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  • Category: ASP.NET

    upload file in Oracle Database

    Hi,
    I m developing an application in which i want to upload the file in Oracle database.I have searched on net but i got the answers in which they are using Blob datatype.But which i m using oracle it dosent support Blob datatype.
    pl. send me the code or a link.
  • #329216
    Read Following:
    ---------------

    For this procedure to work the HTTP Server software, available on the Companion CD, must be installed into a separate ORACLE_HOME, typically:

    /u01/app/oracle/product/10.1.0/client_1

    The example assumes the the ORACLE_HOME environment variable has been set to this path also:

    ORACLE_HOME=/u01/app/oracle/product/10.1.0/client_1; export ORACLE_HOME

    Oracle provide a mechanism to upload and download files directly from the database using a Database Access Descriptor (DAD). In this article I'll demonstrate how it works with a simple example.

    First a Database Access Descriptor (DAD) must be created. Add the following entry to the $ORACLE_HOME/Apache/modplsql/conf/dads.conf file:

    <Location /pls/UTILS>
    SetHandler pls_handler
    Order deny,allow
    Allow from all
    AllowOverride None
    PlsqlDatabaseUsername utils
    PlsqlDatabasePassword utils
    PlsqlDatabaseConnectString dev
    PlsqlAuthenticationMode Basic
    PlsqlDocumentTablename utils.documents
    PlsqlDocumentPath docs
    PlsqlDocumentProcedure document_api.download
    </Location>

    Run the following command to obfuscate the DAD password:

    cd $ORACLE_HOME/Apache/modplsql/conf/
    perl dadTool.pl -o

    Make sure the PlsqlDatabaseConnectString parameter value has a corresponding entry in the "$ORACLE_HOME/network/admin/tnsnames.ora" file for the client ORACLE_HOME. With this in place restart the HTTP server using the following commands:

    $ORACLE_HOME/opmn/bin/opmnctl stopall
    $ORACLE_HOME/opmn/bin/opmnctl startall

    For the upload to be successful the documents table must be created with the following structure:

    CREATE TABLE documents (
    name VARCHAR2(256) UNIQUE NOT NULL,
    mime_type VARCHAR2(128),
    doc_size NUMBER,
    dad_charset VARCHAR2(128),
    last_updated DATE,
    content_type VARCHAR2(128),
    blob_content BLOB
    )
    /

    Next we create a package specification which will contain all the necessary code:

    CREATE OR REPLACE PACKAGE document_api AS

    PROCEDURE upload;
    PROCEDURE upload (file IN VARCHAR2);
    PROCEDURE download;
    PROCEDURE download (file IN VARCHAR2);

    END;
    /
    SHOW ERRORS

    Then the package body:

    CREATE OR REPLACE PACKAGE BODY document_api AS

    -- ----------------------------------------------------------------------------
    PROCEDURE upload AS
    -- ----------------------------------------------------------------------------
    l_real_name VARCHAR2(1000);
    BEGIN

    HTP.htmlopen;
    HTP.headopen;
    HTP.title('Test Upload');
    HTP.headclose;
    HTP.bodyopen;

    HTP.header(1, 'Test Upload');

    HTP.print('<form enctype="multipart/form-data" action="document_api.upload" method="post">');
    HTP.print(' File to upload: <input type="file" name="file"><br />');
    HTP.print(' <input type="submit" value="Upload">');
    HTP.print('</form>');

    HTP.bodyclose;
    HTP.htmlclose;
    END upload;
    -- ----------------------------------------------------------------------------


    -- ----------------------------------------------------------------------------
    PROCEDURE upload (file IN VARCHAR2) AS
    -- ----------------------------------------------------------------------------
    l_real_name VARCHAR2(1000);
    BEGIN

    HTP.htmlopen;
    HTP.headopen;
    HTP.title('File Uploaded');
    HTP.headclose;
    HTP.bodyopen;
    HTP.header(1, 'Upload Status');

    l_real_name := SUBSTR(file, INSTR(file, '/') + 1);

    BEGIN
    -- Delete any existing document to allow update.
    DELETE FROM documents
    WHERE name = l_real_name;

