Why Use CLR Procedures For Simple Queries?
Dec 24, 2005
Allow me to preface this by saying I'm really excited about writing stored procedures, etc. in C#!! Now...on to my question. When an application needs a simple result set (i.e., SELECT....), why use C# to write this? In the samples I've seen, the developer ends up writing the select statement anyway in the CLR hosted stored procedure. What would be the benefit? You end up writing more code just to write the same query. Now, executing complex logic is another story. I see HUGE benefits to hosting classes on the data server. Anyway, what is Microsoft's answer to this question? Is it recommended that one still write simple statements in T-SQL and leave the complex stuff to CLR code? Thanks in advance for your advice!
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Sep 18, 2006
Hi, please excuse me if this seems like a daft or badly formed question.
A colleage mentioned that when constructing the where clause in a query that it was important what order the criteria were entered. They weren't sure themsleves but the idea was that starting from the bottom of the query you should add the criteria that will have the effect of reducing the data the most and then work 'up' the query back to the from clause.
As a dodgy example, if you have a staff table and you want to run a specific query on all staff over 75 that are male, then:
where gender = "male"
and age >- 75
The reasoning being that the age criteria would reduce the size of the data being worked on more than the gender criteria.
It's been a while since I've had to look at intermediate tables etc but i'm pretty sure this suggestion will not make any difference to the performance of a query.
Thanks,
Matt
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Jan 25, 2008
how can I fill a data set with a multi parameter filter:
I want to create in my form few textboxes and create a query that filters the dataset to show only the specific data.
but the problem is if the user doesn't supply any words in some textbox the dataset is not filled.
it would be a good solution for me if I can either:
for example let's say my query is SELECT * FROM table WHERE column = @parameter,
i want to write before the query something like "if @parameter="" then replace the query syntax near WHERE with * so it looks SELECT * FROM table WHERE column = *.
or:
if there is some character or character series that sql reconizes in a parameter as an asterisk.
thank you for your time!
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May 5, 2007
Hi everybody!
I have made a simple application with VB6 and SQL 2005 Express.
And after testing it in a network simulated with Virtual-Machine Workstation, the "real world" application was first getting slower and slower, and finally giving timeout errors.
It is even difficult to connect. The application times out always at 30 secs although the ado connection timeout was established longer (45)
I have checked on the machine where the server is installed, just in case the slow down was due to network problems, but it fail locally too.
Any help is wellcome
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Sep 19, 2007
Hi,
I have a quick question about pushing things onto the database to do. It is supposed to be more efficient, and it is more secure. The downside as far as I can tell is that one can end up with incredibly expensive and complex database deployment using costly servers and software.
Is there an approach that minimizes database query time by moving much of the processing to the (less efficient) web server calling the database, and then only using simply queries. One would then process the data in code, stripping it down to exactly what is needed, rather than doing complex things on the db itself.
An example of this might be that you want to parse a field on a particular char. and return only the first part of the string, up until this char occurs. This can be done on the db server, but...
I understand that one might return extra information, but it seems there is a large potential payoff in less complexity and expense.
Anyway, if you know of such an approach and the name of it, I would appreciate hearing it,
Thanks
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Jun 12, 2006
Hello, I'm trying to create a Stored Procedure who receives the table name as a parameter, then uses a cursor to obtain every column name and then builds a string like SELECT col1, col2, ... from TABLE
In fact that would be the same as SELECT * FROM table; but I can't do this, because I'll be using this stored procedure to loop through many tables that has different quantity of columns with a DTS, and if a specify the *, then the DTS wouldn't let me do the select with tables with different quantity of fields.
Could you help me please, because my code isn't working:
CREATE PROCEDURE dbo.stp_Test
(
@tablename AS VARCHAR(50)
)
AS
DECLARE @columnname varchar(50)
DECLARE @strsql Nvarchar(500)
DECLARE @query varchar(4000)
SET NOCOUNT ON
DECLARE c1 CURSOR FOR
SELECT column_name FROM information_schema.columns
WHERE table_name = @tablename
OPEN c1
FETCH NEXT FROM c1 INTO @columnname
WHILE @@fetch_status = 0
BEGIN
IF (@strsql is null)
BEGIN
SET @strsql=@columnname
END
ELSE
BEGIN
SET @strsql = @strsql + ',' + @columnname
END
FETCH NEXT FROM c1 INTO @columnname
END
CLOSE c1
DEALLOCATE c1
SELECT @query = 'SELECT ' + @strsql + ' FROM ' + @tablename
EXEC @query
SET NOCOUNT OFF
GO
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Nov 23, 2007
Hello all,
I'm looking for a best practice.
