Frustration With UniqueIdentifiers (GUIDs)
Feb 26, 2004
We're trying to set a new standard at my office, of using GUIDs as database ID fields - all new tables in all databases will have a GUID as the ID field, using the UniqueIdentifier data type.
The problem that we are running into, is that different applications interpret the UniqueIdentifier data type differently - ADO 2.x interprets it with the opening and closing { } braces. ADO.NET does not include the { and } in the GUID structure, SQL Server Query Analyzer does not include the { } braces, and SQL Server Enterprise Manage does include the { }
so we end up with results like this:
ADO 2.x: {012345678-abcd-ef01-2345-6789abcd}
ADO.NET: 012345678-abcd-ef01-2345-6789abcd
Query Analyzer: 012345678-abcd-ef01-2345-6789abcd
Enterprise Manager: {012345678-abcd-ef01-2345-6789abcd}
The problem with this is in two parts:
1) VB6 does not have a GUID structure or data type, so we are treating GUIDs as strings... but VB6 doesn't recognize "{012345678-abcd-ef01-2345-6789abcd}" and "012345678-abcd-ef01-2345-6789abcd" as the same string
2) when sending a URL link through an email, the { } braces break the link - in all email applications that we have tested. This include Groupwise 6, Groupwise 6.5, IPSwitch Web IMail, Outlook 2000, and Outlook Express (IE 6).
We're becoming very frustrated with the problems at hand, and need to know how others have worked around these problems. Please respond with any kind of advice or any real life situations where you have encountered this and found a solution, etc.
Thanks.
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Jul 1, 2003
I need gurus input on the pros and cons of Seeded(int) Identity colums vs. UniqueIdentifier(GUIDs) columns for my db design.
As I understand it, merging the data of 2 independent db's both using IDENTITY columns would be very hairy because of the possibility of overlap. GUIDs are much more likely to be unique across different servers.
What I'd like to hear from others are the other pros and cons of the situation. I of course understand the performance hit suffered at the hands of the GUID.
Thanks for your help!
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Nov 30, 2007
My first time using the Membership API for .net 2.0 and Sql Server.The userId column is given a unique identifier instead of an autonumber. Like 011fb845-1269-49ca-b5b0-c01efdab0cff So say I want to see how many goals they have logged. I could do a Select * From pgGoals where UserId = "011fb845-1269-49ca-b5b0-c01efdab0cff" ? Should I keep propagating this unique id? for example the goal table has 3 columns, UserId, GoalName, GoalCatIdWhen I set a new goal for that user I populate the UserId column in the database table with the value 011fb845-1269-49ca-b5b0-c01efdab0cff ?? Will this be hard on the database as opposed to an integer id of say 23 ?
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Mar 25, 2008
Hi
I have some report parameters defined whereof two are uniqueidentifiers:
ElementName = 'ALL'
TemplateScorecardID = '85DC707D-3C00-46CB-A7FE-3CF6E7EE71CC'
CompanyScorecardID = 'D65BA811-5EAD-4A29-9C9A-D4F9A1B4F54D'
Period = 1
Now, I have a dataset which is calling a stored procedure that accepts two uniqueidentifiers:
===================================================================
Set fmtonly Off
EXEC procTemplateScorecardMeasureElementOutput
@ElementName,
CONVERT(uniqueidentifier,@TemplateScorecardID),
CONVERT(uniqueidentifier,@CompanyScorecardID),
@Period
===================================================================
When I try to run the report I receive the following error message:
An error occurred during local report processing
An error has occurred during report processing
Query execution failed for data set 'my dataset'
Incorrect syntax near the keyword 'CONVERT',
===================================================================
The question: How can I use report parameters to hold a default uniqueidentifier and then use that in the dataset query?
I have tried using it without the convert function but then the following error is raised.
An error occurred during local report processing
An error has occurred during report processing
Query execution failed for data set 'my dataset'
Error converting data type nvarchar to uniqueidentifier.
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Mar 14, 2004
I am executing an update query in access as follows....
