adVarWChar doesnt work for nvarchar

Hi experts,

One field in my table is set as nvarchar for keeping unicode stuff.  I find my ASP page 's not working smooth. Here are my StoredProc and ASP.

My Stored Proc
-------------------
@ChineseName nvarchar(50),
@StaffExpDate varchar(10)

My ASP
-------------------
Set objParam = .Parameters
objParam.Append .CreateParameter("@ChineseName", adVarWChar, adParamInput, 50, strChineseName)
objParam.Append .CreateParameter("@StaffExpDate", adVarChar, adParamInput, 10, dStaffExpDate)

In my SP, for Chinese Name, if I change to varchar(50),
and change my ASP to
objParam.Append .CreateParameter("@ChineseName", adVarChar, adParamInput, 50, strChineseName),
I can update the stuff without any problem.

However, if I stick with that nvarchar in SP, adVarWChar in ASP, it will show the error
Microsoft OLE DB Provider for SQL Server error '80040e07'

The conversion of a char data type to a datetime data type resulted in an out-of-range datetime value.

I m wondering, would adVarWChar really suitable for nvarchar? Or would there be any better options?

Thanks,
Manfred


manfredinoAsked:
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lahousdenCommented:
What is the character representation of the date that you are passing in to the Stored Procedure?
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NightmanCTOCommented:
adVarWChar is suitable for Chines characters. However, neither nvarchar or varchar are really suitable for dates. You should be using datetime datatype.

As per lahousden's question, what does the data look like that you are passing into the procedure?
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manfredinoAuthor Commented:
adVarWChar works now!

as for the codings previously made , there are several other date fields. In asp, they were set as adVarChar under DD-MM-YYYY format, then in the Stored Proc, dates with DD-MM-YYYY format would be converted like select @tmpChgEndDate=convert(datetime,substring(@ChgEndDate,4,2)+'-'+substring(@ChgEndDate,1,2)+'-'+substring(@ChgEndDate,7,4)) to make it as DD/MM/YYYY

Thanks a lot lahousden & Nightman! Thanks for your advices!
 
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