How To Handle Null Value?

Oct 16, 2006

My way:

add column (boolean) to speicify whether is null or not in drived column component, i feel that's a little difficult

any better ideas? thanks



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Null How To Handle

Jul 23, 2005

I already asked this question; however, I am giving all the detailsnow:We get large files(millions of records) and we need to load it into ourtables using import export wizard. Some of the fields in the file canbe Null and so we are forced to create table with fields that allowNulls with default ''. However when we insert data into these tablesit puts Null in those fields even though we have a default '' (I do notthink we have any work around for that; do we?)Finally we need to go through each field and update it to '' if it is aNull and that takes LOT OF TIME.If (select count (*) from <tablename> where <columname> is Null) >0BeginUpdate <tablename>set <columnName> = ''where <columnName> is NullendPlease let me know if there are any work arounds for this crisis ?Thank you very much in advance!

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Handle Null Value For DropDownList?

Nov 11, 2006

Using asp.net 2.0 and visual studio 2005. The question is regarding the following ER diagram: I've made Firstname, lastname, buildingID and RoomNum all required fields. I've got a modified GridView that displays all of the table Faculty columns.  It's been modified so the BuildingID and DepID are resolved to their actual field names and displayed in a DropDownList.  In the dropdown list I used for inserting (a seperate DetailsView control), I manually inserted an item into the Department dropdownlist which had the text "-- Select a Department --" with a value of -1.  MS SQL didn't like that -1 value so I wrote the following code to fix it:  protected void dsFaculty_Inserting(object sender, SqlDataSourceCommandEventArgs e)
{
if (e.Command.Parameters["@DeptID"].Value.ToString() == "-1")
{
e.Command.Parameters["@DeptID"].Value = null;
}
} That means of course DeptID is null, which is ok.  The problem arises is when I try to edit that row in the GridView.  I get the an error 'ddlDepartment' has a SelectedValue which is invalid because it does not exist in the list of items.Parameter name: valueIdeally, I'd like to make the dropdown list in the GridView show "-- None --" for the DeptID if it comes across a null value.  I already tried playing around with the Command.Parameters in the dsFaculty_Selected function, but it didn't work.  Ideas? 

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May 15, 2007

Hi all I am trying to populate a page with data from a SQL DB however one field is null. The problem is this is causing a StrongTypingException and I am not sure how I should handle this to stop the apllication crashing. I am trying to assign a bit value from a SQL Db to checkboxI have tried putting if (Convert.IsDBNull(contentRow.pag_status) == false){//Do what I want}
but this still throws the exception
 Can anyone help!?

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Mar 19, 2008

Re: SQL Server Reporting Services

I have welders who have active dates and inactive dates, and I need to create an "isactive" column in the report. My formula will be pretty obvious to most of you. However, if the user does not input an inactive date, that means none has been given and therefore the welder is currently active. The problem is that there seems to be no way to check if inactive date is null or not in the formula.

Please help! Thanks!

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Handle Null Date Values

Feb 19, 2008



Hi,
In my Excel file, The Application date column contains empty for some rows. In SSIS I am using one Data Conversion to that Application Date column to change it as Date[dt_Date]. This data conversion is giving error Conversion failed. In Sqlserver table, I declare ApplicationDate column datatype as DateTime.
I want to keep those empty date values as Null in Sqlserver.
I tried the IMEX=1 property still it is not working. How to solve this error?

Thanks in advance.

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Thanks! in advance.

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Aug 17, 2005

If myDateTimeColumn contains a <NULL> value.  How do you handle that when reading into a DateTime object in your code?DateTime myDate = Convert.ToDateTime(dr["myDateTimeColumn"]);Does not work, it throws: System.InvalidCastException: Object cannot be cast from DBNull to other types.
I am curious as to what others are doing to handle this?

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I have a checkbox on my webform that is bound to a bit field in my SQL table. I'm fine as long as I've got the bit field set to 0 or 1, but if the field is NULL, the checkbox throws an exception during the databind.

Is there any way to handle this without removing the data binding and manually setting the value (ie: some way to intercept it before the exception gets thrown and then setting the field value in the dataset)?

Thanks!

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Error Log Peppered With --&&> 'The Conversation Handle Is Missing. Specify A Conversation Handle.'

