Loving GUID's
Apr 29, 2008
I'm reluctant to admit I'm in love with uniqueidentifiers AKA guid's.
However, this love comes with a cost because of the size and thus SQL Cache and thus IO reads (and fragmented index pages and so on)
My love has to do with generic programming and keeping multiple database updateable (adding core functionality with the flexibility to let users add and change data in tables that have core data in it as well). Also merging databases is easy or relate different entities by storing a metadata link table.
So, what I'm trying to do is making the disadvantages as small as possible.
So I'm using NEWSEQUENTIAL Id's and retrieve new made records with OUTPUT as TABLE.
So I changed the default CLUSTERED INDEX as NON-CLUSTERED.
I'm not fond on usings numerics for some primary keys and uniqueidentifiers for others.
What else can I do to keep using GUID's as primary keys with as less disadvantages as possible?
Henri
~~~~
There's no place like 127.0.0.1
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Mar 4, 2008
How do I update the OrderGUID column in Table B with Values from OrderGUID column in Table A. I have already populated the OrderGUID column in Table A using NEWSEQUENTIALID(). Now I need to populate the OrderGUID column in Table B with Matching GUID values from the OrderGUID Column in Table A.
Does any one have a script to accomplish this task. thanks
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Feb 1, 2001
we are currently using id's as primary key and replication is not part of our project.
will this be a problem if we decide to do replication? will microsoft generate an identifier then.
what is the advantages of using GUID now or doing it latter?
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May 26, 2006
Hello,
I'm working on a smart client app that has an offline sql express store and needs to work with several types of central databases (support for multiple products - ms sql, DB2 etc)
While trying to put together some offline functionality that needs the user to create records on the offline sql express data store, we've run into the need of being able to uniquely identify records so replicating the data in the offline store back into the primary database should not be a problem.
The data created offline spans many tables and involves several tables with relation ships - FK etc...Clearly not a simple case of store and forward.
We dont want to get into the mess of performing key replacement during a synch job with the server. Thats way too much trouble.
GUID seems like a good choice, but as always we have several stake holders having different opinions. And with databases other than MS SQL we will have to store them as strings.
To cut to the chase - can we not hash a GUID to get an integer while retaining atleast the same likelyhood of producing unique ids ? [no drop]
Thanks,
Aviansh
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Apr 13, 2007
I am using a SqlDatasource and need to set a SelectParamter to the ProviderUserKey (The GUID of the user when Profiles are enabled)
Can anyone tell me whether it is possible and How?
I am currently using the session state to store it in and then using the session=... to get the value into the parameter.
Is there a direct way of passing this value into a SelectParameter when using a SqlDataSource?
Thanks in advance.
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Sep 25, 2007
Hi Everyone,
I'm trying to create a SQL Delete statement using a string builder and the WHERE clause uses a Guid. Here is the code:stb.Append("DELETE FROM UserRights WHERE UserIDPtr = ");
stb.Append(TargetUserID);The resulting string is: "DELETE FROM UserRights WHERE UserIDPtr = e01549fb-edf5-4668-de8b-b13dd5661a6e"
When I try to do an ExecuteNonQuery() using the string as the CommandText, I get an error.
Invalid column name 'e01549fb',Invalid column name 'edf5',Invalid column name 'de8b',Invalid column name 'b13dd5661a6e'
It is also strange that '4668' did not show up as an invalid column name, but I don't think that is relavent to this issue.
Can someone show me (or point me to an article) about using Guid's in a text string as a SQL command? Thanks in advance!
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May 5, 2008
My database is using the membership store for all the user information. I added a tabel "Skills" with 3 fields "SkillID (GUID)" "SeekerID (GUID, This is the UserId)" and "SkillName ( Varchar(MAX))"
on the page i have a ListView setup to display the SkillName fields based on the SeekerID.
