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First, we will create the hr_security package, which we will use later to access the application context. This package is the key to row-level security, since it generates the dynamic-access predicates for a table. Listing 12-13 shows how to create the hr_security package. Listing 12-13. Creating the hr_security Package SQL> CREATE OR REPLACE PACKAGE hr_security AS 2 FUNCTION empnum_sec (A1 VARCHAR2, A2 VARCHAR2) 3 RETURN varchar2; 4 END; 5*/ Package created. SQL> CREATE OR REPLACE PACKAGE BODY hr_security AS 2 FUNCTION empnum_sec (A1 VARCHAR2, A2 VARCHAR2) 3 RETURN varchar2 4 IS 5 d_predicate varchar2 (2000); 6 BEGIN 7 d_predicate:= 'employee_id = 8 SYS_CONTEXT("EMPLOYEE_INFO","EMP_NUM")'; 9 RETURN d_predicate; 10 END empnum_sec; 11 END hr_security; 12* / Package body created. SQL> The package created in Listing 12-13, hr_security, will use the employee_info context (created earlier in the Creating the Application Context section) to get the emp_num variable. As you recall from the previous section, the employee_info application context gets the emp_num variable from the USERENV namespace (the SESSION_USER attribute of the USERENV namespace). The d_predicate predicate in the hr_security package indicates the transformation that should be applied to any queries made by any employee whose employee_id matches the emp_num variable obtained from the employee_info context. For example, if user salapati issues the following command: SQL> SELECT * FROM employees; it will be modified by our predicate (d_predicate) as follows: SQL> SELECT * FROM employees 2* WHERE employee_id = SYS_CONTEXT ('EMPLOYEE_INFO', 'EMP_NUM');

The hr_security package created in the previous section lets you attach a dynamic predicate (WHERE employee_id = SYS_CONTEXT ('EMPLOYEE_INFO', 'EMP_NUM')) to any SQL statements that can be used by employees whose employee_id matches the emp_num derived by using the employee_info application context. But we still haven t attached a security policy to the employees table. That is, we now have to specify what kinds of SQL statements, and precisely what tables, the hr_security package would be applied to. In previous releases of the Oracle database, all security polices were dynamic, meaning the database had to execute the policy function for each DML statement. Of course, repeated execution of the policy functions costs system resources and could hurt performance in a busy OLTP database. Oracle now offers several choices regarding the type of policy you can use. You can specify the

following five types of security policies by using the POLICY_TYPE parameter of the DBMS_RLSADD_ POLICY procedure: Dynamic: Each time a statement is parsed or executed, the security policy function is executed afresh This is the default policy type, and you can specify it either by setting the POLICY_TYPE parameter to DBMS_RLSDYNAMIC or by just leaving the parameter out altogether Static: This type of policy function needs to be executed only once, when a user first accesses a database object Thereafter, the value of the policy function is cached in the SGA, and all users accessing the object will get the same predicate You can choose this type by setting the POLICY_TYPE parameter to DBMS_RLSSTATIC.

Set(ByVal Value As String) _style = Value End Set End Property Private _color As String Public Property Color() As String Get Return _color End Get Set(ByVal Value As String) _color = Value End Set End Property Private _options As PricedItem() Public Property Options() As PricedItem() Get Return _options End Get Set(ByVal Value As PricedItem()) _options = Value End Set End Property Private _id As String Public Property Id() As String Get Return _id End Get Set(ByVal Value As String) _id = Value End Set End Property ' public default constructor is required in serializable classes Public Sub New() End Sub Public Sub New(ByVal theModel As String, _ ByVal theStyle As String, _ ByVal theColor As System.Drawing.Color, _ ByVal theOptions As PricedItem()) _model = theModel _style = theStyle _color = theColor.Name _options = theOptions _id = Guid.NewGuid().ToString() End Sub End Class