Stored Procedure For reference
CREATE PROCEDURE sp_Insertion1
(@sempId int,@sempname varchar(50),@sgender varchar(50),@sstreet varchar(50),@semail varchar(50),@spincode varchar(50))
as
insert into employeear(fempid,fempname,fgender,fstreet,femail,fpincode)
values
(@sempId,@sempname,@sgender,@sstreet,@semail,@spincode)
private void btnNew_Click(object sender, EventArgs e)
{
string empid,empname, gender, street, email, pincode;
empid = txtEmpId.Text;
empname = txtEmpName.Text;
gender = comboGender.SelectedItem.ToString();
street = rtStreet.Text;
email = txtEmail.Text;
pincode = txtPincode.Text;
int empidint = int.Parse(empid);
SqlCommand dbcmd = new SqlCommand();
SqlConnection conn = new SqlConnection("Server=192.168.1.5;" + "Database=trainee;"+ "User ID=senthilkumar;" + "Password=gtpl;" + "Trusted_Connection=false;");
SqlCommand command = new SqlCommand("sp_Insertion1", conn);
command.CommandType = CommandType.StoredProcedure;
command.Parameters.Add("@sempid", SqlDbType.Int).Value = empidint;
command.Parameters.Add("@sempname",SqlDbType.VarChar).Value = empname;
command.Parameters.Add("@sgender", SqlDbType.VarChar).Value = gender;
command.Parameters.Add("@sstreet", SqlDbType.VarChar).Value = street;
command.Parameters.Add("@semail", SqlDbType.VarChar).Value = email;
command.Parameters.Add("@spincode",SqlDbType.VarChar).Value = pincode;
conn.Open();
int rows = command.ExecuteNonQuery();
conn.Close();
}
Update Stored Procedure
ALTER PROCEDURE sp_updation(@sempId int
,@sempname varchar(50)
,@sgender varchar(50)
,@sstreet varchar(50)
,@semail varchar(50)
,@spincode varchar(50))
as
update employeear
set fempid=@sempId
,fempname=@sempname
,fgender=@sgender
,fstreet=@sstreet
,femail=@semail
,fpincode=@spincode
where fempid=@sempId
Delete data from stored procedure
create procedure sp_address_delete(@sid int)as
delete from address where tid=@sid
Select data from Stored Procedure
create procedure sp_address_show(@sid int)
as
select * from address where tid=@sid
Select stored procedure with data type conversion
ALTER procedure [dbo].[sp_address_show](@sid int)
as
select
ttitle,
tname,
taddress,
tlandmark,
tresident,CONVERT (varchar(10),tdob) from address where tid=@sid
Update the table with type conversion
create procedure sp_address_update
(
@sid int
,@stitle varchar(10)
,@sname varchar(25)
,@saddress varchar(55)
,@slandmark varchar(25)
,@sresident varchar(10)
,@sdob varchar(10)
)
as begin
update address
set
ttitle=@stitle,
tname=@sname,
taddress=@saddress,
tlandmark=@slandmark,
tresident=@sresident,
tdob=CONVERT(datetime,@sdob,103)
where
tid=@sid
end
Stored Procedure for Insertion
CREATE PROCEDURE sp_Insertion1
(@sempId int,@sempname varchar(50),@sgender varchar(50),@sstreet varchar(50),@semail varchar(50),@spincode varchar(50))
as
SET NOCOUNT ON;
insert into employeear(fempid,fempname,fgender,fstreet,femail,fpincode)
values
(@sempId,@sempname,@sgender,@sstreet,@semail,@spincode)
Multiple Queries in stored procedure
alter procedure sp_insertnew(
@empid int,
@depid int,
@depname varchar(20),
@fname varchar(20),
@lname varchar(20),
@gender varchar(6),
@dob datetime,
@doj datetime,
@email varchar(20),
@city varchar(20),
@astatus varchar(20),
@dateandtime datetime)
as begin
insert into Employenew(
empid,depid,fname,lname,gender,dob,doj,email,city)
values
(@empid,@depid,@fname,@lname,@gender,@dob,@doj,@email,@city)
insert into hEmployeenew(
empid,depid,fname,lname,gender,dob,doj,email,city,astatus,dateandtime)
values(
@empid,@depid,@fname,@lname,@gender,@dob,@doj,@email,@city,@astatus,@dateandtime)
insert into Departnew(
depid,depname)
values(
@depid,@depname)
end
Dotnet, DotnetCore, Azure, C#,VB.net, Sql Server, WCF, MVC ,Linq, Javascript and Jquery
9 September 2010
Queries For reference
Queries For Reference
Creating Table Employee
create table Employe
(Empid int primary key identity,
Empname varchar(20),
Dob datetime,
Doj datetime,
sex varchar(10))
Creating table Depart
create table Depart(
Depid int not null,
Empid int not null,
Dept varchar(15),
Salary int)
Alter Primary Key
alter table Departnew add primary key(depid)
select * from Employe
select * from Employe where Empid=2
select * from Employe where Empid!=2
select Empid,Empname from Employ
Top Queries
Select Top 1 * from Employe
select Top 25 percent * from Employe
select top 25 percent Empid,Empname from Employe
select top 25 percent * from Employe where Empid=1
Using Top query in Descending Order
select top 25 percent * from Employe order by Empid Desc
Distinct Queries
select distinct Empname from Employe
select COUNT(distinct Empname)from Employe
Query Multiple Tables
select Employe.Empname,Employe.Dob,Depart.Depid,Depart.Salary from Employe,Depart where Employe.Empid=Depart.Depid
Sub Queries
select Empid,Empname from Employe where exists(Select Empid from Depart where Employe.Empid=Depart.Empid)
select Depid,Empid,Dept,Salary from Depart where Salary in(Select MAX(Salary)from Depart)
Orderby
select * from Trainee.dbo.Depart order by Empid desc
Aggregate Function
select AVG(Salary)"Average salary"from Trainee.dbo.Depart
select * from Trainee.dbo.Depart where Salary=(select MIN(Salary)from Trainee.Dbo.Depart)
select * from Trainee.dbo.Depart where Salary=(select MAX(Salary)from Trainee.Dbo.Depart)
To create databackup in table without making schema
select * into Worker1 from Employe
Union
select * from Worker1 union Select * from Employe
Union all
select * from Worker1 unionall Select * from Employe
Inner Join
select * from Employe join Depart on Employe.Empid=Depart.Empid
Left Join
LEFT JOIN: Return all rows from the left table, even if there are no matches in the right table
select * from Employe left join Depart on Employe.Empid=Depart.Empid
Right Join
RIGHT JOIN: Return all rows from the right table, even if there are no matches in the left table
select * from Employe Right join Depart on Employe.Empid=Depart.Empid
FULL JOIN
FULL JOIN: Return rows when there is a match in one of the tables
select * from Employe FULL JOIN Depart on Employe.Empid=Depart.Empid
SQL Constraints
Constraints are used to limit the type of data that can go into a table.
