classdbdatabase.html

FastDb是高效的内存数据库系统

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<a class="anchor" name="dbSubSqlb28" doxytag="dbDatabase::allocateRow" ></a><p>
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          <td class="md" nowrap valign="top"> oid_t dbDatabase::allocateRow </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">oid_t&nbsp;</td>
          <td class="mdname" nowrap> <em>tableId</em>, </td>
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          <td class="md" nowrap>size_t&nbsp;</td>
          <td class="mdname" nowrap> <em>size</em></td>
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          <td class="md">)&nbsp;</td>
          <td class="md" colspan="2"><code> [inline, protected]</code></td>
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Allocate record <dl compact><dt><b>Parameters:</b></dt><dd>
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    <tr><td valign=top><em>tableId</em>&nbsp;</td><td>object identifier of the table </td></tr>
    <tr><td valign=top><em>size</em>&nbsp;</td><td>size of the created record as table descriptor in the database </td></tr>
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<a class="anchor" name="dbSubSqla25" doxytag="dbDatabase::allowColumnsDeletion" ></a><p>
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          <td class="md" nowrap valign="top"> void dbDatabase::allowColumnsDeletion </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">bool&nbsp;</td>
          <td class="mdname1" valign="top" nowrap> <em>enabled</em> = true          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
          <td class="md" nowrap><code> [inline]</code></td>
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<p>
Enable deletion of columns from the table when correspondent fields are renamed from class descriptor. By default it is switched of and database allows to delete fields only from empty table (to prevent unindented loose of data). <dl compact><dt><b>Parameters:</b></dt><dd>
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    <tr><td valign=top><em>enabled</em>&nbsp;</td><td>true to enable column deletion in non empty tables </td></tr>
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<a class="anchor" name="dbSubSqla16" doxytag="dbDatabase::assign" ></a><p>
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          <td class="md" nowrap valign="top"> void dbDatabase::assign </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top"><a class="el" href="classdbTableDescriptor.html">dbTableDescriptor</a> &amp;&nbsp;</td>
          <td class="mdname1" valign="top" nowrap> <em>desc</em>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
          <td class="md" nowrap><code> [inline]</code></td>
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Assign table to the database <dl compact><dt><b>Parameters:</b></dt><dd>
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    <tr><td valign=top><em>desc</em>&nbsp;</td><td>table descriptor </td></tr>
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<a class="anchor" name="dbSubSqla12" doxytag="dbDatabase::attach" ></a><p>
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          <td class="md" nowrap valign="top"> void dbDatabase::attach </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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Attach current thread to the database. This method should be executed for all threads except one which opened the database.     </td>
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<a class="anchor" name="dbSubSqla15" doxytag="dbDatabase::backup" ></a><p>
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          <td class="md" nowrap valign="top"> bool dbDatabase::backup </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">char const *&nbsp;</td>
          <td class="mdname" nowrap> <em>file</em>, </td>
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          <td class="md" nowrap>bool&nbsp;</td>
          <td class="mdname" nowrap> <em>compactify</em></td>
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          <td class="md">)&nbsp;</td>
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<p>
Perform backup to the specified file <dl compact><dt><b>Parameters:</b></dt><dd>
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    <tr><td valign=top><em>file</em>&nbsp;</td><td>path to the backup file </td></tr>
    <tr><td valign=top><em>comactify</em>&nbsp;</td><td>if true then databae will be compactificated during backup - i.e. all used objects will be placed together without holes; if false then backup is performed by just writting memory mapped object to the backup file. </td></tr>
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<dl compact><dt><b>Returns:</b></dt><dd>whether backup was succeseful or not </dd></dl>
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<a class="anchor" name="dbSubSqlb26" doxytag="dbDatabase::checkVersion" ></a><p>
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          <td class="md" nowrap valign="top"> bool dbDatabase::checkVersion </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> [protected]</code></td>
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Check if program works with correct version of memory mapped object (if memory mapped object is reallocated by some client, its version number is incremented, so all other client will be able to notice it and also reallocate their memory mapping objects. <dl compact><dt><b>Returns:</b></dt><dd>true if memory mapping