Is there a SAX parser with PL/SQL??

Hi All,
I am a Oracle developer and generally want to do everything from PL/SQL.
So, from a PL/SQL procedure I would like to parse a XML document. I have tried hard to find a PL/SQL package which can give me a PL/SQL SAX parser, but could not find one.
All packages are based on DOM tree.
Please convey if I am wrong and is there a SAX parser?
I know that there is only one package DBMS_XMLSTORE which is C based and uses SAX parser, but it does not have procedures/functions like ".parse()".
Thanks and regards

Here's an example
SQL> --
SQL> define MODULE=SaxProcessor
SQL> define CLASS=com/oracle/st/xmldb/pm/examples/SaxProcessor
SQL> --
SQL> set define off
SQL> --
SQL> var sourceFileName varchar2(32)
SQL> var targetPath varchar2(1024)
SQL> --
SQL> begin
2    :sourceFileName := 'JavaSource';
3    :targetPath := '/public/' || :sourceFileName || '.java';
4 end;
5 /
PL/SQL procedure successfully completed.
SQL> declare
2    res boolean;
3    javaSource clob :=
4 'package com.oracle.st.xmldb.pm.examples;
5
6
7 import java.io.IOException;
8 import java.io.StringWriter;
9
10 import java.io.Writer;
11
12 import java.sql.DriverManager;
13 import java.sql.SQLException;
14
15 import java.util.Enumeration;
16 import java.util.Hashtable;
17
18 import oracle.jdbc.OracleConnection;
19 import oracle.jdbc.OracleDriver;
20
21 import oracle.jdbc.OraclePreparedStatement;
22
23 import oracle.sql.BFILE;
24
25 import oracle.sql.CLOB;
26
27 import oracle.xml.parser.v2.SAXParser;
28 import oracle.xml.parser.v2.XMLDocument;
29 import oracle.xml.parser.v2.XMLElement;
30
31
32 import org.w3c.dom.Attr;
33 import org.w3c.dom.Element;
34 import org.w3c.dom.Node;
35
36 import org.xml.sax.Attributes;
37 import org.xml.sax.ContentHandler;
38 import org.xml.sax.Locator;
39 import org.xml.sax.SAXException;
40
41 public class SaxProcessor implements ContentHandler {
42
43      public static final boolean DEBUG = true;
44
45      private OracleConnection dbConnection;
46
47      private OraclePreparedStatement insertStatement;
48      private OraclePreparedStatement errorStatement;
49      private CLOB clob;
50
51      private Hashtable namespaceToPrefix = null;
52      private Hashtable prefixToNamespace = null;
53      private String targetElementName = null;
54
55      private XMLDocument currentDocument;
56      private Node currentNode;
57
58      private int documentCount = 0;
59
60      public SaxProcessor() {
61          this.namespaceToPrefix = new Hashtable();
62          this.prefixToNamespace = new Hashtable();
63      }
64
65      private boolean isTargetElement(String elementName) {
66          return ((this.currentDocument == null) &&
67                  (elementName.equals(this.targetElementName)));
68      }
69
70      public void startDocument() throws SAXException {
71      }
72
73      public void endDocument() throws SAXException {
74      }
75
76      public void startElement(String namespaceURI, String localName, String elementName, Attributes attrs)
77      throws SAXException
78      {
79          if (DEBUG) {
80              System.out.println("startElement() : URI = " + namespaceURI + ", localName = " + localName + ", elementName = " + elementNa
me);
81          }
82          if (this.currentDocument == null)
83          {
84              if (DEBUG) {
85                  System.out.println("startElement() : Checking for start of Fragment.");
86              }
87              if (isTargetElement(localName))
88              {
89                  if (DEBUG) {
90                      System.out.println("startElement() : Starting New Document");
91                  }
92                  this.currentDocument = new XMLDocument();
93                  this.currentNode = this.currentDocument;
94                  XMLElement rootElement = createNewElement(namespaceURI, localName, elementName, attrs);
95                  this.currentDocument.appendChild(rootElement);
96                  this.currentNode = rootElement;
97              }
