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DatabaseEntry (Oracle - Berkeley DB Java API)
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Berkeley DB version 4.7.25
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<H2>

com.sleepycat.db
 
Class DatabaseEntry</H2>
<PRE>
<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">java.lang.Object</A>
 <IMG SRC="../../../resources/inherit.gif" ALT="extended by ">com.sleepycat.db.DatabaseEntry
</PRE>
<DL>
<DT>Direct Known Subclasses: <DD><A HREF="../../../com/sleepycat/db/MultipleEntry.html" title="class in com.sleepycat.db">MultipleEntry</A></DD>
</DL>
<HR>
<DL>
<DT><PRE>public class DatabaseEntry<DT>extends <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A></DL>
</PRE>

Encodes database key and data items as a byte array.

Storage and retrieval for the <A HREF="../../../com/sleepycat/db/Database.html" title="class in com.sleepycat.db"><CODE>Database</CODE></A> and <A HREF="../../../com/sleepycat/db/Cursor.html" title="class in com.sleepycat.db"><CODE>Cursor</CODE></A> methods
are based on key/data pairs. Both key and data items are represented by
DatabaseEntry objects. Key and data byte arrays may refer to arrays of zero
length up to arrays of essentially unlimited length.

The DatabaseEntry class provides simple access to an underlying object whose
elements can be examined or changed. DatabaseEntry objects can be
subclassed, providing a way to associate with it additional data or
references to other structures.

Access to DatabaseEntry objects is not re-entrant. In particular, if
multiple threads simultaneously access the same DatabaseEntry object using
<A HREF="../../../com/sleepycat/db/Database.html" title="class in com.sleepycat.db"><CODE>Database</CODE></A> or <A HREF="../../../com/sleepycat/db/Cursor.html" title="class in com.sleepycat.db"><CODE>Cursor</CODE></A> methods, the results are undefined.

DatabaseEntry objects may be used in conjunction with the object mapping
support provided in the <A HREF="../../../com/sleepycat/bind/package-summary.html"><CODE>com.sleepycat.bind</CODE></A> package.

<h3>Input and Output Parameters</h3>

DatabaseEntry objects are used for both input data (when writing to a
database or specifying a search parameter) and output data (when reading
from a database). For certain methods, one parameter may be an input
parameter and another may be an output parameter. For example, the
<A HREF="../../../com/sleepycat/db/Database.html#get(com.sleepycat.db.Transaction, com.sleepycat.db.DatabaseEntry, com.sleepycat.db.DatabaseEntry, com.sleepycat.db.LockMode)"><CODE>Database.get(com.sleepycat.db.Transaction, com.sleepycat.db.DatabaseEntry, com.sleepycat.db.DatabaseEntry, com.sleepycat.db.LockMode)</CODE></A> method has an input key parameter and an output
data parameter. The documentation for each method describes whether its
parameters are input or output parameters.

For DatabaseEntry input parameters, the caller is responsible for
initializing the data array of the DatabaseEntry. For DatabaseEntry
output parameters, the method called will initialize the data array.

For DatabaseEntry output parameters, by default the method called will
reuse the byte array in the DatabaseEntry, if the data returned fits in
the byte array. This behavior can be configured with <A HREF="../../../com/sleepycat/db/DatabaseEntry.html#setReuseBuffer(boolean)"><CODE>setReuseBuffer(boolean)</CODE></A> or <A HREF="../../../com/sleepycat/db/DatabaseEntry.html#setUserBuffer(int, boolean)"><CODE>setUserBuffer(int, boolean)</CODE></A>. If an entry is configured to
reuse the byte array (the default behavior), the length of the underlying
byte array should not be used to determine the amount of data returned each
time the entry is used as an output parameter, rather the <A HREF="../../../com/sleepycat/db/DatabaseEntry.html#getSize()"><CODE>getSize()</CODE></A>
call should be used. If an entry is configured to not reuse the byte array,
a new array is allocated each time the entry is used as an output parameter,
 so
the application can safely keep a reference to the byte array returned
by <A HREF="../../../com/sleepycat/db/DatabaseEntry.html#getData()"><CODE>getData()</CODE></A> without danger that the array will be overwritten in
a subsequent call.

