Testing For Null Dataset
Dec 11, 2007
Hi All,
I need to find out how I can detect a NULL dataset at runtime. I have just released my first report using SQLServer Reporting services and all went well until I had an empty dataset on the server. There was no problem ever on my development system, running under Visual Studio 2005 Pro, even if I got no data back. Shortly after release to the server though I found that the report reported javascript errors. After a lot of searching I nailed it down to my code that alternated the background color of the rows in the report. The code looks like this:
=iif( RowNumber("DataRecords") Mod 2, "WhiteSmoke", "White")
I had this line in the BackGround property for my table row. It works great, unless DataRecords is Null and RowNumber is 0. I ended up taking the expression out, because I could not find a way to test if DataRecords was null or RowNumber was 0, without getting a compiler error.
Can anyone here tell me what I need to do so I can put that expression back in and alternate the color of my data rows again? I get the data using a stored procedure, if that matters.
TIA
URW
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Aug 10, 2007
Hi
I really need your help. I’ve got a table with 4 columns – username (a string of text), dateTime (a date and time), duration (time in minutes), roomID (URL). I really need some help with writing up some code behind to check if a user has permission to continue. I’ve got the first bit, but I need help with collecting the data and testing it:
SqlConnection conn = new SqlConnection(Global.ConnectionString); SqlCommand cmd = new SqlCommand("select * from tblActiveSession where Username=@Username", conn);
SqlParameter paraUsername = cmd.Parameters.Add("@Username", SqlDbType.NVarChar); paraUsername.Value = this.txtUsername.Text;
try { conn.Open()
This is where I need the help. What I need is to test each row against the following:
If now() is within the allowed time frame – greater than dateTime, but less than dateTime + duration, then break the loop and redirect to roomID.
I really hope this makes sence, and I’m greatful for any help.
Many thanksRichard
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Mar 31, 2008
Hi,How do I write a query where if a column, "value," is NULL I returnthe phrase "No value entered" but otherwise return the column's value,even if it is the empty string? I'm tried to modify this simple querySELECT value FROM meta_dataThanks, - Dave
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Jan 27, 2005
I'm sure that I'm being stupid but this is driving me nuts. The case statements in the following query always return the ELSE and never return the THEN for the NULL.
Code:
select day(ums_users.created), count(*) as Total,
SUM(CASE ums_user_info.info_key WHEN NULL THEN 1 ELSE 0 END) AS UnReg,
SUM(CASE ums_user_info.info_key WHEN NULL THEN 0 ELSE 1 END) AS Reg
from ums_users
left join ums_user_map
on ums_users.user_id = ums_user_map.user_id
left join ums_groups
on ums_user_map.group_id = ums_groups.group_id
left join ums_user_info
on ums_user_info.user_id = ums_users.user_id
where (ums_groups.group_id = '43A73FAE-0C2C-4ED8-BE1E-B32C12DB163D'
or ums_groups.group_parent_id = '43A73FAE-0C2C-4ED8-BE1E-B32C12DB163D')
AND year(ums_users.created) = '2005' and month(ums_users.created) = '01'
GROUP BY day(ums_users.created)
ORDER BY day(ums_users.created)
I'd be really grateful if somebody could explain what I'm doing wrong.
TIA
Nick
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Jun 3, 2008
Hi gang,
When reading a record from my SQL database for display on a web form, I am checking for null before I assign the value to a TextBox on the form. Here is an example:
// normal database setup code hereSqlDataReader rdr = cmd.ExecuteReader();if (!Convert.IsDBNull(rdr["FirstName"])){ txtFirstName.Text = (string)rdr["FirstName"];}// code here for other record fields
Is this the correct way to do this? Is there a simpler way to do this? I am writing a bunch of database code and I want to do it right...
Thanks,Kevin
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May 9, 2007
I am obviously a newbie to SQL Server but have been using Access for years and I have come up against what appears to be an age old issue concerning nulls and specifically the functions to test for them etc.
Below is the Access Query I am having difficulty with...