98          }
99          else
100          {
101             XMLElement nextElement = createNewElement(namespaceURI, localName, elementName, attrs);
102             this.currentNode.appendChild(nextElement);
103             this.currentNode = nextElement;
104          }
105      }
106
107      public void endElement(String namespaceURI, String localName, String qName)
108      throws SAXException
109      {
110          if (this.currentDocument != null)
111          {
112              if (this.currentNode.equals(this.currentDocument.getDocumentElement()))
113              {
114                  try
115                  {
116                    insertDocument();
117                    this.currentDocument = null;
118                  }
119                  catch (SQLException sqlE)
120                  {
121                      throw new SAXException(sqlE);
122                  }
123                  catch (IOException ioe)
124                  {
125                      throw new SAXException(ioe);
126                  }
127              }
128              else
129              {
130                  this.currentNode = this.currentNode.getParentNode();
131              }
132          }
133      }
134
135      private XMLElement createNewElement(String namespaceURI, String localName,
136                                          String elementName, Attributes attrs) {
137          XMLElement newElement = null;
138          if (namespaceURI != null) {
139              if (this.namespaceToPrefix.containsKey(namespaceURI)) {
140                  /* Namespace in already in Scope - create Element from Qualified Name */
141                  newElement =
142                      (XMLElement)this.currentDocument.createElement(elementName);
143              } else {
144                  /* Namespace is not already in Scope - create Element with namespace */
145                  newElement =
146                      (XMLElement) this.currentDocument.createElementNS(namespaceURI,
147                                                                                elementName);
148                  newElement.setPrefix((String)this.namespaceToPrefix.get(namespaceURI));
149              }
150          } else {
151              newElement =
152                  (XMLElement)this.currentDocument.createElement(localName);
153          }
154          addAttributes(newElement, attrs);
155          if (this.currentNode.equals(this.currentDocument)) {
156              addNamespaceDeclarations(newElement);
157          }
158          return newElement;
159      }
160
161      private void addAttributes(Element element, Attributes attrs) {
162          for (int i = 0; i < attrs.getLength(); i++) {
163              if (attrs.getURI(i).equals("http://www.w3.org/2000/xmlns/")) {
164              } else {
165                  element.setAttribute(attrs.getQName(i), attrs.getValue(i));
166              }
167          }
168      }
169
170      private void addNamespaceDeclarations(Element element) {
171          Enumeration keys = this.namespaceToPrefix.keys();
172          while (keys.hasMoreElements()) {
173              String namespace = (String)keys.nextElement();
174              String prefix = (String)namespaceToPrefix.get(namespace);
175              Attr attr = null;
176              if (prefix.equals("")) {
177                  attr = this.currentDocument.createAttribute("xmlns");
178                  attr.setValue(namespace);
179                  element.setAttributeNode(attr);
180              } else {
181                  if (!prefix.equals(element.getPrefix())) {
182                      attr =
183                          this.currentDocument.createAttribute("xmlns:" + prefix);
184                      attr.setValue(namespace);
185                      element.setAttributeNode(attr);
186                  }
187              }
188          }
189      }
190
191      public void characters(char[] p0, int p1, int p2) throws SAXException {
192          if (this.currentDocument != null) {