Dec 3, 2007

Hi

I'm using service broker and keep getting errors in the log even though everythig is working as expected

SQL Server 2005
Two databases
Two end points - 1 in each database
Two stored procedures:
SP1 is activated when a message enters the sending queue. it insert a new row in a table
SP2 is activated when a response is sent from the receiving queue. it cleans up the sending queue.

I have a table with an update trigger
In that trigger, if the updted row meets a certain condition a dialogue is created and a message is sent to the sending queue.
I know that SP1 and SP2 are behaving properly because i get the expected result.
Sp1 is inserteding the expected data in the table
SP2 is cleaning up the sending queue.

In the Sql Server log however i'm getting errors on both of the stored procs.
error #1
The activated proc <SP 1 Name> running on queue Applications.dbo.ffreceiverQueue output the following: 'The conversation handle is missing. Specify a conversation handle.'

error #2
The activated proc <SP 2 Name> running on queue ADAPT_APP.dbo.ffsenderQueue output the following: 'The conversation handle is missing. Specify a conversation handle.'

I would appreceiate anybody's help into why i'm getting this. have i set up the stored procs in correctly?

i can provide code of the stored procs if that helps.

thanks.

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Conversation Handle Reuse And Conversation Handle XXX Not Found

Jan 18, 2008



We have implemented our service broker architecture using conversation handle reuse per MS/Remus's recommendations. We have all of the sudden started receiving the conversation handle not found errors in the sql log every hour or so (which makes perfect sense considering the dialog timer is set for 1 hour). My question is...is this expected behavior when you have employed conversation recycling? Should you expect to see these messages pop up every hour, but the logic in the queuing proc says to retry after deleting from your conversation handle table so the messages is enqueued as expected?

Second question...i think i know why we were not receiving these errors before and wanted to confirm this theory as well. In the queuing proc I was not initializing the variable @Counter to 0 so when it came down to the retry logic it could not add 1 to null so was never entering that part of the code...I am guessing with this set up it would actually output the error to the application calling the queueing proc and NOT into the SQL error logs...is this a correct assumption?

I have attached an example of one of the queuing procs below:




Code Block
DECLARE @conversationHandle UNIQUEIDENTIFIER,
@err int,
@counter int,
@DialogTimeOut int,
@Message nvarchar(max),
@SendType int,
@ConversationID uniqueidentifier
select @Counter = 0 -- THIS PART VERY IMPORTANT LOL :)
select @DialogTimeOut = Value
from dbo.tConfiguration with (nolock)
where keyvalue = 'ConversationEndpoints' and subvalue = 'DeleteAfterSec'
WHILE (1=1)
BEGIN
-- Lookup the current SPIDs handle
SELECT @conversationHandle = [handle] FROM tConversationSPID with (nolock)
WHERE spid = @@SPID and messagetype = 'TestQueueMsg';
IF @conversationHandle IS NULL
BEGIN
BEGIN DIALOG CONVERSATION @conversationHandle
FROM SERVICE [InitiatorQueue_SER]
TO SERVICE 'ReceiveTestQueue_SER'
ON CONTRACT [TestQueueMsg_CON]
WITH ENCRYPTION = OFF;
BEGIN CONVERSATION TIMER ( @conversationHandle )
TIMEOUT = @DialogTimeOut
-- insert the conversation in the association table
INSERT INTO tConversationSPID
([spid], MessageType,[handle])
VALUES
(@@SPID, 'TestQueueMsg', @conversationHandle);

SEND ON CONVERSATION @conversationHandle
MESSAGE TYPE [TestQueueMsg] (@Message)

END
ELSE IF @conversationHandle IS NOT NULL
BEGIN
SEND ON CONVERSATION @conversationHandle
MESSAGE TYPE [TestQueueMsg] (@Message)
END
SELECT @err = @@ERROR;
-- if succeeded, exit the loop now
IF (@err = 0)
BREAK;
SELECT @counter = @counter + 1;
IF @counter > 10
BEGIN
-- Refer to http://msdn2.microsoft.com/en-us/library/ms164086.aspx for severity levels
EXEC spLogMessageQueue 20002, 8, 'Failed to SEND on a conversation for more than 10 times. Error %i.'
BREAK;
END
-- We tried on the said conversation, but failed
-- remove the record from the association table, then
-- let the loop try again
DELETE FROM tConversationSPID
WHERE [spid] = @@SPID;
SELECT @conversationHandle = NULL;
END;

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Problem With Isnull. Need To Substitute Null If A Var Is Null And Compare It To Null And Return True

