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7JoinCursor (Oracle - Berkeley DB Java API)
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88com.sleepycat.db</FONT>
89<BR>
90Class JoinCursor</H2>
91<PRE>
92<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>
93  <IMG SRC="/resources/inherit.gif" ALT="extended by "><B>com.sleepycat.db.JoinCursor</B>
94</PRE>
95<HR>
96<DL>
97<DT><PRE>public class <B>JoinCursor</B><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>
98</PRE>
99
100<P>
101A specialized join cursor for use in performing equality or natural joins on
102secondary indices.
103<p>
104A 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>.
105<p>
106To open a join cursor using two secondary cursors:
107<pre>
108    Transaction txn = ...
109    Database primaryDb = ...
110    SecondaryDatabase secondaryDb1 = ...
111    SecondaryDatabase secondaryDb2 = ...
112    <p>
113    SecondaryCursor cursor1 = null;
114    SecondaryCursor cursor2 = null;
115    JoinCursor joinCursor = null;
116    try {
117        DatabaseEntry key = new DatabaseEntry();
118        DatabaseEntry data = new DatabaseEntry();
119        <p>
120        cursor1 = secondaryDb1.openSecondaryCursor(txn, null);
121        cursor2 = secondaryDb2.openSecondaryCursor(txn, null);
122        <p>
123        key.setData(...); // initialize key for secondary index 1
124        OperationStatus status1 =
125        cursor1.getSearchKey(key, data, LockMode.DEFAULT);
126        key.setData(...); // initialize key for secondary index 2
127        OperationStatus status2 =
128        cursor2.getSearchKey(key, data, LockMode.DEFAULT);
129        <p>
130        if (status1 == OperationStatus.SUCCESS &amp;&amp;
131                status2 == OperationStatus.SUCCESS) {
132            <p>
133            SecondaryCursor[] cursors = {cursor1, cursor2};
134            joinCursor = primaryDb.join(cursors, null);
135            <p>
136            while (true) {
137                OperationStatus joinStatus = joinCursor.getNext(key, data,
138                    LockMode.DEFAULT);
139                if (joinStatus == OperationStatus.SUCCESS) {
140                     // Do something with the key and data.
141                } else {
142                    break;
143                }
144            }
145        }
146    } finally {
147        if (cursor1 != null) {
148            cursor1.close();
149        }
150        if (cursor2 != null) {
151            cursor2.close();
152        }
153        if (joinCursor != null) {
154            joinCursor.close();
155        }
156    }
157</pre>
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159
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174<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
175<CODE>&nbsp;void</CODE></FONT></TD>
176<TD><CODE><B><A HREF="/com/sleepycat/db/JoinCursor.html#close()">close</A></B>()</CODE>
177
178<BR>
179&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Closes the cursors that have been opened by this join cursor.</TD>
180</TR>
181<TR BGCOLOR="white" CLASS="TableRowColor">
182<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
183<CODE>&nbsp;<A HREF="/com/sleepycat/db/JoinConfig.html" title="class in com.sleepycat.db">JoinConfig</A></CODE></FONT></TD>
184<TD><CODE><B><A HREF="/com/sleepycat/db/JoinCursor.html#getConfig()">getConfig</A></B>()</CODE>
185
186<BR>
187&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns this object's configuration.</TD>
188</TR>
189<TR BGCOLOR="white" CLASS="TableRowColor">
190<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
191<CODE>&nbsp;<A HREF="/com/sleepycat/db/Database.html" title="class in com.sleepycat.db">Database</A></CODE></FONT></TD>
192<TD><CODE><B><A HREF="/com/sleepycat/db/JoinCursor.html#getDatabase()">getDatabase</A></B>()</CODE>
193
194<BR>
195&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the primary database handle associated with this cursor.</TD>
196</TR>
197<TR BGCOLOR="white" CLASS="TableRowColor">
198<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
199<CODE>&nbsp;<A HREF="/com/sleepycat/db/OperationStatus.html" title="class in com.sleepycat.db">OperationStatus</A></CODE></FONT></TD>
200<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>&nbsp;key,
201        <A HREF="/com/sleepycat/db/DatabaseEntry.html" title="class in com.sleepycat.db">DatabaseEntry</A>&nbsp;data,
202        <A HREF="/com/sleepycat/db/LockMode.html" title="class in com.sleepycat.db">LockMode</A>&nbsp;lockMode)</CODE>
203
204<BR>
205&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the next primary key and data resulting from the join operation.</TD>
206</TR>
207<TR BGCOLOR="white" CLASS="TableRowColor">
208<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
209<CODE>&nbsp;<A HREF="/com/sleepycat/db/OperationStatus.html" title="class in com.sleepycat.db">OperationStatus</A></CODE></FONT></TD>
210<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>&nbsp;key,
211        <A HREF="/com/sleepycat/db/LockMode.html" title="class in com.sleepycat.db">LockMode</A>&nbsp;lockMode)</CODE>
212
213<BR>
214&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the next primary key resulting from the join operation.</TD>
215</TR>
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238
239<A NAME="close()"><!-- --></A><H3>
240close</H3>
241<PRE>
242public void <B>close</B>()
243           throws <A HREF="/com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</A></PRE>
244<DL>
245<DD>Closes the cursors that have been opened by this join cursor.