NOT NULL,UNIQUE,PRIMARY KEY,FOREIGN KEY,CHECK,DEFAULT
SQL DEFAULT Constraint
CREATE TABLE Persons
(
P_Id int NOT NULL,
LastName varchar(255) NOT NULL,
FirstName varchar(255),
Address varchar(255),
City varchar(255) DEFAULT 'Sandnes'
)
Group By function
select Depid,sum(Salary) from Depart group by Depid
Count Function
select COUNT (*) from Employe
Count Disinct Column
SELECT COUNT(DISTINCT Dept) FROM Depart
To find Length
SELECT len(Empname) from Employe
EXCEPT operator
SELECT * from Employe where Empid between 1 AND 8
EXCEPT
SELECT * from Employe where Empid between 5 and 8
INTERSECT operator
The SQL INTERSECT operator takes the results of two queries and returns only rows that appear in both result sets
SELECT * from Employe where Empid between 1 AND 8
intersect
SELECT * from Employe where Empid between 5 and 8
Using the % Wildcard and like operator
select * from Employe where Empname like 'a%'
Dateadd
SELECT Empid,DATEADD(day,45,Doj) AS Doj
FROM Employe
Datediff
DECLARE @StartDate DATETIME
DECLARE @EndDate DATETIME
SET @StartDate ='1984-02-29'
SET @EndDate ='2008-02-29'
SELECT DATEDIFF(Year, @StartDate, @EndDate) AS NewDate
Quarter Difference
DECLARE @StartDate DATETIME
DECLARE @EndDate DATETIME
SET @StartDate ='2007-06-05'
SET @EndDate ='2007-08-05'
SELECT DATEDIFF(quarter, @StartDate, @EndDate) AS NewDate
Month Difference
DECLARE @StartDate DATETIME
DECLARE @EndDate DATETIME
SET @StartDate ='2007-06-05'
SET @EndDate ='2007-08-02'
SELECT DATEDIFF(Month, @StartDate, @EndDate) AS NewDate
DECLARE @StartDate DATETIME
DECLARE @EndDate DATETIME
SET @StartDate ='2007-06-05'
SET @EndDate ='2007-08-02'
SELECT DATEDIFF(dayofyear,@StartDate, @EndDate) AS NewDate
DECLARE @StartDate DATETIME
DECLARE @EndDate DATETIME
SET @StartDate ='2007-06-05'
SET @EndDate ='2007-08-02'
SELECT DATEDIFF(Day, @StartDate, @EndDate) AS NewDate
DECLARE @StartDate DATETIME
DECLARE @EndDate DATETIME
SET @StartDate ='2007-06-05'
SET @EndDate ='2007-08-02'
SELECT DATEDIFF(Week, @StartDate, @EndDate) AS NewDate
DECLARE @StartDate DATETIME
DECLARE @EndDate DATETIME
SET @StartDate ='2007-06-05'
SET @EndDate ='2007-08-02'
SELECT DATEDIFF(Hour, @StartDate, @EndDate) AS NewDate
DECLARE @StartDate DATETIME
DECLARE @EndDate DATETIME
SET @StartDate ='2007-06-05'
SET @EndDate ='2007-08-02'
SELECT DATEDIFF(minute, @StartDate, @EndDate) AS NewDate
DECLARE @StartDate DATETIME
DECLARE @EndDate DATETIME
SET @StartDate ='2007-06-05'
SET @EndDate ='2007-08-02'
SELECT DATEDIFF(second, @StartDate, @EndDate) AS NewDate
DECLARE @StartDate DATETIME
DECLARE @EndDate DATETIME
SET @StartDate ='2007-06-05'
SET @EndDate ='2007-06-06'
SELECT DATEDIFF(millisecond, @StartDate, @EndDate) AS NewDate
Datetime format
Value of current Date Time GETDATE()
SELECT (GETDATE()) = 2007-06-06 23:41:10.153
SELECT CONVERT(varchar,GETDATE(),0)
Return Value = Jun 6 2007 11:07PM
SELECT CONVERT(varchar,GETDATE(),100)
Return Value = Jun 6 2007 11:07PM
SELECT CONVERT(varchar,GETDATE(),1)
Return Value = 06/06/07
SELECT CONVERT(varchar,GETDATE(),101)
Return Value = 06/06/2007
SELECT CONVERT(varchar,GETDATE(),2)
Return Value = 07.06.06
SELECT CONVERT(varchar,GETDATE(),102)
Return Value = 2007.06.06
SELECT CONVERT(varchar,GETDATE(),3)
Return Value = 06/06/07
SELECT CONVERT(varchar,GETDATE(),103)
Return Value = 06/06/2007
SELECT CONVERT(varchar,GETDATE(),4)
Return Value = 06.06.07
SELECT CONVERT(varchar,GETDATE(),104)
Return Value = 06.06.2007
SELECT CONVERT(varchar,GETDATE(),5)
Return Value = 06-06-07
SELECT CONVERT(varchar,GETDATE(),105)
Return Value = 06-06-2007
SELECT CONVERT(varchar,GETDATE(),6)
Return Value = 06 Jun 07
SELECT CONVERT(varchar,GETDATE(),106)
Return Value = 06 Jun 2007
SELECT CONVERT(varchar,GETDATE(),7)
Return Value = Jun 06, 07
SELECT CONVERT(varchar,GETDATE(),107)