UPDATE (tPriceSmart INNER JOIN tPriceRaw ON tPriceSmart.IdProd = tPriceRaw.IdProd) INNER JOIN tCusMas ON (tPriceRaw.IdPriceSchd = tCusMas.CM_OVRIDE) AND (tPriceSmart.IdCust = tCusMas.CM_CUSTNO) SET tPriceSmart.AmtOverRide = IIf([DtePrice1]<=CDate(Date()),[AmtPrice1],IIf([DtePrice2]<=CDate(Date()),[AmtPrice2],0))
WHERE (((tPriceRaw.IdPriceType)=8));
Here's my stab at converting this to a stored proc.
UPDATE (tPriceSmart INNER JOIN tPriceRaw ON tPriceSmart.IdProd = tPriceRaw.IdProd) INNER JOIN tCusMas ON (tPriceRaw.IdPriceSchd = tCusMas.CM_OVRIDE) AND (tPriceSmart.IdCust = tCusMas.CM_CUSTNO)
SET tPriceSmart.AmtOverRide =
SELECT
CASE
WHEN DtePrice1 <= GetDate() THEN AmtPrice1
ELSE (CASE WHEN (CASE DtePrice2 WHEN '00/00/0000' THEN '1/1/1900' END) <=GetDate() THEN AmtPrice2 ELSE 0 END)
END
WHERE tPriceRaw.IdPriceType=8
I kknow the Join Statement works becasue it does work in the context of a select. I also know the case logic is working becasue I am using it in an Insert query elsewhere.
Can't quite pull it together though. I am getting an error at Line #1 "(". I gave it a good try though before I resorted to throwing it into the forum. I am sure it is a stupid syntax error. Any help would be appreciated.
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Jan 5, 2007
Hi,
Two problems / questions I could do with some help on please......
1). How do you clear a spreadsheet before loading it ? I am sending a spreadsheet by Email on a regual basis. Each time I run my SSIS package the data is appended to that of the previous run. I need just the contents of this data load to populate the spreadsheet each time. I have tried various methods / techniques for achieveing this so I just need to know the accepted method. Sorry if this is very basic ( as it should be ?!) but I seem to be missing the point somewhere.
2). I have tried to resolve issue 1 above by having an empty 'template' spreadsheet and copying that one over the top of the previously populated one. I get an error saying that the source spreadsheet ..'is in use by another processes.' Amusingly, as a test, I can delete it but I cannot copy it !
Are there any decent workthroughs on working with destination excel speadhseets ? Im struggling.
Thanks,
Jon
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Apr 17, 2006
I have tried many things and even the worst case thing which I was trying to avoid i.e. uninstalled MSDE SP3 and Analysis Services and service packs but the problem is still not solved...
Whenever I open a DTS in design view and double click on the link (the line connecting the two) between the source and destination servers the PC goes to sleep and comes back after a long time and then the same problem occurs when I press on the transformation tab...
I know this may sound weird but that really is the case :o
Any clues anyone .... please
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Apr 17, 2006
I have tried many things and even the worst case thing which I was trying to avoid i.e. uninstalled MSDE SP3 and Analysis Services and service packs but the problem is still not solved...
Whenever I open a DTS in design view and double click on the link (the line connecting the two) between the source and destination servers the PC goes to sleep and comes back after a long time and then the same problem occurs when I press on the transformation tab...
I know this may sound weird but that really is the case :eek:
Please help :o
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May 27, 2008
Hi, I am a new learner and user to SQL Sever 2005 and am having some major frustration trying to write a simple query.
I have two tables, 1) Ticket_Purchase, 2) Flight.
The Ticket_Purchase table has these columns: Ticket_Purchase_Number(PK), Flight_Number(FK), Date_Purchase_Made, Ticket_Price, Class_of_Ticket, Passenger_ID
The Flight table has these columns: Flight_Number(PK), Flight_Date, Flight_Departure_Time, Flight_Arrival_Time, Flight_Origin, Flight_Destination
I am trying to create a query that will tell me: On which flight were the most first class tickets sold?
