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<?xml version="1.0" encoding="ascii"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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>kyotocabinet</th>
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<span class="breadcrumbs">
<a href="kyotocabinet-module.html">Module kyotocabinet</a> ::
Class Cursor
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<!-- ==================== CLASS DESCRIPTION ==================== -->
<h1 class="epydoc">Class Cursor</h1><p class="nomargin-top"></p>
<p>Interface of cursor to indicate a record.</p>
<!-- ==================== INSTANCE METHODS ==================== -->
<a name="section-InstanceMethods"></a>
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cellspacing="0" width="100%" bgcolor="white">
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<td align="left" colspan="2" class="table-header">
<span class="table-header">Instance Methods</span></td>
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<span class="summary-type"> </span>
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<td><span class="summary-sig"><a href="kyotocabinet.Cursor-class.html#disable" class="summary-sig-name">disable</a>(<span class="summary-sig-arg">self</span>)</span><br />
Disable the cursor.</td>
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</td>
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<span class="summary-type"> </span>
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<td><span class="summary-sig"><a href="kyotocabinet.Cursor-class.html#accept" class="summary-sig-name">accept</a>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">visitor</span>,
<span class="summary-sig-arg">writable</span>=<span class="summary-sig-default">True</span>,
<span class="summary-sig-arg">step</span>=<span class="summary-sig-default">False</span>)</span><br />
Accept a visitor to the current record.</td>
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</td>
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</td>
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<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
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<td><span class="summary-sig"><a href="kyotocabinet.Cursor-class.html#set_value" class="summary-sig-name">set_value</a>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">value</span>,
<span class="summary-sig-arg">step</span>=<span class="summary-sig-default">False</span>)</span><br />
Set the value of the current record.</td>
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</td>
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</td>
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<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
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<td><span class="summary-sig"><a href="kyotocabinet.Cursor-class.html#remove" class="summary-sig-name">remove</a>(<span class="summary-sig-arg">self</span>)</span><br />
Remove the current record.</td>
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</td>
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</td>
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<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
</td><td class="summary">
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<td><span class="summary-sig"><a href="kyotocabinet.Cursor-class.html#get_key" class="summary-sig-name">get_key</a>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">step</span>=<span class="summary-sig-default">False</span>)</span><br />
Get the key of the current record.</td>
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</td>
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</td>
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<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
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<td><span class="summary-sig"><a href="kyotocabinet.Cursor-class.html#get_key_str" class="summary-sig-name">get_key_str</a>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">step</span>=<span class="summary-sig-default">False</span>)</span><br />
Get the key of the current record.</td>
<td align="right" valign="top">
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
</td><td class="summary">
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<td><span class="summary-sig"><a href="kyotocabinet.Cursor-class.html#get_value" class="summary-sig-name">get_value</a>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">step</span>=<span class="summary-sig-default">False</span>)</span><br />
Get the value of the current record.</td>
<td align="right" valign="top">
</td>
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</table>
</td>
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<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
</td><td class="summary">
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<td><span class="summary-sig"><a href="kyotocabinet.Cursor-class.html#get_value_str" class="summary-sig-name">get_value_str</a>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">step</span>=<span class="summary-sig-default">False</span>)</span><br />
Get the value of the current record.</td>
<td align="right" valign="top">
</td>
</tr>
</table>
</td>
</tr>
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<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
</td><td class="summary">
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<tr>
<td><span class="summary-sig"><a href="kyotocabinet.Cursor-class.html#get" class="summary-sig-name">get</a>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">step</span>=<span class="summary-sig-default">False</span>)</span><br />
Get a pair of the key and the value of the current record.</td>
<td align="right" valign="top">
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
</td><td class="summary">
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<tr>
<td><span class="summary-sig"><a href="kyotocabinet.Cursor-class.html#get_str" class="summary-sig-name">get_str</a>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">step</span>=<span class="summary-sig-default">False</span>)</span><br />
Get a pair of the key and the value of the current record.</td>
<td align="right" valign="top">
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
