Oracleストアドプロシージャを使用して、.txtファイルを添付ファイルとして電子メールで送信します。

私はこのパッケージを使ってメールを送信します。アタッチメントで問題なく動作します。試してみてください：

CREATE OR REPLACE PACKAGE BODY SENDMAIL_PKG AS

PRIORITY_HIGH           CONSTANT INTEGER := 1;
PRIORITY_NORMAL         CONSTANT INTEGER := 3;
PRIORITY_LOW            CONSTANT INTEGER := 5;

SMTP_PORT               CONSTANT INTEGER := 25;
SMTP_SERVER             CONSTANT VARCHAR2(50) := 'mailhost';
SMTP_DOMIAN             CONSTANT VARCHAR2(50) := SYS_CONTEXT('USERENV', 'DB_DOMAIN');
MIME_BOUNDARY           CONSTANT VARCHAR2(50) := '=====Boundary======';
MIME_MIXED              CONSTANT VARCHAR2(50) := 'multipart/mixed;';
MIME_TEXT               CONSTANT VARCHAR2(50) := 'text/plain;';

DEFAULT_FROM_NAME       CONSTANT VARCHAR2(50) := SYS_CONTEXT('USERENV', 'CURRENT_SCHEMA');
DEFAULT_FROM_MAIL       CONSTANT VARCHAR2(50) := DEFAULT_FROM_NAME||'@'||SMTP_DOMIAN;



FUNCTION OpenConnection(ToEmail IN VARCHAR2, FromEmail IN VARCHAR2) RETURN UTL_SMTP.connection IS
    con UTL_SMTP.connection;
BEGIN
    -- setup mail header
    con := UTL_SMTP.OPEN_CONNECTION(SMTP_SERVER, SMTP_PORT);
    UTL_SMTP.helo(con, SMTP_DOMIAN);
    UTL_SMTP.Mail(con, LOWER(FromEmail));
    UTL_SMTP.rcpt(con, LOWER(ToEmail));
    UTL_SMTP.open_data(con);
    RETURN con;
END OpenConnection;


PROCEDURE PutHeader(con IN OUT UTL_SMTP.connection, 
    Subject IN VARCHAR2, ToEmail IN VARCHAR2, 
    FromEmail IN VARCHAR2, FromName IN VARCHAR2,
    Priority IN INTEGER) IS
BEGIN
    UTL_SMTP.write_data(con, 'From: "'||FromName||'" <'||LOWER(FromEmail)||'>'||UTL_TCP.CRLF);
    UTL_SMTP.write_data(con, 'To: <'||LOWER(ToEmail)||'>'||UTL_TCP.CRLF);
    UTL_SMTP.write_data(con, 'Subject: '||Subject||UTL_TCP.CRLF);
    UTL_SMTP.write_data(con, 'X-Priority: '||Priority||UTL_TCP.CRLF);
END PutHeader;


PROCEDURE CloseMail(con IN OUT UTL_SMTP.connection) IS
BEGIN
    -- finish mail
    UTL_SMTP.close_data(con);
    UTL_SMTP.quit(con);
END CloseMail;

-- Append default footer at the end of mail
PROCEDURE PutFooter(con IN OUT UTL_SMTP.connection) IS
    sender VARCHAR2(1000);
BEGIN
    -- put footer to end of mail
    UTL_SMTP.write_data(con, UTL_TCP.CRLF || UTL_TCP.CRLF);
    sender := SYS_CONTEXT('USERENV', 'DB_NAME')||'.'||SYS_CONTEXT('USERENV', 'DB_DOMAIN');
    UTL_SMTP.write_data(con, 'Message from '||sender||' sent at '||TO_CHAR(LOCALTIMESTAMP, 'yyyy-mm-dd hh24:mi:ss'));   
    UTL_SMTP.write_data(con, UTL_TCP.CRLF);
END PutFooter;


