Linq Question: Select Returns A DBNULL For An Integer Column
Feb 21, 2008
I have quite a few tables which allow NULL values. I have to struggle a lot with DBnull Exceptions :|
example: col1,col2,... are all columns of type Integer and possibly NULL.
var query =
from person in table
select new { person.col1, test = (int?) person.col2, person.col3, person.col4, ...};
As soon as my result encounters a DBNull value.. the whole query fails. This is really bad.
How would I return the valid values.. and set the keys where there is no value to a null type? (e.g. int -> 0)
I tried using "(int?)" but I'm not *really* sure what it does :-) Anyway.. it has no effect :-)
Ok well i have a stored procedure that returns an integer between 1 and 5. My problem now is i want to check to see if the table will return NULL and if so i don't want to assign the value to my variable otherwise it'll trow an error. My code is listed below but i keep getting the error "Conversion from type 'DBNull' to type 'Integer' is not valid." i've also tried If getoptionpicked.Parameters("@optionpicked").Value = Nothing ThenIf getoptionpicked.Parameters("@optionpicked").Value Is system.dbnull Then below is the rest of the code If getoptionpicked.Parameters("@optionpicked").Value Is Nothing Then Else optionpicked = getoptionpicked.Parameters("@optionpicked").Value If optionpicked = 1 Then option1.Checked = True ElseIf optionpicked = 2 Then option2.Checked = True ElseIf optionpicked = 3 Then option3.Checked = True ElseIf optionpicked = 4 Then option4.Checked = True ElseIf optionpicked = 5 Then option5.Checked = True Else End If End If
Does anyone know a select statement that would return the column namesand keys and indexes of a table?Thanks,TGru*** Sent via Developersdex http://www.developersdex.com ***Don't just participate in USENET...get rewarded for it!
I was comparing the parameters for two stored procs that I made using the SQL Server 2005 express management studio. Both of these sprocs only inserted one field into a single table. These were both of the type varchar.
One of the sprocs had "nocount on" and the other did not. I thought I would see the returns integer parameter in the sproc that did not have "nocount" set to on. I thought this is what returns an integer to validate an insert. Obviously, I am confused about how this works.
Can anyone help me to understand that difference between nocount on and the parameter that returns an integer.
Grrr!I'm trying to run a script:print 'Declaring cursor'declare cInv cursor forward_only static forselectdistinctinv.company,inv.contact,inv.address1,inv.city,inv.state,inv.postalcode,inv.cmcompanyidfromdedupe.dbo.ln_invoice as invleft joindedupe.dbo.customerid as cidondbo.fnCleanString(inv.company) = cid.searchcowhere((inv.customerid is nulland cid.searchco is null)and (inv.date >= '01/01/2003' or (inv.date < '01/01/2003' andinv.outstanding > 0.01))and not inv.company is null)print 'Cursor declared'declare@contact varchar(75),@company varchar(50),@address1 varchar(75),@city varchar(30),@state varchar(20),@zip varchar(10),@cmcompanyid varchar(32),@iCount int,@FetchString varchar(512)open cInvprint 'cursor opened'fetch cInv into@company,@contact,@address1,@city,@state,@zip,@cmc ompanyidprint 'Cursor fetched @@Cursor_rows = ' + cast(@@cursor_rows asvarchar(5))All the prints are there to help me figure out what's going on!When I get to the Print 'Cursor fetched @@cursor_rows....the value is 0 and the script skips down to the close and deallocate.BUT, if I just highlight the Select...When section, I get over 2,000rows. What am I missing?Thanks.
I am developing the database application. This is a live database and is being used by the customer. I am to release a new version and I had to add new columns to fit the requirements DateStarted (DateTime), and TotalHours(Int) into a database table.There are already over a 1000 rows in this table.
