ASP.NET Web PDF Document Viewer/Editor Control Library

Enabling role(s) all Displaying enabled roles... CLERK_ROLE Enabling role(s) clerk_role Displaying enabled roles... CLERK_ROLE Enabling role(s) manager_role Exception in thread "main" java.sql.SQLException: ORA-01924: role 'MANAGER_ROLE' not granted or does not exist ORA-06512: at "SYS.DBMS_SESSION", line 124 ORA-06512: at line 1 :125) at trimmed to save space The main point to note is that this user can only enable clerk_role, as shown by the list of enabled roles immediately after we enabled all roles. This is also proven by the fact that we got an exception when we tried to set the role to manager_role. This is because this role was not granted to the end user db_clerk1. Let s see if we can enable manager_role if we do grant this role to db_clerk1, though: admin@ORA10G> grant manager_role, clerk_role to db_clerk1; Grant succeeded. Executing the program again gives us B:\code\book\ch16>java DemoProxyConnection db_clerk1 successfully connected... Displaying enabled roles... Enabling role(s) all Displaying enabled roles... CLERK_ROLE Enabling role(s) clerk_role Displaying enabled roles... CLERK_ROLE Enabling role(s) manager_role Exception in thread "main" java.sql.SQLException: ORA-01924: role 'MANAGER_ROLE' not granted or does not exist ORA-06512: at "SYS.DBMS_SESSION", line 124 ORA-06512: at line 1 at trimmed to save space We got a different exception this time. This exception tells us that the proxy user midtier cannot enable the role manager_role for the user db_clerk1. This is because, earlier on, we had restricted the universe of roles that can be enabled for db_clerk1 while using the proxy connection via midtier to the role clerk_role as follows: admin@ORA10G> alter user db_clerk1 grant connect through midtier with role clerk_role;

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Recommendation: Consider using option values for return types instead of raising exceptions. The .NET approach to exceptions is that they should be exceptional ; that is, they should occur relatively infrequently. However, some operations (for example, searching a table) may fail frequently. F# option values are an excellent way to represent the return types of these operations. Recommendation: Follow the .NET guidelines for value types. The .NET guidelines give good guidance about when to use .NET value types (that is, structs, which you saw introduced in 6). In particular, they recommend using a struct only when the following are all true: A type logically represents a single value similar to a primitive type. It has an instance size smaller than 16 bytes. It is immutable. It will not have to be boxed frequently (that is, converted to/from the type System.Object). Recommendation: Consider using explicit signature files for your framework. Explicit signature files were described in 7. Using explicit signatures files for framework code ensures that you know the full public surface of your API and can cleanly separate public documentation from internal implementation details. Recommendation: Consider avoiding the use of implementation inheritance for extensibility. Implementation inheritance is described in 6. In general, the .NET guidelines are quite agnostic with regard to the use of implementation inheritance. In F#, implementation inheritance is used more rarely than in other .NET languages. The main rationale for this has been given in 6, where you also saw many alternative techniques for designing and implementing object-oriented types using F#. However, implementation inheritance is used heavily in GUI frameworks.

Name STAT...buffer is not pinned co LATCH.session switching LATCH.ksuosstats global area STAT...session cursor cache co LATCH.sort extent pool STAT...sorts (memory) STAT...parse count (hard) STAT...active txn count during STAT...enqueue releases <- trimmed to conserve space -> STAT...table scan rows gotten STAT...no work - consistent re STAT...consistent gets from ca STAT...consistent gets STAT...session logical reads LATCH.cache buffers chains

Let s refactor the interdependent lists example to leverage some of the features of the client script manager. First you ll get the second list populated with the correct entries for the default selection in the first list by calling RegisterStartupScript (see ClientManagerIE.aspx in Web04 for the complete sample). this.ClientScript.RegisterStartupScript (this.GetType(), "PopList", "populateListB();", true); The first argument associates the registration with a specific type. This is designed to be used from custom controls, so each type can do its own registrations. Since you re writing page code, you ll pass an instance of the Type object associated with the Page type. The second argument is the name of the registration, which keeps it unique. The third argument is the code you want to execute, which matches the call you make from the onchange of list A. The fourth argument is a Boolean telling the rendering engine to wrap your function call in a script tag for you. Next let s break the static script (the part not being generated) out into a file named Interdepends.js. This includes nothing more than the populateListB method, and it allows the client to cache this script, reducing your page size. To include it on the page, you have only to call the new RegisterScriptInclude method:

Note Other object-oriented extensibility topics discussed in the .NET guidelines include events and callbacks, virtual members, abstract types and inheritance, and limiting extensibility by sealing classes.

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Recommendation: Use properties and methods for attributes and operations essential to a type. For example: type HardwareDevice with ... member ID: string member SupportedProtocols: seq<Protocol> Consider supporting using methods for the intrinsic operations essential to a type: type HashTable<'k,'v> with ... member Add : 'k * 'v -> unit member ContainsKey : 'k -> bool member ContainsValue : 'v -> bool