Let's say you have a report that contains out of 3 queries.
How are you going to create the report and why?
1. Just use "select * from table where p1= value" in your report
2. Save the query in your db as a view and use the view in your report
3. Create a procedure that contains all 3 queries. And use the procedure with some parameters in your report?
Kr
Karel.
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Dec 17, 2007
Hi,
We have our DWH built in SQL Server 2005. We are doing reporting against the DWH and most of query logic is complex. For this purpose we have proposed to write SPs to encapsulate the logic and which in turn can be called from the Report Data Tab. But our IT Architect suggest us to have inline queries instead of SPs as that will reduce the overhead of going to the DBAs everytime the logic changes. As I am new to DWH+Reporting, I was really pondering over which way to go. Can anyone suggest a way out on this.
Thanks,
S Suresh
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Jun 8, 2006
I have been trying to export an sql2000 database to sql2005 with no luck. I continuosly get the error
Msg 0, Level 11, State 0, Line 0
A severe error occurred on the current command. The results, if any, should be discarded.
I have looked upon all support material and have installed the latest sql2005 service pack, but this has not fixed the problem. a simple query as:
select * from [transaction] ta,transactionentry tr
where tr.transactionnumber=ta.transactionnumber and
glacctid=6 and ta.[time]> '3/01/2006'
would produce this fatal error.
the current version I am using is:
Microsoft SQL Server 2005 - 9.00.1399.06 (Intel X86) Oct 14 2005 00:33:37 Copyright (c) 1988-2005 Microsoft Corporation Standard Edition on Windows NT 5.2 (Build 3790: Service Pack 1)
This problem is happening on some of the most important tables in the database.
the error log contains the following:
2006-06-06 11:43:32.59 spid54 ***Stack Dump being sent to C:Program FilesMicrosoft SQL ServerMSSQL.1MSSQLLOGSQLDump0001.txt
2006-06-06 11:43:32.59 spid54 SqlDumpExceptionHandler: Process 54 generated fatal exception c0000005 EXCEPTION_ACCESS_VIOLATION. SQL Server is terminating this process.
2006-06-06 11:43:32.59 spid54 * *******************************************************************************
2006-06-06 11:43:32.59 spid54 *
2006-06-06 11:43:32.59 spid54 * BEGIN STACK DUMP:
2006-06-06 11:43:32.59 spid54 * 06/06/06 11:43:32 spid 54
2006-06-06 11:43:32.59 spid54 *
2006-06-06 11:43:32.59 spid54 *
2006-06-06 11:43:32.59 spid54 * Exception Address = 0136B4F0 Module(sqlservr+0036B4F0)
2006-06-06 11:43:32.59 spid54 * Exception Code = c0000005 EXCEPTION_ACCESS_VIOLATION
2006-06-06 11:43:32.59 spid54 * Access Violation occurred writing address FFFFFFFC
2006-06-06 11:43:32.59 spid54 * Input Buffer 260 bytes -
2006-06-06 11:43:32.59 spid54 * select * from [transaction] tr,transactionentry te where tr.
2006-06-06 11:43:32.59 spid54 * transactionnumber = te.transactionnumber and glacctid = 6
2006-06-06 11:43:32.59 spid54 *
2006-06-06 11:43:32.59 spid54 *
2006-06-06 11:43:32.59 spid54 * MODULE BASE END SIZE
2006-06-06 11:43:32.59 spid54 * sqlservr 01000000 02BA7FFF 01ba8000
2006-06-06 11:43:32.59 spid54 * ntdll 7C800000 7C8BFFFF 000c0000
2006-06-06 11:43:32.59 spid54 * kernel32 77E40000 77F41FFF 00102000
2006-06-06 11:43:32.59 spid54 * MSVCR80 78130000 781CAFFF 0009b000
2006-06-06 11:43:32.59 spid54 * msvcrt 77BA0000 77BF9FFF 0005a000
I have followed instructions on some support issues posted but none have helped. If anyone has any solution to this problem PLEASE HELP!!!!.
Thanks.
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Dec 20, 1999
Help!
I have converted my Access Jet database to a SQL Server database. In Access, I had many functions that I created to use in my queries. SQL Server does not allow for functions to be created. So, I had to create procedures in SQL Server to perform what my functions did.