<h3>Offset and Size Properties</h3>

By default the Offset property is zero and the Size property is the length
of the byte array. However, to allow for optimizations involving the
partial use of a byte array, the Offset and Size may be set to non-default
values.

For DatabaseEntry output parameters, the Size will always be set to the
length of the returned data and
the Offset will always be set to zero.

However, for DatabaseEntry input parameters the Offset and Size are set to
non-default values by the built-in tuple and serial bindings. For example,
with a tuple or serial binding the byte array is grown dynamically as data
is output, and the Size is set to the number of bytes actually used. For a
serial binding, the Offset is set to a non-zero value in order to implement
an optimization having to do with the serialization stream header.

Therefore, for output DatabaseEntry parameters the application can assume
that the Offset is zero and the Size is the length of the byte array.
However, for input DatabaseEntry parameters the application should not make
this assumption. In general, it is safest for the application to always
honor the Size and Offset properties, rather than assuming they have default
values.

<h3>Partial Offset and Length Properties</h3>

By default the specified data (byte array, offset and size) corresponds to
the full stored key or data item. Optionally, the Partial property can be
set to true, and the PartialOffset and PartialLength properties are used to
specify the portion of the key or data item to be read or written. For
details, see the <A HREF="../../../com/sleepycat/db/DatabaseEntry.html#setPartial(int, int, boolean)"><CODE>setPartial(int,int,boolean)</CODE></A> method.

Note that the Partial properties are set only by the caller. They will
never be set by a Database or Cursor method, nor will they every be set by
bindings. Therefore, the application can assume that the Partial properties
are not set, unless the application itself sets them explicitly.

<HR>

<A NAME="constructor_summary"></A>
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<TH ALIGN="left" COLSPAN="2">
Constructor Summary</TH>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../../com/sleepycat/db/DatabaseEntry.html#DatabaseEntry()">DatabaseEntry</A>()</CODE>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Construct a DatabaseEntry with null data.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../../com/sleepycat/db/DatabaseEntry.html#DatabaseEntry(byte[])">DatabaseEntry</A>(byte[]&nbsp;data)</CODE>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Construct a DatabaseEntry with a given byte array.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../../com/sleepycat/db/DatabaseEntry.html#DatabaseEntry(byte[], int, int)">DatabaseEntry</A>(byte[]&nbsp;data,
 int&nbsp;offset,
 int&nbsp;size)</CODE>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Constructs a DatabaseEntry with a given byte array, offset and size.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../../com/sleepycat/db/DatabaseEntry.html#DatabaseEntry(java.nio.ByteBuffer)">DatabaseEntry</A>(<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/nio/ByteBuffer.html" title="class or interface in java.nio">ByteBuffer</A>&nbsp;data)</CODE>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Construct a DatabaseEntry with a given native I/O buffer.</TD>
</TR>
</TABLE>
&nbsp;