When the customer wants to look at a record in this table and insert the value into the text boxes (Front-end), when it gets to the DateStarted or TotalHours it comes up with a error message:"
The value for column 'DateStarted' in table 'IncidentTask' is DBNull."The method for inserting is:
What are the possible solutions to this problem? Would it mean checking for a DBNULL before displaying in the textboxes? Or updating the new column rows with an date:
Code Snippet
UPDATE IncidentTask SET DateStarted = '1/1/2005' WHERE (DateStarted IS NULL)
var query = from cloc in context.t_companylocs where (cloc.ref_company == companyid) && (cloc.street == attributes["Street"]) && (cloc.postalcode == attributes["Postalcode"]) && (cloc.country in countrylist) && (cloc.city in citylist) select cloc; attributes is a Dictionary<string, string> object.countrylist and citylist are List<string> objects.Of course the syntax above doesn't work. It's basically what I'm trying to achieve :-)A quick and dirty solution would be to just drop the two where constraints containing the "where in" statement and handle that part in the following foreach() loop.Can anyone please explain how you would do it properly?regards
I am trying to create a whole number DAX calculated column that is derived from a date column. Basically it gets the date from the source data column and outputs it as an integer in the YYYYMMDD format.So 01/OCT/2015 would become --> 20151001...I've been fidgeting with DAX but my problem is that I keep missing the leading zeroes for months and days. So 01/March/2015 becomes 201531 which is not what I want (I need 20150301 in this case).
Can I put a constraint on an integer column that will only allow a certain range of numbers to be entered, or do I have to put that into the application layer only?
I'd like the range to be 0 to 30 as the only allowable values. The only thing that I could think of was to create another table and populate with 0,1,2...,30 and put a foreign key on the new column that wouldn't allow anything not in that list but I was wondering if there was a better way.
HiI have a query that is performing very strangely.I f I put a top statement in it returns rows,soSelect top 10 * from .......returns 10 rowsbut without it then no data is returnedSelect * from ..........returns 0 rows.
Goodmorning,Could I have a SELECT statement that normally returns two rows,but that instead returns one row appending to the first row the secondone of the result ?For exampleQuery: "SELECT username from tab1 where year in (2001,2002)"Result:1° - "'John'"2° - "'Adam'"Instead I need:Result:"'John','Adam'"?I have Win2000 Pro , SqlServer2000.Thank You--Posted via Mailgate.ORG Server - http://www.Mailgate.ORG
Hi everyone.... I need a column in my table that its DataType should be as integer arrays how can I implemant it in my sqlserver table. Any help appreciated.
i have the following query to sum the total due balance for a customer:
select sum(outstanding)from out where customer = 'myvariable' the problem is when the customer has no outstanding it returns NULL is there a way to return 0 when there are no outstanding?
I have a table of zip codes, some with Canadian zips. I'd like to takea zip code and search for nearby zips. For example:Dim theZip As Integer = textbox1.text....Parameter.Add(@ziplow, SqlDbType.Int, 5).Value = (theZip - 10)....Parameter.Add(@ziphigh, SqlDbType.Int, 5).Value = (theZip + 10)SELECT * from ZIPCODES where Cast(zip_code as Integer) BETWEEN @lowzipAND @highzipProblem is the letters in the Canadian records cannot be cast asintegers for this process. I get this error:Syntax error converting the varchar value '53151 1' to a column of datatype int.Is there a SQL query that can exclude if no cast can be made to anInteger?Thanks!Anton
I need to add a column that has the datatype of integer with a seed and identity increment to a table that already exists and has data in it - and can't all NULLs. I have heard that this not possible if the table already exists.
I have downloaded the demo's of SQL Programmer and a couple of Embarcadero programs to see if that would help, but have had no succes to date.
