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/*
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* Copyright (c) 2005, 2006, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package java.sql;
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import java.io.InputStream;
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import java.io.OutputStream;
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import java.io.Reader;
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import java.io.Writer;
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import javax.xml.transform.Result;
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import javax.xml.transform.Source;
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/**
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* The mapping in the JavaTM programming language for the SQL XML type.
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* XML is a built-in type that stores an XML value
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* as a column value in a row of a database table.
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* By default drivers implement an SQLXML object as
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* a logical pointer to the XML data
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* rather than the data itself.
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* An SQLXML object is valid for the duration of the transaction in which it was created.
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* <p>
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* The SQLXML interface provides methods for accessing the XML value
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* as a String, a Reader or Writer, or as a Stream. The XML value
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* may also be accessed through a Source or set as a Result, which
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* are used with XML Parser APIs such as DOM, SAX, and StAX, as
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* well as with XSLT transforms and XPath evaluations.
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* <p>
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* Methods in the interfaces ResultSet, CallableStatement, and PreparedStatement,
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* such as getSQLXML allow a programmer to access an XML value.
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* In addition, this interface has methods for updating an XML value.
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* <p>
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* The XML value of the SQLXML instance may be obtained as a BinaryStream using
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* <pre>
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* SQLXML sqlxml = resultSet.getSQLXML(column);
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* InputStream binaryStream = sqlxml.getBinaryStream();
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* </pre>
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* For example, to parse an XML value with a DOM parser:
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* <pre>
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* DocumentBuilder parser = DocumentBuilderFactory.newInstance().newDocumentBuilder();
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* Document result = parser.parse(binaryStream);
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* </pre>
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* or to parse an XML value with a SAX parser to your handler:
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* <pre>
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* SAXParser parser = SAXParserFactory.newInstance().newSAXParser();
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* parser.parse(binaryStream, myHandler);
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* </pre>
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* or to parse an XML value with a StAX parser:
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* <pre>
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* XMLInputFactory factory = XMLInputFactory.newInstance();
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* XMLStreamReader streamReader = factory.createXMLStreamReader(binaryStream);
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* </pre>
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* <p>
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* Because databases may use an optimized representation for the XML,
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* accessing the value through getSource() and
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* setResult() can lead to improved processing performance
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* without serializing to a stream representation and parsing the XML.
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* <p>
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* For example, to obtain a DOM Document Node:
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* <pre>
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* DOMSource domSource = sqlxml.getSource(DOMSource.class);
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* Document document = (Document) domSource.getNode();
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* </pre>
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* or to set the value to a DOM Document Node to myNode:
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* <pre>
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* DOMResult domResult = sqlxml.setResult(DOMResult.class);
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* domResult.setNode(myNode);
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* </pre>
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* or, to send SAX events to your handler:
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* <pre>
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* SAXSource saxSource = sqlxml.getSource(SAXSource.class);
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* XMLReader xmlReader = saxSource.getXMLReader();
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* xmlReader.setContentHandler(myHandler);
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* xmlReader.parse(saxSource.getInputSource());
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* </pre>
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* or, to set the result value from SAX events:
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* <pre>
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* SAXResult saxResult = sqlxml.setResult(SAXResult.class);
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* ContentHandler contentHandler = saxResult.getXMLReader().getContentHandler();
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* contentHandler.startDocument();
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* // set the XML elements and attributes into the result
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* contentHandler.endDocument();
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* </pre>
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* or, to obtain StAX events:
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* <pre>
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* StAXSource staxSource = sqlxml.getSource(StAXSource.class);
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* XMLStreamReader streamReader = staxSource.getXMLStreamReader();
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* </pre>
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* or, to set the result value from StAX events:
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* <pre>
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* StAXResult staxResult = sqlxml.setResult(StAXResult.class);
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* XMLStreamWriter streamWriter = staxResult.getXMLStreamWriter();
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* </pre>
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* or, to perform XSLT transformations on the XML value using the XSLT in xsltFile
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* output to file resultFile:
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* <pre>
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* File xsltFile = new File("a.xslt");
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* File myFile = new File("result.xml");
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* Transformer xslt = TransformerFactory.newInstance().newTransformer(new StreamSource(xsltFile));
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* Source source = sqlxml.getSource(null);
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* Result result = new StreamResult(myFile);
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* xslt.transform(source, result);
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* </pre>
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* or, to evaluate an XPath expression on the XML value:
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* <pre>
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* XPath xpath = XPathFactory.newInstance().newXPath();
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* DOMSource domSource = sqlxml.getSource(DOMSource.class);
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* Document document = (Document) domSource.getNode();
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* String expression = "/foo/@bar";
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* String barValue = xpath.evaluate(expression, document);
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* </pre>
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* To set the XML value to be the result of an XSLT transform:
