heapfilepage.html

数据库实现的一个源码包

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<CODE>&nbsp;<A HREF="../../neustore/base/Data.html" title="interface in neustore.base">Data</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../neustore/heapfile/HeapFilePage.html#search(neustore.base.Key)">search</A></B>(<A HREF="../../neustore/base/Key.html" title="interface in neustore.base">Key</A>&nbsp;key)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Searches for a record in the page.</TD>
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<TD><B>Methods inherited from class java.lang.Object</B></TD>
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<TD><CODE>equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</CODE></TD>
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<!-- ========= CONSTRUCTOR DETAIL ======== -->

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<B>Constructor Detail</B></FONT></TD>
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<A NAME="HeapFilePage(int, neustore.base.Key, neustore.base.Data)"><!-- --></A><H3>
HeapFilePage</H3>
<PRE>
public <B>HeapFilePage</B>(int&nbsp;_pageSize,
                    <A HREF="../../neustore/base/Key.html" title="interface in neustore.base">Key</A>&nbsp;_sampleKey,
                    <A HREF="../../neustore/base/Data.html" title="interface in neustore.base">Data</A>&nbsp;_sampleData)</PRE>
<DL>
<DD>Constructor fo HeapFilePage. Similar to the constructor of <A HREF="../../neustore/heapfile/HeapFile.html" title="class in neustore.heapfile"><CODE>HeapFile</CODE></A>, 
 here a sample key and a sample data are taken to enable the generic feature
 of the index.
<P>
<DT><B>Parameters:</B><DD><CODE>_pageSize</CODE> - page size<DD><CODE>_sampleKey</CODE> - a sample key<DD><CODE>_sampleData</CODE> - a sample data</DL>

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<A NAME="numRecs()"><!-- --></A><H3>
numRecs</H3>
<PRE>
public int <B>numRecs</B>()</PRE>
<DL>
<DD>Returns the number of records in the page.
<P>
<DD><DL>

<DT><B>Returns:</B><DD>number of records</DL>
</DD>
</DL>
<HR>

<A NAME="isFull()"><!-- --></A><H3>
isFull</H3>
<PRE>
public boolean <B>isFull</B>()</PRE>
<DL>
<DD>Whether the page is full.
<P>
<DD><DL>

<DT><B>Returns:</B><DD>whether full</DL>
</DD>
</DL>
<HR>

<A NAME="insert(neustore.base.Key, neustore.base.Data)"><!-- --></A><H3>
insert</H3>
<PRE>
public void <B>insert</B>(<A HREF="../../neustore/base/Key.html" title="interface in neustore.base">Key</A>&nbsp;key,
                   <A HREF="../../neustore/base/Data.html" title="interface in neustore.base">Data</A>&nbsp;data)</PRE>
<DL>
<DD>Inserts a new record into this page. The caller needs to make sure that
 the page has enough space.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>key</CODE> - the key part of the new record<DD><CODE>data</CODE> - the data part of the new record</DL>
</DD>
</DL>
<HR>

<A NAME="search(neustore.base.Key)"><!-- --></A><H3>
search</H3>
<PRE>
public <A HREF="../../neustore/base/Data.html" title="interface in neustore.base">Data</A> <B>search</B>(<A HREF="../../neustore/base/Key.html" title="interface in neustore.base">Key</A>&nbsp;key)</PRE>
<DL>
<DD>Searches for a record in the page.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>key</CODE> - the key to search for
<DT><B>Returns:</B><DD>the data if found; null otherwise.</DL>
</DD>
</DL>
<HR>

<A NAME="delete(neustore.base.Key)"><!-- --></A><H3>
delete</H3>
<PRE>
public boolean <B>delete</B>(<A HREF="../../neustore/base/Key.html" title="interface in neustore.base">Key</A>&nbsp;key)</PRE>
<DL>
<DD>Deletes a record from the page.
 It is the caller's responsibility to free an empty page.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>key</CODE> - the key to delete
<DT><B>Returns:</B><DD>whether deleted</DL>
</DD>
</DL>
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