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LockMode
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com.sleepycat.db</FONT>
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Class LockMode</H2>
<PRE>
java.lang.Object
<IMG SRC="../../../resources/inherit.gif" ALT="extended by "><B>com.sleepycat.db.LockMode</B>
</PRE>
<HR>
<DL>
<DT><PRE>public final class <B>LockMode</B><DT>extends java.lang.Object</DL>
</PRE>
<P>
Locking modes for database operations. Locking modes are required
parameters for operations that retrieve data or modify the database.
<P>
<P>
<HR>
<P>
<!-- =========== FIELD SUMMARY =========== -->
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<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
<B>Field Summary</B></FONT></TH>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static <A HREF="../../../com/sleepycat/db/LockMode.html" title="class in com.sleepycat.db">LockMode</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/db/LockMode.html#DEFAULT">DEFAULT</A></B></CODE>
<BR>
Acquire read locks for read operations and write locks for write
operations.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static <A HREF="../../../com/sleepycat/db/LockMode.html" title="class in com.sleepycat.db">LockMode</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/db/LockMode.html#DEGREE_2">DEGREE_2</A></B></CODE>
<BR>
<B>Deprecated.</B> <I>This has been replaced by <A HREF="../../../com/sleepycat/db/LockMode.html#READ_COMMITTED"><CODE>READ_COMMITTED</CODE></A> to conform to ANSI
database isolation terminology.</I></TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static <A HREF="../../../com/sleepycat/db/LockMode.html" title="class in com.sleepycat.db">LockMode</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/db/LockMode.html#DIRTY_READ">DIRTY_READ</A></B></CODE>
<BR>
<B>Deprecated.</B> <I>This has been replaced by <A HREF="../../../com/sleepycat/db/LockMode.html#READ_UNCOMMITTED"><CODE>READ_UNCOMMITTED</CODE></A> to conform to ANSI
database isolation terminology.</I></TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static <A HREF="../../../com/sleepycat/db/LockMode.html" title="class in com.sleepycat.db">LockMode</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/db/LockMode.html#IGNORE_LEASES">IGNORE_LEASES</A></B></CODE>
<BR>
Return the data item irrespective of the state of master leases.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static <A HREF="../../../com/sleepycat/db/LockMode.html" title="class in com.sleepycat.db">LockMode</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/db/LockMode.html#READ_COMMITTED">READ_COMMITTED</A></B></CODE>
<BR>
Read committed isolation provides for cursor stability but not repeatable
reads.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static <A HREF="../../../com/sleepycat/db/LockMode.html" title="class in com.sleepycat.db">LockMode</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/db/LockMode.html#READ_UNCOMMITTED">READ_UNCOMMITTED</A></B></CODE>
<BR>
Read modified but not yet committed data.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static <A HREF="../../../com/sleepycat/db/LockMode.html" title="class in com.sleepycat.db">LockMode</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/db/LockMode.html#RMW">RMW</A></B></CODE>
<BR>
Acquire write locks instead of read locks when doing the retrieval.</TD>
</TR>
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<CODE> java.lang.String</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/db/LockMode.html#toString()">toString</A></B>()</CODE>
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<TH ALIGN="left"><B>Methods inherited from class java.lang.Object</B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE>clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait</CODE></TD>
</TR>
</TABLE>
<P>
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<A NAME="DEFAULT"><!-- --></A><H3>
DEFAULT</H3>
<PRE>
public static final <A HREF="../../../com/sleepycat/db/LockMode.html" title="class in com.sleepycat.db">LockMode</A> <B>DEFAULT</B></PRE>
<DL>
<DD>Acquire read locks for read operations and write locks for write
operations.
<P>
<DL>
</DL>
</DL>
<HR>
<A NAME="READ_UNCOMMITTED"><!-- --></A><H3>
READ_UNCOMMITTED</H3>
<PRE>
public static final <A HREF="../../../com/sleepycat/db/LockMode.html" title="class in com.sleepycat.db">LockMode</A> <B>READ_UNCOMMITTED</B></PRE>
<DL>
<DD>Read modified but not yet committed data.
<P>
<DL>
</DL>
</DL>
<HR>
<A NAME="READ_COMMITTED"><!-- --></A><H3>
READ_COMMITTED</H3>
<PRE>
public static final <A HREF="../../../com/sleepycat/db/LockMode.html" title="class in com.sleepycat.db">LockMode</A> <B>READ_COMMITTED</B></PRE>
<DL>
<DD>Read committed isolation provides for cursor stability but not repeatable
reads. Data items which have been previously read by this transaction may
be deleted or modified by other transactions before the cursor is closed or
the transaction completes.
