SQL Server 2014 :: User Defined Function - Using Table Name As Variable
Aug 9, 2014
I'm trying to create a simple function that will do a count on a table. I want to pass the table name in form of a parameter to the variable and this function will return the count as an int. See my function below...
CREATE FUNCTION count_rows (@tablename varchar(100)
RETURNS int AS
BEGIN
DECLARE @emp_count AS int
declare @declaration varchar(100)
[Code] ....
The errors I am getting are as follows:
Msg 102, Level 15, State 1, Procedure count_rows, Line 3
Incorrect syntax near 'RETURNS'.
Msg 102, Level 15, State 1, Procedure count_rows, Line 10
Incorrect syntax near '@declaration'.
Msg 178, Level 15, State 1, Procedure count_rows, Line 14
A RETURN statement with a return value cannot be used in this context.
Does anyone know where to find or how to write a quick user defined fucntionthat will return a table object when passed the string name of the tableobject. The reason why I want dynamicallly set the table name in a storedprocudue WITHOUT using concatination and exec a SQL String.HenceIf @small_int_parameter_previous = 1 then@vchar_tablename = "sales_previous"else@vchar_tablename = "sales"Endselect * from udf_TableLookup(@vchar_tablename )So if I pass 1, that means I want all records from "sales_previous"otherwise give me all records from "sales" (Sales_Previous would last yearssales data for example).udf_TableLookup would I guess lookup in sysobjects for the table name andreturn the table object? I don't know how to do this.I want to do this to avoid having 2 stored procedures..one for current andone for previous year.Please respond to group so others may benfiit from you knowledge.ThanksErik
We have created several Table Valued User Defined Functions in a Production SQL Server 2005 DB that are returning large (tens of thousands of) rows obtained through a web service. Our code is based on the MSDN article Extending SQL Server Reporting Services with SQL CLR Table-Valued Functions .
What we have found in our implementations of variations of this code on three seperate servers is that as the rowset grows, the length of time required to return the rows grows exponentially. With 10 columns, we have maxed out at approximately 2 500 rows. Once our rowset hit that size, no rows were being returned and the queries were timing out.
Here is a chart comparing the time elapsed to the rows returned at that time for a sample trial i ran:
It took 570 seconds (just over 9 1/2 minutes to return 2566 rows).
The minute breakdown during my trial is as follows: 1 = 655 (+ 655) 2 = 1081 (+ 426) 3 = 1325 (+244) 4 = 1610 (+285) 5 = 1822 (+212) 6 = 1988 (+166) 7 = 2160 (+172) 8 = 2308 (+148) 9 = 2451 (+143)
As you can tell, except for a few discrepancies to the resulting row count at minutes 4 and 7 (I will attribute these to timing as the results grid in SQL Management Studio was being updated once every 5 seconds or so), as time went on, fewer and fewer rows were being returned in a given time period. This was a "successful" run as the entire rowset was returned but on more than several occasions, we have reached the limit and have had 0 new rows per minute towards the end of execution.
Allow me to explain the code in further detail:
[SqlFunction(FillRowMethodName = "FillListItem")] public static IEnumerable DiscoverListItems(...) {
ArrayList listItems = new ArrayList();
SPToSQLService service = new SPToSQLService();
[...]
DataSet itemQueryResult = service.DoItemQuery(...); // This is a synchronous call returning a DataSet from the Web Service
//Load the DS to the ArrayList
return listItems; }
public static void FillListItem(object obj, out string col1, out string col2, out string col3, ...) {
As you will notice, the web service is called, and the DataSet is loaded to an ArrayList object (containing ArrayList objects), before the main ArrayList is returned by the UDF method. There are 237 rows returned within 10 seconds, which leads me to believe that all of this has occured within 10 seconds. The method GetListItems has executed completely and the ArrayList is now being iterated through by the code calling the FillListItem method. I believe that this code is causing the result set to be returned at a decreasing rate. I know that the GetListItems code is only being executed once and that the WebService is only being called once.
Now alot of my larger queries ( > 20 000 rows) have timed out because of this behaviour, and my workaround was to customize my web service to page the data in reasonable chunks and call my UDF's in a loop using T-SQL. This means calling the Web Service up to 50 times per query in order to return the result set.
Surely someone else who has used Table Valued UDFs has come accross this problem. I would appreciate some feedback from someone in the know, as to whether I'm doing something wrong in my code, or how to optimize an SQL Server properly to allow for better performance with CLR functions.