----------------------------------------------------------
SELECT DISTINCT Max(tbl_ScheduleDate.SchDate) AS CurrentDate, ([SchDate],"mmmm yyyy") AS MonthYear, tbl_Schedule.Area, tbl_Schedule.CP, IIf(IsNull(tbl_tmp_CP.CPID),"Not Uploaded","Uploaded") AS Loaded
FROM (tbl_Schedule INNER JOIN tbl_ScheduleDate ON tbl_Schedule.MaxMinID = tbl_ScheduleDate.MaxMinID) LEFT JOIN tbl_tmp_CP ON tbl_Schedule.CP = tbl_tmp_CP.CP
GROUP BY Format([SchDate],"mmmm yyyy"), tbl_Schedule.Area, tbl_Schedule.CP, IIf(IsNull(tbl_tmp_CP.CPID),"Not Uploaded","Uploaded"), tbl_ScheduleDate.SchDate, tbl_tmp_CP.CPID;
-------------------------------------------------------------
Ignore the Format() function as I know this is a problem and have a fix.
The problem is this field...
IIf(IsNull(tbl_tmp_CP.CPID),"Not Uploaded","Uploaded") AS Loaded
I am testing to see if data is loaded into table 'tbl_tmp_CP' that is related to 'tbl_Schedule' by checking if there is a null value or not and then adding the right response string value to a column called Loaded.
Can anyone suggest a way for me to do the above?
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Feb 11, 2005
I keep getting "Value cannot be null. Parameter name: dataSet" when I run this statement and bind it to a dataset using a sqldataadapter in ASP.NET using VB.NET.
"SELECT playerstats.playerid, playerstats.gameid, SUM(playerstats.fta), SUM(playerstats.ftm), SUM(playerstats.tpm), SUM(playerstats.rb), SUM(playerstats.fga), SUM(playerstats.fgm), SUM(playerstats.tp), SUM(playerstats.st), SUM(playerstats.a), 100(SUM(playerstats.fgm)/SUM(playerstats.fga)) AS fgp, player.playerid, player.lname + ', ' + player.fname AS fullname FROM playerstats, player WHERE playerstats.playerid = player.playerid AND player.leagueid = " & ddlLeague.SelectedValue & " ORDER BY " & strSortField
I know there is data in the db.
Please help :confused:
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Dec 18, 2006
Hello,
I would like to display the first non null value from my dataset, is this possible? I am aware of first() and last() but what are my options for displaying the aforementioned? Thanks much!
John
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Aug 6, 2007
Hi Everyone,
I have a dataset like below
X15ForecastsCounts
X16ActualsCounts
WeekEnding
38
18
7/23/07
38
14
7/30/07
38
35
8/6/07
37
NULL
8/13/07
37
NULL
8/20/07
37
NULL
8/27/07
37
NULL
9/3/07
36
NULL
9/10/07
36
NULL
9/17/07
22
NULL
9/24/07
I am plotting this data set as an S-Curve using the Running Value funtion.
The value and data point value is =RunningValue(Fields!X15ForecastsCounts.Value,Sum,"Series") similar code for X16Actuals Counts.
Unfortunately I am getting the curve like this http://tinypic.com/view.php?pic=4lyiuko
I dont want my X16ActualsCounts to extend beyond 8/6/07 in this case....and next week I dont want it to extend beyond 8/13/07.
How can I fix this issue??
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Apr 13, 2007
Hey All,
I have a number Stored Procs that have been around for a while that pull the entire list, or if I pass an ID, will just the record for that ID like below.
I want to be able to use these querries to poplate Multi-Select parameter dropdowns. going to the Data tab and creating a new dataset, I put in the SP name, and close the window. I then go to the Red ! point to preview the data it prompts me for my ID parmaeter on my SP. In the dropdown list it has '<Null>' (no ' though). When I run it, it works fine and returns all of my records.
