Can I Check For Null Reference Before Referencing ReportItems?

Feb 4, 2008

A report I maintain has an extensive footer that appears on each page, populated with information I've stashed into invisible cells in the table's header. This works great, except in rare circumstances where the report includes a page that doesn't display the table at all--in which case the report errors when it attempts to print ("Object reference not set to an instance of an object").

Due to the requirements of the report, I cannot guarantee that the table will appear on every page, every time. Is there a way I can safely refer to the reportItems collection, in case of Nulls? I'll be okay with blank values in the footer in the cases where the page has no reportItems to work with, but I can't have the report blow up when printing.

Thanks in advance,
Jeff Lautenschlager

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CHECK Constraint - Referencing Another Column

Aug 31, 2000

I receive the following error when creating a CHECK constraint that references another column. According to the good old Wrox SQL Server book, I'm using the correct syntax. Anyone have any ideas???

Thanks in advance!

Server: Msg 8141, Level 16, State 1, Line 1
Column CHECK constraint for column 'end_date' references another column, table 'Session'.

Here's an example of the script that I'm using:
CREATE TABLE Session (
session_key char(18) NOT NULL,
course_key char(18) NOT NULL,
site_key char(18) NOT NULL,
instructor_key char(18) NOT NULL,
start_date smalldatetime NULL,
end_date smalldatetime NULL
CHECK (end_date >= start_date)
)


.

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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.

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Is it possible through SSRS designer?

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Jun 11, 2015

CREATE TABLE PRODUCT_SALES
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Productid BIGINT
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INSERT INTO PRODUCT_SALES (Salesmanid,Productid) VALUES (1,1)
INSERT INTO PRODUCT_SALES (Salesmanid,Productid) VALUES (1,2)
INSERT INTO PRODUCT_SALES (Salesmanid,Productid) VALUES (1,3)

SELECT * FROM PRODUCT_SALES

/* SalesmanID is reference key from Sales Master and ProductID is reference key from Product Master. How should i restrict user through DB with any constraint check, if user tries to enter

INSERT INTO PRODUCT_SALES (Salesmanid,Productid) VALUES (1,2),

It should throw error , if possible user defined message would be more useful.

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For example, the table below, has a foreign key (ManagerId) that points to EmployeeId (primary key) of the same table.
-------Employees table--------
EmployeeID  . . . . . . . .  .  .  int
Name  .  .  .  .  .  .  .  .  .  .  .  nvarchar(50)
ManagerID  . . . . . . . .  .  .  .  int
 
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How can that be achieved?

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Mar 12, 2007

Dear all,

I am running into a null reference exception on replication with SQL Server 2005 Compact Edition. The problem occurs at repl.synchronize(). Even though the statement is inside a try-catch block, the exception is not caught, and the application quits.

Device O/S: Windows Mobile 5.0 v 5.1.195 Build 14957.2.3.1
Hardware: Dell Axim X51v, Intel PXA270
Database: SQL 2005 SP2 (no post SP2-patches)

Exception shows as "an unexpected error has occured in AppName.exe. Select Quit and then restart this program, or select Details for more information." Details:
.. at NullReferenceException at AppName.Form1.Synch()
.. at .... (various lines)
.. at AppName.Form1.Main()

The application is based on the tutorial (Creating a Mobile Application with SQL Server Compact Edition) at http://msdn2.microsoft.com/en-us/library/ms171908.aspx.

The application was successfully working initially but then stopped working on replication after some minor modifications which were not related to the replication code, e.g. adding some buttons to the form.

Three things are puzzling me here..

1. The fact that this is a NullReferenceException and not a SqlCeException
2. Why the try-catch block doesn't work
3. Why the exception occurs

Is this a bug or am I doing something wrong here?

Any help would be appreciated.



Code sample below:

Sub Synch()
Try
LogMsg("Deleting db...")
DeleteDB()
LogMsg("Initializing repl...")
Dim repl As New SqlCeReplication
repl.InternetUrl = http://192.168.0.100/SQLMobile/sqlcesa30.dll
repl.Publisher = "TRKSRV"
repl.PublisherDatabase = "trk_db"
repl.PublisherSecurityMode = SecurityType.NTAuthentication
repl.Publication = "Trk"
repl.Subscriber = "Trk"
repl.SubscriberConnectionString = "Data Source=""Program FilesTrk2007DefectTrk.sdf"";Max Database Size=128;Default Lock Escalation =100;"
LogMsg("Adding subscription...")
repl.AddSubscription(AddOption.CreateDatabase)
LogMsg("Synch...")
repl.Synchronize()
LogMsg("Cleanup...")
repl = Nothing
Catch err As SqlCeException
MessageBox.Show(err.ToString & " " & err.HResult & " " & err.NativeError & " " & err.Message & " " & err.InnerException.ToString)
Catch err2 As Exception
MessageBox.Show(err2.ToString & " " & err2.Message.ToString & " " & err2.InnerException.ToString)
End Try
End Sub

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Can anyone tell me why the machine.config file would be referenced instead of my app.config file and how I can stop it from doing this?