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<td><span class="summary-sig"><a href="kyotocabinet.Cursor-class.html#seize" class="summary-sig-name">seize</a>(<span class="summary-sig-arg">self</span>)</span><br />
Get a pair of the key and the value of the current record and remove
it atomically.</td>
<td align="right" valign="top">
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
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<td><span class="summary-sig"><a href="kyotocabinet.Cursor-class.html#seize_str" class="summary-sig-name">seize_str</a>(<span class="summary-sig-arg">self</span>)</span><br />
Get a pair of the key and the value of the current record and remove
it atomically.</td>
<td align="right" valign="top">
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
</td><td class="summary">
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<tr>
<td><span class="summary-sig"><a href="kyotocabinet.Cursor-class.html#jump" class="summary-sig-name">jump</a>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">key</span>=<span class="summary-sig-default">None</span>)</span><br />
Jump the cursor to a record for forward scan.</td>
<td align="right" valign="top">
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
</td><td class="summary">
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<tr>
<td><span class="summary-sig"><a href="kyotocabinet.Cursor-class.html#jump_back" class="summary-sig-name">jump_back</a>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">key</span>=<span class="summary-sig-default">None</span>)</span><br />
Jump the cursor to a record for backward scan.</td>
<td align="right" valign="top">
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
</td><td class="summary">
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<tr>
<td><span class="summary-sig"><a href="kyotocabinet.Cursor-class.html#step" class="summary-sig-name">step</a>(<span class="summary-sig-arg">self</span>)</span><br />
Step the cursor to the next record.</td>
<td align="right" valign="top">
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
</td><td class="summary">
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<tr>
<td><span class="summary-sig"><a href="kyotocabinet.Cursor-class.html#step_back" class="summary-sig-name">step_back</a>(<span class="summary-sig-arg">self</span>)</span><br />
Step the cursor to the previous record.</td>
<td align="right" valign="top">
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
</td><td class="summary">
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<tr>
<td><span class="summary-sig"><a href="kyotocabinet.Cursor-class.html#db" class="summary-sig-name">db</a>(<span class="summary-sig-arg">self</span>)</span><br />
Get the database object.</td>
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</td>
</tr>
</table>
</td>
</tr>
<tr>
<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
</td><td class="summary">
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<tr>
<td><span class="summary-sig"><a href="kyotocabinet.Cursor-class.html#error" class="summary-sig-name">error</a>(<span class="summary-sig-arg">self</span>)</span><br />
Get the last happened error.</td>
<td align="right" valign="top">
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
</td><td class="summary">
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<td><span class="summary-sig"><a href="kyotocabinet.Cursor-class.html#__repr__" class="summary-sig-name">__repr__</a>(<span class="summary-sig-arg">self</span>)</span><br />
Get the representing expression.</td>
<td align="right" valign="top">
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
</td><td class="summary">
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<tr>
<td><span class="summary-sig"><a href="kyotocabinet.Cursor-class.html#__str__" class="summary-sig-name">__str__</a>(<span class="summary-sig-arg">self</span>)</span><br />
Get the string expression.</td>
<td align="right" valign="top">
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
</td><td class="summary">
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr>
<td><span class="summary-sig"><a href="kyotocabinet.Cursor-class.html#__next__" class="summary-sig-name">__next__</a>(<span class="summary-sig-arg">self</span>)</span><br />
Get the next key.</td>
<td align="right" valign="top">
</td>
</tr>
</table>
</td>
</tr>
</table>
<!-- ==================== METHOD DETAILS ==================== -->
<a name="section-MethodDetails"></a>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr bgcolor="#70b0f0" class="table-header">
<td align="left" colspan="2" class="table-header">
<span class="table-header">Method Details</span></td>
</tr>
</table>
<a name="disable"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">disable</span>(<span class="sig-arg">self</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
<p>Disable the cursor.</p>
<dl class="fields">
<dt>Returns:</dt>
<dd>always None.</dd>
</dl>
<div class="fields"> <p><strong>Note:</strong>
This method should be called explicitly when the cursor is no
longer in use.
</p>
</div></td></tr></table>
</div>
<a name="accept"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">accept</span>(<span class="sig-arg">self</span>,
<span class="sig-arg">visitor</span>,
<span class="sig-arg">writable</span>=<span class="sig-default">True</span>,
<span class="sig-arg">step</span>=<span class="sig-default">False</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
<p>Accept a visitor to the current record.</p>
<dl class="fields">
<dt>Parameters:</dt>
<dd><ul class="nomargin-top">
<li><strong class="pname"><code>visitor</code></strong> - a visitor object which implements the Visitor interface, or a
function object which receives the key and the value.</li>
<li><strong class="pname"><code>writable</code></strong> - true for writable operation, or false for read-only operation.</li>
<li><strong class="pname"><code>step</code></strong> - true to move the cursor to the next record, or false for no move.</li>
</ul></dd>
<dt>Returns:</dt>
<dd>true on success, or false on failure.</dd>
</dl>
<div class="fields"> <p><strong>Note:</strong>
The operation for each record is performed atomically and other
threads accessing the same record are blocked. To avoid deadlock,
any explicit database operation must not be performed in this
method.
