como exportar dados da tabela de log para o corpo do email no oracle

Para qualquer mails do Oracle eu uso este procedimento genérico no pacote PL/SQL:

CREATE OR REPLACE TYPE VARCHAR_TABLE_TYPE AS TABLE OF VARCHAR2(1000);
/

CREATE OR REPLACE PACKAGE Mailing AS

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

PROCEDURE SendMail(
    Subject IN VARCHAR2, 
    Message IN OUT CLOB, 
    ToMail IN VARCHAR_TABLE_TYPE,   
    FromMail IN VARCHAR2, FromName IN VARCHAR2,
    PRIORITY IN INTEGER DEFAULT PRIORITY_NORMAL,
    FileName IN VARCHAR2 DEFAULT NULL, 
    MimeType IN VARCHAR2 DEFAULT NULL, --> determines the MIME-Type of binary attachment "BinAttachment"
    TxtAttachment IN CLOB DEFAULT NULL, 
    BinAttachment IN BLOB DEFAULT NULL);


END Mailing;
/

CREATE OR REPLACE PACKAGE BODY Mailing AS

PROCEDURE SendMail(
    Subject IN VARCHAR2, 
    Message IN OUT CLOB, 
    ToMail IN VARCHAR_TABLE_TYPE,   
    FromMail IN VARCHAR2, FromName IN VARCHAR2,
    PRIORITY IN T_MAIL_PRIORITY DEFAULT PRIORITY_NORMAL,
    FileName IN VARCHAR2 DEFAULT NULL, 
    MimeType IN VARCHAR2 DEFAULT NULL,
    TxtAttachment IN CLOB DEFAULT NULL, 
    BinAttachment IN BLOB DEFAULT NULL) IS

    SMTP_PORT               CONSTANT INTEGER := 25;
    SMTP_SERVER             CONSTANT VARCHAR2(50):= 'mailhost';
    MIME_BOUNDARY           CONSTANT VARCHAR2(50) := '====Multipart.Boundary.689464861147414354====';

    con UTL_SMTP.CONNECTION;
    ret UTL_SMTP.REPLY;
    Charset VARCHAR2(20);
    Footer VARCHAR2(1000);
    Recipients VARCHAR2(1000);

    LobLen INTEGER;
    amount INTEGER := 8000;
    BUFFER VARCHAR2(32000);
    BUFFER_B RAW(48);
    OFFSET INTEGER := 1;
    isHTML BOOLEAN := REGEXP_LIKE(DBMS_LOB.SUBSTR(Message, 1000, 1), '(< *html)|(< *body)', 'i');

BEGIN

    SELECT UTL_I18N.MAP_CHARSET(VALUE)
    INTO Charset
    FROM NLS_DATABASE_PARAMETERS
    WHERE parameter = 'NLS_CHARACTERSET';

    -- Append common footer to mail 
    Footer := 'Message from '||SYS_CONTEXT('USERENV', 'DB_NAME')||' sent at '||TO_CHAR(SYSDATE,'yyyy-mm-dd hh24:mi:ss');
    IF isHTML THEN
        Message := REPLACE(message, '</body>', '<p>'||Footer||'</p></body>');
    END IF;

    -- setup mail header
    con := UTL_SMTP.OPEN_CONNECTION(SMTP_SERVER, SMTP_PORT);
    ret := UTL_SMTP.HELO(con, SYS_CONTEXT('USERENV', 'DB_DOMAIN'));
    ret := UTL_SMTP.MAIL(con, FromMail);
    FOR i IN ToMail.FIRST..ToMail.LAST LOOP
        Recipients := Recipients ||ToMail(i)||',';
        ret := UTL_SMTP.RCPT(con, ToMail(i));
    END LOOP;
    ret := UTL_SMTP.OPEN_DATA(con);

