Simple .NET/ASP.NET PDF document editor web control SDK

First, we create manager_role and grant it privileges to execute both the manager_pkg and clerk_pkg packages after connecting as admin. db_data_access_layer@ORA10G> connect admin/admin Connected. admin@ORA10G> -- create manager_role admin@ORA10G> create role manager_role; Role created. admin@ORA10G> grant execute on manager_pkg to manager_role; Grant succeeded. admin@ORA10G> grant execute on clerk_pkg to manager_role; Grant succeeded. Next, we create clerk_role with the privilege of executing only the package clerk_pkg: admin@ORA10G> create role clerk_role; Role created. admin@ORA10G> grant execute on clerk_pkg to clerk_role; Grant succeeded. Finally, it is time to create the database users that correspond to end users of the application in our database. We will create two representative end users. The end user manager1 maps to the database schema db_manager1, which has the roles manager_role and clerk_role. The end user clerk1 maps to the database schema db_clerk1, which is granted only the role clerk_role. Each of these two database users also gets the create session privilege required to log into the database. In a real-life application, we would, of course, have many end users getting mapped to various database roles based on the business functions they perform. admin@ORA10G> create user db_manager1 identified by db_manager1; User created. admin@ORA10G> grant create session to db_manager1; Grant succeeded. admin@ORA10G> grant manager_role, clerk_role to db_manager1; Grant succeeded. admin@ORA10G> create user db_clerk1 identified by db_clerk1; User created. admin@ORA10G> grant create session to db_clerk1; Grant succeeded. admin@ORA10G> grant clerk_role to db_clerk1; Grant succeeded. Now, for example, if we try to access the package manager_pkg while connected as db_clerk1, we will get an error because the corresponding access does not exist: db_clerk1@ORA10G> desc manager_pkg ERROR: ORA-04043: object "DB_DATA_ACCESS_LAYER"."MANAGER_PKG" does not exist

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1 Deciding what values you re interested in representing These values may range from simple integers to more sophisticated objects such expression trees from 9 or the asynchronous tasks from 13 2 Deciding what operations are required to build these values, extracting information from them, and combining them and transforming them 3 Deciding what equations and other algebraic properties should hold between these values and assessing whether these properties hold the implementation Steps 1 and 2 explain why functional programmers often prefer to define operations separately from types As a result, functional programmers often find object-oriented programming strange because it emphasizes operations on single values, while functional programming emphasizes operations that combine values This carries over to library implementation in functional programming, where you will often see types defined first and then modules containing operations on those types.

<BR><BR> <SELECT NAME="ddlListB" onchange='alert(documentForm1ddlListBvalue);'> </body> </html> This presents two drop-down lists The choices in the second list are determined by what s selected in the first list You do this with simple JavaScript arrays For now, the second list simply displays the underlying value of the option tag when it s selected You re going to transform this static piece of code into a dynamically generated script function It may not seem static, but it is to the server As far as the server is concerned, this is flat text It has no life until it gets to the client Starting with a working set of client code makes it easier to add the abstractions necessary to dynamically generate it on the server For each step, you ll take a piece of the previous HTML document and transform it into server-side code that generates it.

However, the same user can access the package clerk_pkg: db_clerk1@ORA10G> desc clerk_pkg FUNCTION LIST_DEPT_DETAILS RETURNS REF CURSOR Argument Name Type ------------------------------ ----------------------P_DEPT_NO NUMBER FUNCTION LIST_EMP_DETAILS RETURNS REF CURSOR Argument Name Type ------------------------------ ----------------------P_EMPNO NUMBER

Because of this, one pattern that is quite common in the F# library is the following: The type is defined first Then there is a module that defines the functions to work over the type Finally, there is a with augmentation that adds the most common functions as members We described augmentations in 6 One simple example of functional programming methodology in this book is in 12, where you saw how a representation for propositional logic is defined using a type: type Var = string type Prop = | And of Prop * Prop | Var of Var | Not of Prop | Exists of Var * Prop | False Operations were then defined to combine and analyze values of type Prop It would not make sense to define all of these operations as intrinsic to the Prop type, an approach often taken in OO design.

Now that we have gone through the process of creating all the schema objects required, we will use this sample application for demonstration purposes in the remainder of this chapter. In the next section, we will cover some of the challenges while authenticating an application end user to the database.