<p>
Note that this LockMode may only be passed to <A HREF="../../../com/sleepycat/db/Database.html" title="class in com.sleepycat.db"><CODE>Database</CODE></A> get
methods, not to <A HREF="../../../com/sleepycat/db/Cursor.html" title="class in com.sleepycat.db"><CODE>Cursor</CODE></A> methods. To configure a cursor for
Read committed isolation, use <A HREF="../../../com/sleepycat/db/CursorConfig.html#setReadCommitted(boolean)"><CODE>CursorConfig.setReadCommitted(boolean)</CODE></A>.
<P>
<DL>
</DL>
</DL>
<HR>
<A NAME="RMW"><!-- --></A><H3>
RMW</H3>
<PRE>
public static final <A HREF="../../../com/sleepycat/db/LockMode.html" title="class in com.sleepycat.db">LockMode</A> <B>RMW</B></PRE>
<DL>
<DD>Acquire write locks instead of read locks when doing the retrieval.
Setting this flag can eliminate deadlock during a read-modify-write
cycle by acquiring the write lock during the read part of the cycle
so that another thread of control acquiring a read lock for the same
item, in its own read-modify-write cycle, will not result in deadlock.
<P>
<DL>
</DL>
</DL>
<HR>
<A NAME="DIRTY_READ"><!-- --></A><H3>
DIRTY_READ</H3>
<PRE>
public static final <A HREF="../../../com/sleepycat/db/LockMode.html" title="class in com.sleepycat.db">LockMode</A> <B>DIRTY_READ</B></PRE>
<DL>
<DD><B>Deprecated.</B> <I>This has been replaced by <A HREF="../../../com/sleepycat/db/LockMode.html#READ_UNCOMMITTED"><CODE>READ_UNCOMMITTED</CODE></A> to conform to ANSI
database isolation terminology.</I><DD>Read modified but not yet committed data.
<p>
<P>
<DL>
</DL>
</DL>
<HR>
<A NAME="DEGREE_2"><!-- --></A><H3>
DEGREE_2</H3>
<PRE>
public static final <A HREF="../../../com/sleepycat/db/LockMode.html" title="class in com.sleepycat.db">LockMode</A> <B>DEGREE_2</B></PRE>
<DL>
<DD><B>Deprecated.</B> <I>This has been replaced by <A HREF="../../../com/sleepycat/db/LockMode.html#READ_COMMITTED"><CODE>READ_COMMITTED</CODE></A> to conform to ANSI
database isolation terminology.</I><DD>Read committed isolation provides for cursor stability but not repeatable
reads. Data items which have been previously read by this transaction may
be deleted or modified by other transactions before the cursor is closed or
the transaction completes.
<p>
Note that this LockMode may only be passed to <A HREF="../../../com/sleepycat/db/Database.html" title="class in com.sleepycat.db"><CODE>Database</CODE></A> get
methods, not to <A HREF="../../../com/sleepycat/db/Cursor.html" title="class in com.sleepycat.db"><CODE>Cursor</CODE></A> methods. To configure a cursor for
Read committed isolation, use <A HREF="../../../com/sleepycat/db/CursorConfig.html#setReadCommitted(boolean)"><CODE>CursorConfig.setReadCommitted(boolean)</CODE></A>.
<p>
<P>
<DL>
</DL>
</DL>
<HR>
<A NAME="IGNORE_LEASES"><!-- --></A><H3>
IGNORE_LEASES</H3>
<PRE>
public static final <A HREF="../../../com/sleepycat/db/LockMode.html" title="class in com.sleepycat.db">LockMode</A> <B>IGNORE_LEASES</B></PRE>
<DL>
<DD>Return the data item irrespective of the state of master leases. The item
will be returned under all conditions: if master leases are not configured,
if the request is made to a client, if the request is made to a master with
a valid lease, or if the request is made to a master without a valid lease.
<P>
<DL>
</DL>
</DL>
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<A NAME="toString()"><!-- --></A><H3>
toString</H3>
<PRE>
public java.lang.String <B>toString</B>()</PRE>
<DL>
<DD>
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE>toString</CODE> in class <CODE>java.lang.Object</CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
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