    -- Update the prefixed name with the real file name.
    UPDATE documents
    SET name = l_real_name
    WHERE name = file;

    HTP.print('Uploaded ' || l_real_name || ' successfully.');
    EXCEPTION
    WHEN OTHERS THEN
    HTP.print('Upload of ' || l_real_name || ' failed.');
    HTP.print(SQLERRM);
    END;
    HTP.br;

    -- Create some links to demonstrate URL downloads.
    HTP.br;
    HTP.print('URL Downloads:');
    HTP.br;
    FOR cur_rec IN (SELECT name FROM documents) LOOP
    HTP.anchor('docs/' || cur_rec.name, 'docs/' || cur_rec.name);
    HTP.br;
    END LOOP;

    -- Create some links to demonstrate direct downloads.
    HTP.br;
    HTP.print('Direct Downloads:');
    HTP.br;
    FOR cur_rec IN (SELECT name FROM documents) LOOP
    HTP.anchor('document_api.download?file=' || cur_rec.name, 'document_api.download?file=' || cur_rec.name);
    HTP.br;
    END LOOP;

    HTP.bodyclose;
    HTP.htmlclose;
    END upload;
    -- ----------------------------------------------------------------------------


    -- ----------------------------------------------------------------------------
    PROCEDURE download IS
    -- ----------------------------------------------------------------------------
    l_filename VARCHAR2(255);
    BEGIN
    l_filename := SUBSTR(OWA_UTIL.get_cgi_env('PATH_INFO'), 2);
    WPG_DOCLOAD.download_file(l_filename);
    EXCEPTION
    WHEN OTHERS THEN
    HTP.htmlopen;
    HTP.headopen;
    HTP.title('File Downloaded');
    HTP.headclose;
    HTP.bodyopen;
    HTP.header(1, 'Download Status');
    HTP.print('Download of ' || l_filename || ' failed.');
    HTP.print(SQLERRM);
    HTP.bodyclose;
    HTP.htmlclose;
    END download;
    -- ----------------------------------------------------------------------------


    -- ----------------------------------------------------------------------------
    PROCEDURE download (file IN VARCHAR2) AS
    -- ----------------------------------------------------------------------------
    l_blob_content documents.blob_content%TYPE;
    l_mime_type documents.mime_type%TYPE;
    BEGIN
    SELECT blob_content,
    mime_type
    INTO l_blob_content,
    l_mime_type
    FROM documents
    WHERE name = file;

    OWA_UTIL.mime_header(l_mime_type, FALSE);
    HTP.p('Content-Length: ' || DBMS_LOB.getlength(l_blob_content));
    OWA_UTIL.http_header_close;

    WPG_DOCLOAD.download_file(l_blob_content);
    EXCEPTION
    WHEN OTHERS THEN
    HTP.htmlopen;
    HTP.headopen;
    HTP.title('File Downloaded');
    HTP.headclose;
    HTP.bodyopen;
    HTP.header(1, 'Download Status');
    HTP.print(SQLERRM);
    HTP.bodyclose;
    HTP.htmlclose;
    END download;
    -- ----------------------------------------------------------------------------

    END;
    /
    SHOW ERRORS

    Once this code is compiled a file can be uploaded by using the following URL format:

    # Format
    http://<server-name>:<port>/pls/<DAD>/document_api.upload

    # Example
    http://myserver:7777/pls/UTILS/document_api.upload

    Alternatively, the upload can be performed by adjusting the form action in the upload.html file.

    The second overload of the upload procedure does not really upload the file as this is done automatically by the DAD. It simply allows you to perform additional processing if necessary. Oracle prefixes a the file name with a generated folder name to reduce the posibility of name conflicts. In this example the files are renamed to their original names.

    In addition the upload code produces two types of links to test the download code. The first set of links use the "document access path" and the "document access procedure" defined in the DAD. These allow access to the files using a regular URL, masking the procedure call which actually returns the file. Using the document access path in the URL causes the DAD to call the document access procedure. The requested file name must be retrieved from the URL and used in the WPG_DOCLOAD.download_file procedure call.

    The second set of links call an alternative download procedure directly. In this case file name must be specified as a parameter.


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