Primary key must be unique....while inserting data into the database,i need to check whether the data already exist in the primary key column or not.......If not then only data will be inserted in the database else a msgbox will be displayed and data will not get inserted in the database....
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I have been working on a web based report from an existing client/server apps mssql database. I have a working query, that pulls this information together from many tables, and can provide the query and a result set if necessary.
The results currently are similar to this.
ID | Name1 | Date1 | Veh | PO | Stops
_________________________________________
1 | Bob 1 | 12/1 | Car | 1234 | 4
2 | Sam | 12/3 | Car2 | 2245 | 3
2 | Joe | 12/4 | Van1 | 5568 | 2
[Code]....
I am having major problems with creating my tables and populating them.The problem for the creating seems to lie when I try to create my table named WeeklyUnitStaffRota. I get the run time error 2147467259(80004005) No unique index found for the referenced field of the primary table. This has only started happening as I have been tinkering with my tables to get them to populate properly.I seem to have a problem when I have two columns with the same info but relating to a different college ie two MSC being run at 2 different colleges.[code]...
View 1 RepliesOn a client i have an anonymous list containing a multi-column primary key previously selected from the DB.Then i need to select all the records from the DB that equals the primary key list i have stored in the memory.[code]
View 1 RepliesHow i can import row from TABLE1 to TABLE2 without primary keyfield or adding correct value to primary key
i tried with two different codes, but result is same, it says: "In the column "Key"a constraint on the uniqueness.[code]...
I am using VB .Net to access the eBay API and store all completed orders in a database. This database is then fed into a proprietary shipping system, which can not handle an order number larger than 20 characters. eBay returns an order number like so 230407279314-680141236013 which is too long. The order number is always 12 numbers a hyphen and 12 more numbers. What I need to do, is turn this (the result can be alpha numerical) into a shorter, unique order key to store in my database alongside the true orderId (so that this can be referenced by the shipping software instead of the actual order number). The reason for the 20 character limit is the barcode algorithm used. Is there any way to achieve this in VB .Net 2010? This number can be anything unique, so long as it does not exist already (even a good uniqueid function would work, but I would have to query the database to make sure it isn't taken)
View 2 RepliesI'm using the datagridview. This is the sample data:
[Code]....
How do I parse through the grid to rename the duplicate values in a particular column (in this example it's the l_name field) into such a format?
[Code]....
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
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim FILE_NAME As String = Server.MapPath("counts.vbi")
[Code].....
Unique constraint - these columns currently doesn't have unique values..?? I have created Unique Constraint with 3 columns. My code works perfectly but once - two users @ same time entered same data and somehow it saved in DB; after that incident. This UniqueConstraint gives me error - These columns currently doesn't have unique values. How can I check if user enters this kind of entry or how can I restrict the Entry?
View 2 RepliesThis my working method to send a email
Sub emailConfirm()
Dim email As String = txtMail.Text
Dim name As String = txtPrenom.Text + txtNom.Text[code]....
note:I want to send Link contains a unique identifier and verify the unique identifier in the login.aspx.I don't know when to do this...I found nothing interesting on the net ...
Is it possible to have a Foreign Key as the Primary Key?
<Key()>
Public Property AssignmentID() As Integer
<ForeignKey("AssignmentID")>
Public Overridable Property Assignment As Assignment
Public Overridable Property User As User
For the code above I get an error:One or more validation errors were detected during model generation:System.Data.Edm.EdmAssociationEnd: : Multiplicity is not valid in Role 'AssignmentLocks_Assignment_Source' in relationship 'AssignmentLocks_Assignment'. Because the Dependent Role refers to the key properties, the upper bound of the multiplicity of the Dependent Role must be �1�.
I'm trying to create a table which has one (or none) record per assignment.
I have a database running on SQL server primary key is all set, my question is i dont want to allow duplicates in the primary key, i want everything to be uniqure. The database already has information in it, is there a away to set it so when i add a new row through the table adapter that it will recognise the last primary key value and increment it by +1?
View 4 Repliesi has create system registration that use vb.net 2008 & accessdatabase (oledb connection).i set ID
as primary key,when i insert new ID but if ID already in database i will get error cz data
duplicates..so anyone know any code that will promp mesej like this "Data already in data base,
insert ID corectly" if data already in accessdatabase.
I'm currently using this to get an object by it's primary key value.
I'm trying to find a way to create a similar method GetByIDs where I can pass an IEnumerable(of object) and do ids.contains(pk), but there's no Contains expression.
Public Function GetByID(Of T As Class)(ByVal pk As Object) As T
Dim itemParam = Expression.Parameter(GetType(T), "item")
Return GetTable(Of T).Single(
[Code].....
I' m trying to get the primary key which is "TestID" through the code below but I get an error "Range variable "testid" hides a variable in an enclosing block or a range variable previously defined in the query expression." What does this error mean ?
Dim oo As New DataClassesDataContext
Dim o = (From k In oo.Tests
Where k.Category.Equals(tempcategory) And k.Level.Equals("1")
[code]....
i am trying to make a customer registration form. On the form i want to display the employee ID or Employee name who is servring or registring the customer. In short the employee who is logged in the system ,his Name or id should appear in the customer registration text box where the label says "served by"txtEmpName.Text
View 3 RepliesHow do i reset a primary key to "0" at midnight For Every Day of the week. I would like To Start a fresh day @ "0" But keep The Information the I have. Previously Put in (it is For a booking program I am trying to create)
View 3 RepliesI m trying to make a simeple project in visual basic 2005 using visual studio 2005 sp1.
