ASP.NET PDF Viewer using C#, VB/NET

else update succeeded end if; Let s look at an example We create a copy of the emp table, called emp1, to hold the sample data for our example We also have a column that we initialize with the value of a sequence We first create the table emp1 with no data its structure is that of the emp table except that it has an additional numeric shadow column called row_change_indicator (notice that the table will be created empty since the where clause, where 1 != 1, will always fail): scott@ORA10G> create table emp1 as 2 select e*, 1 as row_change_indicator 3 from emp e where 1 != 1; Table created Next, we create a sequence, seq1: scott@ORA10G> create sequence seq1 cache 100; Sequence created.

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The ASP .NET Framework provides a rich set of features for leveraging client-side functionality, including JavaScript. The ViewState and ControlState features use HTML hidden input to store state information on the client, which saves you from writing a lot of redundant boilerplate code. However, you must carefully monitor ViewState because it can quickly bloat your requests and responses. Version 2.0 increases the efficiency of the hashing algorithms in use to generate the ViewState value, decreasing the size of the value stored in the hidden input. In some situations, the ViewState size will still cause an unacceptable performance hit; in these cases, you have the option of replacing the location where the ViewState value is stored with one of your choosing (like Session, Cache, or a database).

We now populate the emp1 table with the data from the emp table, along with a different value for row_change_indicator for each row: scott@ORA10G> insert into emp1( empno, ename, job, mgr, hiredate, sal, comm, deptno, row_change_indicator ) 2 select e*, seq1nextval from emp e; 14 rows created..

Sequences can be iterated using the for ... in ... do construct, as well as the Seq.iter aggregate operator discussed in the next section. Here is a simple example of the first: > let range = seq {0 .. 2 .. 6};; val range : seq<int> > for i in range do printfn "i = %d" i;; i = 0 i = 2 i = 4 i = 6 This construct forces the iteration of the entire seq so must be used with care when working with sequences that may yield a large number of elements.

We next create a package, opt_lock_shadowcol_demo, with two methods, get_emp_details and update_emp_info: scott@ORA10G> create or replace package opt_lock_shadowcol_demo 2 as 3 procedure get_emp_details( p_empno in number, p_ename in out varchar2, 4 p_sal in out number, p_row_change_indicator in out number ); 5 procedure update_emp_info( p_empno in number, p_new_sal in number, p_new_ename in varchar2, 6 p_row_change_indicator in number, p_num_of_rows_updated in out number ); 7 end; 8 / Package created. The procedure get_emp_details gets the employee name and salary data, along with the row_change_indicator column value: scott@ORA10G> create or replace package body opt_lock_shadowcol_demo 2 as 3 procedure get_emp_details( p_empno in number, p_ename in out varchar2, 4 p_sal in out number, p_row_change_indicator in out number ) 5 is 6 begin 7 select ename, sal, row_change_indicator 8 into p_ename, p_sal, p_row_change_indicator 9 from emp1 10 where empno = p_empno; 11 end; 12 The following procedure, update_emp_info, updates the employee s salary and name information along with row_column_indicator. The where clause ensures that if row_change_indicator is not the same as the one we got when we selected the row using the get_emp_details method, the update will not affect any rows. 13 procedure update_emp_info( p_empno in number, p_new_sal in number, p_new_ename in varchar2, p_row_change_indicator in number, p_num_of_rows_updated in out number ) is begin p_num_of_rows_updated := 0; update emp1 set sal = p_new_sal, ename = p_new_ename, row_change_indicator = seq1.nextval where empno = p_empno and p_row_change_indicator = row_change_indicator; p_num_of_rows_updated := sql%rowcount;

Any value of type seq<type> can be iterated and transformed using functions in the Microsoft. FSharp.Collections.Seq module. For example: > let range = seq {0 .. 10};; val range : seq<int> > range |> Seq.map (fun i -> (i,i*i));; val it : seq<int * int> = seq [ (0, 0); (1, 1); (2, 4); (3, 9) ... ]