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EntityJoin (Oracle - Berkeley DB Java API)
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com.sleepycat.persist</FONT>
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Class EntityJoin<PK,E></H2>
<PRE>
<A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</A>
<IMG SRC="../../../resources/inherit.gif" ALT="extended by "><B>com.sleepycat.persist.EntityJoin<PK,E></B>
</PRE>
<HR>
<DL>
<DT><PRE>public class <B>EntityJoin<PK,E></B><DT>extends <A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A></DL>
</PRE>
<P>
Performs an equality join on two or more secondary keys.
<p><code>EntityJoin</code> objects are thread-safe. Multiple threads may safely
call the methods of a shared <code>EntityJoin</code> object.</p>
<p>An equality join is a match on all entities in a given primary index that
have two or more specific secondary key values. Note that key ranges may
not be matched by an equality join, only exact keys are matched.</p>
<p>For example:</p>
<pre class="code">
// Index declarations -- see <a href="package-summary.html#example">package summary example</a>.
//
PrimaryIndex<String, Person> personBySsn;
SecondaryIndex<String, String, Person> personByParentSsn;
SecondaryIndex<Long, String, Person> personByEmployerIds;
Employer employer = ...;
// Match on all Person objects having parentSsn "111-11-1111" and also
// containing an employerId of employer.id. In other words, match on all
// of Bob's children that work for a given employer.
//
EntityJoin<String, Person> join = new EntityJoin(personBySsn);
join.addCondition(personByParentSsn, "111-11-1111");
join.addCondition(personByEmployerIds, employer.id);
// Perform the join operation by traversing the results with a cursor.
//
ForwardCursor<Person> results = join.entities();
try {
for (Person person : results) {
System.out.println(person.ssn + ' ' + person.name);
}
} finally {
results.close();
}</pre>
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<!-- ======== CONSTRUCTOR SUMMARY ======== -->
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<TD><CODE><B><A HREF="../../../com/sleepycat/persist/EntityJoin.html#EntityJoin(com.sleepycat.persist.PrimaryIndex)">EntityJoin</A></B>(<A HREF="../../../com/sleepycat/persist/PrimaryIndex.html" title="class in com.sleepycat.persist">PrimaryIndex</A><<A HREF="../../../com/sleepycat/persist/EntityJoin.html" title="type parameter in EntityJoin">PK</A>,<A HREF="../../../com/sleepycat/persist/EntityJoin.html" title="type parameter in EntityJoin">E</A>> index)</CODE>
<BR>
Creates a join object for a given primary index.</TD>
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<CODE>
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<CODE><SK> void</CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../../com/sleepycat/persist/EntityJoin.html#addCondition(com.sleepycat.persist.SecondaryIndex, SK)">addCondition</A></B>(<A HREF="../../../com/sleepycat/persist/SecondaryIndex.html" title="class in com.sleepycat.persist">SecondaryIndex</A><SK,<A HREF="../../../com/sleepycat/persist/EntityJoin.html" title="type parameter in EntityJoin">PK</A>,<A HREF="../../../com/sleepycat/persist/EntityJoin.html" title="type parameter in EntityJoin">E</A>> index,
SK key)</CODE>
<BR>
Adds a secondary key condition to the equality join.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../com/sleepycat/persist/ForwardCursor.html" title="interface in com.sleepycat.persist">ForwardCursor</A><<A HREF="../../../com/sleepycat/persist/EntityJoin.html" title="type parameter in EntityJoin">E</A>></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/persist/EntityJoin.html#entities()">entities</A></B>()</CODE>
<BR>
Opens a cursor that returns the entities qualifying for the join.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../com/sleepycat/persist/ForwardCursor.html" title="interface in com.sleepycat.persist">ForwardCursor</A><<A HREF="../../../com/sleepycat/persist/EntityJoin.html" title="type parameter in EntityJoin">E</A>></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/persist/EntityJoin.html#entities(com.sleepycat.db.Transaction, com.sleepycat.db.CursorConfig)">entities</A></B>(<A HREF="../../../com/sleepycat/db/Transaction.html" title="class in com.sleepycat.db">Transaction</A> txn,