I have a table that holds a number of offers made to a orginization for placements at a lecture. what im wanting to do is have each of the rows for a orginization repeated so that the names of people attending can be put into the database.
the result im looking to get is something like this where the name of the attendess would be inputed in an application. id | orginization | lecture | nameofattende 1 | orga | lec1 | j. blog 2 | orga | lec1 | s. smith 3 | orga | lec1 | h. samual 4 | orga | lec1 | j. sams 5 | orga | lec1 | b.j. james 6 | orgb | lec1 | m. curry 7 | orgb | lec1 | k. murry 8 | orgb | lec1 | g. hansen
I have DB monitoring jobs which use Sysperfinfo to monitor some of the counters. On One SQL 2K Server since few days the select on sysperfinfo returns 0.
Do you think I need to start any service from the OS side to enable this?
I am using the following conditional select statement but it returns no results.
Declare @DepartmentName as varchar Set @DepartmentName = null Declare @status as bigint Set @status = 4 IF (@DepartmentName = null) BEGIN
SELECT CallNumber AS [Call Number], Problem, Solution, Note FROM AdminView WHERE (Status = @status) ORDER BY CallLoggedDT END ELSE IF (@DepartmentName <> null) Begin
SELECT CallNumber AS [Call Number], Problem, Solution, Note FROM dbo.AdminView WHERE (Status = @status) AND (DepartmentName = @DepartmentName) ORDER BY CallLoggedDT end
when i run the 2nd half by itself it tells me to declare @status but not @departmentname. whats going on???
I have two columns, one column has a document ID and a given document can have many pages. The second column has the pages. Now I want to find out when the page number is broken. For example, if doc ID 1 has 3 rows and each of the three has 1,2,3 and then the fourth row has document 1 but the value jumps from 3 to 7 and then goes to 8,9,10 and then jumps again and starts from 17, i want to have the ranges identified.
DocID Page Number 1   1 1 2 1 3 1 7 1 8 1 9 1 10 1 17 1 18 1 19 1   20
The test.sql scripts I write to test CLR stored procedures run successfully, but when I want to display the resulting data in the database with a simple "SELECT * from Employee"
I get the result as: Name Address ---- ------- No rows affected. (1 row(s) returned)
But not the actual row is displayed whereas I would expect to see something like:
Name Address
---- -------
John Doe
No rows affected.
(1 row(s) returned)
I have another database project where doing the same thing displays the row information but there doesn't seem to be a lot different between the two.
How do we convert both of them into a single SQL DateTime field such as "2015-07-16 01:23:45.000" so that it can be used in a join restricting to a date time in a different SQL File that properly has the DateTime in it?
This works well for converting the transDate Part in the select statement:
  dbo.IntegerToDate(at.transDate) as transDate
  * That returns: "2015-07-16 00:00:00.000"
* The resulting data must work directly in a Microsoft SQL Server Management Studio Query using either using the "on" statement or part of the "where" clause. In other words, NOT as a stored procedure!
Also must be able to be used as a date difference calculation when comparing the 2 files Within say + or - 5 seconds.
Why don't i ever get return value of 1 when the following binary column (profSignature) is null? RETURN SELECT ISNULL(profSignature, profSignature) FROM mpProfiles WHERE ApplicantID = CAST(@CID AS INT) AND ProfileID = CAST(@PID AS INT)
Can anyone provide me with some SQL that will identify rows from a table where a varchar column named "Notes" contain Carriage Returns?
I know that with report writer SQR I can translate CR's to white space but I do not know of any Sybase function that will allow me to do the same, any ideas on this well would be appreciated.
Hi folks,I have an issue with a column I created in my query called Instance.SELECT Object_Id, Event_type, Audience, Subject, Provider, Academic_Year, Start_date, End_date, CONVERT(varchar, Academic_Year) + ' (' + CONVERT(varchar, Start_date, 103) + ') : ' + Event_type AS InstanceFROM EventsORDER BY Event_type Above is my query. The problem is because the start date column can be null, it also returns the Instance column as null for that row.I thought it would have just missed out the date and display the rest, but it doesn't.Is there any way I could get the Instance column to display a value, when the start date is null?ThanksEdit: Managed to sort it using ISNULL()
