I have the following right now to enter a date into SQL getting the data
from some pull down menus:
-------------------------------------------------
dim dateCCJApproved Date as DateTime
if cbx_ccjDateNone .Checked = True then
dateCCJApproved Date = ctype("", DateTime)
else
dateCCJApproved Date = ctype(ddl_CCJDa teMonth.Selecte dValue.tostring &
"/01/" & ddl_CCJDateYear .SelectedValue. tostring,
System.Data.Sql Types.SqlDateTi me)
End If
-------------------------------------------------
That works if there is a date to enter. But fails if there isn't, as "" is a
string and can't be converted to a date/time.
So, I did a bit of googling, and came up with this:
-------------------------------------------------
dim dateCCJApproved Date as System.Data.Sql Types.SqlDateTi me
if cbx_ccjDateNone .Checked = True then
dateCCJApproved Date = System.Data.Sql Types.SqlDateTi me.null
else
dateCCJApproved Date = ctype(ddl_CCJDa teMonth.Selecte dValue.tostring &
"/01/" & ddl_CCJDateYear .SelectedValue. tostring,
System.Data.Sql Types.SqlDateTi me)
End If
-------------------------------------------------
But I have the opposite problem...I can use the null value, but I can't
convert the second set of data to SQLDateTime.
So, I seem to be trying to use/cast two different types of data to the same
field format in SQL and hence my problem. I'm guessing the second method is
a better approach, but it appears I need to do some sort of intermediate
cast/conversion. Am I on the right track with that line of thinking?
-Darrel 5 10594
command.Paramet ers.Add("@date" , SqlDbType.DateT ime)
if cbx_ccjDateNone .Checked = True then
command.Paramet ers("@date").Va lue = DbNull.Value
else
command.Paramet ers("@date").Va lue =
cdate(ddl_CCJDa teMonth.Selecte dValue.tostring & "/01/" &
ddl_CCJDateYear .SelectedValue. tostring)
end if
hopefully nullable types in 2.0 will make this cleaner..
Karl
--
MY ASP.Net tutorials http://www.openmymind.net/ - New and Improved (yes, the popup is
annoying) http://www.openmymind.net/faq.aspx - unofficial newsgroup FAQ (more to
come!)
"darrel" <no*****@hotmai l.com> wrote in message
news:e3******** *****@TK2MSFTNG P09.phx.gbl... I have the following right now to enter a date into SQL getting the data from some pull down menus:
------------------------------------------------- dim dateCCJApproved Date as DateTime
if cbx_ccjDateNone .Checked = True then dateCCJApproved Date = ctype("", DateTime) else dateCCJApproved Date = ctype(ddl_CCJDa teMonth.Selecte dValue.tostring & "/01/" & ddl_CCJDateYear .SelectedValue. tostring, System.Data.Sql Types.SqlDateTi me) End If -------------------------------------------------
That works if there is a date to enter. But fails if there isn't, as "" is a string and can't be converted to a date/time.
So, I did a bit of googling, and came up with this:
------------------------------------------------- dim dateCCJApproved Date as System.Data.Sql Types.SqlDateTi me
if cbx_ccjDateNone .Checked = True then dateCCJApproved Date = System.Data.Sql Types.SqlDateTi me.null else dateCCJApproved Date = ctype(ddl_CCJDa teMonth.Selecte dValue.tostring & "/01/" & ddl_CCJDateYear .SelectedValue. tostring, System.Data.Sql Types.SqlDateTi me) End If -------------------------------------------------
But I have the opposite problem...I can use the null value, but I can't convert the second set of data to SQLDateTime.
So, I seem to be trying to use/cast two different types of data to the same field format in SQL and hence my problem. I'm guessing the second method is a better approach, but it appears I need to do some sort of intermediate cast/conversion. Am I on the right track with that line of thinking?
-Darrel
> command.Paramet ers.Add("@date" , SqlDbType.DateT ime) if cbx_ccjDateNone .Checked = True then command.Paramet ers("@date").Va lue = DbNull.Value else command.Paramet ers("@date").Va lue = cdate(ddl_CCJDa teMonth.Selecte dValue.tostring & "/01/" & ddl_CCJDateYear .SelectedValue. tostring) end if
So the solution is to use stored procedures?
-Darrel
Parameters can be used with inline sql as well...there's really no excuse
not to use them (and plenty of reasons to do it)
dim c as new SqlCommand("SEL ECT * FROM Blah WHERE x = @Date")
c.Parameters.Ad d("@Date", SqlDbType.DateT ime).Value = SomeValue
works perfectly.
Karl
--
MY ASP.Net tutorials http://www.openmymind.net/ - New and Improved (yes, the popup is
annoying) http://www.openmymind.net/faq.aspx - unofficial newsgroup FAQ (more to
come!)
"darrel" <no*****@hotmai l.com> wrote in message
news:%2******** ********@TK2MSF TNGP09.phx.gbl. .. command.Paramet ers.Add("@date" , SqlDbType.DateT ime) if cbx_ccjDateNone .Checked = True then command.Paramet ers("@date").Va lue = DbNull.Value else command.Paramet ers("@date").Va lue = cdate(ddl_CCJDa teMonth.Selecte dValue.tostring & "/01/" & ddl_CCJDateYear .SelectedValue. tostring) end if
So the solution is to use stored procedures?
-Darrel
You could also use a regular expression validator and not even allow
the call to the sp to happen if the date is not a valid date.
> dim c as new SqlCommand("SEL ECT * FROM Blah WHERE x = @Date") c.Parameters.Ad d("@Date", SqlDbType.DateT ime).Value = SomeValue
Thanks, Carl. I definitely need to start playing with paramaters.
-Darrel This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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