The original code was Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
' Get a reference to the currently logged on user Dim CurrentUser As MembershipUser = Membership.GetUser
' Determine the currently logged on user's UserId value
Dim SeekerID As Guid = CType(CurrentUser.ProviderUserKey, Object)
End Subthat kept returning string to GUID conversion errors, so i had to change Dim SeekerID As Guid = CType(CurrentUser.ProviderUserKey, Object) to Dim SeekerID As Object = CType(CurrentUser.ProviderUserKey.ToString(), Object) that appears to be working now. On the same page however, I want to insert records into the table, I tried 2 options both of which have a different problem.
Option 1: Use a textbox (ID = NewSkill) and a button with the following code on it:
Protected Sub SetNewSkill_Click(ByVal sender As Object, ByVal e As System.EventArgs) Dim CurrentUser As MembershipUser = Membership.GetUser
Dim SeekerGUID As Object = CType(CurrentUser.ProviderUserKey, Object)
Dim NewSkill As TextBox = CType(FindControl("NewSkill"), TextBox) Dim connectionString As String = ConfigurationManager.ConnectionStrings("QJSdatabase").ConnectionString()
Dim insertSql As String = "INSERT INTO Skills(SeekerID, SkillName)VALUES(@SeekerGUID, @NewSkill)" Using myConnection As New SqlConnection(connectionString)
myConnection.Open() Dim myCommand As New SqlCommand(insertSql, myConnection)
myCommand.Parameters.AddWithValue("@SeekerGUID", SeekerGUID) myCommand.Parameters.AddWithValue("@NewSkill", NewSkill.Text.Trim())
myCommand.ExecuteNonQuery()
myConnection.Close()
End Using
End Sub
Problem: myCommand.Parameters.AddWithValue("@NewSkill", NewSkill.Text.Trim()) gets outlined and returns the error: Object reference not set to an instance of an object
Option 2: Use a DetailsView linked to a SQLDataSource on the page
<asp:DetailsView ID="DetailsView1" runat="server" Height="50px" Width="210px"
AutoGenerateRows="False" DataSourceID="SqlDataSource2" DefaultMode="Insert"> <Fields>
<asp:BoundField DataField="SkillName" HeaderText="Add Skill:" SortExpression="SkillName" />
<asp:CommandField ShowInsertButton="True" />
<asp:TemplateField InsertVisible="False">
<EditItemTemplate>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label1" runat="server"></asp:Label>
</ItemTemplate>
</asp:TemplateField>
</Fields>
</asp:DetailsView>
<asp:SqlDataSource ID="SqlDataSource2" runat="server" ConnectionString="<%$ ConnectionStrings:database %>"
DeleteCommand="DELETE FROM [Skills] WHERE [SkillID] = @SkillID" InsertCommand="INSERT INTO [Skills] ([SeekerID], [SkillName]) VALUES (@SeekerGUID, @SkillName)"
SelectCommand="SELECT SkillName FROM [Skills]"
UpdateCommand="UPDATE [Skills] SET [SkillName] = @SkillName WHERE [SkillID] = @SkillID">
<DeleteParameters>
<asp:Parameter Name="SkillID" Type="Object" />
</DeleteParameters>
<InsertParameters>
<asp:Parameter Name="SeekerGUID" Type="Object" />
<asp:Parameter Name="SkillName" Type="String" />
</InsertParameters>
<UpdateParameters>
<asp:Parameter Name="SkillName" Type="String" />
<asp:Parameter Name="SkillID" Type="Object" />
</UpdateParameters>
</asp:SqlDataSource>
http://junk.icore-studios.com/junk/Codeissues/postresumeerror.html
The @SeekerGUID is being generated by the same pageload code as the first chunk i gave (I have 2 variables SeekerID is the GUID converted to string to work with the ListView filter and SeekerGUID is the GUID)
Ultimatly getting either option to work would be fine. Though I think the second would be preferable because I think it'd be easier to replicate later on.