246    <p>
247    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
248    by this method, and should be closed by the caller.
249    <p>
250    <p>
251<P>
252<DD><DL>
253
254<DT><B>Throws:</B>
255<DD><CODE><A HREF="/com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</A></CODE> - if a failure occurs.</DL>
256</DD>
257</DL>
258<HR>
259
260<A NAME="getDatabase()"><!-- --></A><H3>
261getDatabase</H3>
262<PRE>
263public <A HREF="/com/sleepycat/db/Database.html" title="class in com.sleepycat.db">Database</A> <B>getDatabase</B>()</PRE>
264<DL>
265<DD>Returns the primary database handle associated with this cursor.
266    <p>
267<P>
268<DD><DL>
269
270<DT><B>Returns:</B><DD>the primary database handle associated with this cursor.</DL>
271</DD>
272</DL>
273<HR>
274
275<A NAME="getConfig()"><!-- --></A><H3>
276getConfig</H3>
277<PRE>
278public <A HREF="/com/sleepycat/db/JoinConfig.html" title="class in com.sleepycat.db">JoinConfig</A> <B>getConfig</B>()</PRE>
279<DL>
280<DD>Returns this object's configuration.
281    <p>
282<P>
283<DD><DL>
284
285<DT><B>Returns:</B><DD>this object's configuration.</DL>
286</DD>
287</DL>
288<HR>
289
290<A NAME="getNext(com.sleepycat.db.DatabaseEntry, com.sleepycat.db.LockMode)"><!-- --></A><H3>
291getNext</H3>
292<PRE>
293public <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>&nbsp;key,
294                               <A HREF="/com/sleepycat/db/LockMode.html" title="class in com.sleepycat.db">LockMode</A>&nbsp;lockMode)
295                        throws <A HREF="/com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</A></PRE>
296<DL>
297<DD>Returns the next primary key resulting from the join operation.
298<p>
299An entry is returned by the join cursor for each primary key/data pair having
300all secondary key values that were specified using the array of secondary
301cursors passed to <A HREF="/com/sleepycat/db/Database.html#join(com.sleepycat.db.Cursor[], com.sleepycat.db.JoinConfig)"><CODE>Database.join</CODE></A>.
302<p>
303<P>
304<DD><DL>
305<DT><B>Parameters:</B><DD><CODE>key</CODE> - the primary key
306returned as output.  Its byte array does not need to be initialized by the
307caller.
308<p><DD><CODE>lockMode</CODE> - the locking attributes; if null, default attributes are used.
309<p>
310<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
311found; <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>.
312<p>
313<DT><B>Throws:</B>
314<DD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/NullPointerException.html" title="class or interface in java.lang">NullPointerException</A></CODE> - if a DatabaseEntry parameter is null or
315does not contain a required non-null byte array.
316<p>
317<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
318deadlock.
319<p>
320<DD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/IllegalArgumentException.html" title="class or interface in java.lang">IllegalArgumentException</A></CODE> - if an invalid parameter was specified.
321<p>
322<DD><CODE><A HREF="/com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</A></CODE> - if a failure occurs.</DL>
323</DD>
324</DL>
325<HR>
326
327<A NAME="getNext(com.sleepycat.db.DatabaseEntry, com.sleepycat.db.DatabaseEntry, com.sleepycat.db.LockMode)"><!-- --></A><H3>
328getNext</H3>
329<PRE>
330public <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>&nbsp;key,
331                               <A HREF="/com/sleepycat/db/DatabaseEntry.html" title="class in com.sleepycat.db">DatabaseEntry</A>&nbsp;data,
332                               <A HREF="/com/sleepycat/db/LockMode.html" title="class in com.sleepycat.db">LockMode</A>&nbsp;lockMode)
333                        throws <A HREF="/com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</A></PRE>
334<DL>
335<DD>Returns the next primary key and data resulting from the join operation.
336<p>
337An entry is returned by the join cursor for each primary key/data pair having
338all secondary key values that were specified using the array of secondary
339cursors passed to <A HREF="/com/sleepycat/db/Database.html#join(com.sleepycat.db.Cursor[], com.sleepycat.db.JoinConfig)"><CODE>Database.join</CODE></A>.
340<p>
341<P>
342<DD><DL>
343<DT><B>Parameters:</B><DD><CODE>key</CODE> - the primary key
344returned as output.  Its byte array does not need to be initialized by the
345caller.
346<p><DD><CODE>data</CODE> - the primary data
347returned as output.  Its byte array does not need to be initialized by the
348caller.
349<p><DD><CODE>lockMode</CODE> - the locking attributes; if null, default attributes are used.
350<p>
351<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
352found; <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>.
353<p>
354<DT><B>Throws:</B>
355<DD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/NullPointerException.html" title="class or interface in java.lang">NullPointerException</A></CODE> - if a DatabaseEntry parameter is null or
356does not contain a required non-null byte array.
357<p>
358<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
359deadlock.
360<p>
361<DD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/IllegalArgumentException.html" title="class or interface in java.lang">IllegalArgumentException</A></CODE> - if an invalid parameter was specified.
362<p>
363<DD><CODE><A HREF="/com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</A></CODE> - if a failure occurs.</DL>
364</DD>
365</DL>
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