Dear all I wants to run sql server user defined function when linked two server.
I have linked two sql server.There is one function called getenc().This function created on first server.What i want.I wants to run this user defined function on the second sql server. can any one help me?
This is my problem: I do not know how to get the servername from a C# user defined function . Is this possible?
I am writing a User Defined Function (UDF). Inside of this user defined function I need the name of the databaseserver that it is running on. Does anyone have an idea how I might do this? Is there an enviromental variable that I could access within the C# code I use to write the UDF?
I could always use a parameter to pass in the name of the server, but I would like to have as few parameters as possible.
I have a function that accespts a string and a delimeter returns the results in a temp table. I am using the funtion for one of the columns in my view that needs be to split and display the column into different columns. The view takes for ever to run and finally it doesn't split and doesn't display in the column.
Function: ----------------------------------- ALTER FUNCTION [dbo].[func_Split] ( @DelimitedString varchar(8000),
[Code].....
Not sure what I am missing in the above view why it doesn't split the string.
EXEC master.dbo.xp_msver ProductVersion can be used to return the server version in a resultset. I need this to do some conditional coding between varchar and varchar(max) in a UDF, so size of the text I return must be different between the SQL2000 and SQL2005.
I cant call an xp_ that returns a resultset within a UDF can I, so how can I get the SQL version?
I have a User Defined Function in my SQL Server 2000 database which takes a string and adds an integer quantity to it. The function basically takes the string (string because of first character and spaces) and adds an integer to it creating a new number (starting number and ending number concept).If I pass in a string that has a letter for the first character, it works fine. However, if the first character is an integer it trims out all 0s and whitespace and ruins the necessary formatting. Note, the formatting is always the same - x xxx xxxx xx. Any help or ideas would be appreciated.Example:D 499 8900 01 plus a Quantity of 10 returns D 499 89000 11 which is perfect.However,0 076 0000 03 plus a Quantity of 1 returns 764 764 (it should be 0 076 0000 04)------------------------------------CREATE FUNCTION [dbo].[NEW_End_NR2]( @OldStr as char(20), @Quantity int )RETURNS @NewNR_Tbl TABLE (New_EndNr char(20) primary key)AS BEGIN DECLARE @NewStr char(20) DECLARE @addNr integerBEGIN Set @addNr = @Quantity set @NewStr = (select REPLACE(@OldStr,left(@OldStr, 1),'')) set @NewStr = (select REPLACE(@NewStr,' ', '')) + @addNr set @NewStr = (SELECT left(@OldStr, 1) + SPACE(1) + left(@NewStr,3) + SPACE(1) + left(REPLACE(@NewStr, left(@NewStr,3), ''), 4) + SPACE(1) + left(REPLACE(@NewStr, left(@NewStr,7), ''), 3)) BEGIN INSERT INTO @NewNR_Tbl (New_EndNr) VALUES(@NewStr) END END RETURNEND
I have this function in access I need to be able to use in ms sql. Having problems trying to get it to work. The function gets rid of the leading zeros if the field being past dosn't have any non number characters.For example:TrimZero("000000001023") > "1023"TrimZero("E1025") > "E1025"TrimZero("000000021021") > "21021"TrimZero("R5545") > "R5545"Here is the function that works in access:Public Function TrimZero(strField As Variant) As String Dim strReturn As String If IsNull(strField) = True Then strReturn = "" Else strReturn = strField Do While Left(strReturn, 1) = "0" strReturn = Mid(strReturn, 2) Loop End If TrimZero = strReturnEnd Function
---------------------------------------------------------------------- I executed it in my SQL Server Management Studio Express and I got: Commands completed successfully. I do not know where the result is and how to get the result viewed. Please help and advise.
Is there a way that I can create a user defined variable in my database? I have a fairly large chunk of xml that I would like to store in the database that can be updated by clients ( in rare cases ). I could use other mechinisms to allow access to it, but all other application related information is stored nicely in this one place, I hate to vary for this single piece.