Thanks in advance for your time and any help
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Apr 17, 2004
Hi,
I am having a hard time updating a database row using a UNIQUEIDENTIFIER. I retrieve the row into a datagrid and then use the GUID as a parameter to a stored procedure, but it doesn't update. If I run the query in SQL Analyser ... it works. Any ideas ? Here's my stored proc ... I tried passing a varchar and doing the conversion in the SP ... no go !! I am using MApplicationBlockD.
CREATE PROCEDURE spScanUpdate
@id varchar (100),
@name varchar (75)
AS
DECLARE @GUID_ID as uniqueidentifier
SELECT@GUID_ID = CAST ( @id as uniqueidentifier )
UPDATE tScan
SET name = @name
WHEREid = @GUID_ID
GO
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Apr 17, 2006
I use MS SQL Server 2005...Is there a structural advantage/disadvantage with using GUID as oposed to an integer?(also I use the sqltableprofileprovider and it doesnt seem to work with uniqueidentifiers)
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Sep 26, 2007
does SQL Server have the equivalent of the Identity or Scope_Identity functions that can be used to return the last GUID PK?
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Apr 11, 2008
I have a database with tables with GUID's als primary keys.
Because of the uniqueness GUID's are a performance hit on INSERT records.
So I wanted to use NEWSQUENTIALID() to make INSERTS faster.
Does NEWSQUENTIALID() increase performance as well with SELECT statements? Or is the benefit between NEWID() and NEWSQUENTIALID() only when INSERTing records?
Henri
~~~~
There's no place like 127.0.0.1
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Mar 13, 2008
I have a table profiles and a table resumes.
The id's are currently int indentity fields.
I was thinking of using a GUID as ID.
Why would i do this ?
In my webapplication I have i.e. this page
DeleteProfile.aspx?profileId=1
I don't want to give the user the ability to change this to f.e.
DeleteProfile.aspx?profileId=3
A user will almost possibly never guess a certain GUID, right ?
Is this a good idea, or not ?
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Jul 20, 2005
Hi,Is there any replace for "Select @@identity" that could return "justinserted" GUID as a primary key?Has anyone tested what's faster, working with Guid or Autonumber ?
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Jul 20, 2005
Greetings All, I have read many upon many articles here regarding GUIDdata types and uniqueness. There have been many opinions regardingthe effectiveness of GUID's and when they should/should not be used.However, every article strongly implies, if it does not state itoutright, that GUID's are always unique. My question is this, whathappens if you have a database that uses GUID's and the NIC is changedout on the box? From what I understand the MAC address of the NIC isused as part of the algorithm to generate a GUID. If you change outthe NIC after generating 1 billion GUID's do you run the chance ofgenerating a duplicate GUID?I look forward to your insightfulness on this issue.Regards, Louis.
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Feb 26, 2007
Hi, please can someone be so kind and tell me the fastet way to get the GUID of the running SQLExpress instance ?
Sincerely,gonzo883.
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Apr 28, 2008
Exists any easy way to renew component GUID without having to recreate the component?
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Mar 12, 2006
I have been trying to setup the GUID new GUID when I add a row into a Pocket PC WM 5.0 Mobile SQL (*.sdf) utilizing C# through Visual Studio 2005 - targetting Pocket PC Smart Device
Any help would be most welcome...
Thanks
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Sep 17, 2006
I am reading a book and it talks a little bit about using GUIDs as primary keys. I am very confused about this because if this is a generated value per table, how could you use it as a foreign key in another table as it appears to be uniquely generated per table. Here is the code in the book which I don't understand. Can someone explain this in simple terms?