<A NAME="method_summary"></A>
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Method Summary</TH>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%">
<CODE>&nbsp;boolean</CODE></TD>
<TD><CODE><A HREF="../../../com/sleepycat/db/DatabaseEntry.html#equals(java.lang.Object)">equals</A>(<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A>&nbsp;o)</CODE>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Compares the data of two entries for byte-by-byte equality.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%">
<CODE>&nbsp;byte[]</CODE></TD>
<TD><CODE><A HREF="../../../com/sleepycat/db/DatabaseEntry.html#getData()">getData</A>()</CODE>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Return the byte array.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%">
<CODE>&nbsp;<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/nio/ByteBuffer.html" title="class or interface in java.nio">ByteBuffer</A></CODE></TD>
<TD><CODE><A HREF="../../../com/sleepycat/db/DatabaseEntry.html#getDataNIO()">getDataNIO</A>()</CODE>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Return the java.nio.ByteBuffer.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%">
<CODE>&nbsp;int</CODE></TD>
<TD><CODE><A HREF="../../../com/sleepycat/db/DatabaseEntry.html#getOffset()">getOffset</A>()</CODE>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Return the byte offset into the data array.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%">
<CODE>&nbsp;boolean</CODE></TD>
<TD><CODE><A HREF="../../../com/sleepycat/db/DatabaseEntry.html#getPartial()">getPartial</A>()</CODE>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Return whether this DatabaseEntry is configured to read or write partial
 records.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%">
<CODE>&nbsp;int</CODE></TD>
<TD><CODE><A HREF="../../../com/sleepycat/db/DatabaseEntry.html#getPartialLength()">getPartialLength</A>()</CODE>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Return the byte length of the partial record being read or written by
 the application, in bytes.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%">
<CODE>&nbsp;int</CODE></TD>
<TD><CODE><A HREF="../../../com/sleepycat/db/DatabaseEntry.html#getPartialOffset()">getPartialOffset</A>()</CODE>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Return the offset of the partial record being read or written by the
 application, in bytes.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%">
<CODE>&nbsp;int</CODE></TD>
<TD><CODE><A HREF="../../../com/sleepycat/db/DatabaseEntry.html#getRecordNumber()">getRecordNumber</A>()</CODE>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Return the record number encoded in this entry's buffer.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%">
<CODE>&nbsp;boolean</CODE></TD>
<TD><CODE><A HREF="../../../com/sleepycat/db/DatabaseEntry.html#getReuseBuffer()">getReuseBuffer</A>()</CODE>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Return true if the whether the entry is configured to reuse the buffer.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%">
<CODE>&nbsp;int</CODE></TD>
<TD><CODE><A HREF="../../../com/sleepycat/db/DatabaseEntry.html#getSize()">getSize</A>()</CODE>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Return the byte size of the data array.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%">
<CODE>&nbsp;boolean</CODE></TD>
<TD><CODE><A HREF="../../../com/sleepycat/db/DatabaseEntry.html#getUserBuffer()">getUserBuffer</A>()</CODE>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Return true if the whether the buffer in this entry is owned by the
 application.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%">
<CODE>&nbsp;int</CODE></TD>
<TD><CODE><A HREF="../../../com/sleepycat/db/DatabaseEntry.html#getUserBufferLength()">getUserBufferLength</A>()</CODE>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Return the length of the application's buffer.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%">
<CODE>&nbsp;int</CODE></TD>
<TD><CODE><A HREF="../../../com/sleepycat/db/DatabaseEntry.html#hashCode()">hashCode</A>()</CODE>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns a hash code based on the data value.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%">
<CODE>&nbsp;void</CODE></TD>
<TD><CODE><A HREF="../../../com/sleepycat/db/DatabaseEntry.html#setData(byte[])">setData</A>(byte[]&nbsp;data)</CODE>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Sets the byte array.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%">
<CODE>&nbsp;void</CODE></TD>
<TD><CODE><A HREF="../../../com/sleepycat/db/DatabaseEntry.html#setData(byte[], int, int)">setData</A>(byte[]&nbsp;data,
 int&nbsp;offset,
 int&nbsp;size)</CODE>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Sets the byte array, offset and size.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%">
<CODE>&nbsp;void</CODE></TD>
<TD><CODE><A HREF="../../../com/sleepycat/db/DatabaseEntry.html#setDataNIO(java.nio.ByteBuffer)">setDataNIO</A>(<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/nio/ByteBuffer.html" title="class or interface in java.nio">ByteBuffer</A>&nbsp;data)</CODE>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Sets the java.nio.ByteBuffer.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%">
<CODE>&nbsp;void</CODE></TD>
<TD><CODE><A HREF="../../../com/sleepycat/db/DatabaseEntry.html#setDataNIO(java.nio.ByteBuffer, int, int)">setDataNIO</A>(<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/nio/ByteBuffer.html" title="class or interface in java.nio">ByteBuffer</A>&nbsp;data,
 int&nbsp;offset,
 int&nbsp;size)</CODE>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Set the byte offset into the data array.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%">
<CODE>&nbsp;void</CODE></TD>
<TD><CODE><A HREF="../../../com/sleepycat/db/DatabaseEntry.html#setPartial(boolean)">setPartial</A>(boolean&nbsp;partial)</CODE>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Configure this DatabaseEntry to read or write partial records.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%">
<CODE>&nbsp;void</CODE></TD>
<TD><CODE><A HREF="../../../com/sleepycat/db/DatabaseEntry.html#setPartial(int, int, boolean)">setPartial</A>(int&nbsp;doff,
 int&nbsp;dlen,
 boolean&nbsp;partial)</CODE>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Configures this DatabaseEntry to read or write partial records.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%">
<CODE>&nbsp;void</CODE></TD>
<TD><CODE><A HREF="../../../com/sleepycat/db/DatabaseEntry.html#setPartialLength(int)">setPartialLength</A>(int&nbsp;dlen)</CODE>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Set the byte length of the partial record being read or written by
 the application, in bytes.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%">
<CODE>&nbsp;void</CODE></TD>
<TD><CODE><A HREF="../../../com/sleepycat/db/DatabaseEntry.html#setPartialOffset(int)">setPartialOffset</A>(int&nbsp;doff)</CODE>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Set the offset of the partial record being read or written by the
 application, in bytes.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%">
<CODE>&nbsp;void</CODE></TD>
<TD><CODE><A HREF="../../../com/sleepycat/db/DatabaseEntry.html#setRecordNumber(int)">setRecordNumber</A>(int&nbsp;recno)</CODE>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Initialize the entry from a logical record number.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%">
<CODE>&nbsp;void</CODE></TD>
<TD><CODE><A HREF="../../../com/sleepycat/db/DatabaseEntry.html#setReuseBuffer(boolean)">setReuseBuffer</A>(boolean&nbsp;reuse)</CODE>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Configures the entry to try to reuse the buffer before allocating a new
 one.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%">
<CODE>&nbsp;void</CODE></TD>
<TD><CODE><A HREF="../../../com/sleepycat/db/DatabaseEntry.html#setSize(int)">setSize</A>(int&nbsp;size)</CODE>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Set the byte size of the data array.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%">
<CODE>&nbsp;void</CODE></TD>
<TD><CODE><A HREF="../../../com/sleepycat/db/DatabaseEntry.html#setUserBuffer(int, boolean)">setUserBuffer</A>(int&nbsp;length,
 boolean&nbsp;usermem)</CODE>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Configures the entry with an application-owned buffer.</TD>
</TR>
</TABLE>
&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"></A>
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Constructor Detail</TH>
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<A NAME="DatabaseEntry()"></A><H3>
DatabaseEntry</H3>
<PRE>
public DatabaseEntry()</PRE>
<DL>
<DD>Construct a DatabaseEntry with null data. The offset and size are set to
 zero.