I am trying to use the procedures I created on calculated fields within my SQL statement in my view. It returns an error stating that the procedure is not recognized.
How can I create functions to be used in my query?
Thanks.
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Mar 15, 2007
I know its a weird request, but we have created an application with sql server but our client wants a version which can be put onto disk.
We decided to create the stored procedures into queries, would this be the best idea and if so does anyone know if there is a freeware software that can do this or will I have to painstakingly re-create the queries?
Any advice would be greatly appreciated.
Many thanks
Smilla
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Jul 23, 2005
Hi,I'm adapting access queries to sql server and I have difficulties withthe following pattern :query1 : SELECT * FROM Query2 WHERE A=@param1query 2: SELECT * FROM Table2 WHERE B=@param2The queries are nested, and they both use parameters.In MS Acccess the management of nested queries with parameters is soeasy (implicit declaration of parameters, transmission of parametersfrom main query to nested query)that I don't know what the syntax should be for stored procedures.The corresponding stored procedure would be something likeCREATE TABLE #TempTable (...table definition...)INSERT INTO #TempTable ExecProc spQuery2 @Param2SELECT * FROM #TempTable WHERE A=@Param1And spQuery2 would be : SELECT * FROM Table2 WHERE B=@ParamI was wondering if this syntax would work and if I can skip theexplicit declaration of #TempTable definition.Thanks for your suggestions.
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Mar 12, 2008
Im reviewing my stored procedures for a new application and got to thinking about protecting against sql injection. I think im pretty safe since im using stored procedures and none of them use any 'exec' commands within them, but im not sure.
I was reading this article, and again all the examples that list a stored procedure, have an 'exec' command somewhere that is the culprit. So, in my case lets say I was doing something like this:
Im generally using regularexpression validation controls on the client side of the application and limiting the max length of the input there as well.
Am I safe, or do I need further input checking within the procedure ?
Code Snippet
CREATE PROCEDURE [dbo].[get_Uploads]
@app varchar(50)
--Init variables
SET @error_number = 0
BEGIN TRY
SELECT [Logid],[Filename],[Label],[UploadDate],[App]
FROM UploadLog au
WHERE [App]=@app
END TRY
BEGIN CATCH
SET @error_number = -2
END CATCH
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Jan 11, 2008
I'm using sql 2005. I tried using Profiler with a filter on TempDB but it doesn't seem to record the activity.
Thanks.
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Mar 7, 2007
Hello everyone,
I don't know what category would be appropriate for this question but security seems to be close enough.
I have this case scenario: I am running an automated application that extracts data from a web site and stores the data into a table on SQL server 2005. This information is not confidential in the extreme of social insurance #'s, bank account #s, but should not be seen by a typical employee (it has no use for them). After the data has been stored, it retrieves the data from the same table, processes it, and updates the same table. This application runs every hour infinitely.
Should all the insert, update, and select queries be stored under a stored procedure? I am not concern with performance. My concern would fall under design and security.
Is it worth to hide the details of inserting/updating/selecting behind a stored procedure? Or should I just allow the program to send select/update/insert SQL queries?
No employee (other then the developer and the DB admin) or customer ever access this table (They do not have permission from SQL). The username and passwords were created with security in mind.
Any thoughts or ideas?
Thanks for your time, Adrian
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Feb 9, 2007
Hi,
My scenario:
I have a master securities table which has 7 fields. As a part of the daily process I am uploading flat files into database tables. The flat files contains the master(static) security data as well as the analytics(transaction) data. I need to
1) separate the master (static) data from the flat files,
2) check whether that data is present in the master table, if not then insert that data into the master table
3) If data present then move that existing record to an history table and then update the main master table.
All the 7 fields need to be checked to uniquely identify a single record in the master table.
How can this be done? Whether we can us a combination of data flow items or write a sql procedure to do all this.
Thanks in advance for your help.
Regards,
$wapnil
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May 26, 2005
SQL Server 2000, ASP.Net 1.1
I've been writing this stuff for a while, and can't seem to come to the
conclusion of how I should be retrieving data and assigning this data
to variables.
Since i'm using SQL Server, I'm convinced that I should be using the
datareaders GetSqlDouble (or whatever) function, but this would mean i
need my local variables to be one of the SQL types. The problem
with that is, that there will have to be lots of conversions done by me
to be able to use a SQL type in my application.