Return Value = Jun 06, 2007
SELECT CONVERT(varchar,GETDATE(),8)
Return Value = 23:38:49
SELECT CONVERT(varchar,GETDATE(),108)
Return Value = 23:38:49
SELECT CONVERT(varchar,GETDATE(),9)
Return Value = Jun 6 2007 11:39:17:060PM
SELECT CONVERT(varchar,GETDATE(),109)
Return Value = Jun 6 2007 11:39:17:060PM
SELECT CONVERT(varchar,GETDATE(),10)
Return Value = 06-06-07
SELECT CONVERT(varchar,GETDATE(),110)
Return Value = 06-06-2007
SELECT CONVERT(varchar,GETDATE(),11)
Return Value = 07/06/06
SELECT CONVERT(varchar,GETDATE(),111)
Return Value = 2007/06/06
SELECT CONVERT(varchar,GETDATE(),12)
Return Value = 070606
SELECT CONVERT(varchar,GETDATE(),112)
Return Value = 20070606
SELECT CONVERT(varchar,GETDATE(),13)
Return Value = 06 Jun 2007 23:40:14:577
SELECT CONVERT(varchar,GETDATE(),113)
Return Value = 06 Jun 2007 23:40:14:577
SELECT CONVERT(varchar,GETDATE(),14)
Return Value = 23:40:29:717
SELECT CONVERT(varchar,GETDATE(),114)
Return Value = 23:40:29:717
SELECT CONVERT(varchar,GETDATE(),20)
Return Value = 2007-06-06 23:40:51
SELECT CONVERT(varchar,GETDATE(),120)
Return Value = 2007-06-06 23:40:51
SELECT CONVERT(varchar,GETDATE(),21)
Return Value = 2007-06-06 23:41:10.153
SELECT CONVERT(varchar,GETDATE(),121)
Return Value = 2007-06-06 23:41:10.153
SELECT CONVERT(varchar,GETDATE(),126)
Return Value = 2007-06-06T23:41:10.153
SELECT CONVERT(varchar,GETDATE(),131)
Return Value = 21/05/1428 11:41:10:153PM
Creating Table Employee
create table Employe
(Empid int primary key identity,
Empname varchar(20),
Dob datetime,
Doj datetime,
sex varchar(10))
Creating table Depart
create table Depart(
Depid int not null,
Empid int not null,
Dept varchar(15),
Salary int)
Alter Primary Key
alter table Departnew add primary key(depid)
select * from Employe
select * from Employe where Empid=2
select * from Employe where Empid!=2
select Empid,Empname from Employ
Top Queries
Select Top 1 * from Employe
select Top 25 percent * from Employe
select top 25 percent Empid,Empname from Employe
select top 25 percent * from Employe where Empid=1
Using Top query in Descending Order
select top 25 percent * from Employe order by Empid Desc
Distinct Queries
select distinct Empname from Employe
select COUNT(distinct Empname)from Employe
Query Multiple Tables
select Employe.Empname,Employe.Dob,Depart.Depid,Depart.Salary from Employe,Depart where Employe.Empid=Depart.Depid
Sub Queries
select Empid,Empname from Employe where exists(Select Empid from Depart where Employe.Empid=Depart.Empid)
select Depid,Empid,Dept,Salary from Depart where Salary in(Select MAX(Salary)from Depart)
Orderby
select * from Trainee.dbo.Depart order by Empid desc
Aggregate Function
select AVG(Salary)"Average salary"from Trainee.dbo.Depart
select * from Trainee.dbo.Depart where Salary=(select MIN(Salary)from Trainee.Dbo.Depart)
select * from Trainee.dbo.Depart where Salary=(select MAX(Salary)from Trainee.Dbo.Depart)
To create databackup in table without making schema
select * into Worker1 from Employe
Union
select * from Worker1 union Select * from Employe
Union all
select * from Worker1 unionall Select * from Employe
Inner Join
select * from Employe join Depart on Employe.Empid=Depart.Empid
Left Join
LEFT JOIN: Return all rows from the left table, even if there are no matches in the right table
select * from Employe left join Depart on Employe.Empid=Depart.Empid
Right Join
RIGHT JOIN: Return all rows from the right table, even if there are no matches in the left table
select * from Employe Right join Depart on Employe.Empid=Depart.Empid
FULL JOIN
FULL JOIN: Return rows when there is a match in one of the tables
select * from Employe FULL JOIN Depart on Employe.Empid=Depart.Empid
SQL Constraints
Constraints are used to limit the type of data that can go into a table.