    IF CONVERT(FromName, 'US7ASCII') = FromName THEN
        UTL_SMTP.WRITE_DATA(con, 'From: "'||FromName||'" <'||FromMail||'>'||UTL_TCP.CRLF);
    ELSE
        UTL_SMTP.WRITE_DATA(con, 'From: =?UTF-8?B?'|| UTL_ENCODE.TEXT_ENCODE(FromName, 'AL32UTF8', UTL_ENCODE.BASE64) ||'?= <'||FromMail||'>'||UTL_TCP.CRLF);
    END IF; 
    UTL_SMTP.WRITE_DATA(con, 'To: '||REGEXP_REPLACE(Recipients, ',$')||UTL_TCP.CRLF);
    IF CONVERT(Subject, 'US7ASCII') = Subject THEN
        UTL_SMTP.WRITE_DATA(con, 'Subject: '||Subject||UTL_TCP.CRLF);
    ELSE
        UTL_SMTP.WRITE_DATA(con, 'Subject: =?UTF-8?B?'|| REPLACE(REPLACE(UTL_ENCODE.TEXT_ENCODE(Subject, 'AL32UTF8', UTL_ENCODE.BASE64), CHR(13), NULL), CHR(10), NULL) ||'?='||UTL_TCP.CRLF);
    END IF;
    UTL_SMTP.WRITE_DATA(con, 'Date: '||TO_CHAR(CURRENT_TIMESTAMP, 'Dy, DD Mon YYYY hh24:mi:ss TZHTZM', 'NLS_DATE_LANGUAGE = American')||UTL_TCP.CRLF);  
    UTL_SMTP.WRITE_DATA(con, 'X-Priority: '||PRIORITY||UTL_TCP.CRLF);
    UTL_SMTP.WRITE_DATA(con, 'MIME-Version: 1.0' || UTL_TCP.CRLF);

    IF FileName IS NOT NULL THEN
        UTL_SMTP.WRITE_DATA(con, 'Content-Type: multipart/mixed; boundary="'||MIME_BOUNDARY||'"' || UTL_TCP.CRLF);
        UTL_SMTP.WRITE_DATA(con, 'Content-Disposition: inline'|| UTL_TCP.CRLF);
        UTL_SMTP.WRITE_DATA(con, UTL_TCP.CRLF);
        UTL_SMTP.WRITE_DATA(con, '--'||MIME_BOUNDARY || UTL_TCP.CRLF);
    END IF;

    IF isHTML THEN
        UTL_SMTP.WRITE_DATA(con, 'Content-Type: text/html; charset='||Charset || UTL_TCP.CRLF);
    ELSE 
        UTL_SMTP.WRITE_DATA(con, 'Content-Type: text/plain; charset='||Charset || UTL_TCP.CRLF);
    END IF;
    UTL_SMTP.WRITE_DATA(con, 'Content-Disposition: inline'|| UTL_TCP.CRLF);


    -- Mail Body
    UTL_SMTP.WRITE_DATA(con, UTL_TCP.CRLF);
    LobLen := DBMS_LOB.GETLENGTH(Message);
    LOOP
        EXIT WHEN OFFSET > LobLen;
        DBMS_LOB.READ(Message, 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);
    IF NOT isHTML THEN
        UTL_SMTP.WRITE_DATA(con, UTL_TCP.CRLF || UTL_TCP.CRLF);
        UTL_SMTP.WRITE_DATA(con, Footer);
        UTL_SMTP.WRITE_DATA(con, UTL_TCP.CRLF);
    END IF;

    IF FileName IS NOT NULL THEN
        -- Mail Attachment
        UTL_SMTP.WRITE_DATA(con, UTL_TCP.CRLF);
        UTL_SMTP.WRITE_DATA(con, '--'||MIME_BOUNDARY || UTL_TCP.CRLF);

