Query Oracle 9i xmltype tables

Question

Hi,
I have created a table of xmltype and loaded a large xml document of size ~47 MB.
I wish to execute the following query on the table(OracleBench_No_Schema) using Oracle thin driver.
select extract(value(X), '//eNest[@aSixtyFour=2]')
from OracleBench_No_Schema X;
can you provide me with a skeleton code for running such queries using a java program?
thanks in advance.
Dayal

Answer 1

Hi ,
java version 1.4.2
I am using oracle jdbc drivers for java 1.4
I am using the thin driver.
This is the code that I am currently using...
import java.util.Iterator;
import org.w3c.dom.Node;
import java.sql.*;
import java.io.*;
import oracle.xquery.*;
import oracle.xquery.exec.*;
import oracle.xml.parser.v2.*;
import oracle.xdb.XMLType;
import oracle.sql.OPAQUE;
import oracle.xdb.XMLType;
import oracle.jdbc.pool.OracleDataSource;
import oracle.jdbc.OraclePreparedStatement;
import oracle.jdbc.OracleResultSet;
public class OracleXMLTypeQuery
public static void main(String[]args)
String query = "select extract(value(X), '//eNest[@aSixtyFour=2]').getClobVal() \n" +
"from OracleBench_No_Schema X";
try
     DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());
Connection conn = DriverManager.getConnection("jdbc:oracle:thin:@138.87.169.78:1521:itkora2","dmuruku","dmuruku");
OraclePreparedStatement stmt = (OraclePreparedStatement) conn.prepareStatement(query);
System.out.println("Executing Query...");
OracleResultSet orset = (OracleResultSet)stmt.executeQuery();
          System.out.println("Query Executed....");
while(orset.next())
oracle.sql.CLOB clob = orset.getCLOB(1);               
     Reader reader = clob.getCharacterStream();
//----------------These set of lines when included in the program are causing protocol violation---------
StringBuffer clobBuffer = new StringBuffer();
               char[] buffer = new char[1024];
               int readCount;
                    while ( (readCount = reader.read(buffer)) != -1)
                         {        clobBuffer.append(buffer, 0, readCount);    }
               //This included...protocol violation          
conn.close();
catch(Exception ex)
System.out.println(ex.toString());
As I mentioned the lines of code between the two commenting lines when Included in the program are causing a protocol violation.
(java.io.IOException: Protocol Violation).
Is there any other way to read data from a Reader Object into a file or to display it on the console output?
please advise
Thanks
DL