.NET/ASP.NET/C#/VB.NET PDF Document SDK

Used by the resource manager to retrieve resources from assemblies with a dedicated handler (see the MSDN SDK docs for details). Allows you to add a hidden input to your form simply by providing a name and a value. Rendering generates the input element for you. An easy way to interject some client-side code that will execute before a postback occurs. A very common example of this is when you have a delete button on a page, and want to verify with the user that he s serious before doing a round trip to the server. Places code inline within a script block yet outside of a function so it executes as soon as the browser loads the page. Similiar to adding code to the onload event of the body element. Checks to see if a named script block has already been registered using RegisterClientScriptBlock. Checks to see if a named script include has already been registered using RegisterClientScriptInclude. Checks to see if a named script block has already been registered using RegisterOnSubmitStatement Checks to see if a named script block has already been registered using RegisterStartupScript.

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We first display roles that are enabled by default: System.out.println( "successfully connected..."); _displayEnabledRoles( conn ); Next, we invoke _enableRole() with the role all to enable all roles granted to the end user. We invoke _displayEnabledRoles() to verify the enabled roles. _enableRole( conn, "all" ); _displayEnabledRoles( conn ); We invoke _enableRole() with the roles clerk_role and manager_role, displaying enabled roles each time. The main() method ends with a finally clause that closes our connection object: _enableRole( conn, "clerk_role" ); _displayEnabledRoles( conn ); _enableRole( conn, "manager_role" ); _displayEnabledRoles( conn ); } finally { JDBCUtil.close ( conn ); } }// end of main The method _displayEnabledRoles() simply selects all enabled roles for a session from the view session_roles and prints them out: // display enabled roles private static void _displayEnabledRoles( Connection conn ) throws SQLException { System.out.println( "Displaying enabled roles..."); PreparedStatement pstmt = null; ResultSet rset = null; try { pstmt = conn.prepareStatement( "select role from session_roles"); rset = pstmt.executeQuery(); while( rset.next() ) { System.out.println( "\t" + rset.getString( 1 ) ); } } finally { JDBCUtil.close( rset ); JDBCUtil.close( pstmt ); } }

exceptions, wrapping exceptions, choosing exception messages, and special exceptions to avoid throwing (that is, OutOfMemoryException, ExecutionEngineException, COMException, SEHException, StackOverflowException, NullReferenceException, AccessViolationException, or InvalidCastException).

The method _enableRole() enables a given set of roles by invoking the method set_role() of the supplied package dbms_session: // enable a given role or a set of comma-separated roles. private static void _enableRole( Connection conn, String role ) throws SQLException { System.out.println( "Enabling role(s) " + role ); CallableStatement cstmt = null; try { cstmt = conn.prepareCall( "{call dbms_session.set_role( ) }" ); cstmt.setString( 1, role ); cstmt.execute(); } finally { JDBCUtil.close( cstmt ); } } }// end of program Note again that in our program we didn t supply the password for the end user that we will log in as. Let s first see what the output of the program is when we run it with the parameter db_manager1: B:\>java DemoProxyConnection db_manager1 successfully connected... Displaying enabled roles... Enabling role(s) all Displaying enabled roles... MANAGER_ROLE CLERK_ROLE Enabling role(s) clerk_role Displaying enabled roles... CLERK_ROLE Enabling role(s) manager_role Displaying enabled roles... MANAGER_ROLE Note that the first time we didn t have any roles enabled by default. When we enabled all roles, the enabled roles were clerk_role and manager_role. This showed us the set of roles that this user can enable. Then we enabled the roles clerk_role and manager_role individually (by replacing the keyword all in the set role command), as shown by the output. Let s now see what the program output is if we invoke the program to proxy for the user db_clerk1: B:\>java DemoProxyConnection db_clerk1 successfully connected... Displaying enabled roles...

IsClientScriptBlockRegistered IsClientScriptIncludeRegistered IsOnSubmitStatementRegistered IsStartupScriptRegistered