querry for when inserting data check it is exist or not in databse

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Hi, when i am inserting a data through text box in database. i want to check if data is already exist in the table just shows a message "Data is already exist".
In table there is only two columns id and documentname.
I am using sql server and vs 2005.
Please give me a querry for that.

Thanks in Advance

Posted 24-Feb-12 20:36pm

mayankshrivastava

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2 solutions

Solution 1

Hai fried,
1.The best method is create a unique key in database, and track the error code for displaying error.
2.Another method

SQL

IF EXISTS(SELECT   * FROM  tablename WHERE condition )
	BEGIN
		RAISERROR ('already entered',11,1)
	END
	ELSE
	BEGIN
	--		Insert query
	END

Posted 24-Feb-12 20:51pm

Adersh Ram

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mayankshrivastava 25-Feb-12 3:36am

thanks fro reply Adersh
your querry works fine in sql query analyzer.
problem is that how to write in asp.net.
what is use executenonquerry or something else.
nd how to use it.
how to use return value?
i am new in asp.net

Adersh Ram 25-Feb-12 3:48am

The best method is create a stored procedure for insert the data,and put the condition above, there is row exists in database it return the error message, else it is insert into the database.use normal executenonquery method
if any problem reply me

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Aniket Yadav · Accepted Answer · 2012-02-24T21:35:00

Solution 2

C#

SELECT * FROM TABLENAME WHERE FIELDNAME = '" + YOURSEARCHSTRING + "';

Get the data from this query to datatable and

C#

if(MYDATATABLE.Rows.Count > 0)
{
    Messagebox.Show("Record Already Exists");
}else
{
    //Fire your insert query
}

Hope you will get an idea through this.

Posted 24-Feb-12 21:35pm

Aniket Yadav