I know the identity column would be a problem if I had a multi-terabyte database with huge tables, so what do I do in this situation?
create table dbo.product(
productid uniqueidentifier not null
rowguidcol default (newid())
primary key nonclustered
etc
thx,
Kat
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Oct 24, 2007
once upon a time someone told me how to do this, but i forget, and it was for classic asp..
so what im trying to do is create a new record (a workstation) and get back the auto generated ID (its not actually a GUID, its an int which is set to the identity) and then once i have that create other records (for external devices, different table) that will have a link to which machine they are attached to (that Id im looking to get returned)
I know this can be done in a two step process, create the record, query it for its id, and then slap that in my next insert statement for the external devices... but... i know there was a way to do it before and i assume there is a way to do it now...
anyone know how?
Thanks
Justin
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Jun 12, 2008
I need to execute stored procedure which is suppose to return GUID to my IF statement and if it is Nothing I execute other Stored procedures else some other procedures. My problem is that even though by looking at the data I know that after the execution of the procedure it should return some guid value it doesn't anybody who had the same issue??? That is the code block where I am trying to return guid from my stored procedure: getGroupID.Parameters("@GroupName").Value = dr.Item("Group ID").ToString() If getGroupID.ExecuteScalar() = Nothing Then 'Find Group by IP address if input Data Table doesn't have group getGroupIDByIP.Parameters("@IP").Value = dr.Item("IP").ToString() If getGroupIDByIP.ExecuteScalar() = Nothing Then insertGroup.Parameters("@GroupID").Value = Guid.NewGuid insertGroup.Parameters("@Group").Value = dr.Item("Group ID") insertGroup.Parameters("@ACCID").Value = getAccID.ExecuteScalar() insertGroup.ExecuteNonQuery() command.Parameters("@Group_ID").Value = getGroupID.ExecuteScalar() Else command.Parameters("@Group_ID").Value = getGroupIDByIP.ExecuteScalar() End If Else command.Parameters("@Group_ID").Value = getGroupID.ExecuteScalar() End If Thank you
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May 13, 2004
Dear SQL,
I need to SELECT something from a database that has a UNIQUEIDENTIFIER (GUID) field,
If the number is wrong (has some other than A-Z 0-9) than the ASP page just freaks out and gets "error converting from a character string to uniqueidentifier"
How can I check that the GUID is OK before I SELECT ?
this is the number format:
{7A9B5F81-4936-4A31-B4E2-9168AAB75A0}
I tried to cast this "error" number with no successs:
"WHERE Deceased_ID = cast('"& "---------4936-4A31-B4E2-9168AAB75A0" &"' as uniqueidentifier)"
Thanks in advance, Yovav.
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May 23, 2004
I am having a terrible time doing an insert.... dispite what the error message says, I think it has something to do with trying to insert a GUID (my primary key).... but I am probably wrong :-)
Any ideas
The error message
Server Error in '/LightQuote' Application.
--------------------------------------------------------------------------------
Prepared statement '(@User_ID uniqueidentifier,@User_Type int,@Status int,@UserName ' expects parameter @UserName, which was not supplied.
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.Data.SqlClient.SqlException: Prepared statement '(@User_ID uniqueidentifier,@User_Type int,@Status int,@UserName ' expects parameter @UserName, which was not supplied.