For instance, I have a class where i'm retrieving dates. In order
to retrieve them correctly (Null values included), I need to retrieve
them with GetSqlDateTime(), then when it comes time to display the date
in a table, i must first check for nulls, then convert to a
string. This seems to be very cumbersome. Would I be better
off just using GetDateTime(), and the .ToString method, and ignoring
Sql Types all together?
so, basically, how are you guys using your sql server data? with
the supplied sql types, and doing all of the post-processing work
manually? I feel like i'm having trouble conveying my
issue...hopefully someone knows what i mean....i'd just like some
direction to save trouble in the long run, since i feel like there's
got to be a better way...
Confused!
Thanks,
JJ
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May 26, 2004
Hey,
I have MS SQL database.
I have procedure:
code:--------------------------------------------------------------------------------
CREATE PROCEDURE dbo.Reg_DropTable
@ModuleId varchar(10)
AS
declare @TableName varchar, @kiek numeric
set @TableName = 'reg_'+@ModuleId
begin
DROP TABLE @TableName <- HERE I GOT ERROR
end
GO
--------------------------------------------------------------------------------
I got error when using variable with tables names.
How to do this?
Ps. Number is send to this function and it must drop table with name Reg_[That number]
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Jul 23, 2005
I'm trying to write a procedure that having created a new database,will then create within that new database all the tables andprocedures that go with it.In doing this I'm hitting the problem that you can't issue a USEcommand within a procedure.So my question is either- how do I get around this?- if I can't, how can I create procedures etc in a *different*(i.e. the newly created) databaseor- is there a better way to do all this (*)I have SQL files that do this currently, but I need to edit in thename of the database each time before execution, so I thought aprocedure would be better. Also I'd like eventually to expose someof this functionality via a web interface.Although I'm a newbie, I feel I'm diving in the deep end. Any goodpointers to all the issues involved in this aspect of databasemanagement would be appreciated.(*) One thought that occurs to me is to have a "template" database,and to then somehow copy all procedures, tables, view etc from that.--HTML-to-text and markup removal with Detaggerhttp://www.jafsoft.com/detagger/
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Nov 6, 2007
Using SQL 2005, SP2. All of a sudden, whenever I create any stored procedures in the master database, they get created as system stored procedures. Doesn't matter what I name them, and what they do.
For example, even this simple little guy:
CREATE PROCEDURE BOB
AS
PRINT 'BOB'
GO
Gets created as a system stored procedure.
Any ideas what would cause that and/or how to fix it?
Thanks,
Jason
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Feb 21, 2007
I am receiving funny results from a query. To simplify, I have 2 tables (todayyesterday). Each tbl has the same 8 columns. My query joins the two tables then looks where either of two columns has changed. What is happening is that when checking one of the columns it seems as though sql is flipping the column, causing it to be returned in error.
result set
colA colB colC colD colE colF colG colG (from yesterday)
1 1 a b c d e m
1 1 a b c d m e
So what's happening is that the record above is actually the same record and should not be returned. There is a daily pmt column that changes but I am not using that in the query. Aside from that the two records are identicle.
Any help is appreciated.
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Aug 19, 2006
Hi,
I have the following situation (with a site that already works and i cannot modify the database architecture and following CrossRef tables -- you will see what i mean by CrossRef tables below)
I have:
Master table Hotel
table AddressCrossRef (with: RefID = Hotel.ID, RefType = 'Hotel', AddrID)
joins
table Address (key = AddrID)
table MediaCrossRef (with RefID = Hotel.ID, RefType= 'Hotel', MediaID)
joins
table Media (with MediaID,mediaType = 'thumbnail')
foreach hotel, there definitely is a crossRef entry in AddressCrossRef and Address tables respectively (since every hotel has an address)
however not all hotels have thumbnail image
hence i have hotel inner join AddressXReff inner join Address ..... however i must have
left outer join mediaXref left outer join media
the problem is that if there is no entry in Media or mediaXref, I don't get any results
i tried to get over it by using
where (media.mediaTyple like 'thumbnail' or media.mediaType is null)
but then i started getting multiple results for each hotel because media's of type movie or full_image or etc... all got returned
any clue?