        OFFSET := 1;
        IF TxtAttachment IS NOT NULL THEN
            UTL_SMTP.WRITE_DATA(con, 'Content-Type: text/plain; charset='||Charset|| UTL_TCP.CRLF);
            UTL_SMTP.WRITE_DATA(con, 'Content-Disposition: attachment; filename="'||Filename||'"'|| UTL_TCP.CRLF);
            UTL_SMTP.WRITE_DATA(con, UTL_TCP.CRLF);                         
            LobLen := DBMS_LOB.GETLENGTH(TxtAttachment);
            LOOP
                EXIT WHEN OFFSET > LobLen;
                DBMS_LOB.READ(TxtAttachment, amount, OFFSET, BUFFER);
                UTL_SMTP.WRITE_RAW_DATA(con, UTL_RAW.CAST_TO_RAW(BUFFER));
                OFFSET := OFFSET + amount;
            END LOOP;
        ELSIF BinAttachment IS NOT NULL THEN
            UTL_SMTP.WRITE_DATA(con, 'Content-Type: '||MimeType||'; name="'||Filename||'"'|| UTL_TCP.CRLF);
            UTL_SMTP.WRITE_DATA(con, 'Content-Disposition: attachment; filename="'||Filename||'"'|| UTL_TCP.CRLF);
            UTL_SMTP.write_data(con, 'Content-Transfer-Encoding: base64' || UTL_TCP.crlf);
            UTL_SMTP.WRITE_DATA(con, UTL_TCP.CRLF);            
            amount := 48; -- must be a whole multiple of 3
            LobLen := DBMS_LOB.GETLENGTH(BinAttachment);
            LOOP
                EXIT WHEN OFFSET > LobLen;
                DBMS_LOB.READ(BinAttachment, amount, OFFSET, BUFFER_B);
                UTL_SMTP.WRITE_RAW_DATA(con, UTL_ENCODE.BASE64_ENCODE(BUFFER_B));
                OFFSET := OFFSET + amount;
            END LOOP;       
        END IF;
        UTL_SMTP.WRITE_DATA(con, UTL_TCP.CRLF);
        UTL_SMTP.WRITE_DATA(con, '--'||MIME_BOUNDARY||'--' || UTL_TCP.CRLF);
    END IF;

    -- finish mail
    ret := UTL_SMTP.CLOSE_DATA(con);
    ret := UTL_SMTP.QUIT(con);

EXCEPTION
    WHEN UTL_SMTP.TRANSIENT_ERROR OR UTL_SMTP.PERMANENT_ERROR THEN
        UTL_SMTP.QUIT(con);
END SendMail;

END Mailing;
/

Oferece alguns extras:

Opcionalmente, você pode anexar um arquivo (txt ou binário, mas apenas um arquivo é compatível)
From e Subject pode conter caracteres não ASCII como öäü (é claro que o corpo do e-mail também pode)
Vários destinatários
Usar automaticamente o conjunto de caracteres correto do banco de dados
Deteta automaticamente o corpo do e-mail em texto simples ou HTML
Rodapé comum para indicar e-mail

Observe, não perca as linhas vazias UTL_SMTP.WRITE_DATA(con, UTL_TCP.CRLF); , eles são necessários para o correio adequado.

Então você pode usar o procedimento por exemplo assim:

DECLARE
    Message CLOB;
BEGIN

    FOR aMsg IN (SELECT Log_id, Procedure_name, Fail_type, Message FROM log_messages ORDER BY Log_id) LOOP
        Message := Message || aMsg.Log_id ||' - '|| aMsg.Procedure_name ||' - '|| aMsg.Fail_type ||' - '|| aMsg.Message || CHR(13);
    end loop;

    SendMail(
        Subject => 'You got some logs', 
        Message => Message, 
        ToMail => VARCHAR_TABLE_TYPE('[email protected]'),   
        FromMail => '[email protected]', 
        FromName => 'Oracle User: '||USER);
END;

ou você pode colocar logs como anexo assim:

DECLARE
    Message CLOB;
    Attachment CLOB;
BEGIN
    Message := 'Open attachment to see log file';
    FOR aMsg IN (SELECT Log_id, Procedure_name, Fail_type, Message FROM log_messages ORDER BY Log_id) LOOP
        Attachment := Attachment || aMsg.Log_id ||' - '|| aMsg.Procedure_name ||' - '|| aMsg.Fail_type ||' - '|| aMsg.Message || CHR(13);
    end loop;

    Mailing.SendMail(
        Subject => 'You got some logs', 
        Message => Message, 
        ToMail => VARCHAR_TABLE_TYPE('[email protected]'),   
        FromMail => '[email protected]', 
        FromName => 'Oracle User: '||USER,
        TxtAttachment => Attachment,
        FileName => 'logfile.txt');
END;