Source Error:
Line 195: dbConnection.Open()
Line 196: Try
Line 197: rowsAffected = dbCommand.ExecuteNonQuery
Line 198: Finally
Line 199: dbConnection.Close()
The Insert Function
Public Function InsertOneUser( _
ByVal user_ID As System.Guid, _
ByVal user_Type As Integer, _
ByVal status As Integer, _
ByVal userName As String, _
ByVal password As String, _
ByVal secret_Question As Integer, _
ByVal secret_Answer As String, _
ByVal company As String, _
ByVal company_Type As Integer, _
ByVal first_Name As String, _
ByVal last_Name As String, _
ByVal address1 As String, _
ByVal address2 As String, _
ByVal city As String, _
ByVal state As String, _
ByVal zip As String, _
ByVal country As String, _
ByVal day_Phone As String, _
ByVal night_Phone As String, _
ByVal fax As String, _
ByVal email As String, _
ByVal web_Site As String) As Integer
Dim myConnection As New Connection
Dim connectionString As String = myConnection.ConnString
Dim dbConnection As System.Data.IDbConnection = New System.Data.SqlClient.SqlConnection(connectionString)
Dim queryString As String = "INSERT INTO [tblUser] ([User_ID], [User_Type], [Status], [UserName], [Password], " & _
"[Secret_Question], [Secret_Answer], [Company], [Company_Type], [First_Name], [L" & _
"ast_Name], [Address1], [Address2], [City], [State], [Zip], [Country], [Day_Phone" & _
"], [Night_Phone], [Fax], [Email], [Web_Site]) VALUES (@User_ID, @User_Type, @Sta" & _
"tus, @UserName, @Password, @Secret_Question, @Secret_Answer, @Company, @Company" & _
"_Type, @First_Name, @Last_Name, @Address1, @Address2, @City, @State, @Zip, @Coun" & _
"try, @Day_Phone, @Night_Phone, @Fax, @Email, @Web_Site)"
Dim dbCommand As System.Data.IDbCommand = New System.Data.SqlClient.SqlCommand
dbCommand.CommandText = queryString
dbCommand.Connection = dbConnection
Dim dbParam_user_ID As System.Data.IDataParameter = New System.Data.SqlClient.SqlParameter
dbParam_user_ID.ParameterName = "@User_ID"
dbParam_user_ID.Value = user_ID
dbParam_user_ID.DbType = System.Data.DbType.Guid
dbCommand.Parameters.Add(dbParam_user_ID)
Dim dbParam_user_Type As System.Data.IDataParameter = New System.Data.SqlClient.SqlParameter
dbParam_user_Type.ParameterName = "@User_Type"
dbParam_user_Type.Value = user_Type
dbParam_user_Type.DbType = System.Data.DbType.Int32
dbCommand.Parameters.Add(dbParam_user_Type)
Dim dbParam_status As System.Data.IDataParameter = New System.Data.SqlClient.SqlParameter
dbParam_status.ParameterName = "@Status"
dbParam_status.Value = status
dbParam_status.DbType = System.Data.DbType.Int32
dbCommand.Parameters.Add(dbParam_status)
Dim dbParam_userName As System.Data.IDataParameter = New System.Data.SqlClient.SqlParameter
dbParam_userName.ParameterName = "@UserName"
dbParam_userName.Value = userName
dbParam_userName.DbType = System.Data.DbType.StringFixedLength
dbCommand.Parameters.Add(dbParam_userName)
Dim dbParam_password As System.Data.IDataParameter = New System.Data.SqlClient.SqlParameter
dbParam_password.ParameterName = "@Password"
dbParam_password.Value = password
dbParam_password.DbType = System.Data.DbType.StringFixedLength
dbCommand.Parameters.Add(dbParam_password)
Dim dbParam_secret_Question As System.Data.IDataParameter = New System.Data.SqlClient.SqlParameter
dbParam_secret_Question.ParameterName = "@Secret_Question"
dbParam_secret_Question.Value = secret_Question
dbParam_secret_Question.DbType = System.Data.DbType.Int32
dbCommand.Parameters.Add(dbParam_secret_Question)
Dim dbParam_secret_Answer As System.Data.IDataParameter = New System.Data.SqlClient.SqlParameter
dbParam_secret_Answer.ParameterName = "@Secret_Answer"
dbParam_secret_Answer.Value = secret_Answer