NOT NULL,UNIQUE,PRIMARY KEY,FOREIGN KEY,CHECK,DEFAULT
SQL DEFAULT Constraint
CREATE TABLE Persons
(
P_Id int NOT NULL,
LastName varchar(255) NOT NULL,
FirstName varchar(255),
Address varchar(255),
City varchar(255) DEFAULT 'Sandnes'
)
Group By function
select Depid,sum(Salary) from Depart group by Depid
Count Function
select COUNT (*) from Employe
Count Disinct Column
SELECT COUNT(DISTINCT Dept) FROM Depart
To find Length
SELECT len(Empname) from Employe
EXCEPT operator
SELECT * from Employe where Empid between 1 AND 8
EXCEPT
SELECT * from Employe where Empid between 5 and 8
INTERSECT operator
The SQL INTERSECT operator takes the results of two queries and returns only rows that appear in both result sets
SELECT * from Employe where Empid between 1 AND 8
intersect
SELECT * from Employe where Empid between 5 and 8
Using the % Wildcard and like operator
select * from Employe where Empname like 'a%'
Dateadd
SELECT Empid,DATEADD(day,45,Doj) AS Doj
FROM Employe
Datediff
DECLARE @StartDate DATETIME
DECLARE @EndDate DATETIME
SET @StartDate ='1984-02-29'
SET @EndDate ='2008-02-29'
SELECT DATEDIFF(Year, @StartDate, @EndDate) AS NewDate
Quarter Difference
DECLARE @StartDate DATETIME
DECLARE @EndDate DATETIME
SET @StartDate ='2007-06-05'
SET @EndDate ='2007-08-05'
SELECT DATEDIFF(quarter, @StartDate, @EndDate) AS NewDate
Month Difference
DECLARE @StartDate DATETIME
DECLARE @EndDate DATETIME
SET @StartDate ='2007-06-05'
SET @EndDate ='2007-08-02'
SELECT DATEDIFF(Month, @StartDate, @EndDate) AS NewDate
DECLARE @StartDate DATETIME
DECLARE @EndDate DATETIME
SET @StartDate ='2007-06-05'
SET @EndDate ='2007-08-02'
SELECT DATEDIFF(dayofyear,@StartDate, @EndDate) AS NewDate
DECLARE @StartDate DATETIME
DECLARE @EndDate DATETIME
SET @StartDate ='2007-06-05'
SET @EndDate ='2007-08-02'
SELECT DATEDIFF(Day, @StartDate, @EndDate) AS NewDate
DECLARE @StartDate DATETIME
DECLARE @EndDate DATETIME
SET @StartDate ='2007-06-05'
SET @EndDate ='2007-08-02'
SELECT DATEDIFF(Week, @StartDate, @EndDate) AS NewDate
DECLARE @StartDate DATETIME
DECLARE @EndDate DATETIME
SET @StartDate ='2007-06-05'
SET @EndDate ='2007-08-02'
SELECT DATEDIFF(Hour, @StartDate, @EndDate) AS NewDate
DECLARE @StartDate DATETIME
DECLARE @EndDate DATETIME
SET @StartDate ='2007-06-05'
SET @EndDate ='2007-08-02'
SELECT DATEDIFF(minute, @StartDate, @EndDate) AS NewDate
DECLARE @StartDate DATETIME
DECLARE @EndDate DATETIME
SET @StartDate ='2007-06-05'
SET @EndDate ='2007-08-02'
SELECT DATEDIFF(second, @StartDate, @EndDate) AS NewDate
DECLARE @StartDate DATETIME
DECLARE @EndDate DATETIME
SET @StartDate ='2007-06-05'
SET @EndDate ='2007-06-06'
SELECT DATEDIFF(millisecond, @StartDate, @EndDate) AS NewDate
Datetime format
Value of current Date Time GETDATE()
SELECT (GETDATE()) = 2007-06-06 23:41:10.153
SELECT CONVERT(varchar,GETDATE(),0)
Return Value = Jun 6 2007 11:07PM
SELECT CONVERT(varchar,GETDATE(),100)
Return Value = Jun 6 2007 11:07PM
SELECT CONVERT(varchar,GETDATE(),1)
Return Value = 06/06/07
SELECT CONVERT(varchar,GETDATE(),101)
Return Value = 06/06/2007
SELECT CONVERT(varchar,GETDATE(),2)
Return Value = 07.06.06
SELECT CONVERT(varchar,GETDATE(),102)
Return Value = 2007.06.06
SELECT CONVERT(varchar,GETDATE(),3)
Return Value = 06/06/07
SELECT CONVERT(varchar,GETDATE(),103)
Return Value = 06/06/2007
SELECT CONVERT(varchar,GETDATE(),4)
Return Value = 06.06.07
SELECT CONVERT(varchar,GETDATE(),104)
Return Value = 06.06.2007
SELECT CONVERT(varchar,GETDATE(),5)
Return Value = 06-06-07
SELECT CONVERT(varchar,GETDATE(),105)
Return Value = 06-06-2007
SELECT CONVERT(varchar,GETDATE(),6)
Return Value = 06 Jun 07
SELECT CONVERT(varchar,GETDATE(),106)
Return Value = 06 Jun 2007
SELECT CONVERT(varchar,GETDATE(),7)
Return Value = Jun 06, 07
SELECT CONVERT(varchar,GETDATE(),107)
Return Value = Jun 06, 2007
SELECT CONVERT(varchar,GETDATE(),8)
Return Value = 23:38:49
SELECT CONVERT(varchar,GETDATE(),108)
Return Value = 23:38:49
SELECT CONVERT(varchar,GETDATE(),9)
Return Value = Jun 6 2007 11:39:17:060PM
SELECT CONVERT(varchar,GETDATE(),109)
Return Value = Jun 6 2007 11:39:17:060PM
SELECT CONVERT(varchar,GETDATE(),10)
Return Value = 06-06-07
SELECT CONVERT(varchar,GETDATE(),110)
Return Value = 06-06-2007
SELECT CONVERT(varchar,GETDATE(),11)
Return Value = 07/06/06
SELECT CONVERT(varchar,GETDATE(),111)
Return Value = 2007/06/06