There are only two types of classes; 'E' for economy and 'F' for First Class.
So far I am able to get a list of all the First class flights for each flight and can visually see which flight has the most first class tickets by counting them manually on the report generated, but I am totally confused on how to simply pull the single flight with the most First class tickets sold. I wonder if this requires something more like a join or a nested sub query?
The SQL I wrote for the above is:
Select Class_of_Ticket, Flight_Number
From Ticket_Purchase
Where Class_of_Ticket = ('F')
Order By Flight_Number;
And it produces:
Class_of_Ticket Flight_Number
--------------- -------------
F 1
F 1
F 1
F 2
F 2
F 3
F 3
F 3
F 3
F 4
F 4
F 4
F 4
F 4
F 4
F 4
F 4
F 4
F 4
F 4
F 4
F 4
F 4
F 5
F 5
F 6
F 6
F 6
F 7
F 7
F 8
F 8
F 8
F 9
F 9
F 9
F 9
F 9
(38 row(s) affected)
Rather I would like it to produce:
First_Class_Seats Purchased Flight_Number
--------------------------- ------------
14 4
I hope I didn't make this to confusing to understand as I am still learning the syntax and 'lingo' of how to communicate this stuff verbally.
Thank you for any help you could offer. It would be much appreciated.
Edit: the query report I pasted from SQL should have the flight number directly under the column header. For some reason the space between Class and Flight_number is being eliminated in the post.
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Jun 20, 2007
Hello! I have an SSIS package that basically collects Excel files from an FTP server, deposits them to a file share on a SQL server and then processes each Excel file into a SQL 2005 database using the ForEach enumerator.
The package runs flawlessly when executed directly on the SQL server. The problem starts when I set this package to run via the SQL Agent. I have looked through these forums and other places and have done what this article suggested http://support.microsoft.com/kb/918760; changing my package protection to
"Dont Save Sensitive" and setup the package to store its configuration in a SQL table. Despite all this I still continue to get this error when the package is run via the Agent:
SSIS Error Code DTS_E_CANNOTACQUIRECONNECTIONFROMCONNECTIONMANAGER. The AcquireConnection method call to the connection manager "ExcelSourceFile" failed with error code 0xC0202009. There may be error messages posted before this with more information on why the AcquireConnection method call failed.
The Excel files are not password protected, no funky settings, nothing complicated, its just a plain Excel file with a few rows of data on one worksheet. The package transfers the files from the FTP server to the share on the SQL server with no problem, I can see that the files exist on the share, so it isnt a case of the Excel connection manager not finding any files to process.
The Agent account is running under administrator privileges and has full access to the share, so it shouldnt be a permissions issue either.
I have no idea what else to check, any ideas?
Thanks!
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May 9, 2006
Hi,
I would like to know different possible ways in appending extra values like new uniqueidentifiers, sequence numbers, random number. Can you please tell what type of data flow components helps us ?
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Oct 31, 2007
Hello,I am creating a new database and I was advised to use Sequential Guids.I was reading some information and, as far as I understood, I can use NEWSEQUENTIALID. This can be used when I have a uniqueidentifier column as the key of a clustered index to avoid fragmentation during insert. Ok, so I use NEWSEQUENTIALID instead of NEWID.But I will use LINQ most of the time instead of Stored Procedures.So can I specify in my tables scripts to use Sequential Guids when, for example, a record is created? And am I right when using Sequential Guids?Here is a part of my code:-- Blogs ...
create table dbo.Blogs
(
BlogID uniqueidentifier not null
constraint PK_Blog primary key clustered,
Title nvarchar(400) null,
Description nvarchar(2000) null,
CreatedDate datetime null
)
-- Posts ...
create table dbo.Posts
(
PostID uniqueidentifier not null
constraint PK_Post primary key clustered,
BlogID uniqueidentifier not null,
AuthorID uniqueidentifier not null,
Title nchar(1000) null,
Body nvarchar(max) null,
UpdatedDate datetime not null,
IsPublished bit not null,
constraint FK_Posts_Blogs
foreign key(BlogID)
references dbo.Blogs(BlogID)
on delete cascade,
constraint FK_Posts_Users
foreign key(AuthorID)
references dbo.Users(UserID)
on delete cascade Thanks,Miguel
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Sep 21, 2005
I'm really sorry if this is too OT but it is related to replication...