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* <pre>
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* File sourceFile = new File("source.xml");
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* Transformer xslt = TransformerFactory.newInstance().newTransformer(new StreamSource(xsltFile));
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* Source streamSource = new StreamSource(sourceFile);
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* Result result = sqlxml.setResult(null);
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* xslt.transform(streamSource, result);
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* </pre>
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* Any Source can be transformed to a Result using the identity transform
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* specified by calling newTransformer():
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* <pre>
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* Transformer identity = TransformerFactory.newInstance().newTransformer();
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* Source source = sqlxml.getSource(null);
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* File myFile = new File("result.xml");
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* Result result = new StreamResult(myFile);
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* identity.transform(source, result);
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* </pre>
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* To write the contents of a Source to standard output:
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* <pre>
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* Transformer identity = TransformerFactory.newInstance().newTransformer();
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* Source source = sqlxml.getSource(null);
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* Result result = new StreamResult(System.out);
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* identity.transform(source, result);
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* </pre>
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* To create a DOMSource from a DOMResult:
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* <pre>
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* DOMSource domSource = new DOMSource(domResult.getNode());
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* </pre>
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* <p>
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* Incomplete or invalid XML values may cause an SQLException when
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* set or the exception may occur when execute() occurs. All streams
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* must be closed before execute() occurs or an SQLException will be thrown.
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* <p>
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* Reading and writing XML values to or from an SQLXML object can happen at most once.
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* The conceptual states of readable and not readable determine if one
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* of the reading APIs will return a value or throw an exception.
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* The conceptual states of writable and not writable determine if one
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* of the writing APIs will set a value or throw an exception.
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* <p>
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* The state moves from readable to not readable once free() or any of the
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* reading APIs are called: getBinaryStream(), getCharacterStream(), getSource(), and getString().
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* Implementations may also change the state to not writable when this occurs.
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* <p>
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* The state moves from writable to not writeable once free() or any of the
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* writing APIs are called: setBinaryStream(), setCharacterStream(), setResult(), and setString().
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* Implementations may also change the state to not readable when this occurs.
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* <p>
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* <p>
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* All methods on the <code>SQLXML</code> interface must be fully implemented if the
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* JDBC driver supports the data type.
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*
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* @see javax.xml.parsers
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* @see javax.xml.stream
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* @see javax.xml.transform
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* @see javax.xml.xpath
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* @since 1.6
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*/
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public interface SQLXML
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{
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/**
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* This method closes this object and releases the resources that it held.
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* The SQL XML object becomes invalid and neither readable or writeable
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* when this method is called.
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*
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* After <code>free</code> has been called, any attempt to invoke a
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* method other than <code>free</code> will result in a <code>SQLException</code>
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* being thrown. If <code>free</code> is called multiple times, the subsequent
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* calls to <code>free</code> are treated as a no-op.
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* @throws SQLException if there is an error freeing the XML value.
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* @exception SQLFeatureNotSupportedException if the JDBC driver does not support
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* this method
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* @since 1.6
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*/
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void free() throws SQLException;
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/**
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* Retrieves the XML value designated by this SQLXML instance as a stream.
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* The bytes of the input stream are interpreted according to appendix F of the XML 1.0 specification.
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* The behavior of this method is the same as ResultSet.getBinaryStream()
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* when the designated column of the ResultSet has a type java.sql.Types of SQLXML.
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* <p>
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* The SQL XML object becomes not readable when this method is called and
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* may also become not writable depending on implementation.
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*
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* @return a stream containing the XML data.
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* @throws SQLException if there is an error processing the XML value.
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* An exception is thrown if the state is not readable.
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* @exception SQLFeatureNotSupportedException if the JDBC driver does not support
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* this method
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* @since 1.6
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*/
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InputStream getBinaryStream() throws SQLException;
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/**
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* Retrieves a stream that can be used to write the XML value that this SQLXML instance represents.
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* The stream begins at position 0.
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* The bytes of the stream are interpreted according to appendix F of the XML 1.0 specification
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* The behavior of this method is the same as ResultSet.updateBinaryStream()
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* when the designated column of the ResultSet has a type java.sql.Types of SQLXML.
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* <p>
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* The SQL XML object becomes not writeable when this method is called and
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* may also become not readable depending on implementation.
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*
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* @return a stream to which data can be written.
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* @throws SQLException if there is an error processing the XML value.