SELECT CONVERT(varchar,GETDATE(),12)
Return Value = 070606
SELECT CONVERT(varchar,GETDATE(),112)
Return Value = 20070606
SELECT CONVERT(varchar,GETDATE(),13)
Return Value = 06 Jun 2007 23:40:14:577
SELECT CONVERT(varchar,GETDATE(),113)
Return Value = 06 Jun 2007 23:40:14:577
SELECT CONVERT(varchar,GETDATE(),14)
Return Value = 23:40:29:717
SELECT CONVERT(varchar,GETDATE(),114)
Return Value = 23:40:29:717
SELECT CONVERT(varchar,GETDATE(),20)
Return Value = 2007-06-06 23:40:51
SELECT CONVERT(varchar,GETDATE(),120)
Return Value = 2007-06-06 23:40:51
SELECT CONVERT(varchar,GETDATE(),21)
Return Value = 2007-06-06 23:41:10.153
SELECT CONVERT(varchar,GETDATE(),121)
Return Value = 2007-06-06 23:41:10.153
SELECT CONVERT(varchar,GETDATE(),126)
Return Value = 2007-06-06T23:41:10.153
SELECT CONVERT(varchar,GETDATE(),131)
Return Value = 21/05/1428 11:41:10:153PM
How To Link Within A Page.
How To Link Within A Page.
Do you want to people to be able to get to different parts of your page easier or do you just want to add a link so people can get back to the top of the page easily? Then come in and find out how.
Here's How:
1.Create the hook for where you want to go when the main link is clicked on: Title Of The Page
2.Give your link a name (here it is called top) and give it a title.
3.Create the link that will be clicked on. This link tells the browser where to go: Back To The Top
4.Use the same name as used in the hook and give it a title (here the title is Back To The Top).
Tips:
1.Make sure you give the same name to each or it won't work!
Do you want to people to be able to get to different parts of your page easier or do you just want to add a link so people can get back to the top of the page easily? Then come in and find out how.
Here's How:
1.Create the hook for where you want to go when the main link is clicked on: Title Of The Page
2.Give your link a name (here it is called top) and give it a title.
3.Create the link that will be clicked on. This link tells the browser where to go: Back To The Top
4.Use the same name as used in the hook and give it a title (here the title is Back To The Top).
Tips:
1.Make sure you give the same name to each or it won't work!
8 September 2010
How Internet Infrastructure Works
How Internet Infrastructure Works
One of the greatest things about the Internet is that nobody really owns it. It is a global collection of networks, both big and small. These networks connect together in many different ways to form the single entity that we know as the Internet. In fact, the very name comes from this idea of interconnected networks.
Since its beginning in 1969, the Internet has grown from four host computer systems to tens of millions. However, just because nobody owns the Internet, it doesn't mean it is not monitored and maintained in different ways. The Internet Society, a non-profit group established in 1992, oversees the formation of the policies and protocols that define how we use and interact with the Internet.
In this article, you will learn about the basic underlying structure of the Internet. You will learn about domain name servers, network access points and backbones. But first you will learn about how your computer connects to others.
The Internet: Computer Network Hierarchy
Every computer that is connected to the Internet is part of a network, even the one in your home. For example, you may use a modem and dial a local number to connect to an Internet Service Provider (ISP). At work, you may be part of a local area network (LAN), but you most likely still connect to the Internet using an ISP that your company has contracted with. When you connect to your ISP, you become part of their network. The ISP may then connect to a larger network and become part of their network. The Internet is simply a network of networks.
Most large communications companies have their own dedicated backbones connecting various regions. In each region, the company has a Point of Presence (POP). The POP is a place for local users to access the company's network, often through a local phone number or dedicated line. The amazing thing here is that there is no overall controlling network. Instead, there are several high-level networks connecting to each other through Network Access Points or NAPs.
Internet Network Example
Heres an example.