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Mar 13, 2007
I have one report (R1) which includes a list of ports ("=Fields!Port_Name.Value")
Another report (R2) supplies details for individual reports and has a parameter named PortDWIDPortName which gets port names from the same dimension as those in R1. So in the field properties of the Port field in R1, I selected Navigation > Jump To Report and entered PortDWIDPortName = Fields!Port_Name.Value (also tried changing .Value to .Key or .UniqueName) but although it jumps to report R2 it does not enter a value for the parameter (ie leaves it blank or displays <Select Value> depending on whether multivalue or not).
Does anyone know the right syntax to pass the parameter ? If not, does anyone know to view what Jump To Parameter is returning so I can figure how to doctor it!
Thanks
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Feb 28, 2006
Hello,
I've been thinking about using GUIDs as primary keys within my application. One problem I have with this approach is that GUIDs generated with NEWID() are not sequential, and this can have a huge impact on insertion performance due to fragmented indexes. It would seem that NEWSEQUENTIALID() solves this issue, however it doesn't seem very practical to use this on SQL Server Mobile. With SQL Server, you can specify an OUTPUT clause for an INSERT statement, and using this, determine what the last inserted GUID was. There doesn't seem to be such an option in SQL Server Mobile, so how can I get the last generated GUID so that I can attach children records to my parent record? It's been suggested that you could use the MAX() function to get the latest GUID, but there is a problem with this approach - NEWSEQUENTIALID() guarantees that the GUIDs generated will be sequential for the machine generating them, but makes no guarantees about how this will fit in with GUIDs generated by other machines. It is entirely possible that GUIDs generated by a different machine will be larger than the latest one generated on the current machine, so using MAX() to determine the latest value doesn't seem like a valid option to me.
Does anybody have any ideas on tackling this problem? Any thoughts on the suitability of using GUIDs as the primary key for SQL Server Mobile devices in general?
Thanks,
Adrien.
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Jan 18, 2006
Am I looking at a potential bug here or do I not understand the feature properly? I have an ExecuteSQL task that inserts into a table for logging and includes the System::PackageID as one of the values. It's stored in my table as a uniqueidentifier. When I set the output variable in Parameter Mappings tab of the Execute SQL task to VarChar, all works great. WHen I set it to GUID as the data type in that tab, it outputs a different GUID than the actual System::PackageID variable.
-- Brian
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Jan 30, 2008
Are Guids good or bad? I've spoken to people who hate them in databases, but the db's I'm using right now all use them, so there must be *some* people out there who like them. I'm interested to know what other people think.
thanks!
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Apr 27, 2005
Rather than the real code, here's a sample we came up with.
Here's the C# Code:
public class sptest : System.Web.UI.Page
{
protected System.Web.UI.WebControls.Label Label1;
private DataSet dtsData;
private void Page_Load(object sender, System.EventArgs e)
{
// Put user code to initialize the page here
string strSP = "sp_testOutput";
SqlParameter[] Params = new SqlParameter[2];
Params[0] = new SqlParameter("@Input", "Pudding");
Params[1] = new SqlParameter("@Error_Text", "");
Params[1].Direction = ParameterDirection.Output;
try
{
this.dtsData = SqlHelper.ExecuteDataset(ConfigurationSettings.AppSettings["SIM_DSN"], CommandType.StoredProcedure, strSP, Params);
Label1.Text = Params[0].Value.ToString() + "--Returned Val is" + Params[1].Value.ToString();
}
//catch (System.Data.SqlClient.SqlException ex)
catch (Exception ex)
{
Label1.Text = ex.ToString();
}
}
Here is the stored procedure:
CREATE PROCEDURE [user1122500].[sp_testOutput](@Input nvarchar(76),@Error_Text nvarchar(10) OUTPUT)AS
SET @Error_Text = 'Test'GO
When I run this, it prints up the input variable, but not the output variable.