193              StringWriter sw = new StringWriter();
194              sw.write(p0, p1, p2);
195              String value = sw.toString();
196              Node textNode = this.currentDocument.createTextNode(value);
197              this.currentNode.appendChild(textNode);
198          }
199      }
200
201      public void startPrefixMapping(String prefix,
202                                     String uri) throws SAXException {
203          this.namespaceToPrefix.put(uri, prefix);
204          this.prefixToNamespace.put(prefix, uri);
205      }
206
207      public void endPrefixMapping(String prefix) throws SAXException {
208          Enumeration e = prefixToNamespace.keys();
209          while (e.hasMoreElements()) {
210              String thisPrefix = (String)e.nextElement();
211              if (thisPrefix.equals(prefix)) {
212                  String namespace =
213                      (String)prefixToNamespace.remove(thisPrefix);
214                  namespaceToPrefix.remove(namespace);
215              }
216          }
217      }
218
219      public void ignorableWhitespace(char[] p0, int p1,
220                                      int p2) throws SAXException {
221          // throw new SAXException ("Un-Implemented Method: ingnoreableWhitespace");
222      }
223
224      public void processingInstruction(String p0,
225                                        String p1) throws SAXException {
226          throw new SAXException("Un-Implemented Method: processingInstruction");
227      }
228
229      public void setDocumentLocator(Locator p0) {
230          // throw new SAXException ("Un-Implemented Method: setDocumentLocator");
231      }
232
233      public void skippedEntity(String p0) throws SAXException {
234          throw new SAXException("Un-Implemented Method: skippedEntity");
235      }
236
237      public void doParse(BFILE bfile, String targetElement,
238                             String targetTable, String errorTable) throws Exception {
239              this.targetElementName = targetElement;
240              String insertStatementText =
241                  "insert into " + targetTable + " values (xmlParse(DOCUMENT ? WELLFORMED))";
242              String errorStatementText =
243                  "insert into " + errorTable + " values (xmlParse(DOCUMENT ? WELLFORMED))";
244
245              DriverManager.registerDriver(new oracle.jdbc.OracleDriver());
246              OracleDriver ora = new OracleDriver();
247              this.dbConnection = (OracleConnection)ora.defaultConnection();
248
249              this.insertStatement =
250                  (OraclePreparedStatement)this.dbConnection.prepareStatement(insertStatementText);
251              this.errorStatement =
252                  (OraclePreparedStatement)this.dbConnection.prepareStatement(errorStatementText);
253
254              this.clob =
255                  CLOB.createTemporary(this.dbConnection, true, CLOB.DURATION_SESSION);
256
257              SAXParser parser = new SAXParser();
258              parser.setAttribute(SAXParser.STANDALONE, Boolean.valueOf(true));
259              parser.setValidationMode(SAXParser.NONVALIDATING);
260              parser.setContentHandler(this);
261              bfile.openFile();
262              parser.parse(bfile.getBinaryStream());
263              bfile.closeFile();
264              this.insertStatement.close();
265              this.errorStatement.close();
266      }
267
268      private void insertDocument() throws SQLException, IOException {
269          this.clob.truncate(0);
270          Writer out = clob.setCharacterStream(0);
271          this.currentDocument.print(out);
272          out.close();
273
274          this.insertStatement.setClob(1, clob);
275          this.insertStatement.execute();
276
277          this.documentCount++;
278
279          if (DEBUG) {
280              System.out.println("insertDocument() : Document Inserted");
281          }
282      }
283
284      public static int parseBFile(BFILE bfile, String targetElement,