Imagine that Company A is a large ISP. In each major city, Company A has a POP. The POP in each city is a rack full of modems that the ISP's customers dial into. Company A leases fiber optic lines from the phone company to connect the POPs together (see, for example, this UUNET Data Center Connectivity Map).
Imagine that Company B is a corporate ISP. Company B builds large buildings in major cities and corporations locate their Internet server machines in these buildings. Company B is such a large company that it runs its own fiber optic lines between its buildings so that they are all interconnected.
In this arrangement, all of Company A's customers can talk to each other, and all of Company B's customers can talk to each other, but there is no way for Company A's customers and Company B's customers to intercommunicate. Therefore, Company A and Company B both agree to connect to NAPs in various cities, and traffic between the two companies flows between the networks at the NAPs.
In the real Internet, dozens of large Internet providers interconnect at NAPs in various cities, and trillions of bytes of data flow between the individual networks at these points. The Internet is a collection of huge corporate networks that agree to all intercommunicate with each other at the NAPs. In this way, every computer on the Internet connects to every other.
All of these networks rely on NAPs, backbones and routers to talk to each other. What is incredible about this process is that a message can leave one computer and travel halfway across the world through several different networks and arrive at another computer in a fraction of a second!
The routers determine where to send information from one computer to another. Routers are specialized computers that send your messages and those of every other Internet user speeding to their destinations along thousands of pathways. A router has two separate, but related, jobs:
• It ensures that information doesn't go where it's not needed. This is crucial for keeping large volumes of data from clogging the connections of "innocent bystanders."
• It makes sure that information does make it to the intended destination.
In performing these two jobs, a router is extremely useful in dealing with two separate computer networks. It joins the two networks, passing information from one to the other. It also protects the networks from one another, preventing the traffic on one from unnecessarily spilling over to the other. Regardless of how many networks are attached, the basic operation and function of the router remains the same. Since the Internet is one huge network made up of tens of thousands of smaller networks, its use of routers is an absolute necessity. For more information,
Internet Backbone
The National Science Foundation (NSF) created the first high-speed backbone in 1987. Called NSFNET, it was a T1 line that connected 170 smaller networks together and operated at 1.544 Mbps (million bits per second). IBM, MCI and Merit worked with NSF to create the backbone and developed a T3 (45 Mbps) backbone the following year.
Backbones are typically fiber optic trunk lines. The trunk line has multiple fiber optic cables combined together to increase the capacity. Fiber optic cables are designated OC for optical carrier, such as OC-3, OC-12 or OC-48. An OC-3 line is capable of transmitting 155 Mbps while an OC-48 can transmit 2,488 Mbps (2.488 Gbps). Compare that to a typical 56K modem transmitting 56,000 bps and you see just how fast a modern backbone is.
Today there are many companies that operate their own high-capacity backbones, and all of them interconnect at various NAPs around the world. In this way, everyone on the Internet, no matter where they are and what company they use, is able to talk to everyone else on the planet. The entire Internet is a gigantic, sprawling agreement between companies to intercommunicate freely.
Internet Protocol: IP Addresses
Every machine on the Internet has a unique identifying number, called an IP Address. The IP stands for Internet Protocol, which is the language that computers use to communicate over the Internet. A protocol is the pre-defined way that someone who wants to use a service talks with that service. The "someone" could be a person, but more often it is a computer program like a Web browser.
A typical IP address looks like this:
216.27.61.137
To make it easier for us humans to remember, IP addresses are normally expressed in decimal format as a dotted decimal number like the one above. But computers communicate in binary form. Look at the same IP address in binary:
11011000.00011011.00111101.10001001
The four numbers in an IP address are called octets, because they each have eight positions when viewed in binary form. If you add all the positions together, you get 32, which is why IP addresses are considered 32-bit numbers. Since each of the eight positions can have two different states (1 or zero), the total number of possible combinations per octet is 28 or 256. So each octet can contain any value between zero and 255. Combine the four octets and you get 232 or a possible 4,294,967,296 unique values!
Out of the almost 4.3 billion possible combinations, certain values are restricted from use as typical IP addresses. For example, the IP address 0.0.0.0 is reserved for the default network and the address 255.255.255.255 is used for broadcasts
One of the greatest things about the Internet is that nobody really owns it. It is a global collection of networks, both big and small. These networks connect together in many different ways to form the single entity that we know as the Internet. In fact, the very name comes from this idea of interconnected networks.
Since its beginning in 1969, the Internet has grown from four host computer systems to tens of millions. However, just because nobody owns the Internet, it doesn't mean it is not monitored and maintained in different ways. The Internet Society, a non-profit group established in 1992, oversees the formation of the policies and protocols that define how we use and interact with the Internet.
In this article, you will learn about the basic underlying structure of the Internet. You will learn about domain name servers, network access points and backbones. But first you will learn about how your computer connects to others.
The Internet: Computer Network Hierarchy
Every computer that is connected to the Internet is part of a network, even the one in your home. For example, you may use a modem and dial a local number to connect to an Internet Service Provider (ISP). At work, you may be part of a local area network (LAN), but you most likely still connect to the Internet using an ISP that your company has contracted with. When you connect to your ISP, you become part of their network. The ISP may then connect to a larger network and become part of their network. The Internet is simply a network of networks.
Most large communications companies have their own dedicated backbones connecting various regions. In each region, the company has a Point of Presence (POP). The POP is a place for local users to access the company's network, often through a local phone number or dedicated line. The amazing thing here is that there is no overall controlling network. Instead, there are several high-level networks connecting to each other through Network Access Points or NAPs.