I have a UDF that takes my input and returns the next valid business day date. My valid date excludes weekends and holidays. It works perfect except for one issue. It doesn't check to see if today's date is a holiday. I pass a query to sql server like so " select dbo.getstartdate('01/ 10/2007',2)" It then moves ahead two business days and returns that date. Here is the current code. Hopefully someone can tell me how to do the holiday check on the current date. I really don't want to rewrite the whole script . Code--------------------------------------------------------- SET QUOTED_IDENTIFIER OFF GOSET ANSI_NULLS OFF GO --DROP FUNCTION GetStartDate --declare function receiving two parameters ---the date we start counting and the number of business days CREATE FUNCTION GetStartDate (@startdate datetime, @days int) RETURNS datetimeASBEGIN --declare a counter to keep track of how many days are passingdeclare @counter int /*Check your business rules. If 4 business days means you count starting tomorrow, set counter to 0. If you start counting today, set counter to 1*/set @counter = 1 --declare a variable to hold the ending datedeclare @enddate datetime --set the end date to the start date. we'll be -- incrementing it for each passing business dayset @enddate = @startdate /*Start your loop.While your counter (which was set to 1), is less than or equal to the number of business days increment your end date*/WHILE @counter <= @days BEGIN --for each day, we'll add one to the end dateset @enddate = DATEADD(dd, 1, @enddate) --If the day is between 2 and 6 (meaning it's a week --day and the day is not in the holiday table, we'll --increment the counter IF (DATEPART(dw, @enddate) between 2 and 6) AND (@enddate not in ( select HolidayDate from tFederalHoliday where [HolidayYear] = datepart(yyyy,@enddate) ) ) BEGIN set @counter = @counter + 1 END --end the while loopEND --return the end dateRETURN @enddate --end the functionEND GOSET QUOTED_IDENTIFIER OFF GOSET ANSI_NULLS ON GO ---------------------------------------------------------------------------------------------
Hi everyone, I am tring to pass acomma delimited string to a function and this function is parsing the string so that I can see individual values so for example I am passing 1,2,3,4,5 as a parameter to my function and I am parsing this string so that I can write something like this Select * from tableA where userID in(1,2,3,4) It is working fine. Only problem is if the user passes word 'all' instead of 1,2,3,4 then I have to doSelect * from tableA My function looks like this. How can I modify this function if I pass 'all' as a paramater. Any help will be appreciated.CREATE FUNCTION [dbo].[ParseText2File] (@p_text varchar(4000), @p_Delimeter char(1)) RETURNS @results TABLE (id varchar(100)) AS BEGIN declare @i1 varchar(200) declare @i2 varchar(200) declare @tempResults Table (id varchar(100)) while len(@p_text) > 0 and charindex (@p_Delimeter, @p_text) <> 0 begin select @i1 = left(@p_text, charindex(@p_Delimeter, @p_text) - 1) insert @tempResults select @i1 select @p_text = right(@p_text, len(@p_text) - charindex(@p_Delimeter,@p_text)) end insert @tempResults select @p_text insert @results select * from @tempResults return END Thanks
I am a new user for SQL server. Coming from an oracle background, I find it very difficult to live without user defined functions. At the moment, I urgently need to have a function returning an custom-made ID string, so that it can be used in one of my stored procedures. I have heard the rumours that SQL server 7 does NOT support user defined functions, (which SQL 6.5 does). I would be really grateful if anyone can clarify this for me, and if possible, suggest a get-around approach.
I am trying to compare the data from one table (shipments) with the data from a view. The point of the function is to match the correct territory with the account depending on the data. Basically, I this deals with accounts that are transfering from one territory to another. The transfers take effect on the first day of the month, retroactive, therefore we need to allocate the sales data to the correct territory in the shipments table. Here is my function. Can someone tell me how I can get this to work and insert a territory ID for the account that has transfered into the shipments table?