</DL>
<HR>

<A NAME="DatabaseEntry(byte[])"></A><H3>
DatabaseEntry</H3>
<PRE>
public DatabaseEntry(byte[]&nbsp;data)</PRE>
<DL>
<DD>Construct a DatabaseEntry with a given byte array. The offset is
 set to zero; the size is set to the length of the array, or to zero if
 null is passed.
 

<DL>
<DT>Parameters:<DD><CODE>data</CODE> - Byte array wrapped by the DatabaseEntry.</DL>
</DL>
<HR>

<A NAME="DatabaseEntry(byte[], int, int)"></A><H3>
DatabaseEntry</H3>
<PRE>
public DatabaseEntry(byte[]&nbsp;data,
 int&nbsp;offset,
 int&nbsp;size)</PRE>
<DL>
<DD>Constructs a DatabaseEntry with a given byte array, offset and size.
 

<DL>
<DT>Parameters:<DD><CODE>data</CODE> - Byte array wrapped by the DatabaseEntry.<DD><CODE>offset</CODE> - Offset in the first byte in the byte array to be included.<DD><CODE>size</CODE> - Number of bytes in the byte array to be included.</DL>
</DL>
<HR>

<A NAME="DatabaseEntry(java.nio.ByteBuffer)"></A><H3>
DatabaseEntry</H3>
<PRE>
public DatabaseEntry(<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/nio/ByteBuffer.html" title="class or interface in java.nio">ByteBuffer</A>&nbsp;data)</PRE>
<DL>
<DD>Construct a DatabaseEntry with a given native I/O buffer.
 