-- Send Mail with CLOB attachment
PROCEDURE SendMail(
    Subject IN VARCHAR2, 
    Message IN VARCHAR2, 
    ToEmail IN VARCHAR2,
    Attachment IN CLOB, FilenameAttachment IN VARCHAR2,
    FromEmail IN VARCHAR2 DEFAULT DEFAULT_FROM_MAIL,
    FromName IN VARCHAR2 DEFAULT DEFAULT_FROM_NAME,
    Priority IN INTEGER DEFAULT PRIORITY_NORMAL) IS

    con UTL_SMTP.connection;

    AttachmentLength PLS_INTEGER;
    amount BINARY_INTEGER := 30000;
    BUFFER VARCHAR2(32000);
    offset PLS_INTEGER := 1;

BEGIN

    con := OpenConnection(ToEmail, FromEmail);
    PutHeader(con, Subject, ToEmail, FromEmail, FromName, Priority);

    UTL_SMTP.write_data(con, 'Mime-Version: 1.0' || UTL_TCP.CRLF);
    UTL_SMTP.write_data(con, 'Content-Type: '||MIME_MIXED||' boundary="'||MIME_BOUNDARY||'"' || UTL_TCP.CRLF);
    UTL_SMTP.write_data(con, '--'||MIME_BOUNDARY || UTL_TCP.CRLF); 
    UTL_SMTP.write_data(con, 'Content-type: text/plain' || UTL_TCP.CRLF); 

    -- Mail Body
    UTL_SMTP.write_data(con, UTL_TCP.CRLF);
    UTL_SMTP.write_raw_data(con, UTL_RAW.cast_to_raw(Message));
    UTL_SMTP.write_data(con, UTL_TCP.CRLF);
    PutFooter(con);

    -- Mail Attachment
    UTL_SMTP.write_data(con, UTL_TCP.CRLF);
    UTL_SMTP.write_data(con, '--'||MIME_BOUNDARY || UTL_TCP.CRLF);
    UTL_SMTP.write_data(con, 'Content-Type: '||MIME_TEXT||' name="'||FilenameAttachment||'"'|| UTL_TCP.CRLF);
    UTL_SMTP.write_data(con, 'Content-Disposition: attachment; filename="'||FilenameAttachment||'"'|| UTL_TCP.CRLF);
    UTL_SMTP.write_data(con, UTL_TCP.CRLF);

    AttachmentLength := DBMS_LOB.GETLENGTH(Attachment);
    LOOP
        EXIT WHEN offset > AttachmentLength;
        DBMS_LOB.READ(Attachment, amount, offset, BUFFER);
        UTL_SMTP.write_raw_data(con, UTL_RAW.cast_to_raw(BUFFER));
        offset := offset + amount;
    END LOOP;
    UTL_SMTP.write_data(con, UTL_TCP.CRLF);
    UTL_SMTP.write_data(con, '--'||MIME_BOUNDARY||'--' || UTL_TCP.CRLF);

    CloseMail(con);

END SendMail;



-- Send plain Mail without attachment
PROCEDURE SendMail(
    Subject IN VARCHAR2, 
    Message IN VARCHAR2, 
    ToEmail IN VARCHAR2,
    FromEmail IN VARCHAR2 DEFAULT DEFAULT_FROM_MAIL,
    FromName IN VARCHAR2 DEFAULT DEFAULT_FROM_NAME,
    Priority IN INTEGER DEFAULT PRIORITY_NORMAL) IS

    con UTL_SMTP.connection;

BEGIN

    con := OpenConnection(ToEmail, FromEmail);
    PutHeader(con, Subject, ToEmail, FromEmail, FromName, Priority);
    UTL_SMTP.write_data(con, 'Content-type: '||MIME_TEXT ||' charset='||GetCharset||UTL_TCP.CRLF );
    UTL_SMTP.write_data(con, UTL_TCP.CRLF);
    UTL_SMTP.write_raw_data(con, UTL_RAW.cast_to_raw(Message));
    UTL_SMTP.write_data(con, UTL_TCP.CRLF);
    PutFooter(con);
    CloseMail(con);

END SendMail;



END SENDMAIL_PKG;