doxytag="dbCursor::last" ></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;::last </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 last record <dl compact><dt><b>Returns:</b></dt><dd>pointer to the last record or <code>NULL</code> if no records were selected </dd></dl>
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<a class="anchor" name="dbCursora3" doxytag="dbCursor::next" ></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;::next </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 next record <dl compact><dt><b>Returns:</b></dt><dd>pointer to the next record or <code>NULL</code> if there is no next record </dd></dl>
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<a class="anchor" name="dbCursora12" doxytag="dbCursor::nextAvailable" ></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;::nextAvailable </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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Method nextAvailable allows to iterate through the records in uniform way even when some records are removed. For example: <pre><div>
 if (cursor.select(q) &gt; 0) { 
     do { 
         if (x) { 
             cursor.remove();
         } else { 
             cursor.update();
         }
     } while (cursor.nextAvaiable());
  }
     *</pre></div> <dl compact><dt><b>Returns:</b></dt><dd>pointer to the current record </dd></dl>
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<a class="anchor" name="dbCursora8" doxytag="dbCursor::operator->" ></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;::operator-&gt; </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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Overloaded operator for accessing components of the current record <dl compact><dt><b>Returns:</b></dt><dd>pointer to the current record </dd></dl>
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<a class="anchor" name="dbCursora4" doxytag="dbCursor::prev" ></a><p>
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template&lt;class T&gt; </td>