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* An exception is thrown if the state is not writable.
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* @exception SQLFeatureNotSupportedException if the JDBC driver does not support
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* this method
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* @since 1.6
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*/
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OutputStream setBinaryStream() throws SQLException;
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/**
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* Retrieves the XML value designated by this SQLXML instance as a java.io.Reader object.
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* The format of this stream is defined by org.xml.sax.InputSource,
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* where the characters in the stream represent the unicode code points for
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* XML according to section 2 and appendix B of the XML 1.0 specification.
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* Although an encoding declaration other than unicode may be present,
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* the encoding of the stream is unicode.
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* The behavior of this method is the same as ResultSet.getCharacterStream()
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* when the designated column of the ResultSet has a type java.sql.Types of SQLXML.
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* <p>
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* The SQL XML object becomes not readable when this method is called and
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* may also become not writable depending on implementation.
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*
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* @return a stream containing the XML data.
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* @throws SQLException if there is an error processing the XML value.
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* The getCause() method of the exception may provide a more detailed exception, for example,
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* if the stream does not contain valid characters.
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* An exception is thrown if the state is not readable.
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* @exception SQLFeatureNotSupportedException if the JDBC driver does not support
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* this method
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* @since 1.6
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*/
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Reader getCharacterStream() throws SQLException;
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/**
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* Retrieves a stream to be used to write the XML value that this SQLXML instance represents.
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* The format of this stream is defined by org.xml.sax.InputSource,
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* where the characters in the stream represent the unicode code points for
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* XML according to section 2 and appendix B of the XML 1.0 specification.
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* Although an encoding declaration other than unicode may be present,
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* the encoding of the stream is unicode.
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* The behavior of this method is the same as ResultSet.updateCharacterStream()
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* when the designated column of the ResultSet has a type java.sql.Types of SQLXML.
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* <p>
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* The SQL XML object becomes not writeable when this method is called and
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* may also become not readable depending on implementation.
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*
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* @return a stream to which data can be written.
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* @throws SQLException if there is an error processing the XML value.
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* The getCause() method of the exception may provide a more detailed exception, for example,
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* if the stream does not contain valid characters.
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* An exception is thrown if the state is not writable.
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* @exception SQLFeatureNotSupportedException if the JDBC driver does not support
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* this method
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* @since 1.6
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*/
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Writer setCharacterStream() throws SQLException;
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/**
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* Returns a string representation of the XML value designated by this SQLXML instance.
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* The format of this String is defined by org.xml.sax.InputSource,
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* where the characters in the stream represent the unicode code points for
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* XML according to section 2 and appendix B of the XML 1.0 specification.
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* Although an encoding declaration other than unicode may be present,
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* the encoding of the String is unicode.
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* The behavior of this method is the same as ResultSet.getString()
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* when the designated column of the ResultSet has a type java.sql.Types of SQLXML.
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* <p>
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* The SQL XML object becomes not readable when this method is called and
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* may also become not writable depending on implementation.
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*
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* @return a string representation of the XML value designated by this SQLXML instance.
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* @throws SQLException if there is an error processing the XML value.
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* The getCause() method of the exception may provide a more detailed exception, for example,
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* if the stream does not contain valid characters.
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* An exception is thrown if the state is not readable.
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* @exception SQLFeatureNotSupportedException if the JDBC driver does not support
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* this method
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* @since 1.6
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*/
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String getString() throws SQLException;
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/**
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* Sets the XML value designated by this SQLXML instance to the given String representation.
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* The format of this String is defined by org.xml.sax.InputSource,
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* where the characters in the stream represent the unicode code points for
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* XML according to section 2 and appendix B of the XML 1.0 specification.
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* Although an encoding declaration other than unicode may be present,
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* the encoding of the String is unicode.
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* The behavior of this method is the same as ResultSet.updateString()
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* when the designated column of the ResultSet has a type java.sql.Types of SQLXML.
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* <p>
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* The SQL XML object becomes not writeable when this method is called and
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* may also become not readable depending on implementation.
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*
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* @param value the XML value
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* @throws SQLException if there is an error processing the XML value.
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* The getCause() method of the exception may provide a more detailed exception, for example,
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* if the stream does not contain valid characters.
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* An exception is thrown if the state is not writable.
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* @exception SQLFeatureNotSupportedException if the JDBC driver does not support
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* this method
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* @since 1.6
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*/
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void setString(String value) throws SQLException;
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/**
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* Returns a Source for reading the XML value designated by this SQLXML instance.
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* Sources are used as inputs to XML parsers and XSLT transformers.