<A HREF="../../../com/sleepycat/db/CursorConfig.html" title="class in com.sleepycat.db">CursorConfig</A> config)</CODE>
<BR>
Opens a cursor that returns the entities qualifying for the join.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../com/sleepycat/persist/ForwardCursor.html" title="interface in com.sleepycat.persist">ForwardCursor</A><<A HREF="../../../com/sleepycat/persist/EntityJoin.html" title="type parameter in EntityJoin">PK</A>></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/persist/EntityJoin.html#keys()">keys</A></B>()</CODE>
<BR>
Opens a cursor that returns the primary keys of entities qualifying for
the join.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../com/sleepycat/persist/ForwardCursor.html" title="interface in com.sleepycat.persist">ForwardCursor</A><<A HREF="../../../com/sleepycat/persist/EntityJoin.html" title="type parameter in EntityJoin">PK</A>></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/persist/EntityJoin.html#keys(com.sleepycat.db.Transaction, com.sleepycat.db.CursorConfig)">keys</A></B>(<A HREF="../../../com/sleepycat/db/Transaction.html" title="class in com.sleepycat.db">Transaction</A> txn,
<A HREF="../../../com/sleepycat/db/CursorConfig.html" title="class in com.sleepycat.db">CursorConfig</A> config)</CODE>
<BR>
Opens a cursor that returns the primary keys of entities qualifying for
the join.</TD>
</TR>
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<B>Constructor Detail</B></FONT></TH>
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<A NAME="EntityJoin(com.sleepycat.persist.PrimaryIndex)"><!-- --></A><H3>
EntityJoin</H3>
<PRE>
public <B>EntityJoin</B>(<A HREF="../../../com/sleepycat/persist/PrimaryIndex.html" title="class in com.sleepycat.persist">PrimaryIndex</A><<A HREF="../../../com/sleepycat/persist/EntityJoin.html" title="type parameter in EntityJoin">PK</A>,<A HREF="../../../com/sleepycat/persist/EntityJoin.html" title="type parameter in EntityJoin">E</A>> index)</PRE>
<DL>
<DD>Creates a join object for a given primary index.
<P>
<DL>
<DT><B>Parameters:</B><DD><CODE>index</CODE> - the primary index on which the join will operate.</DL>
</DL>
<!-- ============ METHOD DETAIL ========== -->
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<B>Method Detail</B></FONT></TH>
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</TABLE>
<A NAME="addCondition(com.sleepycat.persist.SecondaryIndex,java.lang.Object)"><!-- --></A><A NAME="addCondition(com.sleepycat.persist.SecondaryIndex, SK)"><!-- --></A><H3>
addCondition</H3>
<PRE>
public <SK> void <B>addCondition</B>(<A HREF="../../../com/sleepycat/persist/SecondaryIndex.html" title="class in com.sleepycat.persist">SecondaryIndex</A><SK,<A HREF="../../../com/sleepycat/persist/EntityJoin.html" title="type parameter in EntityJoin">PK</A>,<A HREF="../../../com/sleepycat/persist/EntityJoin.html" title="type parameter in EntityJoin">E</A>> index,
SK key)</PRE>
<DL>
<DD>Adds a secondary key condition to the equality join. Only entities
having the given key value in the given secondary index will be returned
by the join operation.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>index</CODE> - the secondary index containing the given key value.<DD><CODE>key</CODE> - the key value to match during the join.</DL>
</DD>
</DL>
<HR>
<A NAME="entities()"><!-- --></A><H3>
entities</H3>
<PRE>
public <A HREF="../../../com/sleepycat/persist/ForwardCursor.html" title="interface in com.sleepycat.persist">ForwardCursor</A><<A HREF="../../../com/sleepycat/persist/EntityJoin.html" title="type parameter in EntityJoin">E</A>> <B>entities</B>()
throws <A HREF="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</A></PRE>
<DL>
<DD>Opens a cursor that returns the entities qualifying for the join. The
join operation is performed as the returned cursor is accessed.
<p>The operations performed with the cursor will not be transaction
protected, and <A HREF="../../../com/sleepycat/db/CursorConfig.html#DEFAULT"><CODE>CursorConfig.DEFAULT</CODE></A> is used implicitly.</p>
<P>
<DD><DL>
<DT><B>Returns:</B><DD>the cursor.
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/IllegalStateException.html?is-external=true" title="class or interface in java.lang">IllegalStateException</A></CODE> - if less than two conditions were added.