For isolating the problem i have just created project with a single form.
The form contains a masked text box (mask allows numeric(5 digits) int32 value )and a button named FIND.
Then i clicked on add a new data source wizard and added a data source (Microsoft.Jet.OLEDB.4.0 provider) and a microsoft access database (Library Management Project.mdb) . the database has a 5 digit primary key column named -BOOK_ID
i selected no when asked whether i want to add the local database to the output directory and modify connection.
then selected yes when asked whether i want to save the connection string.
then selected everythng when asked what database objects i want to add to dataset.
What i want the project to do when a person enters 5 digit integer value in masked text box and clicks the button FIND
a message should be displayed telling whether this value matches any of the primary key values.
so i wrote under the button click event
Dim DataRow As Library_Management_ProjectDataSet.BookDetailsRow
datarow = Library_Management_ProjectDataSet.BookDetails.newBookDetailsRow
i get an error saying "Reference to a non-shared member requires an object reference.
the msdn library says above two lines shldnt give error.
I m not able to solve this.
However i have not added anything other than masked text box and a button to the form. DO i have to add dataset to the form also ??
I just read that I cannot use a CommandBuilder for an Excel sheet as it has no primary key. (Wish I'd known that! I have to use Excel as the file is distributed elsewhere). I need to create commands manually. As a TEST sheet in Excel I have created 6 columns of data and loaded this data to a DataAdapter, then directly to a DataTable. A connection is made and the data is displayed in a DataGridView. I want to Update changes I typed manually in the DataGridView. The following code example I found manually builds an INSERT Command. But is the last part of the example code valid for UPDATE and DELETE? I'm trying to copy all changed data back to the Excel sheet.[code]...
View 21 Repliesin vb.net while entering a new entry i want to assign a record a unique id like in case of numeric i do this way
Dim ItemID As Integer
KAYAReqConn.Open()
SQLCmd = New SqlCommand("SELECT ISNULL(MAX(ItemID),0) AS ItemID from MstItem", ReqConn)
[Code]....
in this case m using itemid as a unique id and the format is 1,2,3... and m finding out the max and assigning to a new record but how to assign if the previous id is of the a00001,a00002,a00003,a00004...so on. how i do i produce a unique id in this case
i am trying to write a code in which i need to perform a update but on primary keys how do i achieve it
i have written the following code: kindly look at it let me know where m wrong
[Code]...
i am trying to write a code in which i need to perform a update but on primary keys how do i achieve iti have written the following code:
Protected Sub rgKMSLoc_UpdateCommand(ByVal source As Object, ByVal e As Telerik.Web.UI.GridCommandEventArgs) Handles rgKMSLoc.UpdateCommand
Try
KAYAReqConn.Open()
[code]....
After days of labouring, debugging and researching, im on the 3rd to last line and im stuck. This isnt the full code, but the relevant parts.
Dim dbProvider As String
Dim dbSource As String
Dim con As New OleDb.OleDbConnection
[Code].....
I understand this means my table doesnt have a primary key, but i have set one.
I would like to have some explaination about the characteristics of a primary key in the table of such database. This is for vb 2008 express edition,since im new to this language,if this is true, as far as i understand about the characteristic in setting the primary key on each field for true.My question is if you are doing an updates/edit records in your table using the DataContext,if you setup the primary key for true of one of your field in the table it would edit all records in one datarow but if you put the primary key for true in all fields except one of them,all the records in the data column of that field which primary key is false could be edited.Basically its impossible to edit all records in the datarow and all the records in the datacolumn of the table in such one event. Is there any further explaination about the characteristics of primary key in the table?
View 1 RepliesWhen adding a new row to a datatable using me.bindingsource.addnew()
is it possible to copy the previous row except for the primary key?
So lets say my columns are "priKey" "Col1" " Col2" the previous lines of Col1 and Col2 are copied but not the prikey so the key can autoincrement
I'm trying to query a datatable to establish the primary key [identity column], by querying each columns autoincrement property. However its always false (for the column which is the Idenity/PK).
Querying the tables primary key collection reveals that the datatable doesn't think it has a PK.;
Dim dc As DataColumn() = dt.PrimaryKey
Debug.WriteLine(dc.Count) 'Result is 0
[Code]....
How can I determine the primary gateway (ie: my router) for my default Network adapter? I found this thread but it doesn't work on all machines; ie: computer has Hamachi. I've got this function that returns the proper IP however, I just need to correlate it with the gateway it uses:
Public Function LocalIP() As String
' Obtain the first address of local machine with addressing scheme
For Each IP As IPAddress In GetHostEntry(GetHostName()).AddressList
[Code]....
I have piece of code as follows(using vb 2005)[code]...
and I have the following to display the data in DataGirdView
dgvWorkList.DataSource = myWorkDataSet.Tables("WorkListTable").DefaultView
My question is that how I can exlucde the value of Primary Key in DataGridView(I do not want to display the primary key value in DataGridView(dgvWorkList)).
I can not write the sqlStr to exclude the primary key becuase I am using the following code segmanet to update the Data myWorkDa.Update(myWorkDataSet.Tables("WorkListTable")) myWorkDataSet.AcceptChanges()
I want to be able to get some data from my database table, given the value of the primary key. This is what I have so far:
projectName = DbDataSet.Projects.FindByid(projectId).name
where projectName is a String, and DbDataSet is my dataset. The variable projectId is the ID of the row I want to extract the data from, but every time I run my code I get a NullReferenceException.
I know that the row with the primary key value of projectId exists because I can see it when I view through server explorer.
How to apply primary key on sno column in the following dataset. [code]
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