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.NET/Java PDF, Tiff, Barcode SDK LibraryBulk binding avoids this by batching the SQL executions with fewer context switches, thus improving performance Performance Impact of Bulk Binding Let s look at an example that demonstrates bulk binding syntax and also showcases its performance impact We begin by creating two collection types as follows: benchmark@ORA10G> create or replace type object_name_list as table of varchar2(30); 2 / Type created benchmark@ORA10G> create or replace type object_id_list as table of number; 2 / Type created.. barcode generator excel 2003 free, create barcode in excel 2010 free, barcode add in excel freeware, excel barcode font add in, excel barcode generator vba, how to add barcode font in excel 2010, excel barcode font add in, excel barcode generator macro, barcode fonts for excel 2016, barcode in excel formula,Note If your websites do not contain a specific web.config file, they will inherit all of the default settings found within the machine-wide machine.config file. Given this, understand that a root level web.config file is actually overriding various settings in machine.config. You saw in the previous section that mutable references must be explicitly dereferenced. F# also supports mutable locals that are implicitly dereferenced. These must either be top-level definitions or be a local variable in a function. > let mutable cell1 = 1;; val mutable cell1 : int > cell1;; val it : int = 1 > cell1 <- 3;; val it : unit = () > cell1;; val it : int = 3 The following shows how to use a mutable local: let sum n m = let mutable res = 0 for i = n to m do res <- res + i res Next, we create two identical tables, t4 and t5, with each having an object_name and object_id column from the all_objects table (note that the tables are created empty): benchmark@ORA10G> create table t4 as 2 select object_name, object_id 3 from all_objects 4 where 1 != 1; Table created. benchmark@ORA10G> create table t5 as 2 select object_name, object_id 3 from all_objects 4 where 1 != 1; Table created. Now we create two procedures. The first one is called no_bulk_bind. As its name suggests, this procedure inserts a number of records (35,000) into table t4 without using bulk binding in a simple for loop (pretend that the code cannot be written using a single SQL statement): benchmark@ORA10G> create or replace procedure no_bulk_bind( p_object_name_list in object_name_list, p_object_id_list in object_id_list ) 2 as 3 begin 4 for i in 1..p_object_name_list.count loop 5 insert into t4( object_name, object_id) values( p_object_name_list(i), p_object_id_list(i)); 6 end loop; 7 end; 8 / Procedure created. The second procedure, bulk_bind, uses the forall syntax to insert the same number of records using bulk bind, this time into table t5: benchmark@ORA10G> create or replace procedure bulk_bind( p_object_name_list in object_name_list, p_object_id_list in object_id_list ) 2 as 3 begin 4 forall i in 1..p_object_name_list.count 5 insert into t5( object_name, object_id) values( p_object_name_list(i), p_object_id_list(i)); 6 end; 7 / Procedure created. As we briefly mentioned in 1, authentication is often the first step in securing a system (Web-based or otherwise). Simply put, authentication services provide a way to validate the identity of the current user. Assume you re building an ASP .NET website that demands any and all unauthenticated users supply login credentials before proceeding. Using ASP .NET, you may choose between three possible flavors of authentication (which happen to map to the various principal policies examined during our discussion of role-based security): Windows Authentication: Supplied credentials are validated against the WinNT Security Accounts Manager (SAM) or alternatively by using Active Directory. Passport: Supplied credentials are validated against a Microsoft centralized authentication service. Forms-Based Authentication: Supplied credentials are validated against an application- > sum 3 6;; val it : int = 18 In the release of F# at the time of writing, there are strong restrictions on the use of mutable locals. In particular, unlike mutable references, mutable locals are guaranteed to be stack-allocated values, which is important in some situations because the .NET garbage collector won t move stack values. As a result, mutable locals may not be used at all in any inner lambda expressions or other closure constructs, with the exception of top-level mutable values, which can be used anywhere, and mutable fields of records and objects, which are associated with the heap allocated objects themselves. You ll learn more about mutable object types in 6. There has been discussion amongst the F# designers about lifting these restrictions; until that is done, reference cells and types containing mutable fields can be used to make the existence of heap-allocated imperative state obvious.
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