Internet Network Example
Heres an example.
Imagine that Company A is a large ISP. In each major city, Company A has a POP. The POP in each city is a rack full of modems that the ISP's customers dial into. Company A leases fiber optic lines from the phone company to connect the POPs together (see, for example, this UUNET Data Center Connectivity Map).
Imagine that Company B is a corporate ISP. Company B builds large buildings in major cities and corporations locate their Internet server machines in these buildings. Company B is such a large company that it runs its own fiber optic lines between its buildings so that they are all interconnected.
In this arrangement, all of Company A's customers can talk to each other, and all of Company B's customers can talk to each other, but there is no way for Company A's customers and Company B's customers to intercommunicate. Therefore, Company A and Company B both agree to connect to NAPs in various cities, and traffic between the two companies flows between the networks at the NAPs.
In the real Internet, dozens of large Internet providers interconnect at NAPs in various cities, and trillions of bytes of data flow between the individual networks at these points. The Internet is a collection of huge corporate networks that agree to all intercommunicate with each other at the NAPs. In this way, every computer on the Internet connects to every other.
All of these networks rely on NAPs, backbones and routers to talk to each other. What is incredible about this process is that a message can leave one computer and travel halfway across the world through several different networks and arrive at another computer in a fraction of a second!
The routers determine where to send information from one computer to another. Routers are specialized computers that send your messages and those of every other Internet user speeding to their destinations along thousands of pathways. A router has two separate, but related, jobs:
• It ensures that information doesn't go where it's not needed. This is crucial for keeping large volumes of data from clogging the connections of "innocent bystanders."
• It makes sure that information does make it to the intended destination.
In performing these two jobs, a router is extremely useful in dealing with two separate computer networks. It joins the two networks, passing information from one to the other. It also protects the networks from one another, preventing the traffic on one from unnecessarily spilling over to the other. Regardless of how many networks are attached, the basic operation and function of the router remains the same. Since the Internet is one huge network made up of tens of thousands of smaller networks, its use of routers is an absolute necessity. For more information,
Internet Backbone
The National Science Foundation (NSF) created the first high-speed backbone in 1987. Called NSFNET, it was a T1 line that connected 170 smaller networks together and operated at 1.544 Mbps (million bits per second). IBM, MCI and Merit worked with NSF to create the backbone and developed a T3 (45 Mbps) backbone the following year.
Backbones are typically fiber optic trunk lines. The trunk line has multiple fiber optic cables combined together to increase the capacity. Fiber optic cables are designated OC for optical carrier, such as OC-3, OC-12 or OC-48. An OC-3 line is capable of transmitting 155 Mbps while an OC-48 can transmit 2,488 Mbps (2.488 Gbps). Compare that to a typical 56K modem transmitting 56,000 bps and you see just how fast a modern backbone is.
Today there are many companies that operate their own high-capacity backbones, and all of them interconnect at various NAPs around the world. In this way, everyone on the Internet, no matter where they are and what company they use, is able to talk to everyone else on the planet. The entire Internet is a gigantic, sprawling agreement between companies to intercommunicate freely.
Internet Protocol: IP Addresses
Every machine on the Internet has a unique identifying number, called an IP Address. The IP stands for Internet Protocol, which is the language that computers use to communicate over the Internet. A protocol is the pre-defined way that someone who wants to use a service talks with that service. The "someone" could be a person, but more often it is a computer program like a Web browser.
A typical IP address looks like this:
216.27.61.137
To make it easier for us humans to remember, IP addresses are normally expressed in decimal format as a dotted decimal number like the one above. But computers communicate in binary form. Look at the same IP address in binary:
11011000.00011011.00111101.10001001
The four numbers in an IP address are called octets, because they each have eight positions when viewed in binary form. If you add all the positions together, you get 32, which is why IP addresses are considered 32-bit numbers. Since each of the eight positions can have two different states (1 or zero), the total number of possible combinations per octet is 28 or 256. So each octet can contain any value between zero and 255. Combine the four octets and you get 232 or a possible 4,294,967,296 unique values!
