Is it possible to allow repeated nulls on a column with a unique constraint? This column will won't always be populated with data upon insert, a condition must be met before the value is update. Once updated, it needs to be unique. Do I need to assign a temporary, random value or
View 1 RepliesI have tables:
MAILBOX
MailboxId int PK
MailboxTypeId int FK
MAILBOXTYPES
MailboxTypeId int PK
I can't make relationship between MailboxTypeId in table MAILBOXTYPES and MailboxTypeId in table MAILBOX why ?
When I get an exception message like this I want an Exception Class name to compare.Not wantto compare a string to match with substring.when I get an unique constraint error like this below how can I control if error exception type is exactly sqlserver unique constraint error ?:
catch (Exception ex)
{ if (ex.class==SQLUniqueException) blahblah();
};
Using vb.net/asp.net 2005 and SQL Server 2005:I have a unique constraint setup to prevent users from entering duplicate email addresses in my online system.When a user tries to edit an existing email to one that already exists (add a duplicate) it shows the following<ERROR>Cannot insert duplicate key row in ojbect "dbo.someTableName" with unique index.....The statement has been terminated This prevents the user from adding duplicates which is good but I would like to provide a more user friendly exception message and I do not want to show the table and field names to the user.
View 4 RepliesI'm new to asp.net and I'm building a project in which I send data to a database MSSQL, I've set a constraintname on some fields that I wantto be unique, now how do I catch that error when people insert a duble and handle it with a redirectionto custom error pagehere the code just in case you need it
Dim con As New System.Data.SqlClient.SqlConnection
con.ConnectionString = "Data Source=localhost;Initial Catalog=Database1;User ID=user;Password=password;TrustServerCertificate=True"
Dim myCommand As New System.Data.SqlClient.SqlCommand
myCommand.CommandText = "INSERT INTO serves(CategoryID,UserId,vote, Img, link, Description) VALUES('" & DropDownList1.SelectedValue & "','" & UId.Text & " ' ,1,'" & TextBox1.Text & "','" & "<a href=" + TextBox2.Text + ">" + TextBox4.Text + "</a>" &
"','" & TextBox3.Text & "')"
myCommand.Connection = con
con.Open()
myCommand.ExecuteNonQuery()
have a look at my code below and tell me where i am going wrong.
case "particulars.aspx":
dt = JobCardManager.GetParticularsByJobId(id);
hidJobId.Value = id.ToString();
if (dt != null && dt.Rows.Count > 0)
{
gvParticulars.DataSource = dt;
gvParticulars.DataBind();
else
[code]...
I know this is a newbie question but, alas , that's what I am. How do I keep values in specifc sql server table unique, in other words how do I prevent any duplicates happening upon creating (inserting) a new table row?
View 5 Repliesenvironment: VS2008, MySQL 5.1.45, .net Connector 6.2.2
Error msg:
NoNullAllowedException: Column 'idNames' does not allow nulls.
The MySQL DB has on "idNames" (Primary Key) a tick-mark for: primary Key, Not Null, Auto-Increment Also: I can add/retrieve records via the 'MySQL Query Browser'; I see the data via VS2008 'Preview Data'!
As said in the comment below; when the 'idNames' is explicitely given the rows.add works fine. So it seems that I miss something around the 'auto-increment' business!
[code].....
tbl_table1
ID primarykey (autoinc)
UserId uniqueidentifier
IdNumber primarykey int
I'd like to have a relationship between two tables.
I developed a site for a client a couple of years ago. It uses the the standard ASP.NET Membership, authentication, etc. I just added the profile section with (2) fields: CustID AgntID. Now whenever I load the page with any Profile code in it I receive this error: Violation of UNIQUE KEY constraint 'IX_aspnet_Users'. Cannot insert duplicate key in object 'dbo.aspnet_Users'. The INSERT statement conflicted with the FOREIGN KEY constraint "FK__aspnet_Pr__UserI__3CA9F2BB". The conflict occurred in database "broo001", table "dbo.aspnet_Users", column 'UserId'. The statement has been terminated. The statement has been terminated. 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: Violation of UNIQUE KEY constraint 'IX_aspnet_Users'. Cannot insert duplicate key in object 'dbo.aspnet_Users'. The INSERT statement conflicted with the FOREIGN KEY constraint "FK__aspnet_Pr__UserI__3CA9F2BB". The conflict occurred in database "broo001", table "dbo.aspnet_Users", column 'UserId'. The statement has been terminated. The statement has been terminated. Source Error:
[Code]....
Stack Trace:
[Code]....
Here is the code from my web.config:
[Code]....
Here is some of my page code:
[Code]....