When I run the report, it errors saying I didn't pass a parm for ID. I go back to the data tab, and edit my DataSet hitting the elipse. I go to the 3 tab called parameters, and type the following I get the following errors:
@ID = <Null> ---- ERROR - [BC30201] Expression expected
@ID= ---- ERROR - Return statement in function must return a value
@ID = Null -----ERROR - Null constant not supported use System.DBNull instead
@ID = System.DBNull ----ERROR - [BCS30691] DBNull is a type in System and cannot be used in an expression
@ID=System.DBNull.Value --- NO ERROR, but it does not return anything either. I also did a SQL Trace, and I can see that it doesn't even send the querry to the database.
Does anyone know another magic value I can pass to get this to work?
I am being a little stuborn, I know that I could just create new procs, and wrap up the null, but the more stuff you create the more you have to maintain, so I would prefer to reuse these.
Thanks in advance.
Eric Wild
PS: My company is moving from crystal reports to Reporting service, and Reporting services is Rocks! It is very intuitve, simple and straign forward. The formatting is easy with the table and the matrix control blows away the crosstab control in crystal. Also, I'm finding that because crystal was so un extendable, that I would spend hours shaping sql to get over it's blemishes, and hours shaping it in the report, only to sometimes reliaze that the proposed onetime hack wouldn't work, and have to start all over! So far with RSS any tips and tricks I have learned can very easily be applied to any report I work on! Aslo, I do mostly interanet web apps, and it is nice to dump my reports on the Report Server, and not worry about haing to create a web page, create a datasource and all the ansilary stuff to go along with it. The only thing I don't like is the name 'Roporting Services': It does not stick out too far in Google Searches like 'AJAX.NET' or 'ASP.NET'. Anyway kudoes to the Reporting Services team!
ALTER PROC [dbo].[spGetLaborRole]
@ID INT = NULL
AS
BEGIN
SELECT ID, Descr
FROM dbo.LaborRole
WHERE ( (ID = @ID) OR (@ID IS NULL) )
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Feb 6, 2007
Do I have to use condition split?, then union all?
if in script, I can use update from <tablename> Set column = isnull(column, 'NA'). It's so simple.
I'm also wondering can we run SQL Script against input dataset in a SSIS component?
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Sep 6, 2007
HI,
I am using XmlDataDocuments returned by webservices and query in the reports to populate the reports.
The issue I have is if the dataset used to populate the XML document has any nulls or empty spaces in any field the whole column or row is missing in the data generated by my query in the Reports. Sometimes the whole data is not being returned to the reports.
Sample query I use
<Query>
<SoapAction>http://xxxx.webservices.org/SelectReportRegisters</SoapAction>
<Method Namespace="http://xxxx.webservices.org/" Name="SelectReportRegisters">
<Parameters>
<Parameter Name="p_registerType">
<DefaultValue>All</DefaultValue>
</Parameter>
<Parameter Name="p_registerName">
<DefaultValue>All</DefaultValue>
</Parameter>
<Parameter Name="p_asOfDate">
<DefaultValue>7-1-2009</DefaultValue>
</Parameter>
</Parameters>
</Method>
</Query>
I have tested the webservice with sample data and it works well, returns data.
I use the ISNULL() in my stored procedures to avoid nulls but with empty strings, replacing them with a default value in the managed code is expensive and slows down the reports.
Is there some feature I am missing because of which nulls and empty strings are causing this problem.
I am using Reporting services 2005.
Any pointers will be truly appreciated.
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Jun 6, 2008
I have a table adapter for one of my SQL2005 tables, and in two different fields I accept a date time. Now 99% of the times, new rows to this table will be filled out using DateTIme.Now(), as a Time Stamp is what I'm going for.
Here is the line of code in question...cops_current_data_adapter.Insert(ProductOrder, Convert.ToInt16(Session["StationId"].ToString()),
PartNumber, DateTime.Now, DateTime.Now, Convert.ToInt16(qty), 0);
The second DateTime.Now is the one that can be null, and it's throwing a formatting error everytime I try and drop it in there. It's a FormatException, and there's not much more to the example except unhelpful tips like be careful when conveting a string to a dateTime, which I'm not doing. Needless to say for the code to compile, and then throw a Format error at runtime is a bit frustraiting.
Any suggestions would be most appreciated
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Apr 10, 2007
Hi,
I am starting to use reporting services and I created a report that takes 4 parameters for a Filter on the dataset.
