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JoinCursor
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com.sleepycat.db</FONT>
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Class JoinCursor</H2>
<PRE>
java.lang.Object
<IMG SRC="../../../resources/inherit.gif" ALT="extended by "><B>com.sleepycat.db.JoinCursor</B>
</PRE>
<HR>
<DL>
<DT><PRE>public class <B>JoinCursor</B><DT>extends java.lang.Object</DL>
</PRE>
<P>
A specialized join cursor for use in performing equality or natural joins on
secondary indices.
<p>
A join cursor is returned when calling <A HREF="../../../com/sleepycat/db/Database.html#join(com.sleepycat.db.Cursor[], com.sleepycat.db.JoinConfig)"><CODE>Database.join</CODE></A>.
<p>
To open a join cursor using two secondary cursors:
<pre>
Transaction txn = ...
Database primaryDb = ...
SecondaryDatabase secondaryDb1 = ...
SecondaryDatabase secondaryDb2 = ...
<p>
SecondaryCursor cursor1 = null;
SecondaryCursor cursor2 = null;
JoinCursor joinCursor = null;
try {
DatabaseEntry key = new DatabaseEntry();
DatabaseEntry data = new DatabaseEntry();
<p>
cursor1 = secondaryDb1.openSecondaryCursor(txn, null);
cursor2 = secondaryDb2.openSecondaryCursor(txn, null);
<p>
key.setData(...); // initialize key for secondary index 1
OperationStatus status1 =
cursor1.getSearchKey(key, data, LockMode.DEFAULT);
key.setData(...); // initialize key for secondary index 2
OperationStatus status2 =
cursor2.getSearchKey(key, data, LockMode.DEFAULT);
<p>
if (status1 == OperationStatus.SUCCESS &&
status2 == OperationStatus.SUCCESS) {
<p>
SecondaryCursor[] cursors = {cursor1, cursor2};
joinCursor = primaryDb.join(cursors, null);
<p>
while (true) {
OperationStatus joinStatus = joinCursor.getNext(key, data,
LockMode.DEFAULT);
if (joinStatus == OperationStatus.SUCCESS) {
// Do something with the key and data.
} else {
break;
}
}
}
} finally {
if (cursor1 != null) {
cursor1.close();
}
if (cursor2 != null) {
cursor2.close();
}
if (joinCursor != null) {
joinCursor.close();
}
}
</pre>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/db/JoinCursor.html#close()">close</A></B>()</CODE>
<BR>
Closes the cursors that have been opened by this join cursor.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../com/sleepycat/db/JoinConfig.html" title="class in com.sleepycat.db">JoinConfig</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/db/JoinCursor.html#getConfig()">getConfig</A></B>()</CODE>
<BR>
Returns this object's configuration.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../com/sleepycat/db/Database.html" title="class in com.sleepycat.db">Database</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/db/JoinCursor.html#getDatabase()">getDatabase</A></B>()</CODE>
<BR>
Returns the primary database handle associated with this cursor.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../com/sleepycat/db/OperationStatus.html" title="class in com.sleepycat.db">OperationStatus</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/db/JoinCursor.html#getNext(com.sleepycat.db.DatabaseEntry, com.sleepycat.db.DatabaseEntry, com.sleepycat.db.LockMode)">getNext</A></B>(<A HREF="../../../com/sleepycat/db/DatabaseEntry.html" title="class in com.sleepycat.db">DatabaseEntry</A> key,
<A HREF="../../../com/sleepycat/db/DatabaseEntry.html" title="class in com.sleepycat.db">DatabaseEntry</A> data,
<A HREF="../../../com/sleepycat/db/LockMode.html" title="class in com.sleepycat.db">LockMode</A> lockMode)</CODE>
<BR>
Returns the next primary key and data resulting from the join operation.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../com/sleepycat/db/OperationStatus.html" title="class in com.sleepycat.db">OperationStatus</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/db/JoinCursor.html#getNext(com.sleepycat.db.DatabaseEntry, com.sleepycat.db.LockMode)">getNext</A></B>(<A HREF="../../../com/sleepycat/db/DatabaseEntry.html" title="class in com.sleepycat.db">DatabaseEntry</A> key,
<A HREF="../../../com/sleepycat/db/LockMode.html" title="class in com.sleepycat.db">LockMode</A> lockMode)</CODE>
<BR>
Returns the next primary key resulting from the join operation.</TD>
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<TH ALIGN="left"><B>Methods inherited from class java.lang.Object</B></TH>
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<TD><CODE>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</CODE></TD>
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<A NAME="close()"><!-- --></A><H3>
close</H3>
<PRE>
public void <B>close</B>()
throws <A HREF="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</A></PRE>
<DL>
<DD>Closes the cursors that have been opened by this join cursor.
<p>
The cursors passed to <A HREF="../../../com/sleepycat/db/Database.html#join(com.sleepycat.db.Cursor[], com.sleepycat.db.JoinConfig)"><CODE>Database.join</CODE></A> are not closed
by this method, and should be closed by the caller.
<p>
<p>
<P>
<DD><DL>
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</A></CODE> - if a failure occurs.</DL>
</DD>
</DL>
<HR>
<A NAME="getDatabase()"><!-- --></A><H3>
getDatabase</H3>
<PRE>
public <A HREF="../../../com/sleepycat/db/Database.html" title="class in com.sleepycat.db">Database</A> <B>getDatabase</B>()</PRE>
<DL>
<DD>Returns the primary database handle associated with this cursor.
<p>
<P>
<DD><DL>
<DT><B>Returns:</B><DD>the primary database handle associated with this cursor.</DL>
</DD>
</DL>
<HR>
<A NAME="getConfig()"><!-- --></A><H3>
getConfig</H3>
<PRE>
public <A HREF="../../../com/sleepycat/db/JoinConfig.html" title="class in com.sleepycat.db">JoinConfig</A> <B>getConfig</B>()</PRE>
<DL>
<DD>Returns this object's configuration.