</p>
</div></td></tr></table>
</div>
<a name="set_value"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">set_value</span>(<span class="sig-arg">self</span>,
<span class="sig-arg">value</span>,
<span class="sig-arg">step</span>=<span class="sig-default">False</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
<p>Set the value of the current record.</p>
<dl class="fields">
<dt>Parameters:</dt>
<dd><ul class="nomargin-top">
<li><strong class="pname"><code>value</code></strong> - the value.</li>
<li><strong class="pname"><code>step</code></strong> - true to move the cursor to the next record,</li>
</ul></dd>
<dt>Returns:</dt>
<dd>true on success, or false on failure.</dd>
</dl>
</td></tr></table>
</div>
<a name="remove"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">remove</span>(<span class="sig-arg">self</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
<p>Remove the current record.</p>
<dl class="fields">
<dt>Returns:</dt>
<dd>true on success, or false on failure.</dd>
</dl>
<div class="fields"> <p><strong>Note:</strong>
If no record corresponds to the key, false is returned. The cursor
is moved to the next record implicitly.
</p>
</div></td></tr></table>
</div>
<a name="get_key"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">get_key</span>(<span class="sig-arg">self</span>,
<span class="sig-arg">step</span>=<span class="sig-default">False</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
<p>Get the key of the current record.</p>
<dl class="fields">
<dt>Parameters:</dt>
<dd><ul class="nomargin-top">
<li><strong class="pname"><code>step</code></strong> - true to move the cursor to the next record, or false for no move.</li>
</ul></dd>
<dt>Returns:</dt>
<dd>the key of the current record, or None on failure.</dd>
</dl>
<div class="fields"> <p><strong>Note:</strong>
If the cursor is invalidated, None is returned.
</p>
</div></td></tr></table>
</div>
<a name="get_key_str"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">get_key_str</span>(<span class="sig-arg">self</span>,
<span class="sig-arg">step</span>=<span class="sig-default">False</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
<p>Get the key of the current record.</p>
<dl class="fields">
</dl>
<div class="fields"> <p><strong>Note:</strong>
Equal to the original Cursor::get_key method except that the return
value is string.
</p>
</div></td></tr></table>
</div>
<a name="get_value"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">get_value</span>(<span class="sig-arg">self</span>,
<span class="sig-arg">step</span>=<span class="sig-default">False</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
<p>Get the value of the current record.</p>
<dl class="fields">
<dt>Parameters:</dt>
<dd><ul class="nomargin-top">
<li><strong class="pname"><code>step</code></strong> - true to move the cursor to the next record, or false for no move.</li>
</ul></dd>
<dt>Returns:</dt>
<dd>the value of the current record, or None on failure.</dd>
</dl>
<div class="fields"> <p><strong>Note:</strong>
If the cursor is invalidated, None is returned.
</p>
</div></td></tr></table>
</div>
<a name="get_value_str"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">get_value_str</span>(<span class="sig-arg">self</span>,
<span class="sig-arg">step</span>=<span class="sig-default">False</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
<p>Get the value of the current record.</p>
<dl class="fields">
</dl>
<div class="fields"> <p><strong>Note:</strong>
Equal to the original Cursor::get_value method except that the
return value is string.
</p>
</div></td></tr></table>
</div>
<a name="get"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">get</span>(<span class="sig-arg">self</span>,
<span class="sig-arg">step</span>=<span class="sig-default">False</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
<p>Get a pair of the key and the value of the current record.</p>
<dl class="fields">
<dt>Parameters:</dt>
<dd><ul class="nomargin-top">
<li><strong class="pname"><code>step</code></strong> - true to move the cursor to the next record, or false for no move.</li>
</ul></dd>
<dt>Returns:</dt>
<dd>a pair of the key and the value of the current record, or None on
failure.</dd>
</dl>
<div class="fields"> <p><strong>Note:</strong>
If the cursor is invalidated, None is returned.
</p>
</div></td></tr></table>
</div>
<a name="get_str"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">get_str</span>(<span class="sig-arg">self</span>,
<span class="sig-arg">step</span>=<span class="sig-default">False</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
<p>Get a pair of the key and the value of the current record.</p>
<dl class="fields">
</dl>
<div class="fields"> <p><strong>Note:</strong>
Equal to the original Cursor::get method except that the return
value is string.
