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<!--Id: xml_xpath.so,v 10.5 2002/06/24 14:49:38 bostic Exp -->
<!--Copyright 1997-2002 by Sleepycat Software, Inc.-->
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<title>Berkeley DB: XmlContainer.queryWithXPath</title>
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<h1>XmlContainer.queryWithXPath</h1>
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<h3><pre>
import com.sleepycat.dbxml.*;
<p>
public XmlResults queryWithXPath(DbTxn txnid,
XPathExpression expression, int flags)
throws XmlException;
<p>
public XmlResults queryWithXPath(DbTxn txnid,
String query, XmlQueryContext context, int flags)
throws XmlException;
</pre></h3>
<h1>Description</h1>
<p>Return the results of an XPath 1.0 version query against the container.
In the first variant, <b>expression</b> is provided as the results of
a call to the <a href="../api_java/xml_xparse.html">XmlContainer.parseXPathExpression</a> method.
<p>In the second variant, <b>query</b> is provided as a string (expected
to be in the syntax defined in the
<a href="http://www.w3c.org/TR/xpath">W3C XPath 1.0 specification</a>).
In this case, the query may optionally be done within the execution
context <b>context</b>, which describes how the query is to be
performed. If no context is specified, the query will retrieve the set
of <a href="../api_java/xmldocument_class.html">XmlDocument</a>s matching the XPath expression.
<p>If the operation is to be transaction-protected, the <b>txnid</b>
parameter is a transaction handle returned from <a href="../api_java/txn_begin.html">DbEnv.txn_begin</a>;
otherwise, null.
<p>The <b>flags</b> value must be set to 0 or by bitwise inclusively <b>OR</b>'ing together one or
more of the following values:
<p><dl compact>
<p><dt><a name="Db.DB_DIRTY_READ">Db.DB_DIRTY_READ</a><dd>Read modified but not yet committed data. Silently ignored if the
<a href="../api_java/db_open.html#DB_DIRTY_READ">Db.DB_DIRTY_READ</a> flag was not specified when the underlying
<a href="../api_java/xmlcontainer_class.html">XmlContainer</a> was opened.
<p><dt><a name="Db.DB_RMW">Db.DB_RMW</a><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>Because the <a href="../api_java/xml_get.html">XmlContainer.getDocument</a> interface will not hold locks
across Berkeley DB interface calls in non-transactional environments, the
<a href="../api_java/dbc_get.html#DB_RMW">Db.DB_RMW</a> flag to the <a href="../api_java/xml_get.html">XmlContainer.getDocument</a> call is meaningful only in
the presence of transactions.
</dl>
<p>The XmlContainer.queryWithXPath method throws an exception that encapsulates a non-zero error value on
failure.
<h1>Errors</h1>
<p>The XmlContainer.queryWithXPath method may fail and throw an exception encapsulating a non-zero error for the following conditions:
<p><dl compact>
<p><dt>EINVAL<dd>An invalid flag value or parameter was specified.
</dl>
<p>The XmlContainer.queryWithXPath method may fail and throw an exception for errors specified for other Berkeley DB and C library or system methods.
If a catastrophic error has occurred, the XmlContainer.queryWithXPath method may fail and
throw a <a href="../api_java/runrec_class.html">DbRunRecoveryException</a>,
in which case all subsequent Berkeley DB calls will fail in the same way.
<h1>Class</h1>
<a href="../api_java/xmlcontainer_class.html">XmlContainer</a>, <a href="../api_java/xmldocument_class.html">XmlDocument</a>, <a href="../api_java/xmlquery_class.html">XmlQueryContext</a>
<h1>See Also</h1>
<a href="../api_java/xml_close.html">XmlContainer.close</a>,
<a href="../api_java/xml_declare.html">XmlContainer.declareIndex</a>,
<a href="../api_java/xml_del.html">XmlContainer.deleteDocument</a>,
<a href="../api_java/xml_get.html">XmlContainer.getDocument</a>,
<a href="../api_java/xml_getname.html">XmlContainer.getName</a>,
<a href="../api_java/xml_open.html">XmlContainer.open</a>,
<a href="../api_java/xml_put.html">XmlContainer.putDocument</a>
and
<a href="../api_java/xml_xpath.html">XmlContainer.queryWithXPath</a>.
<p>
<a href="../api_java/xmldoc_getattr.html">XmlDocument.getAttributeValue</a>,
<a href="../api_java/xmldoc_getcont.html">XmlDocument.getContent</a>,
<a href="../api_java/xmldoc_getid.html">XmlDocument.getID</a>,
<a href="../api_java/xmldoc_getname.html">XmlDocument.getName</a>,
<a href="../api_java/xmldoc_gettype.html">XmlDocument.getType</a>,
<a href="../api_java/xmldoc_setcont.html">XmlDocument.setContent</a>,
<a href="../api_java/xmldoc_setname.html">XmlDocument.setName</a>,
and
<a href="../api_java/xmldoc_settype.html">XmlDocument.setType</a>.
</tt>
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