Comments on: vb.net: insert a truly null date in access db http://hobbylobby.wordpress.com/2007/08/16/vbnet-insert-a-truly-null-date-in-access-db/ |hobby|vb.net|toys|ubuntu|comics|LPs|programming| Sun, 27 Dec 2009 17:31:01 +0000 http://wordpress.com/ hourly 1 By: hobbylobby http://hobbylobby.wordpress.com/2007/08/16/vbnet-insert-a-truly-null-date-in-access-db/#comment-2362 hobbylobby Sun, 27 Jul 2008 13:06:29 +0000 http://hobbylobby.wordpress.com/2007/08/16/vbnet-insert-a-truly-null-date-in-access-db/#comment-2362 vbnotebookfor.net has <a href="http://vbnotebookfor.net/2007/09/27/introduction-to-nullable-types-in-vbnet/" rel="nofollow">exactly what you need</a>. he shows getting from a database, but not setting values to a database. here's one way: If theDate.HasValue Then cmd.Parameters.Add(New OleDb.OleDbParameter("@theDate", theDate)) Else cmd.Parameters.Add(New OleDb.OleDbParameter("@theDate", DBNull.Value)) End If vbnotebookfor.net has exactly what you need.

he shows getting from a database, but not setting values to a database.

here’s one way:
If theDate.HasValue Then
cmd.Parameters.Add(New OleDb.OleDbParameter(“@theDate”, theDate))
Else
cmd.Parameters.Add(New OleDb.OleDbParameter(“@theDate”, DBNull.Value))
End If

]]> By: Eric http://hobbylobby.wordpress.com/2007/08/16/vbnet-insert-a-truly-null-date-in-access-db/#comment-2359 Eric Thu, 17 Jul 2008 19:42:14 +0000 http://hobbylobby.wordpress.com/2007/08/16/vbnet-insert-a-truly-null-date-in-access-db/#comment-2359 Any other "Hints"????? I'm trying to condiinally "undo" a date if a parameter changes by: IIf([PMPPOU] And [PCPOU] And [PSSU] And [PAU] And [DPIRC] And [DMPU] And [DCPU] And [DBU] And [SSU] And [ERMPOC] And [PBN]=True,Date(), Null) If on eof the checkboxes changes to be not true than I want the Date field to go back to Null. I can't get it to work. Any other “Hints”?????

I’m trying to condiinally “undo” a date if a parameter changes by:

IIf([PMPPOU] And [PCPOU] And [PSSU] And [PAU] And [DPIRC] And [DMPU] And [DCPU] And [DBU] And [SSU] And [ERMPOC] And [PBN]=True,Date(), Null)

If on eof the checkboxes changes to be not true than I want the Date field to go back to Null.

I can’t get it to work.

]]> By: hobbylobby http://hobbylobby.wordpress.com/2007/08/16/vbnet-insert-a-truly-null-date-in-access-db/#comment-2357 hobbylobby Sun, 13 Jul 2008 14:15:16 +0000 http://hobbylobby.wordpress.com/2007/08/16/vbnet-insert-a-truly-null-date-in-access-db/#comment-2357 yes. look up nullable(of date) and .hasValue. it's a little tricky to tie it all together, but you can make it work. yes. look up nullable(of date) and .hasValue.

it’s a little tricky to tie it all together, but you can make it work.

]]> By: dfdhfghf http://hobbylobby.wordpress.com/2007/08/16/vbnet-insert-a-truly-null-date-in-access-db/#comment-2343 dfdhfghf Thu, 29 May 2008 10:40:28 +0000 http://hobbylobby.wordpress.com/2007/08/16/vbnet-insert-a-truly-null-date-in-access-db/#comment-2343 how can i insert null value in date column in vb.net? how can i insert null value in date column in vb.net?

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