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Dec 14, 2006
Hi fellows ,
there is a senerio where i want to update GUIDS in columns "pubid" and "artid" generate in sysmergepubliction and sysmergeAricles respectivly in sqlserver 2005 ?
2nd is there any easy way to generate scripts of triggers of all replicated tables in subscriber at one .
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Dec 11, 2007
hello,
I have several tables that have guids as their primary keys and the tables are related as follows:
Table1 - primary key = ServiceNo (Guid), Filter Key = CampaignNo
Table2 - primary key = CostBasisNo (Guid), Foreign Key = ServiceNo (from Table1)
Table3 - primary key = UserId, Foreign Key = ServiceNo (from table1)
Table4 - primary key = SourceServiceNo (Foreign Key from Table1), MemberServiceNo(Foreign Key from Table1)
what I need to do is copy all records from Table1 where CampaignNo = @CampaignNo and insert them into table1, this I can do easily but I will generate a new ServiceNo for each one and associated a new CampaigNo which is fine.
The problem comes in that I need to also copy the contents of Table2 = Table3 for all ServiceNos that have been copied from Table1 but insert the new Guid that will have been created when copying the rows in Table1
This is further compounded when I need to do the same to Table4 but this time I need to insert the newid's for SourceServiceNo and the related MemberServiceNo which all would have changed.
I haven't the first clue where to start with this task, do I need to use temporary tables, cursors? any help gratefully received, even if it's a pointer to the most efficient approach.
regards
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Dec 1, 2005
I've been playing around with the new data controls (DetailsView,FormView) and have been having problems when attempting to update a record that has a uniqueidentifier as its primary key.I get the error message:
Object must implement IConvertible. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.InvalidCastException: Object must implement IConvertible.I gather this is because there is a bug that has propagated from the beta version.One suggested work around is from http://64.233.183.104/search?q=cache:GDjA62POtgcJ:scottonwriting.net/sowBlog/archive/11162005.aspx+Implicit+conversion+from+data+type+sql_variant+to+uniqueidentifier+is+not+allowed.+Use+the+CONVERT+function+to+run+this+query.&hl=en
The crux of the problem, it appears, is that the <asp:Parameter> value for the uniqueidentifier field is, by default, set to Type=�Object�. To fix this, simply remove the Type property altogether. That is, change the SqlDataSource parameter setting from something like:
<asp:SqlDataSource ...> <InsertParameters> <asp:Parameter Name=�UserId� Type=�Object� /> ... </InsertParameters></asp:SqlDataSource>
to:
<asp:SqlDataSource ...> <InsertParameters> <asp:Parameter Name=�UserId� /> ... </InsertParameters></asp:SqlDataSource>
This change worked for me; once the Type was removed the exception ceased and the updates/inserts worked as expected.Unfortunately this only partially worked for me as while it is fine for deletes it won't work for updates.If anyone can help shed any light on this I would greatly appreciate it.CheersMark
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May 7, 2008
In my site, when a user registers, I need to create rows in additional tables besides aspnet_Users. So, I need to be able to pass the generated userId guid to subsequent SqlCommands. I'm having a terrible time with this. What's the correct way to set up a SqlParameter so that it will accept a guid? I keep getting this error: "Conversion failed when converting from a character string to uniqueidentifier."
I've tried creating the parameter both with and without a SqlDbType.
cmd.Parameters.AddWithValue(paramName, guid);
and
SqlParameter p = new SqlParameter(paramName);p.SqlDbType = SqlDbType.Guid;cmd.Parameters.Add(p);
and I get the same error either way.
Driving me nuts! Any help appreciated.
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