• Post Reply Bookmark Topic Watch Topic
  • New Topic
programming forums Java Mobile Certification Databases Caching Books Engineering Micro Controllers OS Languages Paradigms IDEs Build Tools Frameworks Application Servers Open Source This Site Careers Other Pie Elite all forums
this forum made possible by our volunteer staff, including ...
Marshals:
  • Campbell Ritchie
  • Jeanne Boyarsky
  • Ron McLeod
  • Paul Clapham
  • Liutauras Vilda
Sheriffs:
  • paul wheaton
  • Rob Spoor
  • Devaka Cooray
Saloon Keepers:
  • Stephan van Hulst
  • Tim Holloway
  • Carey Brown
  • Frits Walraven
  • Tim Moores
Bartenders:
  • Mikalai Zaikin

xml updations and deletions

 
Greenhorn
Posts: 5
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Hi,
I ma unable to delete and update a record in the xml file till now using jaxp. I am using a dom parser .
I have generated on xm file but name say m_layout.xml from the database values. the xml file looks like this.
<xml><records="3"><record row ="1"><header_id>head</header_id>
<lenght>3</length></record>
<record row="2"><header_id>jpsin</header_id><length>4</length>
</record>
<record row="3"><header_id>xxx</header_id><lenght>5</length>
</record>
</records></xml>
This is the structure of my xml. now suppose i want to modify first record in xml . how do i do that through dom and how do i write it back into file as what ever changes are made through dom they will be in memory only. i am psting the code what ever i have writeen please give me some feed back for tdeleting updating and appending records
code
----
package dfm;
import org.w3c.dom.*;
import com.sun.xml.tree.*;
import org.xml.sax.SAXException;
import java.io.*;
import java.util.*;
public class Parser
{
String filename="";
Document doc=null;
NodeList nodelist=null, nodelist1 = null,nodelist2 = null;
Node node=null, node1 = null,node2 = null;
NamedNodeMap map1=null;

public HashMap getHashMap()
{
int length = 0;
HashMap columnNames = new HashMap();
columnNames.put("*",filename.toUpperCase());
nodelist=doc.getElementsByTagName("record");
node = nodelist.item(0);
System.out.println(node.getNodeValue());
nodelist1 = node.getChildNodes();
length = nodelist1.getLength();

for(int j = 0 ; j < length ; j++)
{
node1 = nodelist1.item(j);
System.out.println(node1.getNodeName());
columnNames.put(node1.getNodeName(),new Integer(j+1));
}

return columnNames;
}
public Parser(String filename)
{
this.filename = filename;
try
{
InputStream instream=new FileInputStream(filename);
doc = XmlDocument.createXmlDocument(instream,false);
}
catch(Exception e){e.printStackTrace();}
}
public Vector getVector()
{
int len = 0,length = 0;
Vector data = new Vector();
int rowCnt = 0;
try
{
nodelist=doc.getElementsByTagName("record");
len=nodelist.getLength();
for(int i=0;i<len;i++)
{
node = nodelist.item(i);
nodelist1 = node.getChildNodes();
length = nodelist1.getLength();
String[] currentRow = new String[length+1];
for(int j = 0 ; j < length ; j++)
{

node1 = nodelist1.item(j);
currentRow[j+1] = node1.getChildNodes().item(0).getNodeValue();
}
data.addElement(currentRow);
rowCnt++;
}
}
catch(Exception e){e.printStackTrace();}
return data;
}
public Vector getLayoutids(String extendedFlag)
{
int len = 0,length = 0;
Vector data = new Vector();
try
{
nodelist=doc.getElementsByTagName("record");
len=nodelist.getLength();
for(int i=0;i<len;i++)
{
node = nodelist.item(i);
nodelist1 = node.getChildNodes();
node1 = nodelist1.item(1);
if(node1.getChildNodes().item(0).getNodeValue().equals(extendedFlag))
{
node1 = nodelist1.item(0);
data.addElement(node1.getChildNodes().item(0).getNodeValue());
}
}
}
catch(Exception e){e.printStackTrace();}
return data;
}
public Vector getLayoutidsAndRecordlens(String extendedFlag)
{
int len = 0,length = 0;
Vector data = new Vector();
try
{
nodelist=doc.getElementsByTagName("record");
len=nodelist.getLength();
for(int i=0;i<len;i++)
{
node = nodelist.item(i);
nodelist1 = node.getChildNodes();
node1 = nodelist1.item(1);
if(node1.getChildNodes().item(0).getNodeValue().equals(extendedFlag))
{
String[] res = new String[2];
node1 = nodelist1.item(0);
res[0]=node1.getChildNodes().item(0).getNodeValue();
node1 = nodelist1.item(2);
res[1]=node1.getChildNodes().item(0).getNodeValue();
data.addElement(res);
}
}
}
catch(Exception e){e.printStackTrace();}
return data;
}
public Vector getRecordlens(String extendedFlag)
{
int len = 0,length = 0;
Vector data = new Vector();
try
{
nodelist=doc.getElementsByTagName("record");
len=nodelist.getLength();
for(int i=0;i<len;i++)
{
node = nodelist.item(i);
nodelist1 = node.getChildNodes();
node1 = nodelist1.item(1);
if(node1.getChildNodes().item(0).getNodeValue().equals(extendedFlag))
{
node1 = nodelist1.item(2);
data.addElement(node1.getChildNodes().item(0).getNodeValue());
}
}
}
catch(Exception e){e.printStackTrace();}
return data;
}
public static void main(String args[])
{
if(args.length<1)
{
System.out.println("Give the file name");
}
else
{
Parser parse=new Parser(args[0]);
}
}


}
 
No holds barred. And no bars holed. Except this tiny ad:
a bit of art, as a gift, the permaculture playing cards
https://gardener-gift.com
reply
    Bookmark Topic Watch Topic
  • New Topic