dbParam_secret_Answer.DbType = System.Data.DbType.StringFixedLength
dbCommand.Parameters.Add(dbParam_secret_Answer)
Dim dbParam_company As System.Data.IDataParameter = New System.Data.SqlClient.SqlParameter
dbParam_company.ParameterName = "@Company"
dbParam_company.Value = company
dbParam_company.DbType = System.Data.DbType.StringFixedLength
dbCommand.Parameters.Add(dbParam_company)
Dim dbParam_company_Type As System.Data.IDataParameter = New System.Data.SqlClient.SqlParameter
dbParam_company_Type.ParameterName = "@Company_Type"
dbParam_company_Type.Value = company_Type
dbParam_company_Type.DbType = System.Data.DbType.Int32
dbCommand.Parameters.Add(dbParam_company_Type)
Dim dbParam_first_Name As System.Data.IDataParameter = New System.Data.SqlClient.SqlParameter
dbParam_first_Name.ParameterName = "@First_Name"
dbParam_first_Name.Value = first_Name
dbParam_first_Name.DbType = System.Data.DbType.StringFixedLength
dbCommand.Parameters.Add(dbParam_first_Name)
Dim dbParam_last_Name As System.Data.IDataParameter = New System.Data.SqlClient.SqlParameter
dbParam_last_Name.ParameterName = "@Last_Name"
dbParam_last_Name.Value = last_Name
dbParam_last_Name.DbType = System.Data.DbType.StringFixedLength
dbCommand.Parameters.Add(dbParam_last_Name)
Dim dbParam_address1 As System.Data.IDataParameter = New System.Data.SqlClient.SqlParameter
dbParam_address1.ParameterName = "@Address1"
dbParam_address1.Value = address1
dbParam_address1.DbType = System.Data.DbType.StringFixedLength
dbCommand.Parameters.Add(dbParam_address1)
Dim dbParam_address2 As System.Data.IDataParameter = New System.Data.SqlClient.SqlParameter
dbParam_address2.ParameterName = "@Address2"
dbParam_address2.Value = address2
dbParam_address2.DbType = System.Data.DbType.StringFixedLength
dbCommand.Parameters.Add(dbParam_address2)
Dim dbParam_city As System.Data.IDataParameter = New System.Data.SqlClient.SqlParameter
dbParam_city.ParameterName = "@City"
dbParam_city.Value = city
dbParam_city.DbType = System.Data.DbType.StringFixedLength
dbCommand.Parameters.Add(dbParam_city)
Dim dbParam_state As System.Data.IDataParameter = New System.Data.SqlClient.SqlParameter
dbParam_state.ParameterName = "@State"
dbParam_state.Value = state
dbParam_state.DbType = System.Data.DbType.StringFixedLength
dbCommand.Parameters.Add(dbParam_state)
Dim dbParam_zip As System.Data.IDataParameter = New System.Data.SqlClient.SqlParameter
dbParam_zip.ParameterName = "@Zip"
dbParam_zip.Value = zip
dbParam_zip.DbType = System.Data.DbType.StringFixedLength
dbCommand.Parameters.Add(dbParam_zip)
Dim dbParam_country As System.Data.IDataParameter = New System.Data.SqlClient.SqlParameter
dbParam_country.ParameterName = "@Country"
dbParam_country.Value = country
dbParam_country.DbType = System.Data.DbType.StringFixedLength
dbCommand.Parameters.Add(dbParam_country)
Dim dbParam_day_Phone As System.Data.IDataParameter = New System.Data.SqlClient.SqlParameter
dbParam_day_Phone.ParameterName = "@Day_Phone"
dbParam_day_Phone.Value = day_Phone
dbParam_day_Phone.DbType = System.Data.DbType.StringFixedLength
dbCommand.Parameters.Add(dbParam_day_Phone)
Dim dbParam_night_Phone As System.Data.IDataParameter = New System.Data.SqlClient.SqlParameter
dbParam_night_Phone.ParameterName = "@Night_Phone"
dbParam_night_Phone.Value = night_Phone
dbParam_night_Phone.DbType = System.Data.DbType.StringFixedLength
dbCommand.Parameters.Add(dbParam_night_Phone)
Dim dbParam_fax As System.Data.IDataParameter = New System.Data.SqlClient.SqlParameter
dbParam_fax.ParameterName = "@Fax"
dbParam_fax.Value = fax
dbParam_fax.DbType = System.Data.DbType.StringFixedLength
dbCommand.Parameters.Add(dbParam_fax)
Dim dbParam_email As System.Data.IDataParameter = New System.Data.SqlClient.SqlParameter