The idea is the create snapshot nightly and then display the report filtered based on parameters to users.
I'd like that the filter be ignored for a parameter if the parameter is passed as NULL,
Right now I defined it this way :
Left =Fields!RegionCode.Value
Operator =
Right =IIF(IsNothing(Parameters!RegionCode.Value),Fields!RegionCode.Value,Parameters!RegionCode.Value)
I do this for the 4 parameters that are passed, if they are null, make then equals to the field.
I was wondering if there is a way to ignore the whole parameter all together, I would guess it'll be faster to execute.
Thanks
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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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May 26, 2015
I have a report with multiple datasets, the first of which pulls in data based on user entered parameters (sales date range and property use codes). Dataset1 pulls property id's and other sales data from a table (2014_COST) based on the user's parameters. I have set up another table (AUDITS) that I would like to use in dataset6. This table has 3 columns (Property ID's, Sales Price and Sales Date). I would like for dataset6 to pull the Property ID's that are NOT contained in the results from dataset1. In other words, I'd like the results of dataset6 to show me the property id's that are contained in the AUDITS table but which are not being pulled into dataset1. Both tables are in the same database.
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Oct 1, 2015
I have a small number of rows in a dataset, Table 1. There is a CLOB on a large dataset, Table 2. They join on a PK. I would like to retrieve this CLOB and add it to the data flow for Table1. In short I want to emulate the following:
Table 1: Small table without CLOB, 10 rows.
Table 2: Large table with CLOB, 10,000,000 rows
select CLOB
from table2
where pk = (select pk from table1)
I want this to return the CLOBs for the small number of rows in Table 1. The PK is indexed obviously so it should be a fast look up.
Table 1 and Table 2 live on different Oracle databases. How do I perform this operation efficiently in SSIS? It seems the Lookup and Merge Join wont do this.
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May 27, 2015
I have a report with multiple datasets, the first of which pulls in data based on user entered parameters (sales date range and property use codes). Dataset1 pulls property id's and other sales data from a table (2014_COST) based on the user's parameters.
I have set up another table (AUDITS) that I would like to use in dataset6. This table has 3 columns (Property ID's, Sales Price and Sales Date). I would like for dataset6 to pull the Property ID's that are NOT contained in the results from dataset1. In other words, I'd like the results of dataset6 to show me the property id's that are contained in the AUDITS table but which are not being pulled into dataset1. Both tables are in the same database.
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May 21, 2007
I found out the data I need for my SQL Report is already defined in a dynamic dataset on another web service. Is there a way to use web services to call another web service to get the dataset I need to generate a report? Examples would help if you have any, thanks for looking
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Oct 12, 2007
Is there any way to display this information in the report?
Thanks
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May 7, 2008
Hi,
I have a stored procedure attached below. It returns 2 rows in the SQL Management studio when I execute MyStorProc 0,28. But in my program which uses ADOHelper, it returns a dataset with tables.count=0.
if I comment out the line --If @Status = 0 then it returns the rows. Obviously it does not stop in
if @Status=0 even if I pass @status=0. What am I doing wrong?
Any help is appreciated.
ALTER PROCEDURE [dbo].[MyStorProc]
(
@Status smallint,
@RowCount int = NULL,
@FacilityId numeric(10,0) = NULL,
@QueueID numeric (10,0)= NULL,
@VendorId numeric(10, 0) = NULL
)
AS
SET NOCOUNT ON
SET CONCAT_NULL_YIELDS_NULL OFF
If @Status = 0
BEGIN
SELECT ......
END
If @Status = 1
BEGIN
SELECT......
END
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Apr 11, 2008
i have two datasets.one dataset have old data from some other database.second dataset have original data from sql server 2005 database.both database have same field having id as a primary key.i want to transfer all the data from first dataset to new dataset retaining the previous data but if old dataset have the same id(primary key) as in the new one then that row will not transfer.
but if the id(primary key) have changed values then the fields updated with that data.how can i do that.
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Dec 19, 2006
Hi,
I have two datasets in my report, D1 and D2.