</p>
</div></td></tr></table>
</div>
<a name="seize"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">seize</span>(<span class="sig-arg">self</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
<p>Get a pair of the key and the value of the current record and remove
it atomically.</p>
<dl class="fields">
<dt>Returns:</dt>
<dd>a pair of the key and the value of the current record, or None on
failure.</dd>
</dl>
<div class="fields"> <p><strong>Note:</strong>
If the cursor is invalidated, None is returned. The cursor is
moved to the next record implicitly.
</p>
</div></td></tr></table>
</div>
<a name="seize_str"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">seize_str</span>(<span class="sig-arg">self</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
<p>Get a pair of the key and the value of the current record and remove
it atomically.</p>
<dl class="fields">
</dl>
<div class="fields"> <p><strong>Note:</strong>
Equal to the original Cursor::seize method except that the return
value is string.
</p>
</div></td></tr></table>
</div>
<a name="jump"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">jump</span>(<span class="sig-arg">self</span>,
<span class="sig-arg">key</span>=<span class="sig-default">None</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
<p>Jump the cursor to a record for forward scan.</p>
<dl class="fields">
<dt>Parameters:</dt>
<dd><ul class="nomargin-top">
<li><strong class="pname"><code>key</code></strong> - the key of the destination record. If it is None, the
destination is the first record.</li>
</ul></dd>
<dt>Returns:</dt>
<dd>true on success, or false on failure.</dd>
</dl>
</td></tr></table>
</div>
<a name="jump_back"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">jump_back</span>(<span class="sig-arg">self</span>,
<span class="sig-arg">key</span>=<span class="sig-default">None</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
<p>Jump the cursor to a record for backward scan.</p>
<dl class="fields">
<dt>Parameters:</dt>
<dd><ul class="nomargin-top">
<li><strong class="pname"><code>key</code></strong> - the key of the destination record. If it is None, the
destination is the last record.</li>
</ul></dd>
<dt>Returns:</dt>
<dd>true on success, or false on failure.</dd>
</dl>
<div class="fields"> <p><strong>Note:</strong>
This method is dedicated to tree databases. Some database types,
especially hash databases, will provide a dummy implementation.
</p>
</div></td></tr></table>
</div>
<a name="step"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">step</span>(<span class="sig-arg">self</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
<p>Step the cursor to the next record.</p>
<dl class="fields">
<dt>Returns:</dt>
<dd>true on success, or false on failure.</dd>
</dl>
</td></tr></table>
</div>
<a name="step_back"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">step_back</span>(<span class="sig-arg">self</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
<p>Step the cursor to the previous record.</p>
<dl class="fields">
<dt>Returns:</dt>
<dd>true on success, or false on failure.</dd>
</dl>
<div class="fields"> <p><strong>Note:</strong>
This method is dedicated to tree databases. Some database types,
especially hash databases, may provide a dummy implementation.
</p>
</div></td></tr></table>
</div>
<a name="db"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">db</span>(<span class="sig-arg">self</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
<p>Get the database object.</p>
<dl class="fields">
<dt>Returns:</dt>
<dd>the database object.</dd>
</dl>
</td></tr></table>
</div>
<a name="error"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">error</span>(<span class="sig-arg">self</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
<p>Get the last happened error.</p>
<dl class="fields">
<dt>Returns:</dt>
<dd>the last happened error.</dd>
</dl>
</td></tr></table>
</div>
<a name="__repr__"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">__repr__</span>(<span class="sig-arg">self</span>)</span>
<br /><em class="fname">(Representation operator)</em>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
<p>Get the representing expression.</p>
<dl class="fields">
<dt>Returns:</dt>
<dd>the representing expression.</dd>
</dl>
</td></tr></table>
</div>
<a name="__str__"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">__str__</span>(<span class="sig-arg">self</span>)</span>
<br /><em class="fname">(Informal representation operator)</em>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
<p>Get the string expression.</p>
<dl class="fields">
<dt>Returns:</dt>
<dd>the string expression.</dd>
</dl>
</td></tr></table>
</div>
<a name="__next__"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">__next__</span>(<span class="sig-arg">self</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
<p>Get the next key.</p>
<dl class="fields">
<dt>Returns:</dt>
<dd>the next key, or None on failure.</dd>
</dl>
</td></tr></table>
</div>
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