<DL>
<DT>Parameters:<DD><CODE>data</CODE> - NIO byte buffer wrapped by the DatabaseEntry.</DL>
</DL>

<A NAME="method_detail"></A>
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Method Detail</TH>
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<A NAME="getData()"></A><H3>
getData</H3>
<PRE>
public byte[] getData()</PRE>
<DL>
<DD>Return the byte array.
 
 For a DatabaseEntry that is used as an output parameter, the byte
 array will always be a newly allocated array. The byte array specified
 by the caller will not be used and may be null.
 

<DD><DL>

<DT>Returns:<DD>The byte array.</DL>
</DD>
</DL>
<HR>

<A NAME="getDataNIO()"></A><H3>
getDataNIO</H3>
<PRE>
public <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/nio/ByteBuffer.html" title="class or interface in java.nio">ByteBuffer</A> getDataNIO()</PRE>
<DL>
<DD>Return the java.nio.ByteBuffer.
 
 Used to access the underlying data when the DatabaseEntry is
 configured to utilize a java.nio.ByteBuffer.
 

<DD><DL>

<DT>Returns:<DD>The underlying java.nio.ByteBuffer.</DL>
</DD>
</DL>
<HR>

<A NAME="setData(byte[], int, int)"></A><H3>
setData</H3>
<PRE>
public void setData(byte[]&nbsp;data,
 int&nbsp;offset,
 int&nbsp;size)</PRE>
<DL>
<DD>Sets the byte array, offset and size.
 

<DD><DL>
<DT>Parameters:<DD><CODE>data</CODE> - Byte array wrapped by the DatabaseEntry.<DD><CODE>offset</CODE> - Offset in the first byte in the byte array to be included.<DD><CODE>size</CODE> - Number of bytes in the byte array to be included.</DL>
</DD>
</DL>
<HR>

<A NAME="setData(byte[])"></A><H3>
setData</H3>
<PRE>
public void setData(byte[]&nbsp;data)</PRE>
<DL>
<DD>Sets the byte array. The offset is set to zero; the size is set to the
 length of the array, or to zero if null is passed.
 

<DD><DL>
<DT>Parameters:<DD><CODE>data</CODE> - Byte array wrapped by the DatabaseEntry.</DL>
</DD>
</DL>
<HR>

<A NAME="setDataNIO(java.nio.ByteBuffer, int, int)"></A><H3>
setDataNIO</H3>
<PRE>
public void setDataNIO(<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/nio/ByteBuffer.html" title="class or interface in java.nio">ByteBuffer</A>&nbsp;data,
 int&nbsp;offset,
 int&nbsp;size)</PRE>
<DL>
<DD>Sets the java.nio.ByteBuffer. The offset is set to zero; the size
 is set to the length of the ByteBuffer, or to zero if null is passed.
 

<DD><DL>
<DT>Parameters:<DD><CODE>data</CODE> - java.nio.ByteBuffer wrapped by the DatabaseEntry.<DD><CODE>offset</CODE> - int offset into the ByteBuffer where the DatabaseEntry data begins.<DD><CODE>size</CODE> - int size of the ByteBuffer available.</DL>
</DD>
</DL>
<HR>

<A NAME="setDataNIO(java.nio.ByteBuffer)"></A><H3>
setDataNIO</H3>
<PRE>
public void setDataNIO(<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/nio/ByteBuffer.html" title="class or interface in java.nio">ByteBuffer</A>&nbsp;data)</PRE>
<DL>
<DD>Sets the java.nio.ByteBuffer. The offset is set to zero; the size
 is set to the length of the ByteBuffer, or to zero if null is passed.
 

<DD><DL>
<DT>Parameters:<DD><CODE>data</CODE> - java.nio.ByteBuffer wrapped by the DatabaseEntry.</DL>
</DD>
</DL>
<HR>

<A NAME="getOffset()"></A><H3>
getOffset</H3>
<PRE>
public int getOffset()</PRE>
<DL>
<DD>Return the byte offset into the data array.
 
 For a DatabaseEntry that is used as an output parameter, the offset
 will always be zero.
 

