HOWTO: Writing Out XML Query Results of Any Size in Java with XML SQL Utility

Question

A customer mailed me asking for an example of how to use our XML SQL Utility to write out query results for tons of query result rows.
With tons of data, the getXMLDOM() and getXMLString() methods are not really appropriate due to the size.
The XML SQL Utility offers a getXMLSAX() method that streams SAX2 events to report the data being queried. This is the approach we can use to handle data of any size.
It dawned on me today that by putting together the XML SQL Utilities getXMLSAX() routine, and the oracle.xml.parser.v2.XSLSAXPrintDriver SAX2 ContentHandler, we can effectively stream out data of any length to an appropriate writer.
Here's a code example to get the point across:
package test;
import java.io.BufferedOutputStream;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.Driver;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.Properties;
import javax.xml.transform.OutputKeys;
import oracle.jdbc.OracleDriver;
import oracle.xml.parser.v2.XSLException;
import oracle.xml.parser.v2.XSLOutput;
import oracle.xml.parser.v2.XSLSAXPrintDriver;
import oracle.xml.sql.query.OracleXMLQuery;
public class Example  {
  private static final String QUERY = "select * from emp";
  public static void main(String[] args) throws Throwable  {
      Connection conn = getConnection();
      OracleXMLQuery q = new OracleXMLQuery(getConnection(),QUERY);
      // Any printwriter will do. Here's we're output to standard out.
      PrintWriter output = new PrintWriter(new BufferedOutputStream(System.out));
      // This is a SAX2 Content Handler used by the Oracle XSLT Engine
      // to serialize a stream of sax2 events as an XML document
      // We'll use it to serialize the sax2 events from the XML SQL Utility
      // out as an XML document.
      XSLSAXPrintDriver ch = new XSLSAXPrintDriver(output, outputOptions());  
      // This asks XML SQL Utility to fire sax events for the data
      // being fetched instead of creating DOM nodes or returning text.
      // By using the XSLSAXPrintDriver content handler, these events
      // get handled by writing them directly to the output stream
      q.getXMLSAX(ch);
      ch.flush();
      q.close();
      conn.close();     
  private static XSLOutput outputOptions() throws XSLException {
    XSLOutput x = new XSLOutput();
    Properties props = new Properties();
    props.put(OutputKeys.METHOD,"xml");
    props.put(OutputKeys.INDENT,"yes");  // Set to "no" for non-indented
    x.setProps(props);
    return x;
  public static Connection getConnection() throws SQLException {
    String username = "scott";
    String password = "tiger";
    String thinConn = "jdbc:oracle:thin:@localhost:1521:ORCL";
    Driver d = new OracleDriver();
    return DriverManager.getConnection(thinConn,username,password);
}

Answer 1

Hi Uber,
This is a known issue that error occurs when running report "Count of instances of specific software registered with Add or Remove Programs" due to non-printable characters for XML. Based on internal research, the hotfix for this issue will be
included in the System Center 2012 Configuration Manager Service Pack 1.
As a workaround, you can remove the nonprintable character populated into the report parameter by referring to the following KB article:
http://support.microsoft.com/KB/914159
Hope this helps.
Regards,
Mike Yin
Mike Yin
TechNet Community Support