285                             String targetTable, String errorTable) throws Exception {
286          try {
287            SaxProcessor processor = new SaxProcessor();
288            processor.doParse(bfile,targetElement,targetTable,errorTable);
289            return processor.documentCount;
290          }
291          catch (Exception e) {
292            e.printStackTrace(System.out);
293            throw e;
294          }
295
296      }
297 }
298 ';
299 begin
300    if dbms_xdb.existsResource(:targetPath) then
301      dbms_xdb.deleteResource(:targetPath);
302    end if;
303    res := dbms_xdb.createResource(:targetPath,javaSource);
304 end;
305 /
Queuing DELETE Event
PL/SQL procedure successfully completed.
SQL> --
SQL> set define on
SQL> --
SQL> create or replace and resolve java source
2 named "&MODULE"
3 using blob
4 (
5 select xdburiType('/public/JavaSource.java').getBlob(nls_charset_id('WE8ISO8859P1'))
6 from dual
7 )
8 /
old   2: named "&MODULE"
new   2: named "SaxProcessor"
Java created.
SQL> show errors
No errors.
SQL> --
SQL> declare
2    shortname varchar2(128);
3 begin
4    shortname := dbms_java.shortname('&CLASS');
5    execute immediate 'grant execute on "' || shortname || '" to public';
6 end;
7 /
old   4:   shortname := dbms_java.shortname('&CLASS');
new   4:   shortname := dbms_java.shortname('com/oracle/st/xmldb/pm/examples/SaxProcessor');
PL/SQL procedure successfully completed.
SQL> create or replace package SAX_PROCESSOR
2 as
3    procedure PARSE_BFILE(file BFILE, targetElement varchar2, targetTable varchar2, errorTable varchar2);
4 end;
5 /
Package created.
SQL> show errors
No errors.
SQL> --
SQL> create or replace package body SAX_PROCESSOR
2 as
3 --
4 procedure PARSE_BFILE(file BFILE, targetElement varchar2, targetTable varchar2, errorTable varchar2)
5 AS LANGUAGE JAVA
6     NAME 'com.oracle.st.xmldb.pm.examples.SaxProcessor.parseBFile( oracle.sql.BFILE, java.lang.String, java.lang.String, java.lang.Strin
g)';
7 end;
8 /
Package body created.
SQL> show errors
No errors.
SQL> --
SQL> drop table PO_TEST
2 /
Table dropped.
SQL> create table PO_TEST of XMLTYPE
2 /
Table created.
SQL> drop table PO_ERROR
2 /
Table dropped.
SQL> create table PO_ERROR of XMLTYPE
2 /
Table created.
SQL> create or replace directory xmldir as 'c:\temp'
2 /
Directory created.
SQL> set serveroutput on
SQL> --
SQL> call SAX_PROCESSOR.PARSE_BFILE(bfilename('XMLDIR','testcase.xml'),'PurchaseOrder','PO_TEST','PO_ERROR')
2 /
call SAX_PROCESSOR.PARSE_BFILE(bfilename('XMLDIR','testcase.xml'),'PurchaseOrder','PO_TEST','PO_ERROR')
ERROR at line 1:
ORA-29549: class XFILES.com/oracle/st/xmldb/pm/examples/SaxProcessor has
changed, Java session state cleared
SQL> call SAX_PROCESSOR.PARSE_BFILE(bfilename('XMLDIR','testcase.xml'),'PurchaseOrder','PO_TEST','PO_ERROR')
2 /
Call completed.
SQL> select count(*) from PO_TEST
2 /
         3
SQL> select * from PO_TEST
2 /
<PurchaseOrder xsi:noNamespaceSchemaLocation="http://xfiles:8080/home/SCOTT/poSo
urce/xsd/purchaseOrder.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance
">
<Reference>AMCEWEN-20030409123336271PDT</Reference>
<Actions>
    <Action>
      <User>KPARTNER</User>
    </Action>
</Actions>
<Reject/>
<Requestor>Allan D. McEwen</Requestor>
<User>AMCEWEN</User>
<PurchaseOrder xsi:noNamespaceSchemaLocation="http://xfiles:8080/home/SCOTT/poSo
urce/xsd/purchaseOrder.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance
">
<Reference>SKING-20030409123336321PDT</Reference>
<Actions>
    <Action>
      <User>SKING</User>
    </Action>
</Actions>
<Reject/>
<Requestor>Steven A. King</Requestor>
<User>SKING</User>
<PurchaseOrder xsi:noNamespaceSchemaLocation="http://xfiles:8080/home/SCOTT/poSo
urce/xsd/purchaseOrder.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance
">
<Reference>SMCCAIN-20030409120030451PDT</Reference>
<Actions>
    <Action>
      <User>SVOLLMAN</User>
    </Action>
</Actions>
<Reject/>
<Requestor>Samuel B. McCain</Requestor>
<User>SMCCAIN</User>
SQL>

