Conversion of a delete using the context statement and policies MEV

Hello

I'm trying to convert a delete statement in an update statement using the context and political MEV.

+ / * Assumes that the "user1" user already exists. This is a user of the application * / +.

Conn User1/pwd

create table user1.test_a)
ID number 4,
Description varchar2 (100),
number (1) deleted
+);+

ALTER table user1.test_a add the primary key constraint test_a_pk (id);

insert into user1.test_a (1, 'abc', 0);
insert into user1.test_a (2, 'def', 0);
commit;

I would like to convert each physical deletion a logical removal: instructions such as "delete from user1.test_a where id = 1" must be converted to "day all deleted user1.test_a = 1 where id = 1".»

I found the following way: I create a policy to avoid the physical deletion. In addition, the political function should update the deletion indicator too.

Conn User1/pwd

+ / * Create package context * / +.
create or replace package user1.pkg_security_context is
p_set_ctx of the procedure)
i_test_a_id in % user1.test_a.id type
+);+
end;
+/+

create or replace package body is user1.pkg_security_context
procedure p_set_ctx)
i_test_a_id in % user1.test_a.id type
+) is +.
Start
DBMS_SESSION.set_Context ("user1_ctx", "test_a_id", i_test_a_id);
end;
end;
+/+
display errors

+ / * Create the trigger to put into context before deleting * / +.
create or replace trigger user1.test_a_bef_trg
before you delete the user1.test_a
for each line
declare
pragma autonomous_transaction;
Start
-does not validate the previous update, not deletion that fired the trigger.
commit;

User1.pkg_security_context.p_set_ctx (: old.id);
end;
+/+
display errors

user1_ctx context to create using user1.pkg_security_context;

+ / * Political * / +.
create or replace function user1.f_policy_chk_dels)
object_schema in varchar2,
object_name in varchar2
+) return varchar2 +.
is
out_string varchar2 (400) by default, 1 = 2 ';

+/*+
* out_string is the return value.
*-' WHERE 1 = 2' ' doesn't mean anything for access to.
*/
Start
If (loc_logged_usr_authorized > 0) then
+/*+
* Set the flag removed 1
*/
update of the game user1.test_a deleted = 1 where id = sys_context ('user1_ctx', 'test_a_id');

out_string: = out_string. 'or 1 = 1 ';
end if;

Return out_string.
end;
+/+
display errors

+/*+
Create policies
*/
Start
() dbms_rls.add_policy
object_schema = > 'user1 ',.
object_name = > "test_a"
POLICY_NAME = > "policy_chk_dels"
function_schema = > 'user1',-function scheme
policy_function = > 'f_policy_chk_dels', - function policy
statement_types = > 'DELETE '.
+);+
end;
+/+

When I try to delete a record from the table test_a:

Conn User1/pwd

SQL > delete sim ilogdia.oplsimulaciones where sim.id = 9999;

+ 0 rows deleted.

No row has been deleted, but the update stmt does not work. This means that the 'deleted' flag has not been updated.

Any ideas?

Thank you in advance.

Marco A. Serrano

Published by: albrotar on October 15, 2012 08:42

Published by: albrotar on October 15, 2012 08:42

Published by: albrotar on October 15, 2012 08:43

The policy function is applied once per execution of the statement. The political function executes first, and the UPDATE statement updates probably, no line because the context is not yet filled. The level of the line fills the frame (I'm assuming that your session may even see context values populated by autonomous transaction - I guess it's possible, but I have to test this) after the UPDATE statement is already complete. VALIDATION in the row-level trigger is also useless - it does that to changes made by the current transaction that is independent, of which there is none--it cannot apply to changes made in the other autonomous transactions. Declaring the level line trigger to use autonomous transactions does not seem to do anything other than to open the question of whether the values defined under the autonomous transaction are visible in the transactions of the appellant.

Even if, somehow, did not work, the use of transactions autonomous would be a very bad idea because Oracle is free to roll back a partially executed query (and the work done by its triggers) and re - run. Oracle does with some regularity to maintain the consistency of Scripture.

Justin

Tags: Database

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