Quando uma trigger é disparada, pode-se retornar certos atributos sobre o evendo que causou o disparo. Cada atributo é retornado por uma função.

As funções, retiradas da documentação da Oracle. Confirmado que funciona na versão 9.2 e não funciona em algumas releases do 10g por causa de bugs (metalink.oracle.com para maiores detalhes)

Attribute Type Description Example
ora_client_ip_address
VARCHAR2

Returns the IP address of the client in a LOGON event, when the underlying protocol is TCP/IP

if (ora_sysevent = 'LOGON')
then addr :=
ora_client_ip_address;
end if;
ora_database_name
VARCHAR2(50)

Database name.

DECLARE
db_name VARCHAR2(50);
BEGIN
db_name := ora_database_name;
END;
ora_des_encrypted_password
VARCHAR2

The DES encrypted password of the user being created or altered.

IF (ora_dict_obj_type = 'USER')
THEN INSERT INTO event_table
(ora_des_encrypted_password);
END IF;
ora_dict_obj_name
VARCHAR(30)

Name of the dictionary object on which the DDL operation occurred.

INSERT INTO event_table
('Changed object is ' ||
ora_dict_obj_name');
ora_dict_obj_name_list
(name_list OUT
ora_name_list_t)
BINARY_INTEGER

Return the list of object names of objects being modified in the event.

if (ora_sysevent = 'ASSOCIATE
STATISTICS')
then number_modified :=
ora_dict_obj_name_list
(name_list);
end if;
ora_dict_obj_owner
VARCHAR(30)

Owner of the dictionary object on which the DDL operation occurred.

INSERT INTO event_table ('object
owner is' ||
ora_dict_obj_owner');
ora_dict_obj_owner_list(owne
r_list OUT ora_name_list_t)
BINARY_INTEGER

Returns the list of object owners of objects being modified in the event.

if (ora_sysevent = 'ASSOCIATE
STATISTICS')
then
number_of_modified_objects :=
ora_dict_obj_owner_list(owner_li
st);
end if;
ora_dict_obj_type
VARCHAR(20)

Type of the dictionary object on which the DDL operation occurred.

INSERT INTO event_table ('This
object is a ' ||
ora_dict_obj_type);
ora_grantee(
user_list
OUT ora_name_list_t)
BINARY_INTEGER

Returns the grantees of a grant event in the OUT parameter; returns the number of grantees in the return value.

if (ora_sysevent = 'GRANT') then
number_of_users :=
ora_grantee(user_list);
end if;
ora_instance_num
NUMBER

Instance number.

IF (ora_instance_num = 1)
THEN INSERT INTO event_table
('1');
END IF;
ora_is_alter_column(
column_name IN VARCHAR2)
BOOLEAN

Returns true if the specified column is altered.

if (ora_sysevent = 'ALTER' and
ora_dict_obj_type = 'TABLE')
then alter_column :=
ora_is_alter_column('FOO');
end if;
ora_is_creating_nested_table
BOOLEAN

Return TRUE if the current event is creating a nested table

if (ora_sysevent = 'CREATE' and
ora_dict_obj_type = 'TABLE' and
ora_is_creating_nested_table)
then insert into event_tab
values ('A nested table is
created');
end if;
ora_is_drop_column(
column_name IN VARCHAR2)
BOOLEAN

Returns true if the specified column is dropped.

if (ora_sysevent = 'ALTER' and
ora_dict_obj_type = 'TABLE')
then drop_column :=
ora_is_drop_column('FOO');
end if;
ora_is_servererror
BOOLEAN

Returns TRUE if given error is on error stack, FALSE otherwise.

IF
(ora_is_servererror(error_number
))
THEN INSERT INTO event_table
('Server error!!');
END IF;
ora_login_user
VARCHAR2(30)

Login user name.

SELECT ora_login_user
FROM dual;
ora_partition_pos
BINARY_INTEGER

In an INSTEAD OF trigger for CREATE TABLE, the position within the SQL text where you could insert a PARTITION clause.

-- Retrieve ora_sql_txt into
-- sql_text variable first.

n := ora_partition_pos;
new_stmt :=
substr(sql_text, 1, n-1) ||
' ' || my_partition_clause ||
' ' || substr(sql_text, n));
ora_privilege_list(
privilege_list OUT
ora_name_list_t)
BINARY_INTEGER

Returns the list of privileges being granted by the grantee or the list of privileges revoked from the revokee in the OUT parameter; returns the number of privileges in the return value.

if (ora_sysevent = 'GRANT' or
ora_sysevent = 'REVOKE')
then number_of_privileges :=
ora_privilege_list(priv_list);
end if;
ora_revokee (
user_list OUT
ora_name_list_t)
BINARY_INTEGER

Returns the revokees of a revoke event in the OUT parameter; returns the number of revokees in the return value..

if (ora_sysevent = 'REVOKE')
then
number_of_users :=
ora_revokee(user_list);
ora_server_error
NUMBER

Given a position (1 for top of stack), it returns the error number at that position on error stack

INSERT INTO event_table ('top
stack error ' ||
ora_server_error(1));
ora_server_error_depth
BINARY_INTEGER

Returns the total number of error messages on the error stack.

n := ora_server_error_depth;
-- This value is used with
-- other functions such as
-- ora_server_error
ora_server_error_msg
(position in binary_integer)
VARCHAR2

Given a position (1 for top of stack), it returns the error message at that position on error stack

INSERT INTO event_table ('top
stack error message' ||
ora_server_error_msg(1));

ora_server_error_num_params
(position in binary_integer)
BINARY_INTEGER

Given a position (1 for top of stack), it returns the number of strings that have been substituted into the error message using a format like "%s".

n :=
ora_server_error_num_params(1);
ora_server_error_param
(position in binary_integer,
param in binary_integer)
VARCHAR2

Given a position (1 for top of stack) and a parameter number, returns the matching “%s”, “%d”, and so on substitution value in the error message.

-- E.g. the 2rd %s in a message
-- like "Expected %s, found %s"
param :=
ora_server_error_param(1,2);
ora_sql_txt (sql_text out
ora_name_list_t)
BINARY_INTEGER

Returns the SQL text of the triggering statement in the OUT parameter. If the statement is long, it is broken up into multiple PL/SQL table elements. The function return value specifies how many elements are in the PL/SQL table.

sql_text ora_name_list_t;
stmt VARCHAR2(2000);
...
n := ora_sql_txt(sql_text);
FOR i IN 1..n LOOP
stmt := stmt || sql_text(i);
END LOOP;
INSERT INTO event_table ('text
of triggering statement: ' ||
stmt);
ora_sysevent
VARCHAR2(20)

System event firing the trigger: Event name is same as that in the syntax.

INSERT INTO event_table
(ora_sysevent);
ora_with_grant_option
BOOLEAN

Returns true if the privileges are granted with grant option.

if (ora_sysevent = 'GRANT' and
ora_with_grant_option = TRUE)
then insert into event_table
('with grant option');
end if;
space_error_info(
error_number OUT NUMBER,
error_type OUT VARCHAR2,
object_owner OUT VARCHAR2,
table_space_name OUT
VARCHAR2,
object_name OUT VARCHAR2,
sub_object_name OUT
VARCHAR2)
BOOLEAN

Returns true if the error is related to an out-of-space condition, and fills in the OUT parameters with information about the object that caused the error.

if (space_error_info(eno, typ,
owner, ts, obj, subobj) = TRUE)
then
dbms_output.put_line('The
object ' || obj || ' owned by '
|| owner || ' has run out of
space.');
end if;