file exist
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Thread: file exist

  1. #1
    Join Date
    Nov 2000
    Posts
    440
    I want to know if a file exist.
    i want a function that tells me if a file exist

    ex:
    c:\toto.txt


    declare
    exis boolean;
    begin
    exis := file_exist('c:\toto.txt');
    if exis = TRUE then
    --yť!
    end if;
    end;


    plaz help!

  2. #2
    Join Date
    Apr 2001
    Posts
    219
    There are a few way you can handle this and they are:

    1. use UTL_File
    2. or use Java

    UTL_File way:
    - Requires the UTL_FILE_DIR to be set with all directries that you may access. If you need to add another directory the database must be bounced.

    Java way:
    - Requires you creating a OS command and this piece of code:

    This tip comes from Dave Sienknecht, Programmer for Genesys Software Consulting in Sunnyvale, CA.

    Calling Unix commands from PL/SQL isn't a new idea, but this technique allows the user or program to execute any given OS command, view the printed output, and capture a success/fail argument.

    Directions:

    Compile the java program.
    Load it to the DB using LOADJAVA.
    Create a function call spec to call the program.
    Turn serveroutput and java output ON.

    Function Call Spec:
    ----------------------------------------
    CREATE OR REPLACE FUNCTION shellcmd (v_cmd IN VARCHAR2) RETURN NUMBER
    AS LANGUAGE JAVA
    NAME 'oscmd.mainrun(java.lang.String[]) return int';
    /


    Java Source:
    ----------------------------------------
    import java.io.*;
    import java.util.*;

    public class oscmd{
    static public int runCommand(String cmd)
    throws IOException {

    int vSubResult;
    vSubResult = 0;

    // set up list to capture command output lines
    ArrayList list = new ArrayList();

    // start command running
    Process proc = Runtime.getRuntime().exec(cmd);

    // get command's output stream and
    // put a buffered reader input stream on it
    InputStream istr = proc.getInputStream();
    BufferedReader br =
    new BufferedReader(new InputStreamReader(istr));

    // read output lines from command
    String str;
    while ((str = br.readLine()) != null)
    list.add(str);

    // wait for command to terminate
    try {
    proc.waitFor();
    }
    catch (InterruptedException e) {
    System.err.println("process was interrupted");
    vSubResult = 1;
    }

    // check its exit value
    if (proc.exitValue() != 0) {
    System.err.println("exit value was non-zero");
    vSubResult = 1;
    }

    // close stream
    br.close();

    // read all result strings into variable outlist
    String outlist1[] = (String[])list.toArray(new String[0]);

    // display the output
    for (int i = 0; i < outlist1.length; i++)
    System.out.println(outlist1[i]);

    return vSubResult;
    }

    public static int mainrun(String args[]) throws IOException {
    try {
    int vResult;

    // run the given command
    vResult = runCommand(args[0]);

    // return 0 on success, 1 on failure
    return vResult;
    }
    catch (IOException e) {
    System.err.println(e);
    return 1;
    }
    }
    }

    ______________________
    Applications come and go,
    but the data remains!

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