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               //JDBC part
               try     {
                    System.err.println("DEBUG sendSQL");
                    Statement sql_statement = sql_connection.createStatement();
                    ResultSet resultSet = sql_statement.executeQuery( event.toSQL() );
               catch (SQLException e)     {
                    e.printStackTrace();
     /* Parsing XML
      * From here onwards it's all designed for the SAX Parsing with different event calling methods
     public void startDocument()     {
          System.err.println("Start Document");
     public void endDocument()     {
          System.err.println("End Document");
     public void startElement(String uri, String name, String qName, Attributes atts)     {
          CurrentElement= name;
          System.out.println("This is parsing");
     public void characters(char ch[], int start, int length)     {
          SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
          StringBuffer sb = new StringBuffer();
          for (int i = start; i < start + length; i++)
               sb.append(ch);
          String content = sb.toString();
          if (CurrentElement.equals("eid"))
               temp.setEventID( (Integer.valueOf(content)).intValue() ) ;
          else if (CurrentElement.equals("sd"))
               temp.setShort_description(content);
          else if (CurrentElement.equals("ld"))
               temp.setLong_description(content);
          else if ( (CurrentElement.equals("dt")))
               temp.setDate_Time( formatter.parse(content, new ParsePosition(0)) );
          else if (CurrentElement.equals("repeat"))
               temp.setRepeat_pattern( (Integer.valueOf(content)).intValue() );
          else if (CurrentElement.equals("valid"))
               temp.setValid_period(content);
          else if (CurrentElement.equals("status"))     {
               temp.setStatus( (Integer.valueOf(content)).intValue() );
          else {}
     public void endElement(String uri, String name, String qName)     {
          System.err.println("DEBUG" + temp.toString()); /*debug*/
          if (name.equals("event"))     {
               try     {
                    /*debug*/ temp.setUserID(1);
                    /*debug*/ System.err.println("DEBUG: " + temp.toString());
                    sendSQL(temp, db_connection);
                    //temp = new Event();
               catch (SQLException e)     {
                    System.err.println(e);
               }//end catch
          }//end try
Where event is a public class Event     {
     //fields
     private int userID = 1; // = 1 only applies for testing
     private int eventID;
     private String short_description;
     private String long_description;
     private Date date_time = null;
     private int repeat_pattern;
     private String valid_period;
     private int status;     //1 for new, 0 for modification and -1 for delete
     SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
     //Constructors
     //every event requires the following: userID eventID and short_Description
     public Event(int uID, int eID, String shortDescrp)     {
          setUserID(uID);
          setEventID(eID);
          setShort_description(shortDescrp);
     public Event(int uid, int eid, String sd,
                              String ld, Date d_t, int r_p, String v_p, int s)     {
          setUserID(uid);
          setEventID(eid);
          setShort_description(sd);
          setLong_description(ld);
          setDate_Time(d_t);
          setRepeat_pattern(r_p);
          setValid_period(v_p);
          setStatus(s);
     //set
     public void setUserID (int x)                         { this.userID = x ;}
     public void setEventID (int x)                         { this.eventID = x ;}
     public void setShort_description (String x)          { this.short_description = x ;}
     public void setLong_description (String x)          { this.long_description = x ;}
     public void setDate_Time(Date x)                    { this.date_time = x ;}
     public void setRepeat_pattern (int x)               { this.repeat_pattern = x ;}
     public void setValid_period (String x)               { this.valid_period = x ;}
     public void setStatus (int x)                         { this.status = x; }
     //get
     public int           getUserID()                              { return this.userID;}
     public int           getEventID()                         { return this.eventID;}
     public String      getShort_description()               { return this.short_description;}
     public String      getLong_description()               { return this.long_description;}
     public Date        getDate_Time()                         { return this.date_time;}
     public int         getRepeat_pattern()                    { return this.repeat_pattern;}
     public String      getValid_period()                    { return this.valid_period;}
     public int           getStatus()                              { return this.status; }
     //Event to SQL statements;
     public String toSQL()     {
          StringBuffer sb = new StringBuffer();
          ///if ( status == 1)     {
               sb.append( "INSERT INTO events SET" );
               sb.append( " userID = " + userID + ", ");
               sb.append( "eventID = " + eventID + ", " );
               sb.append( "short_description = " + "\'" + short_description + "\'" + ", "); //String
               sb.append( "long_description = " + "\'" + long_description + "\'" + ", "); //String
               sb.append( "date_time = " + "\'" + formatter.format(date_time) + "\'" + ", ");
               sb.append( "repeat_pattern = " + repeat_pattern + ", " );
               sb.append( "valid_period = " + "\'" + valid_period + "\'" ); //String
               sb.append( ";");
          //} else if ( status == 2)      {
          System.err.println(sb.toString());
          return sb.toString();
}     My question is: I have taken my SQL query generated by toSQL() method in events and it worked.
Here is the funny thing:
Everything is correct syntax wise: No complaints what soever
The mysql part works: Tested separately.
So I tend to think that the problem lies within the SAX parser. I have written SAX2 parsers on this machine before and they have worked too. I tried inserting println statements all over startElement endElement etc etc only to find out that the SAX parser did not call any of the methods that I overided!! Why is that so?
Can you guys spot where my SAX parser fails?

