Creating an O/R layer with TopLink from Ant or a script

We're currently using JDeveloper and BC4J to generate an O/R layer that simply creates a BC4J entity for each table in our schema with the appropriate associations between tables. The problem with this approach is that it is very brittle. Any change in the database breaks the BC4J layer and we have to recreate the entire thing. Using the JDeveloper wizzard is labor intensive and we want to automate the task of creating a new O/R layer with a script or Ant task, but unfortunately there is no way to do this with JDeveloper.
Can we use TopLink to generate an O/R layer using a script or Ant task instead of the workbench? It would be a great time saver for us if we could point TopLink to our schema and have it generate an entity per table with the correct associations without having to use the workbench.
Thanks.

I have seen some customers do this, although not necessarily with ANT (it was a while ago). We do ship the Deployment Descriptor DTD (search your TopLink install for *.dtd). That should help you generate the mappings. You're on your own with the code, none of the code gen API's are available on the command line outside the MW.

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Message was edited by:
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<?xml version="1.0" encoding="iso-8859-1"?>
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http://support.apple.com/kb/HT4436

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P.S. Points will be rewarded to all usefull answers.
Edited by: Armin Reichert on Jun 30, 2008 6:12 PM
Please stop this P.S. nonsense!

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          if ((tag != null) || (!tag.equalsIgnoreCase("null"))) {
               begin.append("<").append(tag).append(">");
               begin.append("<![CDATA[");
               begin.append(xmlString).append("]]>").append("</").append(
                    tag).append(
                    ">");
          return begin.toString();
     /End of Function to get EncodedXML/
     /*Begin of Function to get formated date
return: String
input: Date
     private final String formatDate(Date inputDateStr) {
          String date;
          try {
               SimpleDateFormat simpleDateFormat =
                    new SimpleDateFormat("yyyy-MM-dd");
               date = simpleDateFormat.format(inputDateStr);
          } catch (Exception e) {
               return "";
          return date;
     /End of Function to get formated date/
Code for XMLParser:-
Created on Apr 12, 2006
Author-Anish
This is a parser class
package com.idb.events.util;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;
import com.idb.events.Event;
import com.sap.tc.webdynpro.progmodel.api.IWDMessageManager;
public class XMLParser {
Enables namespace functionality in parser
     private final boolean isNameSpaceAware = true;
Enables validation in parser
     private final boolean isValidating = true;
The SAX parser used to parse the xml
     private SAXParser parser;
The XML reader used by the SAX parser
     private XMLReader reader;
This method creates the parser to parse the user details xml.
     private void createParser()
          throws SAXException, ParserConfigurationException {
          // Create a JAXP SAXParserFactory and configure it
          SAXParserFactory saxFactory = SAXParserFactory.newInstance();
          saxFactory.setNamespaceAware(isNameSpaceAware);
          saxFactory.setValidating(isValidating);
          // Create a JAXP SAXParser
          parser = saxFactory.newSAXParser();
          // Get the encapsulated SAX XMLReader
          reader = parser.getXMLReader();
          // Set the ErrorHandler
This method is used to collect the user details.
     public Event getEvent(
          String newsXML,
          XMLHandler xmlHandler,
          IWDMessageManager mgr)
          throws SAXException, ParserConfigurationException, IOException {
          //create the parser, if not already done
          if (parser == null) {
               this.createParser();
          //set the parser handler to extract the
          reader.setErrorHandler(xmlHandler);
          reader.setContentHandler(xmlHandler);
          InputSource source =
               new InputSource(new ByteArrayInputStream(newsXML.getBytes()));
          reader.parse(source);
          //return the results of the parse
          return xmlHandler.getEvent(mgr);
Code for XMLHandler:-
Created on Apr 12, 2006
Author-Anish
This is a parser class
package com.idb.events.util;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;
import com.idb.events.Event;
Created on Apr 12, 2006
Author-Anish
*This handler class is created to have constant value for variables and function for get events,
    character values for bean variable,
    parsing thr date ......etc
package com.idb.events.util;
import java.sql.Timestamp;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
import org.xml.sax.helpers.DefaultHandler;
import java.util.*;
import com.idb.events.Event;
import com.sap.tc.webdynpro.progmodel.api.IWDMessageManager;
public class XMLHandler extends DefaultHandler {
     private static final String TITLE = "title";
     private static final String ORGANIZER = "organizer";
     IWDMessageManager manager;
     private Event events;
     private String tagName;
     public void setManager(IWDMessageManager mgr) {
          manager = mgr;
This function is created to get events
     public Event getEvent(IWDMessageManager mgr) {
          manager = mgr;
          return this.events;
This function is created to get character for setting values through event's bean setter method
     public void characters(char[] charArray, int startVal, int length)
          throws SAXException {
          String tagValue = new String(charArray, startVal, length);
          if (TITLE.equals(this.tagName)) {
               this.events.setTitle(tagValue);
          if (ORGANIZER.equals(this.tagName)) {
               String orgName = tagValue;
               try {
                    orgName = getOrgName(orgName);
               } catch (Exception ex) {
               this.events.setOrganizer(orgName);
This function is created to parse boolean.
     private final boolean parseBoolean(String inputBooleanStr) {
          boolean b;
          if (inputBooleanStr.equals("true")) {
               b = true;
          } else {
               b = false;
          return b;
This function is used to call the super constructor.
     public void endElement(String uri, String localName, String qName)
          throws SAXException {
          super.endElement(uri, localName, qName);
     /* (non-Javadoc)
@see org.xml.sax.ErrorHandler#fatalError(org.xml.sax.SAXParseException)
This function is used to call the super constructor.
     public void fatalError(SAXParseException e) throws SAXException {
          super.fatalError(e);
This function is created to set the elements base on the tag name.
     public void startElement(
          String uri,
          String localName,
          String qName,
          Attributes attributes)
          throws SAXException {
          this.tagName = localName;
          if (ROOT.equals(tagName)) {
               this.events = new Event();
     public static void main(String a[]) {
          String cntry = "Nigeria";
          XMLHandler xml = new XMLHandler();
          ArrayList engList = new ArrayList();
          engList = xml.getCountries();
          ArrayList arList = xml.getArabicCountries();
          int engIndex = engList.indexOf(cntry);
          System.out.println("engIndex :: " + engIndex);
          String arCntryName = (String) arList.get(engIndex);
          System.out.println(
               ">>>>>>>>>>>>>>>>>>>>" + xml.getArabicCountryName(cntry));
Hope that may help you.
If need any help , you are most welcome.
Regards,
Deepak

How to create an internal table with fields from different sources

Hi.
I need to create an internal table where some of the fields are from a database table, and the other fields are user specified. How do i do that?
Example:
DB table ZTAB with fields ZTAB-FIELD1, ZTAB-FIELD2.
I want to create an internal table ITAB with the fields ZTAB-FIELD1, ZTAB-FIELD2 from ZTAB. In addition, I also want to have one more field RECORD_NO, which is not from ZTAB. How do I do it? Could I do something like below?
DATA BEGIN OF ITAB.
        INCLUDE STRUCTURE ZTAB.
DATA RECORD_NO TYPE I.
DATA END OF UPLINE.
Or, are there more efficient way of doing it? Thanks.

hi KIan,
go:
general type
TYPE : BEGIN OF ty_itab,
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*your own fields here:
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           END OF ty_itab.
work area
DATA : gw_itab TYPE ty_itab.
internal table
DATA : gt_itab TYPE TABLE OF ty_itab.
hope this helps
ec

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