D1 is a list of classes with classid and title
D2 is a list of data. each row in D2 has a classid. D2 may or may not have all the classids in D1. all classids in D2 must be in D1.
I want to show fields in D2 and group the data with classids in D1 and show every group as a seperate table. If no data in D2 is available for a classid, It shows a empty table.
Is there any way to do this in RS2005?
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Sep 3, 2015
Using this IIF statement:
=CountDistinct(IIF(Fields!Released_DT.Value = Fields!Date2.Value, Fields!Name.Value,
Nothing))
Released_DT = a date - 09/03/2015 or 09/02/2015
Date2 = returns another date value in this case 09/03/2015
What I'm trying to do is: count distinct number of people (Fields!Name.Value) if the Relased_DT = Date2.My IIF statement is returning a zero value.
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Jul 20, 2007
I have a website and database in Access, how do i set it up so i can test it in IIS using SQL server?
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May 21, 2008
I am using SqlServer 2005 Express Edition. I have written a stored procedure that has a transaction to make sure that it rolls back in case of failure. Is there a way to test that the transaction works. I don't now how to cause an error that would cause the transaction to roll back and raise the error with the details of the exception.
Thanks,
laura
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Dec 6, 2005
hello everyone i was hoping to get some help.
i have sql server2000 and iis5.1 running and im using vbscript through asp.
i have a table that has two keys so that together they make a unique key.
so i am trying to test my table in asp so that if there is a duplicate unique key inserted then show an
error...
Can anyone help me?
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Apr 13, 2001
I want to run remote procs from a local - central proc, but don't want to crash my proc if the remote NT Server or SQL Server is not available.
So, I want to test for NT and SQL availability first.
Here's my code.
====================
DECLARE
@DBName varchar(22),
@QueryString NVARCHAR(130),
@Resultsint,
@ResultsTxtvarchar(31)
/* I find the server-dbasename name in a lookup table, and then build dynamic script */
SELECT @DBName = "<SRVRNAME~DBASENAME>"
SELECT @QueryString = N'master..xp_cmdshell "ECHO >'
+ SUBSTRING(@DBName, 1,6)
+ 'pipesqlquery", no_output'
EXEC @Results = sp_executesql @QueryString
SELECT @Results /* <-- testing here.... */
=====================
If the NT / SQL is running, "@Results" should = 0 (success on the ECHO to the PIPE)
If the NT / SQL is NOT running, "@Results" should = 1 (error on the ECHO to the PIPE)
If I test in QA, I get the expected "@Results" values.
If I run the proc, I get "@Results" = 0 for both events, and them my proc fails on the remote proc call if the NT / SQL is NOT running.
I don't know how to write DMO in TSQL to try that.
I have also tried using 'odbcping' too.
HINTS? Better way to test remote NT / SQL is NOT running?
Thanks in advance.
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May 1, 2001
Hi,
Is there anyway to test the loadtesting/Stress testing on SQLSERVER. I wanted to executes a Store procedure with concurrent users.
Thanks
JK
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Dec 24, 2002
Anyone have a tool or script to run to test a SQL server under heavy stress?
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Mar 31, 2004
Hi,
I need help to test person's skills for
knowledge of SQL stored procedures
and DTS
Could someone point on good resources.
Thank you
Alex
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May 7, 1999
i have performed all the steps for the replication there are two problems i encounytring
(i) how to check whether the replication is working or not
(ii) can replication on the subscribing server automatically create the table which publishing server is publshing
(iii)please tell me someother forums for sql server
what my knowledge says that in replication if i modify the data at one place it should automatically be modified in the subscribing server but this thing is also not happening (its not flashing any error message as such)
please tell me what all things i need to do to make sure that everything starts working
waiting for reply
ashish bhatnagar
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Jan 15, 2007
Hi Guyz ,
I'm new to this forum and as well as new to OLAP testing . I would like to know OLAP testing and guidance for SQL server anlaysis services .
I have been trying install SQL server 2000 in my system but it not going through, Can anybody send information how to install SQL server and how to play with sample database.
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