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Apr 17, 2008

Hi
       I have two tables. one  MasterDetail and second is countrydetail
In master detail i have MasterDetailId (Primary) and  countryId.
In CountryDetail table I have Countrid (Primary),CountryName.
I don't want to give relationship because i can insert null value in countryid in MasterDetail table.
So i have wriiten query like this
->     select c.CountryName,m.MasterDetailId from MasterDetail m,CountryDetail c where c.CountryId=m.CountryId and m.MasterDetailId= '2'
If In MasterDetail table if CountryId is null then it will not show me any record. So I want that  record and its value with this query and checking null values. Help me about solving this query.
Thank You
 

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Mar 11, 2008

I am trying to create a stored proc.
I have to check a parameter for null value and if null then set it to zero
Here is the stored proc
set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
go
ALTER PROCEDURE [dbo].[UPDATENOA]
(
@Accepted char(10),
@NOAId bigint,
@Court char(30),
@RetainerType char(30),
@PendingInTaxCourt char(1)
)
AS
begin
UPDATE NOA set StageCode = Accepted,Court=@Court,RetainerType=@RetainerType,PendingInTaxCourt=@PendingInTaxCourt where NOAId = @NOAId;
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Select @Sequence = MAX(Sequence) From [dbo].[NOAStages] where NOAId=@NOAId;
if @Sequence IS NULL
{
@Sequence=0
}
Insert into [dbo].[NOAStages] (NOAId,StageCode,Sequence)
values (@NOAId,@Accepted,@Sequence+1)
But this is giving me error. What is the correct way to do this.
Thanks

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Jun 20, 2007

the SQL string below worked, and then started bringing up every record.
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"SELECT id, make, model FROM vehicles WHERE workToBeDone1 IS NOT NULL OR workToBeDone2 IS NOT NULL OR workToBeDone3 IS NOT NULL OR workToBeDone4 IS NOT NULL OR workToBeDone5 IS NOT NULL"

Any ideas how I could implement this more robustly?
cheers
M

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Apr 14, 2015

Content table

deleteddate revokeddate
1/1/2001 null
null 2/2/2003
4/5/2004 null

I am trying to create a stored procedure where.I need to loop through every row of the table and check if there exists a date in either of the column. If date exists in either of the column for every row, I need to update some other stuff.For the above table, it meets my requirement, so I need to update. However if the table is as below, it doesn't meet the requirement, so I don't need to update

deleteddate revokeddate
1/1/2001 null
null null
4/5/2004 null

I started off as below, But I am getting incorrect values.

Declare @deleterevoke bit
Declare @DelRevId int
Declare @DelRevnumrows int
Declare @tempDeletedDate datetime
Declare @tempRevokedDate datetime

[code]....

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Jul 2, 2007

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declare @number int

set @number = (select number from numbers where number_id = 1)

if (@number = null)
begin
set @number = 12
end

Thank you very much

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Aug 23, 2007

Okay, I have the following statement for my store procedure:



Code Snippet
IF exists (SELECT [ID], [title], [name], [issueID] FROM [Outlook] WHERE ([issueID] = @OLissueID))
SELECT [ID], [title], [name], [issueID] FROM [Outlook] WHERE ([issueID] = @OLissueID)
ELSE
SELECT null ID, 'No parent page yet' title FROM Outlook






I wanted to put an ELSE IF statement right before the ELSE statement to check if the value is null. Something like this:


IF exists (SELECT [ID], [title], [name], [issueID] FROM [Outlook] WHERE ([issueID] = @OLissueID))


SELECT [ID], [title], [name], [issueID] FROM [Outlook] WHERE ([issueID] = @OLissueID)
ELSE IF (SELECT [ID], [title], [name], [issueID] FROM [Outlook] WHERE ([issueID] = @OLissueID) != null


SELECT [ID], [title], [name], [issueID] FROM [Outlook] WHERE ([issueID] = @OLissueID)

ELSE


SELECT null ID, 'No parent page yet' title FROM Outlook


Or if this is possible, it's much better:


IF exists (SELECT [ID], [title], [name], [issueID] FROM [Outlook] WHERE ([issueID] = @OLissueID) AND (SELECT [ID], [title], [name], [issueID] FROM [Outlook] WHERE ([issueID] = @OLissueID) != null)


SELECT [ID], [title], [name], [issueID] FROM [Outlook] WHERE ([issueID] = @OLissueID)

ELSE


SELECT null ID, 'No parent page yet' title FROM Outlook

I don't quite get how to write the SQL statement that I wanted so any help is much appreciated.

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Aug 20, 2006

I am using Visual Web Developer Express 2005 and SQL Server Express 2005.
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I am now trying to find a way to check if null values exist in either one of two field from the same table.  If either field contains a null value, then I don't want the trigger code to be executed.
How can I check for null values and skip a block of code within my Transact Sql trigger.
Thanks.....

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BEGIN
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END
ELSE
BEGIN
print 'I am empty'
ENd

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Mar 13, 2014

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[SumValue] = SUM([CurrentYear]/4),
[ActualValue] = SUM([Variance] * 0.75),
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I am struggling to write this condition. Without condition i.e. at present it saves the value in this database '1753-01-01 00:00:00.000'.
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Aug 5, 2015

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What is happening is the query in the report dataset is adding dates when it should be displaying empty. They query is using "CASE/WHEN/THEN". What I need is "When the column is "RecievedDate" and it is not null then convert it to a date". This is for formatting purposes.

This is an example of the table:

UpdateColumn
Old Value
New Value
ReceivedDate
 7/8/2015 5:00:00 AM
ReceivedDate
7/8/2015 12:00:00 AM
7/9/2015 5:00:00 AM
ReceivedDate
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This is the query:

CASE UpdateColumn
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...
I tried adding
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...
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...

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Code:


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BEGIN
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When i execute this, I am getting below error.

Could not deploy package.

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Example Data

create table test
(
ID int,
set1 varchar(50),
set2 varchar(50),

[code]....

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Budget
Current Spent
YTD Spent







4100
EMPLOYEES
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4105
EMPLOYEES - TEMPORARY
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4200
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