I see.
I try to correct this problem by removing super();
so right now my code looks like this:
     static Event temp = new Event(0, 0, "null", "null", new Date(), 0, "null", 0);
     static String CurrentElement = null;
     static File XMLpath;
     static Connection db_connection;
     static XMLReader xr;
     static DefaultHandler XMLSAXhandler;
     //Constructor,      Build the SAX Parser
     public EventXMLParser(File path, Connection connection)     {
          try     {
               this.XMLpath = path;
               this.db_connection = connection;
               this.xr = XMLReaderFactory.createXMLReader();
               this.XMLSAXhandler = new DefaultHandler(); //create a new own handler
               this.xr.setContentHandler(XMLSAXhandler);
               this.xr.setErrorHandler(XMLSAXhandler);
               //System.out.println("DEBUG: db_connection is " + db_connection.toString());
          catch (Exception e)     {
               System.out.println("Constructor Error!");
               e.printStackTrace();
     }This time, I created a new instance of default handler() which can be referenced by as the objects's XMLSAXhandler. However, that did not solve the problem, why does the problem still persist?
Right now, there is only one instance of a default handler created. So why does all my parsing event functions still get ignored?

SAX Parser in OC4J

I'm trying to read a XML file in an EJB using a SAX parser.
I tried the following statement to create the reader
XMLReader xr = XMLReaderFactory.createXMLReader("oracle.xml.parser.v2.SAXParser");
but I obtain the following exception:
java.lang.ClassNotFoundException: oracle.xml.parser.v2.SAXParser
at org.xml.sax.helpers.XMLReaderFactory.createXMLReader(XMLReaderFactory.java:118)
The same works correctly from a command line application outside OC4J.
Is there another SAX Parser I can use in OC4J?
Andrea Mattioli

I'm also seeing the a similar problem trying to get my EJB to parse SAX using the Xerces parser. If I do
XMLReader myReader = XMLReaderFactory.createXMLReader("org.apache.xerces.parsers.SAXParser");
and place xerces.jar into $(OC4J_INSTALL_ROOT)\j2ee\home\lib then at runtime I get
java.lang.ClassNotFoundException: org.apache.xerces.parsers.SAXParser
This is despite the fact that calling Class.forName() on the same class name works fine. Setting the system property org.xml.sax.driver and calling createXMLReader with no parameters results in the same error.
I can force use of the Xerces SAX parser by bypassing the factory and just calling
XMLReader myReader = new org.apache.xerces.parsers.SAXParser();
but that seems a tad hacky and I don't want to hardwire SAX parser implementation choice into my code.
Is this a known bug?
Also which parser is getting used by default in OC4J i.e. if I don't set org.xml.sax.driver and use the no parameters variant of createXMLReader()?
Thanks
Alan

XDK for C - SAX Parser Memory Problem

Hi,
I'm using the SAX Parser with custom Callbacks with XDK for C - version : Oracle XML Parser 9.2.0.6.0.
i'm parsing a single large XML file using the custom callbacks.
The issue i'm facing that the SAX Parser does not release any memory till complete parsing is over for the whole document(until xmlterm is called). This causes the parser to fail with LPX-00002 : OUT OF MEMORY error before the document parsing is complete.
I tried using custom memory callbacks but what i noticed is that the parser does not invoke the free Memory callback untill xmlterm is invoked.
If anybody has found an alternative to allow memory to be freed while SAX parsing is going on pls help me too.
Regards,
Vineet Mago

Can you send the test case?

How to deal with empty tags in a SAX Parser

Hi,
I hope someone can help me with the problem I am having!
Basically, I have written an xml-editor application. When an XML file is selected, I parse the file with a SAX parser and save the start and end locations of all the tags and character data. This enables me to display the xml file with the tags all nicely formatted with pretty colours. Truly it is a Joy To Behold. However, I have a problem with tags in this form:
<package name="boo"/>
because the SAX parser treats them like this:
<package name = boo>
</package>
for various complex reasons the latter is unaccetable so my question is: Is there some fiendishly clever method to detect tags of this type as they occur, so that I can treat them accordingly?
Thanks,
Chris

