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PASOS PARA IMPLEMENTAR UNA 
VPD
1) Crear un paquete PL/SQL para ajustar al contexto. 
CREATE OR REPLACE PACKAGE orders_ctx_pkg IS 
PROCEDURE set_custnum; 
END; 
/ 
CREATE OR REPLACE PACKAGE BODY orders_ctx_pkg IS 
PROCEDURE set_custnum 
AS 
custnum NUMBER; 
WHERE cust_email = SYS_CONTEXT( ' USERENV ' , ' SESSION_USER '); 
SELECT cust_no INTO custnum FROM scott.customers 
END; 
/ 
1) CREAR UN PAQUETE PL/SQL 
PARA AJUSTAR AL CONTEXTO.
2) CREAR UN CONTEXTO 
DE LA APLICACIÓN. 
CREATE OR REPLACE CONTEXT orders_ctx USING 
orders_cxt_pkg;
3) CREAR UN INICIO DE SESIÓN DE 
ACTIVACIÓN PARA EJECUTAR E 
CONTEXTO DE APLICACIÓN PL/SQL 
CREATE TRIGGER set_custno_ctx_trig AFTER LOGON ON 
DATABASE 
BEGIN 
sysadmin_vpd.orders_ctx_pkg.set_custnum; 
END; 
/
4) CREAR LA FUNCIÓN PL/SQL 
QUE GENERA EL PREDICADO. 
CREATE OR REPPLACE FUNCTION get_user_orders( 
schema_p IN VARCHAR2, 
table_p IN VARCHAR2) 
RETURN VARCHAR2 
AS 
orders_pred VARCHAR2 (400); 
BEGIN 
orders_pred := ' cust_no = SYS_CONTEXT(' ' orders_ctx' ', ' 
'cust_no' ') '; 
RETURN orders_pred; 
END; 
/
BEGIN 
DBMS_RLS.ADD_POLICY ( 
object_schema => 'scott', 
object_name => 'orders_tab', 
policy_name => 'orders_policy', 
function_schema => 'sysadmin_vpd', 
policy_function => 'get_user_orders', 
statement_types => 'select'); 
END; 
/ 
5) CREAR LA POLÍTICA PARA ASOCIAR 
A LA FUNCIÓN DE LA TABLA.

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Pasos para implementar una vpd

  • 2. 1) Crear un paquete PL/SQL para ajustar al contexto. CREATE OR REPLACE PACKAGE orders_ctx_pkg IS PROCEDURE set_custnum; END; / CREATE OR REPLACE PACKAGE BODY orders_ctx_pkg IS PROCEDURE set_custnum AS custnum NUMBER; WHERE cust_email = SYS_CONTEXT( ' USERENV ' , ' SESSION_USER '); SELECT cust_no INTO custnum FROM scott.customers END; / 1) CREAR UN PAQUETE PL/SQL PARA AJUSTAR AL CONTEXTO.
  • 3. 2) CREAR UN CONTEXTO DE LA APLICACIÓN. CREATE OR REPLACE CONTEXT orders_ctx USING orders_cxt_pkg;
  • 4. 3) CREAR UN INICIO DE SESIÓN DE ACTIVACIÓN PARA EJECUTAR E CONTEXTO DE APLICACIÓN PL/SQL CREATE TRIGGER set_custno_ctx_trig AFTER LOGON ON DATABASE BEGIN sysadmin_vpd.orders_ctx_pkg.set_custnum; END; /
  • 5. 4) CREAR LA FUNCIÓN PL/SQL QUE GENERA EL PREDICADO. CREATE OR REPPLACE FUNCTION get_user_orders( schema_p IN VARCHAR2, table_p IN VARCHAR2) RETURN VARCHAR2 AS orders_pred VARCHAR2 (400); BEGIN orders_pred := ' cust_no = SYS_CONTEXT(' ' orders_ctx' ', ' 'cust_no' ') '; RETURN orders_pred; END; /
  • 6. BEGIN DBMS_RLS.ADD_POLICY ( object_schema => 'scott', object_name => 'orders_tab', policy_name => 'orders_policy', function_schema => 'sysadmin_vpd', policy_function => 'get_user_orders', statement_types => 'select'); END; / 5) CREAR LA POLÍTICA PARA ASOCIAR A LA FUNCIÓN DE LA TABLA.