<DD><DL>

<DT>Returns:<DD>Offset in the first byte in the byte array to be included.</DL>
</DD>
</DL>
<HR>

<A NAME="setOffset(int)"></A><H3>
setOffset</H3>
<PRE>
public void setOffset(int&nbsp;offset)</PRE>
<DL>
<DD>Set the byte offset into the data array.
 

<DD><DL>
<DT>Parameters:<DD><CODE>offset</CODE> - Offset in the first byte in the byte array to be included.</DL>
</DD>
</DL>
<HR>

<A NAME="getPartialLength()"></A><H3>
getPartialLength</H3>
<PRE>
public int getPartialLength()</PRE>
<DL>
<DD>Return the byte length of the partial record being read or written by
 the application, in bytes.
 
 Note that the Partial properties are set only by the caller. They
 will never be set by a Database or Cursor method.
 

<DD><DL>

<DT>Returns:<DD>The byte length of the partial record being read or written by the
 application, in bytes.
 <DT>See Also:<DD><A HREF="../../../com/sleepycat/db/DatabaseEntry.html#setPartial(int, int, boolean)"><CODE>setPartial(int,int,boolean)</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="getPartialOffset()"></A><H3>
getPartialOffset</H3>
<PRE>
public int getPartialOffset()</PRE>
<DL>
<DD>Return the offset of the partial record being read or written by the
 application, in bytes.
 
 Note that the Partial properties are set only by the caller. They
 will never be set by a Database or Cursor method.
 

<DD><DL>

<DT>Returns:<DD>The offset of the partial record being read or written by the
 application, in bytes.
 <DT>See Also:<DD><A HREF="../../../com/sleepycat/db/DatabaseEntry.html#setPartial(int, int, boolean)"><CODE>setPartial(int,int,boolean)</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="getPartial()"></A><H3>
getPartial</H3>
<PRE>
public boolean getPartial()</PRE>
<DL>
<DD>Return whether this DatabaseEntry is configured to read or write partial
 records.
 
 Note that the Partial properties are set only by the caller. They
 will never be set by a Database or Cursor method.
 

<DD><DL>

<DT>Returns:<DD>Whether this DatabaseEntry is configured to read or write partial
 records.
 <DT>See Also:<DD><A HREF="../../../com/sleepycat/db/DatabaseEntry.html#setPartial(int, int, boolean)"><CODE>setPartial(int,int,boolean)</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="setPartialOffset(int)"></A><H3>
setPartialOffset</H3>
<PRE>
public void setPartialOffset(int&nbsp;doff)</PRE>
<DL>
<DD>Set the offset of the partial record being read or written by the
 application, in bytes.
 
 Note that the Partial properties are set only by the caller. They
 will never be set by a Database or Cursor method.
 

<DD><DL>
<DT>Parameters:<DD><CODE>doff</CODE> - The offset of the partial record being read or written by the
 application, in bytes.
 <DT>See Also:<DD><A HREF="../../../com/sleepycat/db/DatabaseEntry.html#setPartial(int, int, boolean)"><CODE>setPartial(int,int,boolean)</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="setPartialLength(int)"></A><H3>
setPartialLength</H3>
<PRE>
public void setPartialLength(int&nbsp;dlen)</PRE>
<DL>
<DD>Set the byte length of the partial record being read or written by
 the application, in bytes.
 
 Note that the Partial properties are set only by the caller. They
 will never be set by a Database or Cursor method.
 

<DD><DL>
<DT>Parameters:<DD><CODE>dlen</CODE> - The byte length of the partial record being read or written by the
 <DT>See Also:<DD><A HREF="../../../com/sleepycat/db/DatabaseEntry.html#setPartial(int, int, boolean)"><CODE>application, in bytes.</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="setPartial(boolean)"></A><H3>
setPartial</H3>
<PRE>
public void setPartial(boolean&nbsp;partial)</PRE>
<DL>
<DD>Configure this DatabaseEntry to read or write partial records.
 
 Note that the Partial properties are set only by the caller. They
 will never be set by a Database or Cursor method.
 

