Sax Parser for loading XML file

Question

We have a requirment by which we need to load huge XMl file in our DB everyday.
THe XML file format is like --
<?xml version="1.0" encoding="UTF-8"?>
<root>
<emp>
<ename>aaa</ename>
<sal>3000</sal>
</emp>
<emp>
<ename>bbb</ename>
<sal>5000</sal>
</emp>
<dept>
<name>productiong</name>
<location>USA</location>
<dept>
I have written XMl SAX parser to load this file into DB -
import org.xml.sax.helpers.DefaultHandler;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.XMLReader;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.Attributes;
import java.io.*;
import java.sql.*;
import oracle.jdbc.driver.*;
import oracle.xml.sql.*;
import oracle.sql.*;
import oracle.jdbc.*;
import oracle.jdbc.pool.OracleDataSource;
import java.util.*;
public class test extends DefaultHandler
String thisElement="";
String table_name="";
String table_name_2="";
String sql="";
String value_clause="";
StringBuffer value_clauseBuffer;
String Insert_sql="";
int flag;
String columnNames="";
String questionmarks="";
static String conStr = "jdbc:oracle:thin:@abcd1234:1521:dss501";
static Connection conn;
String arrayValues[] = new String[30];
int j = 0;
int emptyElementFlag = 0;
public SurveyReader() throws SQLException, FileNotFoundException, IOException{
DBConnect("username", "password");
public static void DBConnect(String username, String password)
throws SQLException, FileNotFoundException, IOException {
DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());
conn = DriverManager.getConnection(conStr, username, password);
conn.setAutoCommit(true);
public void startElement(String namespaceURI, String localName,
String qName, Attributes atts) throws SAXException {
thisElement = qName;
if (thisElement!=table_name){
columnNames = columnNames + ", " + qName;
questionmarks = questionmarks +", " + "?";
emptyElementFlag =0;
public void characters(char[] ch, int start, int length)
throws SAXException {
if (thisElement !="root"){     
if ((length == 0) && (thisElement !="") ){
table_name = thisElement;
sql = " Insert into "+ table_name +"(";
value_clause="";
value_clauseBuffer =null;
columnNames = "";
questionmarks ="";
j =0;
if ((length != 0) && (thisElement!="") && (thisElement!=table_name)){
emptyElementFlag = 1;
String s = new String(ch, start, length);
String newString = s.replaceAll("'", "''");
// String newString = s;
if (value_clauseBuffer== null){
value_clauseBuffer = new StringBuffer(newString);
else{
value_clauseBuffer.append(newString);
public void endElement(String namespaceURI, String localName, String qName)
throws SAXException {
if (thisElement !="root"){
if ((!(value_clauseBuffer == null))||((emptyElementFlag ==0) && (qName !=table_name))) {
try{
//value_clauseBuffer.append("', '");
if (value_clauseBuffer == null){
arrayValues[j]="";
else{
arrayValues[j]=""+value_clauseBuffer;
j = j+1;
value_clauseBuffer = null;
emptyElementFlag =0;
}catch(Exception e){
System.err.println(e);
System.exit(2);
if (qName == table_name){
if (!(value_clauseBuffer == null)){
value_clause = "'"+value_clauseBuffer;
columnNames =columnNames.substring(1, columnNames.length());
int paramNumber = j;
questionmarks =questionmarks.substring(1, questionmarks.length());
sql = sql + columnNames + " ) values (" + questionmarks +"); ";
Insert_sql=Insert_sql + sql;
sql = "Begin "+sql + " End; ";
     try{
     PreparedStatement pstat = conn.prepareStatement(sql);
for (int i=0; i<=j-1; i++ ){
int k = i+1;
pstat.setObject(k, arrayValues);
     ResultSet rset = pstat.executeQuery();
     rset.close();
     pstat.close();
catch (Exception e) {
System.err.println(e);
System.out.print("sql " + sql);
System.exit(1);
table_name_2 = table_name;
thisElement = "";
public static void main (String args[]) {
XMLReader xmlReader = null;
System.out.println("Time " + new java.util.Date());
try {
SAXParserFactory spfactory = SAXParserFactory.newInstance();
spfactory.setValidating(false);
SAXParser saxParser = spfactory.newSAXParser();
xmlReader = saxParser.getXMLReader();
xmlReader.setContentHandler(new SurveyReader());
xmlReader.setErrorHandler(new SurveyReader());
InputSource source = new InputSource("short.xml");
xmlReader.parse(source);
conn.close();
} catch (Exception e) {
System.err.println(e);
System.exit(1);
This parser takes 2 hours to laod file of size around 8MB.
ANy suggestions on improving performance of the parser.
ANy other approach I should be taking to load this file into DB.
We are using ORacle 9i DB with Character set UTF 8.
Thanks!

Answer 1

String buf = (new String(ch, start, length)).trim();
if (thisElement != "root"){   
if ((buf.length() == 0) && (thisElement !="") ){
It run ok!
Thanks 58871!
Now, i want to export oracle table to xml file like :
<?xml version="1.0" encoding="UTF-8"?>
<root>
<emp>
<ename>aaa</ename>
<sal>3000</sal>
</emp>
<emp>
<ename>bbb</ename>
<sal>5000</sal>
</emp>
</root>
Can SAX export to xml format?
Pham Thanh Tung