Sep 20, 2006

Hey. I need to substitute a value from a table if the input var is null. This is fine if the value coming from table is not null. But, it the table value is also null, it doesn't work. The problem I'm getting is in the isnull line which is in Dark green color because @inFileVersion is set to null explicitly and when the isnull function evaluates, value returned from DR.FileVersion is also null which is correct. I want the null=null to return true which is why i set ansi_nulls off. But it doesn't return anything. And the select statement should return something but in my case it returns null. If I comment the isnull statements in the where clause, everything works fine. Please tell me what am I doing wrong. Is it possible to do this without setting the ansi_nulls to off??? Thank you

set ansi_nulls off


go

declare

@inFileName VARCHAR (100),

@inFileSize INT,

@Id int,

@inlanguageid INT,

@inFileVersion VARCHAR (100),

@ExeState int

set @inFileName = 'A0006337.EXE'

set @inFileSize = 28796

set @Id= 1

set @inlanguageid =null

set @inFileVersion =NULL

set @ExeState =0

select Dr.StateID from table1 dR

where

DR.[FileName] = @inFileName

AND DR.FileSize =@inFileSize

AND DR.FileVersion = isnull(@inFileVersion,DR.FileVersion)

AND DR.languageid = isnull(@inlanguageid,null)

AND DR.[ID]= @ID

)

go

set ansi_nulls on

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Reporting Services :: Give Meaning Full Name To Allow Null Value Check Box In Report Parameter Instead Of NULL?

Oct 20, 2015

In my report i have CNAME parameter , which allows null value. I checked Allow null value check box in report parameter properties.

when i preview the report , it displays checked NULL check box beside CNAME parameter . I want to give some meaningful name(i.e.ALLCustomers) to this checkbox instead of NULL. 

Is it possible through SSRS designer?

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Jul 15, 2015

I have a flat file with the following columns

SampleID   Rep_Number   Product  Protein   Fat   Solids

In the flat file SampleID and Product are populated in the first row only, rest of the rows only have values for Rep_Number, Protein, Fat, Solids.

SampleID and Product are blank for the rest of the rows. So my task is to fill those blank rows with the first row that has the sampleID and Product and load into the table.

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Subscription Issue With Null Default Parameter - Key Cannot Be Null

May 3, 2007

I have a report that is run on a monthly basis with a default date of null. The stored procedure determines the month-end date that it should use should it be sent a null date.

The report works fine when I tell it to create a history entry; however, when I try to add a subscription it doesn't appear to like the null parameter value. Since I have told the report to have a default value of null it doesn't allow me to enter a value on the subscription page.

Now, I suppose I could remove the parameter altogether from the stored proc, but then the users would never be able to run the report for a previous time period. Can someone explain to me why default values aren't allowed to be used on subscriptions when they seem to work fine for ad hoc and scheduled reports? This is really quite frustrating as most of my reports require a date value and default to null so that the user doesn't have to enter them for the latest data.



An internal error occurred on the report server. See the error log for more details. (rsInternalError) Get Online Help




Key cannot be null. Parameter name: key

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Returned SQLParam.SqlValue Is {Null} But Can't Test For Null?

Nov 5, 2007

I run a stored procedure for which I have a return variable. The stored procedure returns the ID of a row in a table if it exists:

m_sqlCmd.ExecuteScalar();

The m_sqlCmd has been fed an SQLParameter with direction set to output.
When the stored proc returns, I want to test it. Now when there IS a row it returns the ID ok.
When the row doesn't exist, in my watch I have:

m_sqlParam.SqlValue with value {Null}

I can't seem to work out how to test this value out.
I've tried several things but none seem to work.

This line compiles ok, but the following runs into the IF statement as if the SqlValue is null??

if (m_sqlParam.SqlValue != null)....
{

// I'm here!! I thought the watch says this is null???
}

Sorry if this is obvious, but I can't work this one out!!

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Any Improvements To This: Cannot Apply Value Null To Property Login: Value Cannot Be Null.

Mar 26, 2007

Looks like there was a fix and then I read this fix is not a fix. Does anyone know how this can be rectified? Does it mean that only Windows authentiation is the only way it works. The Software is over 2 years old, there are no excuses.

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Is There A Better Way To Handle This IF..ELSE IF?