CREATE FUNCTION fnShipments () RETURNS @Shipments TABLE (AccountID CHAR(10), DateInvoice DateTime, DollarShipments Money, TerritoryID CHAR(10)) AS BEGIN INSERT @Shipments (AccountID, DateInvoice, DollarShipments, TerritoryID) SELECT Shipments.AccountID, Shipments.DateInvoice, DollarShipments, ISNULL((SELECT TerritoryID FROM vwAccountTransfers
WHERE Shipments.AccountID = vwAccountTransfers.AccountID
AND vwAccountTransfers.EffectiveMonth =
(SELECT MIN(EffectiveMonth) FROM vwAccountTransfers
WHERE Shipments.AccountID = vwAccountTransfers.AccountID AND DatePart(m,Shipments.DateInvoice) < vwAccountTransfers.EffectiveMonth)), (SELECT TerritoryID FROM vwAccountTransfers WHERE Shipments.AccountID = vwAccountTransfers.AccountID AND vwAccountTransfers.EffectiveMonth Is Null ) ) AS Territory FROM Shipments
ORDER BY Shipments.AccountID, Shipments.DateInvoice; RETURN END
User: Will be sending me a datetime e.g '9 Nov 2004 15:00:00' I want the UDF to do the following for me Return in hours the difference between what the user has send and now (lets say now = '10 Nov 2004 11:00:00') So the UDF will return to me 20. But I dont want 20, I want the UDF to avoid any all hours which are not work related (any time after 16h00 until 8h00 in the morning), so I want this UDF to return 4. That means from '9 Nov 2004 15:00:00' I have calculated 1hr until 16h00 and 3hrs from 8 until 11h00 on '10 Nov 2004 11:00:00'
AGAIN IT MUST NOT CALCULATE WEEKENDS. Lets say '12 Nov 2004 15:00:00' was Friday and now = '15 Nov 2004 11:00:00', I must still get 4 as a return from UDF
I would also like now to be my getdate(), but it seems like you can't use it in UDF
Hi, Iam working on one user defined function which will take week & year as argument and returns sunday date of that particular week in that year. for example if i give (15,2007) as argument it shud give 2007-04-08 as result. Plz anybody help this on this issue.
I am accustomed to doing most of my function work in Access, but the boss would really like it if I could shedule some cubes to do the stuff that takes forever when you run it live.
To that end, I have an Access function that I call to get a field value for a query. I would like to be able to create an User Defined Function on the SQL server and call that function as a field value in a view. I have searched the forums and have not really found anything that wants to make sense to me as to how to do this.
The access function is as follows:
Public Function BuyerDeltas(IFSDate As Date, PODate As Date) As Long
If IFSDate < (Date + 14) Then BuyerDeltas = IFSDate - 3 - PODate ElseIf IFSDate < (Date + 29) Then BuyerDeltas = IFSDate - 7 - PODate ElseIf IFSDate > (Date + 28) Then BuyerDeltas = IFSDate - 10 - PODate Else MsgBox "This should not be possible!", vbOKOnly, "Fix It!!!!!!!" End If
End Function
The view that this is called from contains the IFSDate and PODate fields and I am able to call the function from the access query, but this is completely different than what I have seen in the help files on SQL.
I would love to be able to keep plugging away at doing this myself, but the boss also is pushing me to get it done and he doesn't want me taking forever to do it.
hai, the problem is - I have created a userdefined function using SQL 2000 create function getfulldate (@date varchar(10))returns datetimeasbegindeclare @getfulldate datetime set @getfulldate = dateadd (mi,55,@date) return @getfulldateend and normally we call this in the SQL statements as select *, dbo.getfulldate('2006-05-03') from emp This works fine and what I need was, I need to invoke the user-defined function like select *, getfulldate('2006-05-03') from emp that is, without using "dbo". If I call in that manner, it gives error as - 'getfulldate' is not a recognized function name. So, here what is the purpose of dbo and can I call in my desired manner as mentioned above. anyone guide me, thanks!
Hi,How to exec a SQL user defined function in query analyzer when it accepts parameters.. I know for a stored procedure we can write EXEC nameofstored procedure abc (@abc is the parameter passed).. But How to run a SQL function ?Thanks
I have a sproc that passes an ID to a user defined function. I just realized that the udf can only return scalar type value. I need it to return a varchar(10). How can i do this with similiar functionality. Any ideas?
I have a requirement where i need to get the current time/date within a Function. As getDate function is a non deterministic function it can not be used with in a function. Your guidence in this regard is greately appreciated.
It is possible to use getdate() in userdefined function. If so, how to do the same ?
The following code throws error :
create function function1 return varchar DECLARE @currYYMM VARCHAR(20) SET @currYYMM = convert(char(4),getdate(),12) // Here it says the error 'getdate' can't be used inside functions ............... .....................
Hi, While i execute the followgin code. it gives error. Please resolve it as while calling the function i want to use getdate() or any other dynamic variable or any select such as
select title from SalesByStore( select admission_Dte from addmission )
It gives error.
-------------------------------------------------------------------------- use pubs go
createFUNCTION SalesByStore (@storeid datetime) RETURNS TABLE AS RETURN (SELECT top 5 title, qty FROM sales s, titles t
Hi, I posted a question sometime back about any one has written a function which converts a given date to a a new timezone.
As it turns out I have actually written the function and it is functionally sound.
the issue I am not facing is the performace.