dbParam_email.ParameterName = "@Email"
dbParam_email.Value = email
dbParam_email.DbType = System.Data.DbType.StringFixedLength
dbCommand.Parameters.Add(dbParam_email)
Dim dbParam_web_Site As System.Data.IDataParameter = New System.Data.SqlClient.SqlParameter
dbParam_web_Site.ParameterName = "@Web_Site"
dbParam_web_Site.Value = web_Site
dbParam_web_Site.DbType = System.Data.DbType.StringFixedLength
dbCommand.Parameters.Add(dbParam_web_Site)
Dim rowsAffected As Integer = 0
dbConnection.Open()
Try
rowsAffected = dbCommand.ExecuteNonQuery
Finally
dbConnection.Close()
End Try
Return rowsAffected
End Function
The Sub that calls the Insert function
Public Sub Add_New_User()
m_User_ID = New Guid 'm_User_ID is the private field for the public User_ID Property
myData.InsertOneUser( _
User_ID, _
User_Type, _
Status, _
UserName, _
Password, _
Secret_Question, _
Secret_Answer, _
Company, _
Company_Type, _
First_Name, _
Last_Name, _
Address1, _
Address2, _
City, _
State, _
Zip, _
Country, _
Day_Phone, _
Night_Phone, _
Fax, _
Email, _
Web_Site)
End Sub
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Dec 5, 2005
I have a 3rd party app which creates tables for developers. It uses a guid as the unique key which is indexed. However none of these indexes are clustered. I have hear both good and bad about clustering on a GUID. i can't change this design other than to make these indexes clustered. Any opinions?
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Jun 7, 2002
Hi everybody
I have a table named GrpMembership which has columns ParticipantId and InterestGroupId that have datatypes uniqueidentifier.When I try to run the following insert stmt:
insert into grpmembership
(guparticipantid,guInterestGroupId,bIsAdmin,dtCrea ted)
values
({EE0BC83E-01DD-4B0D-BFAA-34B508C28CF3}
{D149BD88-55B6-4EB9-AA81-1E1B5141EFA6},
0,6/7/2002)
it gives error:
[Microsoft][ODBC SQL Server Driver]Syntax error or access violation
Please Help
Regards
Jignesh
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Aug 22, 2002
Does SQL Server 2000 (Enterprise Edition), mandate the creation of a GUID on each table used in transactional replication?
I was told that in addition to defining a Primary Key, I "MUST" also define a GUID on each table. As I recall - this is not true. Can someone who's setup Transactional Replication please field this question?
thx -
~BT
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Jun 19, 2001
If I return a GUID as an output parameter in an ASP page, it has curly braces around it. When I query the table in QA, there are no braces around it. Why is that.
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Jun 11, 2008
Dear Expert,
Iam new to sql server2000
I have table Table1 in that table I want to generate unique guid in one column.I want the code for that one kindly help me.
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May 8, 2006
Let's say that I have a database with 2 tables named 'TableA' and 'TableB'. Each one of those two tables contains the two fields 'MyKey' and 'MyData'. The field 'MyKey' has the type 'uniqueidentifier' and its default value is 'getnewid()'.
Now I would like to consider a third table named 'TableC' with two fields 'KeyRef' and 'MetaData'. The type of 'KeyRef' is 'uniqueidenfier' and corresponds to an element of either 'TableA' or 'TableB'.
If the GUID identifiers are trully unique then there is no issue to proceed that way (I am not consering perf matters here). On the contrary, if GUID are not unique, then there is a collision possibility.
My question is simply: can I consider the GUID to be unique in MS SQL Server (2000 or 2005).