I have spent some time on googling for code doing this, but found nothing better, than I had to write in by myself.
So, it would be something like this. Enjoy :)
package comd;
import org.xml.sax.helpers.DefaultHandler;
import org.xml.sax.SAXException;
import org.xml.sax.Attributes;
import java.util.Stack;
import java.util.Enumeration;
public class EmptyTagsHandler extends DefaultHandler {
     private StringBuilder xmlBuilder;
     private Stack<XmlElement> elementStack;
     private String processedXml;
     private class XmlElement{
          private String name;
          private boolean isEmpty = true;
          public XmlElement(String name) {
               this.name = name;
          public void setNotEmpty(){
               isEmpty = false;
     public EmptyTagsHandler(){
          xmlBuilder = new StringBuilder();
          elementStack = new Stack();
     private String getElementXPath(){
          StringBuilder builder = new StringBuilder();
          for (Enumeration en=elementStack.elements();en.hasMoreElements();){
               builder.append(en.nextElement());
               builder.append("/");
          return builder.toString();
     public String getXml(){
          return processedXml;
     public void startDocument() throws SAXException {
          xmlBuilder = new StringBuilder();
          elementStack.clear();
          processedXml = null;
     public void endDocument() throws SAXException {
          processedXml = xmlBuilder.toString();
     public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
          if (!elementStack.empty()) {
               XmlElement elem = elementStack.peek();
               elem.setNotEmpty();
          xmlBuilder.append("<");
          xmlBuilder.append(qName);
          for (int i=0; i<attributes.getLength();i++){
               xmlBuilder.append(" ");
               xmlBuilder.append(attributes.getQName(i));
               xmlBuilder.append("=");
               xmlBuilder.append(attributes.getValue(i));
          xmlBuilder.append(">");
          elementStack.push(new XmlElement(qName));
     public void endElement(String uri, String localName, String qName) throws SAXException {
          XmlElement elem = elementStack.peek();
          if (elem.isEmpty) {
               xmlBuilder.insert(xmlBuilder.length()-1, "/");
          } else {
               xmlBuilder.append("</");
               xmlBuilder.append(qName);
               xmlBuilder.append(">");
          elementStack.pop();
     public void characters(char ch[], int start, int length) throws SAXException {
          if (!elementStack.empty()) {
               XmlElement elem = elementStack.peek();
               elem.setNotEmpty();
          String str = new String(ch, start, length);
          xmlBuilder.append(str);
     public void ignorableWhitespace(char ch[], int start, int length) throws SAXException {
          String str = new String(ch, start, length);
          xmlBuilder.append(str);
}

Create document with PL/SQL xml parser

Hello,
I'm trying to create a document with PL/SQL package xmldom on 8.1.7 and write to a file.
The problem is that my file is empty when it's created.
Can anyone send me an example of this simple problem or fullfill my example so it's works.
As you understand I'm new in using XML. :)
My example is:
declare
doc xmldom.DOMDocument;
n xmldom.DOMNode;
e xmldom.domelement;
t xmldom.domtext;
begin
doc := xmldom.newdomdocument;
t := xmldom.createtextnode(doc, 'ROOT');
n := xmldom.makenode(t);
doc := xmldom.makedocument(n);
xmldom.writetofile(doc, 'd:\orant\xdk\plsql\demo\test.xml');
end;
Regards
Hekan

Your problem may be memory for the JavaVM. Remember, the PL/SQL
parser uses the Java XML Parser APIs which run in a VM instance.
Are you running Oracle 8i? If you are you can access our Java
XML parser loaded in 8i's VM directly from your PL/SQL code.
That is in fact how our PL/SQL Parser does it.
Finally, we have no experience loading other XML Parsers into
Oracle.
Oracle XML Team
http://technet.oracle.com
Oracle Technology Network
Premal Mehta (guest) wrote:
: Hi,
: I asked about his a few days back. Pl/SQL parser does not
work
: for XML files of size greater then 500Kb. You replied saying
: that there were no such problem.
: However whenever I try, either I get some exception or
Pl/SQL
: crashes due to memory error. I am clueless. Is there some
: setting that I can do to get away with the problem? Please
: guide...
: Also, tell me about the alternatives.
: Can I write code in Java and load these class filesin Oracle
: and then reference these classes from Pl/SQL code. Can I load
: any other parser for Java in Oracle.
: Looking forward for help...
: Premal.
null

Is there a SAX parser with PL/SQL??

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