.NET/Java PDF, Tiff, Barcode SDK Library

Definer rights mode is the default mode of creating a procedure. In this mode, Oracle uses the security privileges and object name resolution of the definer (or the owner) of a PL/SQL procedure during compilation and execution of your PL/SQL procedure. Under definer rights mode, PL/SQL procedures compile and run with directly granted privileges only. This means that any privileges granted to the procedure owner via a role are not available. In other words, all roles are disabled when you compile and execute a procedure that is created with definer rights mode. Invoker rights mode is the nondefault mode of creating a procedure. In this mode, at compilation time things work as in the case of procedures created in definer rights mode. However, during execution time, the database uses the privileges and object resolution of the invoker of the procedure. You may be a little confused at this point, especially if this is the first time you have encountered these definitions. The code example in this section should clarify these concepts for you. In our code example, we will create three users: db_app_data: This user will contain a table, t1, along with a public synonym. definer: This user will demonstrate definer rights concepts. invoker: This user will demonstrate invoker rights concepts. We begin by connecting as sys, creating the db_app_data user, and granting the appropriate privileges: sys@ORA10G> create user db_app_data identified by db_app_data default tablespace users quota 2 unlimited on users; User created. sys@ORA10G> grant create session, 2 create table, 3 create public synonym, 4 drop public synonym 5 to db_app_data; Grant succeeded. We then connect as db_app_data and create table t1, inserting the numbers 1 to 5 in it: sys@ORA10G> conn db_app_data/db_app_data Connected. db_app_data@ORA10G> create table t1 ( x number );

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But there may be key features of your application that you can move into configuration, or you can create an administrative applet to tweak, or for which a vendorsupplied solution nicely fits the bill The other type of change anticipation involves minimizing how many components of a system will be affected when the inevitable change is requested Even if the anticipated change does require developer involvement, isolating that change from other functional areas of the system minimizes the number of binaries affected and, therefore, the complexity of the regression testing that must be done This may be a choice as simple as making some set of functionality interface based, so that a developer can create new implementations of the interface, and the production system can use late-binding and Reflection to pick up and execute an assembly with the new implementation.

Some of the other important mutable data structures in the F# and .NET libraries are as follows: System.Collections.Generic.SortedList<'key,'value>: A collection of sorted values. Searches are done by a binary search. The underlying data structure is a single array. System.Collections.Generic.SortedDictionary<'key,'value>: A collection of key/value pairs sorted by the key, rather than hashed. Searches are done by a binary chop. The underlying data structure is a single array. System.Collections.Generic.Stack<'a>: A variable-sized last-in/first-out (LIFO) collection. System.Collections.Generic.Queue<'a>: A variable-sized first-in/first-out (FIFO) collection. System.Text.StringBuilder: A mutable structure for building string values. Microsoft.FSharp.Collections.HashSet<'key>: A hash table structure holding only keys and no values. From .NET 3.5, a HashSet<'a> type is available in the System.Collections. Generic namespace.

Table created. db_app_data@ORA10G> insert into t1 select rownum from all_objects where rownum <= 5; 5 rows created. Next, we create a public synonym for this table: db_app_data@ORA10G> create public synonym t1 for t1; Synonym created. Connecting back as sys, we create a role called demo_role with the select privilege on table t1. We will use this role to demonstrate how roles are disabled for a definer rights procedure. sys@ORA10G> create role demo_role; Role created. sys@ORA10G> grant select on t1 to demo_role; Grant succeeded. We now create a user called definer and grant this user the appropriate privileges: sys@ORA10G> create user definer identified by definer default tablespace users quota 2 unlimited on users; User created. sys@ORA10G> grant create session, 2 create table, 3 create procedure 4 to definer; Grant succeeded. We also grant demo_role (which has the select privilege on t1) to the user definer: sys@ORA10G> grant demo_role to definer; Grant succeeded. Let s summarize what we ve done so far. We created a user, db_app_data, that owns a table, t1. Table t1 has a public synonym called t1. We have a role called demo_role, which has the select privilege on t1. We also created a user, definer, who has been granted the role demo_role.

When a routine encounters a problem, it may respond in several ways, such as by recovering internally, emitting a warning, returning a marker value or incomplete result, or throwing an exception. The following code indicates how an exception can be thrown by some of the code we have already been using: > let req = System.Net.WebRequest.Create("not a URL");; System.UriFormatException: Invalid URI: The format of the URI could not be determined.