classdbfielddescriptor.html

FastDb是高效的内存数据库系统

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Find component with specified name (for structures only) <dl compact><dt><b>Parameters:</b></dt><dd>
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    <tr><td valign=top><em>name</em>&nbsp;</td><td>component name </td></tr>
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<dl compact><dt><b>Returns:</b></dt><dd>descriptor of the field or <code>NULL</code> if not found </dd></dl>
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<a class="anchor" name="dbFieldDescriptora10" doxytag="dbFieldDescriptor::getFirstComponent" ></a><p>
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          <td class="md" nowrap valign="top"> <a class="el" href="classdbFieldDescriptor.html">dbFieldDescriptor</a>* dbFieldDescriptor::getFirstComponent </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 first component of the field (for structures only) <dl compact><dt><b>Returns:</b></dt><dd>first component of the structure </dd></dl>
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<a class="anchor" name="dbFieldDescriptora11" doxytag="dbFieldDescriptor::getNextComponent" ></a><p>
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          <td class="md" nowrap valign="top"> <a class="el" href="classdbFieldDescriptor.html">dbFieldDescriptor</a>* dbFieldDescriptor::getNextComponent </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top"><a class="el" href="classdbFieldDescriptor.html">dbFieldDescriptor</a> *&nbsp;</td>
          <td class="mdname1" valign="top" nowrap> <em>field</em>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
          <td class="md" nowrap><code> [inline]</code></td>
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Get next component within the scope <dl compact><dt><b>Returns:</b></dt><dd>next component within the scope </dd></dl>
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<a class="anchor" name="dbFieldDescriptora6" doxytag="dbFieldDescriptor::markUpdatedFields" ></a><p>
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          <td class="md" nowrap valign="top"> void dbFieldDescriptor::markUpdatedFields </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">byte *&nbsp;</td>
          <td class="mdname" nowrap> <em>dst</em>, </td>
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          <td></td>
          <td></td>
          <td class="md" nowrap>byte *&nbsp;</td>
          <td class="mdname" nowrap> <em>src</em></td>
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          <td class="md">)&nbsp;</td>
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Mask updated fields. This method performs interation thtough all components in one scope and recursively invoke itself for structure and array components. <dl compact><dt><b>Parameters:</b></dt><dd>
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    <tr><td valign=top><em>dst</em>&nbsp;</td><td>old image of the record in the database </td></tr>
    <tr><td valign=top><em>src</em>&nbsp;</td><td>updated application object </td></tr>
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<a class="anchor" name="dbFieldDescriptora12" doxytag="dbFieldDescriptor::operator," ></a><p>
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          <td class="md" nowrap valign="top"> <a class="el" href="classdbFieldDescriptor.html">dbFieldDescriptor</a>&amp; dbFieldDescriptor::operator, </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top"><a class="el" href="classdbFieldDescriptor.html">dbFieldDescriptor</a> &amp;&nbsp;</td>
          <td class="mdname1" valign="top" nowrap> <em>field</em>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
          <td class="md" nowrap><code> [inline]</code></td>
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Redefined ',' operator used to form list of components     </td>
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<a class="anchor" name="dbFieldDescriptora3" doxytag="dbFieldDescriptor::sizeWithoutOneField" ></a><p>
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          <td class="md" nowrap valign="top"> int dbFieldDescriptor::sizeWithoutOneField </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top"><a class="el" href="classdbFieldDescriptor.html">dbFieldDescriptor</a> *&nbsp;</td>
          <td class="mdname" nowrap> <em>field</em>, </td>
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          <td></td>
          <td></td>
          <td class="md" nowrap>byte *&nbsp;</td>
          <td class="mdname" nowrap> <em>base</em>, </td>
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          <td class="md" nowrap>size_t &amp;&nbsp;</td>
          <td class="mdname" nowrap> <em>size</em></td>
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          <td class="md">)&nbsp;</td>
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Size of the record without one field. This method is used to implement automatically updated inverse references. This method performs interation thtough all components in one scope and recursively invoke itself for structure and array components. <dl compact><dt><b>Parameters:</b></dt><dd>
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    <tr><td valign=top><em>field</em>&nbsp;</td><td>list of the fields in one scope </td></tr>
    <tr><td valign=top><em>base</em>&nbsp;</td><td>pointer inside database </td></tr>
    <tr><td valign=top><em>size</em>&nbsp;</td><td>[in/out] size of the record </td></tr>
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<dl compact><dt><b>Returns:</b></dt><dd>offset of last field </dd></dl>
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<a class="anchor" name="dbFieldDescriptora5" doxytag="dbFieldDescriptor::storeRecordFields" ></a><p>
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          <td class="md" nowrap valign="top"> size_t dbFieldDescriptor::storeRecordFields </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">byte *&nbsp;</td>
          <td class="mdname" nowrap> <em>dst</em>, </td>
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          <td></td>
          <td></td>
          <td class="md" nowrap>byte *&nbsp;</td>
          <td class="mdname" nowrap> <em>src</em>, </td>
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          <td></td>
          <td></td>
          <td class="md" nowrap>size_t&nbsp;</td>
          <td class="mdname" nowrap> <em>offs</em>, </td>
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          <td></td>
          <td class="md" nowrap>bool&nbsp;</td>
          <td class="mdname" nowrap> <em>insert</em></td>
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          <td class="md">)&nbsp;</td>
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Store record fields in the databases This method performs interation thtough all components in one scope and recursively invoke itself for structure and array components. <dl compact><dt><b>Parameters:</b></dt><dd>
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    <tr><td valign=top><em>dst</em>&nbsp;</td><td>place in the database where record should be stored </td></tr>
    <tr><td valign=top><em>src</em>&nbsp;</td><td>pointer to the application object </td></tr>
    <tr><td valign=top><em>offs</em>&nbsp;</td><td>offset to the end of varying part </td></tr>
    <tr><td valign=top><em>insert</em>&nbsp;</td><td>flag used to distringuish update fro insert (needed for autoincremented fields) </td></tr>
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<dl compact><dt><b>Returns:</b></dt><dd>size of the record </dd></dl>
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<hr><h2>Member Data Documentation</h2>
<a class="anchor" name="dbFieldDescriptoro24" doxytag="dbFieldDescriptor::alignment" ></a><p>
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          <td class="md" nowrap valign="top"> size_t <a class="el" href="classdbFieldDescriptor.html#dbFieldDescriptoro24">dbFieldDescriptor::alignment</a>
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Alignment of the field (for structures it is equal to the maximum required alignment of it's components     </td>
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<a class="anchor" name="dbFieldDescriptoro18" doxytag="dbFieldDescriptor::appOffs" ></a><p>
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          <td class="md" nowrap valign="top"> int <a class="el" href="classdbFieldDescriptor.html#dbFieldDescriptoro18">dbFieldDescriptor::appOffs</a>
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Offset to the field in application     </td>
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<a class="anchor" name="dbFieldDescriptoro23" doxytag="dbFieldDescriptor::appSize" ></a><p>
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          <td class="md" nowrap valign="top"> size_t <a class="el" href="classdbFieldDescriptor.html#dbFieldDescriptoro23">dbFieldDescriptor::appSize</a>
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