Tuesday, 9 July 2013

Insert value in Identity column of table

Hi,
                        In This article we will see how to insert value in Identity column.Identity field
is usually used as a primary key. When you insert a new record into your table,
this field automatically assign an incremented value from the previous entry.
Usually, you can't insert your own value to this field.
In this article, I am going to expose the tips for inserting your own value to this field.
It is simple and easy. Consider you have the following Emp_Info table.


CREATE TABLE Emp_Info
(
ID int IDENTITY,
Emp_Name varchar(100),
Emp_Address varchar(200)
)

Now, I am trying to insert a record into Emp_Info table with
identity field like as then I will get the error message as shown below.

INSERT INTO Emp_Info(ID,Emp_Name,Emp_Address) VALUES(1,'Ajit Gaikwad','sangli')

Error::

Msg 544, Level 16, State 1, Line 1 Cannot insert explicit value for identity column in table 'Emp_Info' when IDENTITY_INSERT is set to OFF.

A) Allow insert into identity field

You can alllow insert to the identity field by setting IDENTITY_INSERT ON for a particular
table as shown:

SET IDENTITY_INSERT Emp_Info ON

B) Disallow insert into identity field

You can also disalllow insert to the identity field by setting IDENTITY_INSERT OFF for a
particular table as shown:

SET IDENTITY_INSERT Emp_Info OFF

Test:: Insert Value to Identity field

Now, lets see how to insert our own values to identity field ID with in the Emp_Info table.


SET IDENTITY_INSERT Emp_Info ON
INSERT INTO Emp_Info(ID,Name,Address) VALUES(3,'harshal','sangli')
INSERT INTO Emp_Info(ID,Name,Address) VALUES(4,'ram','sangli')

SET IDENTITY_INSERT Emp_Info OFF
INSERT INTO Emp_Info(Name,Address) VALUES('rakesh','bihar')
After Inserting your own value to identity field don't forget to set IDENTITY_INSERT OFF.


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