How to convert update,delete statement into select stmt

Question

Hi all,
     I have a field called dml_stmt, i am getting the dml statement has input from the user.
     My requirement is, if user is giving "update set col_name = 'xyz' from table_name where codition = 'aa'", before updating the table, i need to get old values from the table and put it in the audit table
     For that,i need to convert those update statement into select stmt and need to execute the query to get the data and then i will put it in the audit table..
     can anyone guide how to convert the update or delete stmt into select(need to write in pl/sql)
Please do needfull things ......
Regards,
Jame

Answer 1

Maybe I'm missing something, but why would auditing help here? It sounds like the user wants to know the prior values of the data, not the SQL UPDATE statement that was issued. Auditing would tell you that a table was updated, fine-grained auditing would tell you what the UPDATE statement was, but you'd need something else to capture the state of the data prior to the update.
Depending on why putting triggers on every table was discounted, you may also want to take a look at using Workspace Manager or Total Recall (in 11g) to track a history of data changes. But triggers would be the common solution to this sort of problem.
Justin