[rzavitz]

I am trying to write an 'after insert' trigger for a very dynamic database that inserts all the new values put into a table into an audit table. To do this, I have to write :new.col1, :new.col2, :new.col3 etc into the audit table. I have a loop that puts ['col1','col2','col3', etc.] into a variable named column_name, but I don't seem to be able to dynamically generate the variable name. I guess I am looking for something like an eval function in PL/SQL that could do

stmt := 'new_value := :new.'||column_name;
eval(stmt);
insert into audit_table (:new.id,column_name,new_value,SYSDATE);

But I haven't found it yet, and I can't select column_name from table_name because table 'table_name' is mutating and Oracle won't let you select on a table that is changing. If anyone can help, it would be greatly appreciated. Thanks in advance.

[alligatorsql.com]

Hello,

I don´t know such a command in PL/SQL ... but what do you think about dynamic SQL. Use the package methods DMBS_SQL.

I hope this helps ?

Greetings
Manfred Peter
(Alligator Company)
http://www.alligatorsql.com

[rzavitz]

Hey, I can use dynamic SQL for something like the following

sql_stmt = 'select :col_name from :table_name where id=:id';
execute immediate into new_value using col_name, table_name, id

But this is an actual PL/SQL statement that I need to build on the fly like this

stmt := 'new_value=:new.'||col_name;
eval(stmt);
insert into audit_table values(:new.id,new_value,SYSDATE,col_name);

Any thoughts would be greatly appreciated. Thanks.

[alligatorsql.com]

Hello,

what´s about

DECLARE
cVar VARCHAR2(500) := 0;
BEGIN
cVar := 'DECLARE ' ||
' cThis VARCHAR2(200) := ''' ||
'BEGIN ' ||
' cThis := :new.' || column_name ||
' INSERT INTO and so on and so on ' ||
'END;';

.
.
.
do the dynamic stuff
.
.
.

END;

Is this what you want to do ?

Greetings
Manfred Peter
(Alligator Company)
http://www.alligatorsql.com