<DD><DL>
<DT>Parameters:<DD><CODE>partial</CODE> - Whether this DatabaseEntry is configured to read or write partial
 records.
 <DT>See Also:<DD><A HREF="../../../com/sleepycat/db/DatabaseEntry.html#setPartial(int, int, boolean)"><CODE>setPartial(int,int,boolean)</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="setPartial(int, int, boolean)"></A><H3>
setPartial</H3>
<PRE>
public void setPartial(int&nbsp;doff,
 int&nbsp;dlen,
 boolean&nbsp;partial)</PRE>
<DL>
<DD>Configures this DatabaseEntry to read or write partial records.
 
 Do partial retrieval or storage of an item. If the calling
 application is doing a retrieval, length bytes specified by
 <tt>dlen</tt>, starting at the offset set by <tt>doff</tt> bytes from
 the beginning of the retrieved data record are returned as if they
 comprised the entire record. If any or all of the specified bytes do
 not exist in the record, the get is successful, and any existing bytes
 are returned.
 
 For example, if the data portion of a retrieved record was 100 bytes,
 and a partial retrieval was done using a DatabaseEntry having a partial
 length of 20 and a partial offset of 85, the retrieval would succeed and
 the retrieved data would be the last 15 bytes of the record.
 
 If the calling application is storing an item, length bytes specified
 by <tt>dlen</tt>, starting at the offset set by <tt>doff</tt>
 bytes from the beginning of the specified key's data item are replaced
 by the data specified by the DatabaseEntry. If the partial length is
 smaller than the data, the record will grow; if the partial length is
 larger than the data, the record will shrink. If the specified bytes do
 not exist, the record will be extended using nul bytes as necessary, and
 the store will succeed.
 
 It is an error to specify a partial key when performing a put
 operation of any kind.
 
 It is an error to attempt a partial store using the <A HREF="../../../com/sleepycat/db/Database.html#put(com.sleepycat.db.Transaction, com.sleepycat.db.DatabaseEntry, com.sleepycat.db.DatabaseEntry)"><CODE>Database.put</CODE></A> method in a database that supports duplicate records. Partial
 stores in databases supporting duplicate records must be done using a
 cursor method.
 
 Note that the Partial properties are set only by the caller. They
 will never be set by a Database or Cursor method.
 

<DD><DL>
<DT>Parameters:<DD><CODE>doff</CODE> - The offset of the partial record being read or written by the
 application, in bytes.
 <DD><CODE>dlen</CODE> - The byte length of the partial record being read or written by the
 application, in bytes.
 <DD><CODE>partial</CODE> - Whether this DatabaseEntry is configured to read or write partial
 records.</DL>
</DD>
</DL>
<HR>

<A NAME="getRecordNumber()"></A><H3>
getRecordNumber</H3>
<PRE>
public int getRecordNumber()</PRE>
<DL>
<DD>Return the record number encoded in this entry's buffer.

This method may be called at any time during the life of the application.


<DD><DL>

<DT>Returns:<DD>The record number encoded in this entry's buffer.</DL>
</DD>
</DL>
<HR>

<A NAME="setRecordNumber(int)"></A><H3>
setRecordNumber</H3>
<PRE>
public void setRecordNumber(int&nbsp;recno)</PRE>
<DL>
<DD>Initialize the entry from a logical record number. Record numbers
 are integer keys starting at 1. When this method is called the data,
 size and offset fields are implicitly set to hold a byte array
 representation of the integer key.

<DD><DL>
<DT>Parameters:<DD><CODE>recno</CODE> - the record number to be encoded</DL>
</DD>
</DL>
<HR>

<A NAME="getReuseBuffer()"></A><H3>
getReuseBuffer</H3>
<PRE>
public boolean getReuseBuffer()</PRE>
<DL>
<DD>Return true if the whether the entry is configured to reuse the buffer.

This method may be called at any time during the life of the application.


<DD><DL>

<DT>Returns:<DD>True if the whether the entry is configured to reuse the buffer.</DL>
</DD>
</DL>
<HR>

<A NAME="setReuseBuffer(boolean)"></A><H3>
setReuseBuffer</H3>
<PRE>
public void setReuseBuffer(boolean&nbsp;reuse)</PRE>
<DL>
<DD>Configures the entry to try to reuse the buffer before allocating a new
 one.
 