Mar 30, 2004

Do I have other option beside using IF..ELSE IF? TIF



-- GET INFORMATION OF THE JOB
DECLARE @JOBIDAS Char(10)
DECLARE @VRUSERVICEHRSAS Decimal(18,2)
DECLARE @VRUSERVICEMINAS Decimal(18,2)
DECLARE @BILLEDFLATAS Decimal(18,2)
DECLARE @BILLREGRATEAS Decimal(18,2)
DECLARE @MIN_HRSAS Decimal(18,2)

DECLARE @COUNT_GREATER_MINTinyInt
DECLARE @COUNT_LESS_MINTinyInt

SET @VRUSERVICEMIN = 46
SET @BILLEDFLAT = 0
-- PROCESS ONLY RECORDS WHERE THERE IS NO FLAT FEE
IF @BILLEDFLAT = 0
BEGIN
IF @VRUSERVICEMIN BETWEEN 0 AND 15
BEGIN
SET @VRUSERVICEMIN = .25
END
ELSE IF @VRUSERVICEMIN = 15
BEGIN
SET @VRUSERVICEMIN = .25
END
ELSE IF @VRUSERVICEMIN BETWEEN 15 AND 30
BEGIN
SET @VRUSERVICEMIN = .5
END
ELSE IF @VRUSERVICEMIN = 30
BEGIN
SET @VRUSERVICEMIN = .5
END
ELSE IF @VRUSERVICEMIN BETWEEN 30 AND 45
BEGIN
SET @VRUSERVICEMIN = .75
END
ELSE IF @VRUSERVICEMIN = 45
BEGIN
SET @VRUSERVICEMIN = .75
END
ELSE IF @VRUSERVICEMIN > 45
BEGIN
SET @VRUSERVICEMIN = 1
END
END

PRINT @VRUSERVICEMIN

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Cannot Insert The Value NULL Into Column 'OrderID' -- BUT IT IS NOT NULL!

Apr 2, 2007

I am getting this error: "Cannot insert the value NULL into column 'OrderID', table 'outman.outman.Contact'; column does not allow nulls. INSERT fails." -- But my value is not null. I did a response.write on it and it show the value. Of course, it would be nice if I could do a breakpoint but that doesn't seem to be working. I'll attach a couple of images below of my code, the error, and the breakpoint error.
 

 
 

Server Error in '/' Application.


Cannot insert the value NULL into column 'OrderID', table 'outman.outman.Contact'; column does not allow nulls. INSERT fails.
Description: An 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: System.Data.SqlClient.SqlException: Cannot insert the value NULL into column 'OrderID', table 'outman.outman.Contact'; column does not allow nulls. INSERT fails.Source Error:



Line 89: sContact.Phone = sPhone.Text.Trim
Line 90: sContact.Email = sEmail.Text.Trim
Line 91: sContact.Save()
Line 92:
Line 93: Dim bContact As Contact = New Contact()Source File: F:InetpubwwwrootOutman KnifeCheckout.aspx.vb    Line: 91 Stack Trace:



[SqlException (0x80131904): Cannot insert the value NULL into column 'OrderID', table 'outman.outman.Contact'; column does not allow nulls. INSERT fails.]
System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection) +857354
System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) +734966
System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj) +188
System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj) +1838
System.Data.SqlClient.SqlDataReader.HasMoreRows() +150
System.Data.SqlClient.SqlDataReader.ReadInternal(Boolean setTimeout) +214
System.Data.SqlClient.SqlDataReader.Read() +9
System.Data.SqlClient.SqlCommand.CompleteExecuteScalar(SqlDataReader ds, Boolean returnSqlValue) +39
System.Data.SqlClient.SqlCommand.ExecuteScalar() +148
SubSonic.SqlDataProvider.ExecuteScalar(QueryCommand qry) +209
SubSonic.DataService.ExecuteScalar(QueryCommand cmd) +37
SubSonic.ActiveRecord`1.Save(String userName) +120
SubSonic.ActiveRecord`1.Save() +31
Checkout.btnCheckout_Click(Object sender, EventArgs e) in F:InetpubwwwrootOutman KnifeCheckout.aspx.vb:91
System.Web.UI.WebControls.Button.OnClick(EventArgs e) +105
System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +107
System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +7
System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +11
System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +33
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +5102



Version Information: Microsoft .NET Framework Version:2.0.50727.42; ASP.NET Version:2.0.50727.42

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The statement has been terminated.

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May 3, 2006

Hello.

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AS
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Case 
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