The Algorithm is pretty simple. step 1 I have create a table called TZ1 which has the TImezoneCODE (PST,EST..), daylightsavingsstart (DATETIME on which the daylight savings start), daylightsavingsend ( end of DLS) and offset (EG -8 for PST, -5 for EST etc)
step 2 I check the timezone and pick out corresponding start and enddate for daylight savings.
Step 3 Depending on where the date lies I create a new date by adding offset to the original datetime (+1) for the new date and then return this new datetime.
As simple as this looks the response time is 16 times than that of a select statement without the function.
Do you see something that I can tune to get a better response time.
CREATE FUNCTION TC3 -- drop function tc3 (@dt datetime, @Src varchar(10), @Dest varchar(10)) Returns datetime begin declare @v_src varchar(10) Declare @v_dest varchar(10) declare @V_dt datetime declare @v_newdt datetime declare @v_year int declare @v_offset float declare @v_sd datetime declare @v_ed datetime
-- select * into TZ1 from TZ1 -- create table #tz1 (fn int)
select @v_year = datepart (year, @dt)
if (@v_year between 2000 and 2004) begin -- ------------------- -- PST BEgin -- ------------------- if (@dest = 'PST') begin -- select * from TZ1 select @V_year = datepart (year, @dt)
select @v_offset = offset, @v_sd = daylightsavingsstart, @v_ed = daylightsavingsend from TZ1 where @V_YEAR = YEAR and timezonecode = @dest -- AND @DT between daylightsavingsstart and daylightsavingsend
if (@dt between @v_sd and @v_ed ) begin -- ( select @v_newdt = dateadd (hh, -9, @dt) ) select @v_newdt = dateadd (hh, CAST( @v_offset as int)-1 , @dt) end else begin -- ( select @v_newdt = dateadd (hh, -8, @dt) ) select @v_newdt = dateadd (hh, @v_offset, @dt) end -- if dt between daylight savings
return @v_newdt end -- @dest=pst end -- ------------------- -- PST END -- ------------------- -- ------------------- -- EST BEGIN -- -------------------
ELSE
if (@dest = 'EST') begin
select @V_year = datepart (year, @dt)
select @v_offset = offset, @v_sd = daylightsavingsstart, @v_ed = daylightsavingsend from TZ1 where @V_YEAR = YEAR and timezonecode = @dest
if (@dt between @v_sd and @v_ed ) begin -- ( select @v_newdt = dateadd (hh, -9, @dt) ) select @v_newdt = dateadd (hh, CAST( @v_offset as int)-1 , @dt) end else begin -- ( select @v_newdt = dateadd (hh, -8, @dt) ) select @v_newdt = dateadd (hh, @v_offset, @dt) end -- if dt between daylight savings
return @v_newdt
end -- @dest=Est end
-- ------------------- -- EST END -- -------------------
-- ------------------- -- HST BEgin -- select * from timezones -- ------------------- else if (@dest = 'HST') begin
select @V_year = datepart (year, @dt)
select @v_offset = offset, @v_sd = daylightsavingsstart, @v_ed = daylightsavingsend from TZ1 where @V_YEAR = YEAR and timezonecode = @dest
if (@dt between @v_sd and @v_ed ) begin -- ( select @v_newdt = dateadd (hh, -9, @dt) ) select @v_newdt = dateadd (hh, CAST( @v_offset as int) , @dt) end else begin -- ( select @v_newdt = dateadd (hh, -8, @dt) ) select @v_newdt = dateadd (hh, @v_offset, @dt) end -- if dt between daylight savings
return @v_newdt
end -- @dest=Ast end
-- ------------------- -- HST END -- -------------------
-- ------------------- -- MST BEgin -- select * from timezones -- ------------------- else if (@dest = 'MST') begin
select @V_year = datepart (year, @dt)
select @v_offset = offset, @v_sd = daylightsavingsstart, @v_ed = daylightsavingsend from TZ1 where @V_YEAR = YEAR and timezonecode = @dest
if (@dt between @v_sd and @v_ed ) begin -- ( select @v_newdt = dateadd (hh, -9, @dt) ) select @v_newdt = dateadd (hh, CAST( @v_offset as int)-1 , @dt) end else begin -- ( select @v_newdt = dateadd (hh, -8, @dt) ) select @v_newdt = dateadd (hh, @v_offset, @dt) end -- if dt between daylight savings
return @v_newdt
end -- @dest=Mst end
-- ------------------- -- MST END -- -------------------