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* <p>
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* Sources for XML parsers will have namespace processing on by default.
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* The systemID of the Source is implementation dependent.
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* <p>
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* The SQL XML object becomes not readable when this method is called and
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* may also become not writable depending on implementation.
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* <p>
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* Note that SAX is a callback architecture, so a returned
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* SAXSource should then be set with a content handler that will
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* receive the SAX events from parsing. The content handler
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* will receive callbacks based on the contents of the XML.
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* <pre>
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* SAXSource saxSource = sqlxml.getSource(SAXSource.class);
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* XMLReader xmlReader = saxSource.getXMLReader();
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* xmlReader.setContentHandler(myHandler);
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* xmlReader.parse(saxSource.getInputSource());
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* </pre>
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*
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* @param sourceClass The class of the source, or null.
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|
364 |
* If the class is null, a vendor specifc Source implementation will be returned.
|
|
365 |
* The following classes are supported at a minimum:
|
|
366 |
* <pre>
|
|
367 |
* javax.xml.transform.dom.DOMSource - returns a DOMSource
|
|
368 |
* javax.xml.transform.sax.SAXSource - returns a SAXSource
|
|
369 |
* javax.xml.transform.stax.StAXSource - returns a StAXSource
|
|
370 |
* javax.xml.transform.stream.StreamSource - returns a StreamSource
|
|
371 |
* </pre>
|
|
372 |
* @return a Source for reading the XML value.
|
|
373 |
* @throws SQLException if there is an error processing the XML value
|
|
374 |
* or if this feature is not supported.
|
|
375 |
* The getCause() method of the exception may provide a more detailed exception, for example,
|
|
376 |
* if an XML parser exception occurs.
|
|
377 |
* An exception is thrown if the state is not readable.
|
|
378 |
* @exception SQLFeatureNotSupportedException if the JDBC driver does not support
|
|
379 |
* this method
|
|
380 |
* @since 1.6
|
|
381 |
*/
|
|
382 |
<T extends Source> T getSource(Class<T> sourceClass) throws SQLException;
|
|
383 |
|
|
384 |
/**
|
|
385 |
* Returns a Result for setting the XML value designated by this SQLXML instance.
|
|
386 |
* <p>
|
|
387 |
* The systemID of the Result is implementation dependent.
|
|
388 |
* <p>
|
|
389 |
* The SQL XML object becomes not writeable when this method is called and
|
|
390 |
* may also become not readable depending on implementation.
|
|
391 |
* <p>
|
|
392 |
* Note that SAX is a callback architecture and the returned
|
|
393 |
* SAXResult has a content handler assigned that will receive the
|
|
394 |
* SAX events based on the contents of the XML. Call the content
|
|
395 |
* handler with the contents of the XML document to assign the values.
|
|
396 |
* <pre>
|
|
397 |
* SAXResult saxResult = sqlxml.setResult(SAXResult.class);
|
|
398 |
* ContentHandler contentHandler = saxResult.getXMLReader().getContentHandler();
|
|
399 |
* contentHandler.startDocument();
|
|
400 |
* // set the XML elements and attributes into the result
|
|
401 |
* contentHandler.endDocument();
|
|
402 |
* </pre>
|
|
403 |
*
|
|
404 |
* @param resultClass The class of the result, or null.
|
|
405 |
* If resultClass is null, a vendor specific Result implementation will be returned.
|
|
406 |
* The following classes are supported at a minimum:
|
|
407 |
* <pre>
|
|
408 |
* javax.xml.transform.dom.DOMResult - returns a DOMResult
|
|
409 |
* javax.xml.transform.sax.SAXResult - returns a SAXResult
|
|
410 |
* javax.xml.transform.stax.StAXResult - returns a StAXResult
|
|
411 |
* javax.xml.transform.stream.StreamResult - returns a StreamResult
|
|
412 |
* </pre>
|
|
413 |
* @return Returns a Result for setting the XML value.
|
|
414 |
* @throws SQLException if there is an error processing the XML value
|
|
415 |
* or if this feature is not supported.
|
|
416 |
* The getCause() method of the exception may provide a more detailed exception, for example,
|
|
417 |
* if an XML parser exception occurs.
|
|
418 |
* An exception is thrown if the state is not writable.
|
|
419 |
* @exception SQLFeatureNotSupportedException if the JDBC driver does not support
|
|
420 |
* this method
|
|
421 |
* @since 1.6
|
|
422 |
*/
|
|
423 |
<T extends Result> T setResult(Class<T> resultClass) throws SQLException;
|
|
424 |
|
|
425 |
}
|