Out of the almost 4.3 billion possible combinations, certain values are restricted from use as typical IP addresses. For example, the IP address 0.0.0.0 is reserved for the default network and the address 255.255.255.255 is used for broadcasts
1 July 2010
Merging arrays in C - royalarun.blogspot.com
Merging arrays in C
#include
void main()
{
int arr1[20] = { 10 , 20 , 30 , 40 , 50};
int arr2[] = { 60 , 70 , 80 , 90 , 100};
int i;
/* Given arr1 and arr2 are the two sorted arrays of length 5 , 5 respectivly
Following code will merg the contents of arr2 with the contents of arr1 */
for( i = 0 ; i < 5 ; i++)
arr1[i+5] = arr2[i];
/* Print the contents of the arr1 */
printf("Contents of the arr1 after merging :");
for( i = 0 ; i < 10 ;i++)
printf("%d " , arr1[i]);
}
#include
void main()
{
int arr1[20] = { 10 , 20 , 30 , 40 , 50};
int arr2[] = { 60 , 70 , 80 , 90 , 100};
int i;
/* Given arr1 and arr2 are the two sorted arrays of length 5 , 5 respectivly
Following code will merg the contents of arr2 with the contents of arr1 */
for( i = 0 ; i < 5 ; i++)
arr1[i+5] = arr2[i];
/* Print the contents of the arr1 */
printf("Contents of the arr1 after merging :");
for( i = 0 ; i < 10 ;i++)
printf("%d " , arr1[i]);
}
21 June 2010
Connectivity in VB.NET AND C# with SQL SERVER
Inserting Data Into a SQL Database using VB.NET
VB.NET CONNECTIVITY CODING AND C# CONNECTIVITY CODING FOR INSERTION
Updating Data in a SQL Database
VB.NET CONNECTIVITY CODING AND C# CONNECTIVITY CODING FOR UPDATION
Deleting Data in a SQL Database
VB.NET CONNECTIVITY CODING AND C# CONNECTIVITY CODING FOR DELETION
Accessing Data with ASP.NET
Binding controls of repeater,Data list, Data grid
ASP.NET State Management
ASP.NET State Management Session,View state, Application State
Index for ASP.NET
Index for ASP.NET IN MSDN
VB.NET CONNECTIVITY CODING AND C# CONNECTIVITY CODING FOR INSERTION
Updating Data in a SQL Database
VB.NET CONNECTIVITY CODING AND C# CONNECTIVITY CODING FOR UPDATION
Deleting Data in a SQL Database
VB.NET CONNECTIVITY CODING AND C# CONNECTIVITY CODING FOR DELETION
Accessing Data with ASP.NET
Binding controls of repeater,Data list, Data grid
ASP.NET State Management
ASP.NET State Management Session,View state, Application State
Index for ASP.NET
Index for ASP.NET IN MSDN
19 June 2010
Difference Between ASP.NET Server Controls,HTML Server Controls and HTML Intrinsic Controls
Difference Between ASP.NET Server Controls,HTML Server Controls and HTML Intrinsic Controls
ASP.NET Server Controls
Advantages:
1. ASP .NET Server Controls can however detect the target browser's capabilities and render themselves accordingly. No issues for compatibility issues of Browsers i.e page that might be used by both HTML 3.2 and HTML 4.0 browsers code to be written by you.
2. Newer set of controls that can be used in the same manner as any HTMl control like Calender controls. (No need of Activex Control for doing this which would then bring up issues of Browser compatibility).
3. Processing would be done at the server side. In built functionality to check for few values(with Validation controls) so no need to choose between scripting language which would be incompatible with few browsers.
4. ASP .NET Server Controls have an object model different from the traditional HTML and even provide a set of properties and methods that can change the outlook and behavior of the controls.
5. ASP .NET Server Controls have higher level of abstraction. An output of an ASP .NET server control can be the result of many HTML tags that combine together to produce that control and its events.
Disadvantages:
1. The control of the code is inbuilt with the web server controls so you have no much of direct control on these controls
2. Migration of ASP to any ASP.NET application is difficult. Its equivalent to rewriting your new application
HTML Server Controls
Advantages:
1. The HTML Server Controls follow the HTML-centric object model. Model similar to HTML
2. Here the controls can be made to interact with Client side scripting. Processing would be done at client as well as server depending on your code.
3. Migration of the ASP project thought not very easy can be done by giving each intrinsic HTML control a runat = server to make it HTML Server side control.
4. The HTML Server Controls have no mechanism of identifying the capabilities of the client browser accessing the current page.
5. A HTML Server Control has similar abstraction with its corresponding HTML tag and offers no abstraction.
Disadvantages:
1. You would need to code for the browser compatibility.
HTML Intrinsic Controls
Advantages:
1. Model similar to HTML
2. Here the controls can be made to interact with Client side scripting
Disadvantages:
1. You would need to code for the browser compatibility
ASP.NET Server Controls
Advantages:
1. ASP .NET Server Controls can however detect the target browser's capabilities and render themselves accordingly. No issues for compatibility issues of Browsers i.e page that might be used by both HTML 3.2 and HTML 4.0 browsers code to be written by you.
2. Newer set of controls that can be used in the same manner as any HTMl control like Calender controls. (No need of Activex Control for doing this which would then bring up issues of Browser compatibility).
3. Processing would be done at the server side. In built functionality to check for few values(with Validation controls) so no need to choose between scripting language which would be incompatible with few browsers.
4. ASP .NET Server Controls have an object model different from the traditional HTML and even provide a set of properties and methods that can change the outlook and behavior of the controls.
5. ASP .NET Server Controls have higher level of abstraction. An output of an ASP .NET server control can be the result of many HTML tags that combine together to produce that control and its events.
Disadvantages:
1. The control of the code is inbuilt with the web server controls so you have no much of direct control on these controls
2. Migration of ASP to any ASP.NET application is difficult. Its equivalent to rewriting your new application
HTML Server Controls
Advantages:
1. The HTML Server Controls follow the HTML-centric object model. Model similar to HTML
2. Here the controls can be made to interact with Client side scripting. Processing would be done at client as well as server depending on your code.
3. Migration of the ASP project thought not very easy can be done by giving each intrinsic HTML control a runat = server to make it HTML Server side control.
4. The HTML Server Controls have no mechanism of identifying the capabilities of the client browser accessing the current page.
5. A HTML Server Control has similar abstraction with its corresponding HTML tag and offers no abstraction.
Disadvantages:
1. You would need to code for the browser compatibility.
HTML Intrinsic Controls
Advantages:
1. Model similar to HTML
2. Here the controls can be made to interact with Client side scripting
Disadvantages:
1. You would need to code for the browser compatibility
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