Not allowing duplicates on editing some record

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i have a table with email field and email type, i am done with checking if duplicate exists or not ,but when i edit some record and change only the email type field it checks if the email already exists ,since i have changed only email type i am not able to edit the record,can any one help me with this prob.can i do this with REPLACE,recordid is the primary key for this table.

public bool CheckDuplicate(string Email)
		{
			MySqlCommand cmd=null;
			MySqlDataReader dtr=null;
			bool bRv=false;
			try 
			{
				con.Open();
				string str=string.Format("SELECT * FROM tbl_users_email WHERE tbl_users_emailaddress='{0}'",Email);
				cmd=new MySqlCommand(str,con);
				dtr=cmd.ExecuteReader();
				while(dtr.Read())
				{
					bRv=true;
				}
				return bRv;
			} 
			catch (Exception ex) 
			{
				throw ex;
			}
                     }

Posted 9-May-11 20:00pm

girish sp

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girish sp 10-May-11 2:27am

i have to check for duplicates while editing some record because,as both the fields are editable user may enter the email id which is already present in the database??so now i think you understood my problem..

2 solutions

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OriginalGriff · Accepted Answer · 2011-05-09T20:15:00

If you are editing the record, why are you checking if it exists: you already know it does.
Why not just use the Sql UPDATE command:

C#

cmd = new MySqlCommand("UPDATE tbl_users_email SET email_type=@NEWVALUE WHERE tbl_users_emailaddress=@EMAIL", con);
cmd.Parameters.AddWithValue("@NEWVALUE", newEamilType);
cmd.Parameters.AddWithValue("@EMAIL", Email);

Note: Do not create SQL commands by concatenating strings, it leaves you wide open to an accidental or deliberate SQL Injection attack, which can destroy your database. Use Parametrized queries as I show above instead.

cuteband · Accepted Answer · 2011-05-09T20:10:00

Solution 1

You can make it this way.

dtr.Edit
dtr.Email ="YourEmail@EmailServer.Com"
dtr.Update

Posted 9-May-11 20:10pm

cuteband