Thanks in advance,
Joannès
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May 1, 2006
In Access, newID returns a unique for the table. In SQL Server, newid()returns a GUID - unique in the world. I do not need or desire thatcomplexity. Is there a way to get a simple unique int on the table inSQL Server?Brad Eckhttp://www.sitesdynamic.comhttp://www.basketsetcetera.com*** Sent via Developersdex http://www.developersdex.com ***
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Jun 19, 2007
Hi,
I am presently working on a ETL Process of importing data from XML source to the database (SQL Server 2000/2005).
I have GUID data in the XML file and i need to import that data into the database tables.
My Clarification is, if i import the GUID from XML to the database table, in the future, if the Database Engine generates new GUID's for new data, is there a posibility that the database engine might generate SAME guid as the one i imported from XML? As the GUID's in XML were not generated by the target Database Engine, can the database engine possibly generate the same GUID similar to the one i imported from XML?
Regards,
Vikram
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Jul 6, 2006
<BACKGROUND INFO> We are in the database design stage of creating a db and we plan to use a GUID as the primary key for our tables (the app will be a smart client and will need to support offline functionality so when the app comes back online and the queued up inserts come thru we want to ensure that the primary keys are unique). We plan to have the app generate the guid and to send the GUID over as a parameter i.e.
<code>GUID myPrimaryKey = GUID.NewID(); </code>
and will not be using the DEFAULT NEWID clause on the CREATE TABLE statements.
</BACKGROUND INFO>
<QUESTION > Is it better to make the data type for the primary key columns to be uniqueidentifier or should the datatype be varchar(36).</QUESTION>
I only ask this because the tables have already been created with the primary key columns having a datatype of varchar(36) and changing them would be a little bit of work. Not a big deal but don't want to do it if we don't have to. If its really advantageous we will go ahead and do it but if not we would like to leave it as is. Thanks for your thoughts!
Bo
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May 30, 2007
Hy! I am a beginner in SQLServer and I have to design a database with a lot of tables (30-50 tables). I have to choose a primary key for every table between an autoincrement and a GUID. If I choose autoincrement after an insert statement (from the client) I will have to go back to the server to get the value of the primary key which is a waste of time. On the other hand if I choose a GUID I can create the guid from the client and send him with the other values of the new row to the server and I have not to go back to the server. I am aware of the disk space of a guid field so which is the best for me: GUID or AUTOINCREMENT? Thank you!
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Aug 17, 2006
I have a project that uses GUID's througout and I'm completely stumped.
1) I create a "batch" GUID to batch the records I'm about to process.
2) I call a web service on a remote machine, and reserve the batch records by inserting the batch GUID into a string ---works fine
3)I call another web service that returns the rows that I just reserved as XML objects and insert into a string variable
4)I need to use the "batch"GUID variable which is typed as a string (DT_WSTR) as an added column so in a Data Flow Task I do the following:
a) use the XML string variable as the source of a XML Source Task -- works (now that I'm passing custom objects and not a dataset -- curious as to why I can't consume a dataset but thats a different question)
This is where things get tricky:
I've tried to add the BatchGUID as a derived column, as a datatype of DT_WSTR (unicode string) and convert it to uniqueidentifier in the Data Conversion task --- error, cannot convert unicode to uniqueidentifier (I know I can in C# and SQL Server so why not here).
I've tried to CAST the BatchGUID as a uniqueidentifier and pass that to the datasource -- again conversion error.
I've tried using the type Object and Casting to anything and that doesn't work either.
I've tried to pass the unicode all the way to the SQL Server Destination -- and insert into UniqueIdentifier field... again no go.
All help would be appreciated, at this point I can't see any way of using a UniqueIdentifier as a key field, and maintaining it through the package...
Is this a bug?
Oh and if you want to have some real fun, try returning the type of UniqueIdentifier as an output parameter using a ADO.NET connection.
Thanks!
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