Uploading a csv file through XDB FTP

Question

Hello
I'm developing a project where i need to upload a big amount of data, contained in a CSV file, on the file system of a database server and it would be great if the FTP service provided with XDB could be used to achieve such a job.
Does somebody know if XDB-FTP is able to upload files outside the XML repository and to upload them directly ( without intermediate steps that may generate heavy redo-log generation ) into a file-system on the database server?
I'd like to consider other good alternatives too, now I'm using a different FTP server but I would like to avoid this dependency.
Thanks
Bye Alessandro

Answer 1

I finally solved the problem using a Java class that launches a daemon listening for an incoming connection, that stores the first stream on a text file and then terminates.
Definition of the java class
create or replace and compile java source named SimpleFileTransfer as
import java.net.*;
import java.io.*;
class SimpleFileTransfer {
     private int port;
     private int timeout;
     private ServerSocket serverSocket;
     private int buffSize = 8192;
     private String savingFilePath;
     public SimpleFileTransfer( int port, int timeout, String fname) throws IOException,SocketException {
          this.port = port;
          this.timeout = timeout;
          this.savingFilePath = fname;
          serverSocket = new ServerSocket(port);
          serverSocket.setSoTimeout(timeout);
     public void prepareToReceive() {
          System.out.println("Preparing to receive "+savingFilePath+" on port "+port);
          (new FileWriter()).start();
          //System.out.println("Prepared to receive");
     class FileWriter extends Thread {
          Socket socket;
          BufferedReader in;
          PrintWriter out;
          public void run() {
               //System.out.println("Server started");
               try {
                    socket = serverSocket.accept();
                    //System.out.println("Ready to receive");
                    in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
                    out = new PrintWriter(savingFilePath);
                    char arr[] = new char[buffSize];
                    int readBytes;
                    while ( (readBytes = in.read(arr,0,buffSize)) >= 0 ) {
                         //System.out.println("Receive data starting with "+arr[0]);
                         out.write(arr,0,readBytes);
                         out.flush();
                    in.close();
                    out.close();
               catch (IOException e) {
                    e.printStackTrace();
               //System.out.println("Terminated");
     public static void activateService(int port,int timeout,String savingFilePath) /*throws SocketException, IOException*/ {
          try {
               SimpleFileTransfer ft = new SimpleFileTransfer(port,timeout,savingFilePath);
               ft.prepareToReceive();     
          catch (IOException e) {
               e.printStackTrace();
     public static void main(String args[]) throws IOException {
          int myPort = 21000;
          if (args[0].equals("server")) {
               activateService(myPort,10000,"C:\\\\D.dat");
          else (args[0].equals("client")) {
               Socket s = new Socket("database_host",myPort);
               BufferedReader in = new BufferedReader(new FileReader("D:\\\\D.dat"));
               PrintWriter out = new PrintWriter(s.getOutputStream());
               int readBytes;
               int buffSize = 8192;
               char arr[] = new char[buffSize];
               while ( (readBytes = in.read(arr,0,buffSize)) >= 0 ) {
                    //System.out.println("Send data starting with "+arr[0]);
                    out.write(arr,0,readBytes);
                    out.flush();
               in.close();
               out.close();
}Definition of PL/SQL wrapping procedure to activate the daemon on the database
create or replace
procedure ENABLE_TRANSFER (
          port in number,
          millis_timeout in number,
          saving_incoming_path varchar2
     ) is
language java
name 'SimpleFileTransfer.activateService(int,int,java.lang.String)';Activation of the daemon
begin
     enable_transfer(21000,10000,'C:\temp\incoming.txt');
end;Sample call to the main method of the class to work as client for uploading.
prompt> java SimpleFileTransfer clientBye Alessandro