thanks
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Jul 20, 2005
HelloWhen I use a PreparedStatement (in jdbc) with the following query:SELECT store_groups_idFROM store_groupsWHERE store_groups_id IS NOT NULLAND type = ?ORDER BY group_nameIt takes a significantly longer time to run (the time it takes forexecuteQuery() to return ) than if I useSELECT store_groups_idFROM store_groupsWHERE store_groups_id IS NOT NULLAND type = 'M'ORDER BY group_nameAfter tracing the problem down, it appears that this is not preciselya java issue, but rather has to do with the underlying cost of runningparameterized queries.When I open up MS Enterprise Manager and type the same query in - italso takes far longer for the parameterized query to run when I usethe version of the query with bind (?) parameters.This only happens when the table in question is large - I am seeingthis behaviour for a table with > 1,000,000 records. It doesn't makesense to me why a parameterized query would run SLOWER than acompletely ad-hoc query when it is supposed to be more efficient.Furthermore, if one were to say that the reason for this behaviour isthat the query is first getting compliled and then the parameters aregetting sent over - thus resulting in a longer percieved executiontime - I would respond that if this were the case then A) it shouldn'tbe any different if it were run against a large or small table B) thisperformance hit should only be experienced the first time that thequery is run C) the performance hit should only be 2x the time for thenon-parameterized query takes to run - the difference in response timeis more like 4-10 times the time it takes for the non parameterizedversion to run!!!Is this a sql-server specific problem or something that would pertainto other databases as well? I there something about the coorect use ofbind parameters that I overall don't understand?If I can provide some hints in Java then this would be great..otherwise, do I need to turn/off certain settings on the databaseitself?If nothing else works, I will have to either find or write a wrapperaround the Statement object that acts like a prepared statement but inreality sends regular Statement objects to the JDBC driver. I wouldthen put some inteligence in the database layer for deciding whetherto use this special -hack- object or a regular prepared statementdepending on the expected overhead. (Obviously this logic would onlybe written in once place.. etc.. IoC.. ) HOWEVER, I would desperatelywant to avoid doing this.Please help :)
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Jul 23, 2005
I want to know the differences between SQL Server 2000 storedprocedures and oracle stored procedures? Do they have differentsyntax? The concept should be the same that the stored proceduresexecute in the database server with better performance?Please advise good references for Oracle stored procedures also.thanks!!
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Sep 30, 2006
Hi,
This Might be a really simple thing, however we have just installed SQL server 2005 on a new server, and are having difficulties with the set up of the Store Procedures. Every time we try to modify an existing stored procedure it attempts to save it as an SQL file, unlike in 2000 where it saved it as part of the database itself.
Thank you in advance for any help on this matter
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Aug 9, 2006
Hi,
I am using visual web developer2005 express edition and finding hard time to get my query run in this i am making my own login page as i have few more things to ask to user before they get logged in so i am not using the login control.
i want to write my own query without help of sqlDataSource control from start something like
sqldatasource con=new sqldatasource;
con.connection String=""
then what all things will come........ ???
and please give me some poitners to some articles which help one to do the requested.
Regards,
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Dec 7, 2007
I have an update query which either inserts a row or increases quantity, depending if row exists or not. It works, better than my explanation probably.After that query could be a good time to count total of all calculated sub sums.Something like this. previous queryEND goSELECT SUM(SubTotal)FROM dbo.t_Shoppings I have tried this on the tool which has a long name, but I think my way didn't work. (Microsoft sql server management studio express)Is this possible or do I have make and call another stored procedure.I can send my sp if someone wants.
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Dec 18, 2007
how can i execute for example
2 queries together, in a single stored procedure Select top 20 * from Product where Active=1select Count( *) from product if i execute such one how can i get the 2 results in vb/c# ?
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Jun 18, 2004
hi which is bettere to use a quesry from the code or to use a Stored Procedure and call the SP from the code
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Oct 21, 2004
Hi All,
Not sure if I've got the correct place for this question. But, I'm trying to create and sql query to list the lates 10 items in a database. So far I haven't had any luck finding this.
All I have is a normal query (below). Can anyone help me please?
SELECT * FROM pages WHERE show = 'yes' ORDER BY id Desc;
Regards,
Rich
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Jan 23, 2006
Hi,I have 5 tables in sql database, naming Book, Category, Subject, UserDownload, User.In Book table, BookID, BookTitle, CategoryIDIn Category table, CategoryID, CategoryNameIn Subject table, SubjectID, SubjectName, CategoryIDIn UserDownload table, UserID, BookIDIn User table, UserID, UserNameI used Book to store information of books. Those books has many categories. In those categories, there is also some subjects.When user downloads book, I update UserDownload table.The result I want to get is, Top Ten Download Subject. How can I get? Please help me.
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Jul 16, 2002
Could anyone help me?I need all the commands like select,from etc.Basically I need to learn writing queries etc.Please
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