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SQLDataReader: Is there a way to return a null string is a null is returned?

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Bill Bassler

Is there a way to return a null string is a null is returned or the actual
value (other than null) when a value is present?

myReader[3].ToString(); //returns a empty string when the field returned is
null
myReader.IsDBNull(3) // returns true when the field returned is a null

while (myReader.Read())
{
Label1.Text += myReader.GetString(0); // throws an exception when a
null value is encountered
}

Reply to this message...

Bill Swartz

I think this answers your question.

the IsNull Function in SQL checks for the null value and replaces it with
something.

ie Select IsNull(myColumn,'Null') from myTable

Replaces a null value with the string 'Null'

Bill

-----Original Message-----
From: Bill Bassler [mailto:Click here to reveal e-mail address]
Sent: Monday, July 22, 2002 12:07 PM
To: ngfx-sqlclient
Subject: [ngfx-sqlclient] SQLDataReader: Is there a way to return a null
string is a null is returned?

Is there a way to return a null string is a null is returned or the actual
value (other than null) when a value is present?

myReader[3].ToString(); //returns a empty string when the field returned is
null
myReader.IsDBNull(3) // returns true when the field returned is a null

while (myReader.Read())
{
Label1.Text += myReader.GetString(0); // throws an exception when a
null value is encountered
}

| [ngfx-sqlclient] member Click here to reveal e-mail address = YOUR ID
| http://www.aspfriends.com/aspfriends/ngfx-sqlclient.asp = JOIN/QUIT

Reply to this message...

Bill Bassler

FYI
The SQLDataReader doesn't have an Item property and only has a IsDBNull
method which
returns a Boolean value indicating whether an expression evaluates to the
System.DBNull class.

I did find the the "equivalent" of the VB variant type which returns a
string denoting a null if null, else returns the value.

Also:
The ToString method returns a blank string? for a NULL value or the value.
myReader[3].ToString()

"Bill Swartz" <Click here to reveal e-mail address> wrote in message
news:687034@ngfx-sqlclient...
[Original message clipped]

Reply to this message...

System.DBNull

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