<DD><CODE><A HREF="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</A></CODE> - the base class for all BDB exceptions.</DL>
</DD>
</DL>
<HR>
<A NAME="entities(com.sleepycat.db.Transaction, com.sleepycat.db.CursorConfig)"><!-- --></A><H3>
entities</H3>
<PRE>
public <A HREF="../../../com/sleepycat/persist/ForwardCursor.html" title="interface in com.sleepycat.persist">ForwardCursor</A><<A HREF="../../../com/sleepycat/persist/EntityJoin.html" title="type parameter in EntityJoin">E</A>> <B>entities</B>(<A HREF="../../../com/sleepycat/db/Transaction.html" title="class in com.sleepycat.db">Transaction</A> txn,
<A HREF="../../../com/sleepycat/db/CursorConfig.html" title="class in com.sleepycat.db">CursorConfig</A> config)
throws <A HREF="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</A></PRE>
<DL>
<DD>Opens a cursor that returns the entities qualifying for the join. The
join operation is performed as the returned cursor is accessed.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>txn</CODE> - the transaction used to protect all operations performed with
the cursor, or null if the operations should not be transaction
protected. If the store is non-transactional, null must be specified.
For a transactional store the transaction is optional for read-only
access and required for read-write access.<DD><CODE>config</CODE> - the cursor configuration that determines the default lock
mode used for all cursor operations, or null to implicitly use <A HREF="../../../com/sleepycat/db/CursorConfig.html#DEFAULT"><CODE>CursorConfig.DEFAULT</CODE></A>.
<DT><B>Returns:</B><DD>the cursor.
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/IllegalStateException.html?is-external=true" title="class or interface in java.lang">IllegalStateException</A></CODE> - if less than two conditions were added.
<DD><CODE><A HREF="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</A></CODE> - the base class for all BDB exceptions.</DL>
</DD>
</DL>
<HR>
<A NAME="keys()"><!-- --></A><H3>
keys</H3>
<PRE>
public <A HREF="../../../com/sleepycat/persist/ForwardCursor.html" title="interface in com.sleepycat.persist">ForwardCursor</A><<A HREF="../../../com/sleepycat/persist/EntityJoin.html" title="type parameter in EntityJoin">PK</A>> <B>keys</B>()
throws <A HREF="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</A></PRE>
<DL>
<DD>Opens a cursor that returns the primary keys of entities qualifying for
the join. The join operation is performed as the returned cursor is
accessed.
<p>The operations performed with the cursor will not be transaction
protected, and <A HREF="../../../com/sleepycat/db/CursorConfig.html#DEFAULT"><CODE>CursorConfig.DEFAULT</CODE></A> is used implicitly.</p>
<P>
<DD><DL>
<DT><B>Returns:</B><DD>the cursor.
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/IllegalStateException.html?is-external=true" title="class or interface in java.lang">IllegalStateException</A></CODE> - if less than two conditions were added.
<DD><CODE><A HREF="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</A></CODE> - the base class for all BDB exceptions.</DL>
</DD>
</DL>
<HR>
<A NAME="keys(com.sleepycat.db.Transaction, com.sleepycat.db.CursorConfig)"><!-- --></A><H3>
keys</H3>
<PRE>
public <A HREF="../../../com/sleepycat/persist/ForwardCursor.html" title="interface in com.sleepycat.persist">ForwardCursor</A><<A HREF="../../../com/sleepycat/persist/EntityJoin.html" title="type parameter in EntityJoin">PK</A>> <B>keys</B>(<A HREF="../../../com/sleepycat/db/Transaction.html" title="class in com.sleepycat.db">Transaction</A> txn,
<A HREF="../../../com/sleepycat/db/CursorConfig.html" title="class in com.sleepycat.db">CursorConfig</A> config)
throws <A HREF="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</A></PRE>
<DL>
<DD>Opens a cursor that returns the primary keys of entities qualifying for
the join. The join operation is performed as the returned cursor is
accessed.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>txn</CODE> - the transaction used to protect all operations performed with
the cursor, or null if the operations should not be transaction
protected. If the store is non-transactional, null must be specified.
For a transactional store the transaction is optional for read-only
access and required for read-write access.<DD><CODE>config</CODE> - the cursor configuration that determines the default lock
mode used for all cursor operations, or null to implicitly use <A HREF="../../../com/sleepycat/db/CursorConfig.html#DEFAULT"><CODE>CursorConfig.DEFAULT</CODE></A>.
<DT><B>Returns:</B><DD>the cursor.
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/IllegalStateException.html?is-external=true" title="class or interface in java.lang">IllegalStateException</A></CODE> - if less than two conditions were added.
<DD><CODE><A HREF="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</A></CODE> - the base class for all BDB exceptions.</DL>
</DD>
</DL>
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