<DD><DL>
<DT>Parameters:<DD><CODE>reuse</CODE> - whether to reuse the buffer</DL>
</DD>
</DL>
<HR>

<A NAME="getSize()"></A><H3>
getSize</H3>
<PRE>
public int getSize()</PRE>
<DL>
<DD>Return the byte size of the data array.
 
 For a DatabaseEntry that is used as an output parameter, the size
 will always be the length of the data array.
 

<DD><DL>

<DT>Returns:<DD>Number of bytes in the byte array to be included.</DL>
</DD>
</DL>
<HR>

<A NAME="setSize(int)"></A><H3>
setSize</H3>
<PRE>
public void setSize(int&nbsp;size)</PRE>
<DL>
<DD>Set the byte size of the data array.
 

<DD><DL>
<DT>Parameters:<DD><CODE>size</CODE> - Number of bytes in the byte array to be included.</DL>
</DD>
</DL>
<HR>

<A NAME="getUserBuffer()"></A><H3>
getUserBuffer</H3>
<PRE>
public boolean getUserBuffer()</PRE>
<DL>
<DD>Return true if the whether the buffer in this entry is owned by the
 application.

This method may be called at any time during the life of the application.


<DD><DL>

<DT>Returns:<DD>True if the whether the buffer in this entry is owned by the
 application.</DL>
</DD>
</DL>
<HR>

<A NAME="getUserBufferLength()"></A><H3>
getUserBufferLength</H3>
<PRE>
public int getUserBufferLength()</PRE>
<DL>
<DD>Return the length of the application's buffer.

This method may be called at any time during the life of the application.


<DD><DL>

<DT>Returns:<DD>The length of the application's buffer.</DL>
</DD>
</DL>
<HR>

<A NAME="setUserBuffer(int, boolean)"></A><H3>
setUserBuffer</H3>
<PRE>
public void setUserBuffer(int&nbsp;length,
 boolean&nbsp;usermem)</PRE>
<DL>
<DD>Configures the entry with an application-owned buffer.
 
 The <code>data</code> field of the entry must refer to a buffer that is
 at least <code>length</code> bytes in length.
 
 If the length of the requested item is less than or equal to that number
 of bytes, the item is copied into the memory to which the
 <code>data</code> field refers. Otherwise, the <code>size</code> field
 is set to the length needed for the requested item, and a
 <A HREF="../../../com/sleepycat/db/MemoryException.html" title="class in com.sleepycat.db"><CODE>MemoryException</CODE></A> is thrown.
 
 Applications can determine the length of a record by setting
 <code>length</code> to 0 and calling <A HREF="../../../com/sleepycat/db/DatabaseEntry.html#getSize()"><CODE>DatabaseEntry.getSize</CODE></A>
 on the return value.
 

<DD><DL>
<DT>Parameters:<DD><CODE>length</CODE> - the length of the buffer
 <DD><CODE>usermem</CODE> - whether the buffer is owned by the application</DL>
</DD>
</DL>
<HR>

<A NAME="equals(java.lang.Object)"></A><H3>
equals</H3>
<PRE>
public boolean equals(<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A>&nbsp;o)</PRE>
<DL>
<DD>Compares the data of two entries for byte-by-byte equality.

In either entry, if the offset is non-zero or the size is not equal
 to the data array length, then only the data bounded by these values is
 compared. The data array length and offset need not be the same in both
 entries for them to be considered equal.

If the data array is null in one entry, then to be considered equal
 both entries must have a null data array.

If the partial property is set in either entry, then to be considered
 equal both entries must have the same partial properties: partial,
 partialOffset and partialLength.

<DD><DL>
<DT>Overrides:<DD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#equals(java.lang.Object)" title="class or interface in java.lang">equals</A></CODE> in class <CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A></CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="hashCode()"></A><H3>
hashCode</H3>
<PRE>
public int hashCode()</PRE>
<DL>
<DD>Returns a hash code based on the data value.

<DD><DL>
<DT>Overrides:<DD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#hashCode()" title="class or interface in java.lang">hashCode</A></CODE> in class <CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A></CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>

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