<p>
<P>
<DD><DL>
<DT><B>Returns:</B><DD>this object's configuration.</DL>
</DD>
</DL>
<HR>
<A NAME="getNext(com.sleepycat.db.DatabaseEntry, com.sleepycat.db.LockMode)"><!-- --></A><H3>
getNext</H3>
<PRE>
public <A HREF="../../../com/sleepycat/db/OperationStatus.html" title="class in com.sleepycat.db">OperationStatus</A> <B>getNext</B>(<A HREF="../../../com/sleepycat/db/DatabaseEntry.html" title="class in com.sleepycat.db">DatabaseEntry</A> key,
<A HREF="../../../com/sleepycat/db/LockMode.html" title="class in com.sleepycat.db">LockMode</A> lockMode)
throws <A HREF="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</A></PRE>
<DL>
<DD>Returns the next primary key resulting from the join operation.
<p>
An entry is returned by the join cursor for each primary key/data pair having
all secondary key values that were specified using the array of secondary
cursors passed to <A HREF="../../../com/sleepycat/db/Database.html#join(com.sleepycat.db.Cursor[], com.sleepycat.db.JoinConfig)"><CODE>Database.join</CODE></A>.
<p>
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>key</CODE> - the primary key
returned as output. Its byte array does not need to be initialized by the
caller.
<p><DD><CODE>lockMode</CODE> - the locking attributes; if null, default attributes are used.
<p>
<DT><B>Returns:</B><DD><A HREF="../../../com/sleepycat/db/OperationStatus.html#NOTFOUND"><CODE>OperationStatus.NOTFOUND</CODE></A> if no matching key/data pair is
found; <A HREF="../../../com/sleepycat/db/OperationStatus.html#KEYEMPTY"><CODE>OperationStatus.KEYEMPTY</CODE></A> if the database is a Queue or Recno database and the specified key exists, but was never explicitly created by the application or was later deleted; otherwise, <A HREF="../../../com/sleepycat/db/OperationStatus.html#SUCCESS"><CODE>OperationStatus.SUCCESS</CODE></A>.
<p>
<DT><B>Throws:</B>
<DD><CODE>java.lang.NullPointerException</CODE> - if a DatabaseEntry parameter is null or
does not contain a required non-null byte array.
<p>
<DD><CODE><A HREF="../../../com/sleepycat/db/DeadlockException.html" title="class in com.sleepycat.db">DeadlockException</A></CODE> - if the operation was selected to resolve a
deadlock.
<p>
<DD><CODE>java.lang.IllegalArgumentException</CODE> - if an invalid parameter was specified.
<p>
<DD><CODE><A HREF="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</A></CODE> - if a failure occurs.</DL>
</DD>
</DL>
<HR>
<A NAME="getNext(com.sleepycat.db.DatabaseEntry, com.sleepycat.db.DatabaseEntry, com.sleepycat.db.LockMode)"><!-- --></A><H3>
getNext</H3>
<PRE>
public <A HREF="../../../com/sleepycat/db/OperationStatus.html" title="class in com.sleepycat.db">OperationStatus</A> <B>getNext</B>(<A HREF="../../../com/sleepycat/db/DatabaseEntry.html" title="class in com.sleepycat.db">DatabaseEntry</A> key,
<A HREF="../../../com/sleepycat/db/DatabaseEntry.html" title="class in com.sleepycat.db">DatabaseEntry</A> data,
<A HREF="../../../com/sleepycat/db/LockMode.html" title="class in com.sleepycat.db">LockMode</A> lockMode)
throws <A HREF="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</A></PRE>
<DL>
<DD>Returns the next primary key and data resulting from the join operation.
<p>
An entry is returned by the join cursor for each primary key/data pair having
all secondary key values that were specified using the array of secondary
cursors passed to <A HREF="../../../com/sleepycat/db/Database.html#join(com.sleepycat.db.Cursor[], com.sleepycat.db.JoinConfig)"><CODE>Database.join</CODE></A>.
<p>
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>key</CODE> - the primary key
returned as output. Its byte array does not need to be initialized by the
caller.
<p><DD><CODE>data</CODE> - the primary data
returned as output. Its byte array does not need to be initialized by the
caller.
<p><DD><CODE>lockMode</CODE> - the locking attributes; if null, default attributes are used.
<p>
<DT><B>Returns:</B><DD><A HREF="../../../com/sleepycat/db/OperationStatus.html#NOTFOUND"><CODE>OperationStatus.NOTFOUND</CODE></A> if no matching key/data pair is
found; <A HREF="../../../com/sleepycat/db/OperationStatus.html#KEYEMPTY"><CODE>OperationStatus.KEYEMPTY</CODE></A> if the database is a Queue or Recno database and the specified key exists, but was never explicitly created by the application or was later deleted; otherwise, <A HREF="../../../com/sleepycat/db/OperationStatus.html#SUCCESS"><CODE>OperationStatus.SUCCESS</CODE></A>.
<p>
<DT><B>Throws:</B>
<DD><CODE>java.lang.NullPointerException</CODE> - if a DatabaseEntry parameter is null or
does not contain a required non-null byte array.
<p>
<DD><CODE><A HREF="../../../com/sleepycat/db/DeadlockException.html" title="class in com.sleepycat.db">DeadlockException</A></CODE> - if the operation was selected to resolve a
deadlock.
<p>
<DD><CODE>java.lang.IllegalArgumentException</CODE> - if an invalid parameter was specified.
<p>
<DD><CODE><A HREF="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</A></CODE> - if a failure occurs.</DL>
</DD>
</DL>
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