Type mismatch for field 'xxx', expecting: WideString actual: String
MS SQL Server 2000, 2005, 2008. Collated Arabic_CI_AS
Oracle 11g NLS Characterset WE8ISO8859P1
Application using datasnap/dbexpress driver
We have an application that we are converting to runs on both Oracle and MS SQL Server.
The Oracle driver brings back Varchar2 as TWideStringField. The SQL Server driver brings back Varchars as TStringField.
This becomes a problem for our persistent fields. The error we receive is "Type mismatch for field 'xxx', ex...Cast from type ''''DBNull'''' to type ''''String'''' is not valid.
How do I avoid getting this error:
Cast from type ''''DBNull'''' to type ''''String'''' is not valid.
I am trying to get values from the database into a form for updating using a Datareader, SQL is set to allow nulls for certain fields as they are not required but the only way I can get the form to display is by adding a space in SQL.
Is there another way around this?
Check if it is equal to DBNull.Value first and if it is, don't do the cast.Stanley Tan
Where in the code does it need to go?
I am using the following and it's the profile that isn't always requi...Cast from type 'DBNull' to type 'Date' is not valid
I have this code in DataAccessLayer.vb
Dim NuovaScadenza As New Scadenza(CInt(returnData("IdScadenza")), Cint(returnData("IdImpegno")), Cstr(returnData("Descrizione")), CDate(returnData("DataOriginale"))
but the field DataOriginale often is empty.
In browser it shows this error:
Cast from type 'DBNull' to type 'Date' is not valid
I have tried with .ToString() but don't work.
PLEASE HELP ME!
Try using this.
If Not IsDBNull(returnData("DataOriginale")) Then
' Do something
...Conversion from type 'DBNull' to type 'Date' is not valid.
I'm having a problem with a date time field that is null in the database table in SQL Server when it is retrieved using a 2005 tableadapter strong type data set. I'm trying to set a date control to the null value where the control can handle it but the error (Conversion from type 'DBNull' to type 'Date' is not valid.) occurs from the xsd code. From the data set editor I have an option to change a DefaultValue and it is default to <DBNULL> and it does not let me change it, but also the AllowDBNull property is set to true. I would appreciate ...Conversion from type 'TimeSpan' to type 'Date' is not valid.
I am loading data from a mysql database and when it gest to the ltime field it throws the error. "Conversion from type 'TimeSpan' to type 'Date' is not valid."
The property of my clsLogItem ltime is declared as DateTime. Is there something else I should be declaring it as? Or should I convert the date from the database to something before setting the property equal to it? Public Function GetLog() As List(Of clsLogItem)
Dim log As New List(Of clsLogItem)
Dim conn As New MySqlConnection(Me.ConnectionString)
Dim ...Conversion from type 'Date' to type 'Boolean' is not valid.
I have a DetailsView and a GridView on my page. When the user clicks "Select" on the GridView, the DetailsView mode gets set to ReadOnly (the Item Template).However, right now when I click "Select" I am receiving the following error Conversion from type 'Date' to type 'Boolean' is not valid.
unhandled exception occurred during the execution of the current web
request. Please review the stack trace for more information about the
error and where it originated in the code.
Exception Details:...Cast from type 'Field' to type 'String' is not valid
I am getting the error msg on this code...Response.Write(objRSCount("iCount") & " records for " & frmDispOption & " '" & frmText & "'. They are listed below:")I have tried converting the frmDispOption and frmText variables to strings using CStr after getting the values from the DB but still get the same msg. Can someone please help me out, thanks.David.
What is "objRSCount"? ie what type is it?
You also need to make sure that objRSCount("iCount") is string.ThanksMark post(s) as "Answer" that helped youElectronic ScrewWebsite||Blog||Dub@i.net
Hi, i f...Conversion from type 'DBNull' to type 'Date' is not valid.
I have a Date/Time field in an Access DB that was not a required field upon Input.
Hence the following formatting only works when there is a date in the DB row.
<asp:Label ID="Label3" runat="server"
Text='<%# FormatDateTime(DataBinder.Eval(Container.DataItem, “MyLastUpdateDate"),2) %>'
Is there any way I can check in my CodeBehind whether or not there is a Date in the fiel...Conversion from type 'DBNull' to type 'Date' is not valid
I'm using VWD 2005 and have a grid on the page. In that grid, there'sa column that is of date/time type. Nulls are allowed in this column.I'm having problems when trying to edit this date column.I've converted the column to a template and changed theEditItemTemplate from a textbox to a calendar. If a date previouslyexisted for the record being edited, the update action works. If thedate was previously NULL and then a date is chosen via the calendar I get the error.
How do I work around this? Charlie
Here's my code line:<EditItemTemplate>
<asp:Calendar ID="Calendar1" run...Cannot convert type 'type' to 'type'
I am learning all of this, so I am still fresh, so please bear with me :)I have a page that has some txtboxes in it, simple registration form, and I have a button that will save those txt boxes to the db. I am using:- I am using Visual Web Developer 2008 Express Edition- C# When I try to compile the project I get error: Cannot convert type 'System.Web.UI.WebControls' to 'String' This is content of my web.config <profile>
<add name="LasttName"/>...Type mismatch for field 'FieldName', expecting: AutoInc actual: LongWord
I get this error message with AnyDAC (FireDac) components.
To show my error, I reduce my mysql table to the minimum.
I have two MySQL table who contains many fields of type (string, integer, datetime etc...).
The first table named "ReportLog" contain three fields:
'ID' (INTEGER AutoIncrement)
The second table named "OperatorLog" contain two fields:
'OperId' (INTEGER AutoIncrement)
I put a TFDQuery (na...''''''''''''''''''''
Product: Gran Paradiso Alpha 8
Browser Details: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9a1) Gecko/20061204 UGES/188.8.131.52 GranParadiso/3.0a1
From URL: http://www.mozilla.org/projects/granparadiso/
Note to readers: Hendrix gives...Conversion from type 'DBNull' to type 'Date' is not valid #2
I am using a MySQL database (where the date is stored in the format YYYY-MM-DD).Therefore in order for the date to be displayed to the user in the desired British format (DD/MM/YYYY) i am utilizing the following code<%# CType(DataBinder.Eval(Container.DataItem, "mydate"), DateTime).ToString("dd/MM/yyyy") %> However, this is clearly problematic where the 'mydate' field is NULL resulting in the error messageConversion from type 'DBNull' to type 'Date' is not valid Does anyone know a way round this? Any help would be appreciated&n...Error:Cast from type 'DBNull' to type 'Date' is not valid
I tried to insert a null date of birth value to SQL Server table, the datatype is smalldatetime in the table. I found it insert 1/1/1900 instead of null value. So I am trying to fix it by the following way:
In the first .aspx page, I stored DOB in a session value:
If txtDOB.Text = Nothing Then Session("DOB") = DBNull.Value Else Session("DOB") = txtDOB.Text End If
In the 2nd .aspx page, I get the value by: Dim Birthday As Date = CDate(Session("DOB"))
However, I got an error message :System.InvalidCastException: Cast fro...