My attendance table structure as follow
EmplID AttendanceDate Atten_Type Atten_Taken
it mean it has lot od data like below with differnet dates
E1
2011-02-21 00:00:00 CL
1
E2
2011-02-21 00:00:00 P
E1
2011-02-22 00:00:00 CL
E2
2011-02-22 00:00:00 P
E1
2011-02-23 00:00:00 CL
[code]...
i have many to many RelationShip and repesnt it in GridView without any problem but the real problem when draw Data the same row repeated with anther item
for example :
i have table
A with data
1 2 3
and table B
with data
a
b
grid view Draw data as
1 2 3 a
1 2 3 b
but i want
1 2 3 a,b
My filter Expression was working fine with filtering by Control Parameters.When I added the Phone Parameter it went nuts - with the Phone Parameter the GridView just Comes out blank upon loading the page (without it would show Select * from Individuals)Is it because the phone field is populated with numbers? Don't get it.... In the SQL server the 'phone' field is set to 'varchar(30)' and nulls are allowed.here is my code:
[Code]....
I have a table with three fields, User, City and Country, where exactly one of the fields must be non-NULL at all times. Can I use an SQL constraint for this or should I rethink what I'm doing?
The scenario is that my database should contain documents that can be attached to users, cities or countries. So a row in this table contains exactly one document for either a user, a city or a country. However, one should be able to search for all documents as well, regardless of what entity it has been "attached" to.
The reason I'm not using three different tables instead is that I want to avoid having to JOIN the three tables when searching for documents in all of the three places. I'm imagining that the kind of denormalization I'm attempting to use here will improve performance.
I'm trying to remove a user from the aspnet_Users table.
[Code]....
I received the following error during my try-catch test:
System.Data.SqlClient.SqlException was caught Message=The DELETE statement conflicted with the REFERENCE constraint "FK_lusHmoob_aspnet_Users". The conflict occurred in database "laujtsov", table
"laujAdmin.lusHmoob", column 'whoInsert'.
The statement has been terminated.
Source=.Net SqlClient Data Provider
ErrorCode=-2146232060
[Code].....
The UPDATE statement conflicted with the FOREIGN KEY constraint "FK__Software__Packag__5165187F". The conflict occurred in database "StudentDB", table "dbo.Package", column 'PackageID'. The statement has been terminated.
what i try to do is run this;
[code]....
let say i have 2 table (PARENT and STUDENT table)
the structure for both table are
STUDENT
PARENT
student_id (PK) parent_id (PK)
student_parent (FK) parent_status (the value is either ACTIVE OR INACTIVE)
- parent_id is refer by STUDENT table as a foreign key
- now i want to inactive the status for parent
- i want my system pop out a message something like "The parent you want to inactive is refer by a student, inactive is not allow"
- is it any constraint in SQL Server 2005 to help me check whether parent it is refer by student table? The concept i want to use is something like delete constraint in SQL Server 2005 mean it is not allow to delete a person who is refer by a student in STUDENT table.
I'd really like to know how to do the same thing in my code as going into sql server management studio, clicking on the design of a table, and then from the file menu scrolling to the relationships and disabling the foreign key constraint by selecting no to the 'enforce foreign key constraint'.
View 2 Repliesi have a bizar situation, i have a SSIS package which imports records from a flatfile.First i get rid of all the double records, so I keep only unique records before I put them into the desired table.I have put a dataviewer on the flow and notice that there are no duplicate records, and though the SSIS package fails with a violoation of a promary key constraint.Hs anyone seen this before? It is really strange.
View 1 RepliesI have a SQL Server 2000 table with 7 columns and would like to add a constraint that prevents a row being added with the same value for both Col2 and Col3.
So, for example, if Col2 = 205 and Col3 = 5, then the constraint should prevent inserting another row with the values for Col2 = 205 and Col3 = 5.
The following is an example of what I would like to prevent:
Col1 Col2 Col3 Col4 Col5 Col6
1 205 5 1 1 1
2 205 5 0 0 0
I am using a datalist to display data from a database.Except for 1 column all the other column values are getting repeated so I am hiding all the other column values when the datalist repeats itself.However, the unique column value is not getting rendered properly because there are many line breaks in between.I am not using any web control to display the static text and I am not sure if that would help.I just want to improve the final display so that the datalist looks consistent.I am attaching my code.
[Code]....
I try to create one CONSTRAINT in Sql Server 2008 which checked that:
if Frecuencia = 0 then EsPar <> null
I try to do this:
ALTER TABLE [IngresoxConsorcio] WITH NOCHECK
ADD CONSTRAINT CheckBimestral
CHECK(Frecuencia = 2 AND EsPar <> null)
But obviously don't works
How to get Unique ID of LDAP logged in User? Is GUID is the unique id of each user?
View 1 RepliesIs GUID (globally unique identifier) really unique, or it can be duplicate.
System.Guid.NewGuid().ToString()
How generate the unique no. 1,2,3 and so on .... on button click of each new user ..
the code mentioned below is a readwrite coding in vb.net ...
but the problem is it generate the same id for different users on button click event... but i want the no. of times button clicked the new ids will be generated
[code]....