VS 2008 SQL - With A Unique Column?

Mar 31, 2009

Alright, I have this Access Database. It has 6 Columns: ID | Class Name | Class Code | Class Room | Grade | Teacher

My ID is the Unique Column that I need to reference back too when Updating my other Fields so I get the correct field.How do I do this? Properly.I've been thinking of a method but I doubt it would work.First I would start off selecting all the ID's and then LOOP through all of them, and then rewrite them to to + 1 Each time I make a Delete, so Each Time it will be a consistent 1 2 3 4 5 6 7 8 9 10 .... etc... Then I can reference from that to my Combo Box Selected Index + 1 to get the Correct Row which corresponds with the Selected Item.Will this work? Or will I still need a Unique Fields that I reference back too.

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VS 2008 Get The First Unique Column?

Nov 25, 2010

I have a matrix which is in a text file.

ABMS101848 T G
ABMS101848 C H
ABMS101848 A S
SDFR236176 D Q
SDFR236176 2 X

[Code]...

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VS 2008 : Get Unique Value Of A Column Of A Datagridview?

Jun 19, 2010

i need to get only unique value of a column of a datagridview es:

COMLUMN
value1
value2
value3

[code]....

and get only:

value1, value2, value3, value4

how i can do this?? is possibile make a quaery into datagridview?

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VS 2008 SQL - Update With A Unique Column?

Oct 1, 2009

I have this Access Database. It has 6 Columns: ID | Class Name | Class Code | Class Room | Grade | Teacher My ID is the Unique Column that I need to reference back too when Updating my other Fields so I get the correct field. How do I do this? Properly.

I've been thinking of a method but I doubt it would work. First I would start off selecting all the ID's and then LOOP through all of them, and then rewrite them to to + 1 Each time I make a Delete, so Each Time it will be a consistent 1 2 3 4 5 6 7 8 9 10 .... etc... Then I can reference from that to my Combo Box Selected Index + 1 to get the Correct Row which corresponds with the Selected Item.

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VS 2008 - How To Get Unique Values From Specified Column Of DataTable

Jun 16, 2009

I'm trying to make a method that can get unique values from a specified column of a DataTable. The problem is that the column may be string, integer, etc. I'm not sure what type of variable the (Of T) is.

Private Sub GetColumnUnique(ByVal dbTable As DataTable, ByVal ColumnNumber As Integer, ByVal ColumnType As ???)
Dim results As List(ColumnType) = (From item In dbTable.AsEnumerable Select item.Field(ColumnType)(ColumnNumber)).Distinct.ToList
End Sub

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VS 2008 : Set A Column To Accept Only Unique Values?

Nov 30, 2009

Is there any way to set a column to accept only unique values?(Via Table Definition)

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[2008] Datagridview - Duplicate Cell Values [non-unique To Unique By Appending]

Jan 10, 2009

I'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]....

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Column's Value Is Likely To Be Unique 90% Of Time

Jul 15, 2010

For each loop through a DataSet, I need to store the values of 2 columns (we'll call them ColumnA and ColumnB) so that I can use them to search the same DataSet again later.The DataSet stores the results of a search and places the value of ColumnA into a ListBox as a new item.When the user clicks on this ListBox item, the application will loop through the DataSet again using the value of ColumnA and the value of ColumnB as criteria to identify the correct row in the DataSet to return.This would be a lot simpler if the value for ColumnA was unique every time, but a value will inevitably be repeated on occasion. That's where ColumnB comes in. This column's value is likely to be unique 90% of the time, and, given the nature of the information in the DataSet, if either column duplicates, the other won't.So I've thought of adding the values for ColumnA and ColumnB into a 2 dimensional dynamic array, but I'm doing something wrong apparently.[code]

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Know If The Table Column Is Unique?

Mar 15, 2012

currently, what i want to do is, add a column in a table "default" during runtime. Well, I've got that covered already.

The problem is, the column names are actually taken from the users input through a textbox or drop down list and of course, if the same column is added already in the table, it generates an error since it has to be unique.

That is why i wonder if it is possible to know if a column already exists without viewing the form which contains the grid view of that table?

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Put Unique Value To Column In A Table?

May 21, 2011

Is there a quick way to put unique value to column in a table? Assuming I want numeric values starting from 0.

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BindingNavigator With DATAGRIDVIEW - Error: Column Name Is Unique

Jun 16, 2009

I'm using vb.net on vb 2005, I create datagrid view that when i click search button on the main form. It will show datagrid view that I want and when i click OK to select any record, the selected record will show on the desire text box in the main form. The problem is the record i choose is record no. 5 of all 10 record but the Bindingnavigator tools bar show that it's the first record of all 10 and when I click Next record arrow, the error message show that the 'PK column name' is unique and the 'value of the PK from my selected record' is already exist. [Code]

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Create Unique Numbers And Insert Them In Column 'ID'

Jul 8, 2009

For my database I need to create unique numbers and insert them in the column "ID". Can I add them via a SQL query? The numbers would simply be 0001 to whatever.I'm using the "Show Table Data" gui.

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DB/Reporting :: Column 'TYPE' Is Constrained To Be Unique?

Feb 20, 2009

I'm using vb2005. I'm writing a little application which allows a person to type in a new value in a combobox (which I've bound to a field in a table) which can be updated to the database. I then refresh the dataAdapter by clearing it and re-filling it again when the user saves a new item. That part works fine. My problem occurs when the user selects a stationary item from the combobox. The first select works fine until they try to select another item. Then I get the following error: ConstraintException was unhandled: Column 'TYPE' is constrained to be unique. Value 'False' is already present.

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Error Column 'Item ID' Is Constrained To Be Unique

Jun 5, 2011

I have this error, error Column 'Item ID' is constrained to be unique, what do I have to do to change it and the code

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Get A Subset Of Unique Values In Column(1) Of A DataView?

Dec 16, 2009

Is there a way to get a subset of Unique values in column(1) of a DataView?

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GridView - Hiding Unique Column From Users

Sep 30, 2010

My query returns 4 columns. One column is a unique identifier for the record. I'm trying to hide that column so the user doesn't see it. I'm going to add an edit button and hopefully I'll be able to allow the user to click on the record's edit button and edit only one of the remaining 3 columns and I expect I'll need that hidden value to do the update. I've got code below but it doesn't work. It gives me an exception, "Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index ".

Dim MySqlCommand As New SqlCommand
MySqlCommand.Connection = MySqlConnection
MySqlCommand.CommandText = "SELECT ..................."
MySqlConnection.Open()
GridView1.DataSource = MySqlCommand.ExecuteReader
[Code] .....

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Way To Allow Only Unique Values In A Column Of An Infragistics UltraWinGrid?

Mar 21, 2012

I'm using an Infragistics UltraWinGrid with a column of drop-down boxes. I don't want the user to be able to select the same value for multiple rows in that column. Is there a simple (or heck, I'd settle for advanced) way to do this? I'm using VB.NET

-EDIT-

I tried setting a filter on the data source for the drop-down box. But when I did that, the values in the other boxes in that column started disappearing (not the values themselves, but the descriptions that they were supposed to represent, so instead of reading "Information", it just said "1"). All of the cells in a column refer to the same combo box, so if you filter out a value from the data source for one of them, you filter it out for all of them. I'm currently trying to catch a CellChange event and check against all other currently-used values. If it was already used, I would put up a message saying as much and revert back to the old value. However, the value comes back as the previously-saved one, so... not helpful. About to see if I can use the "text" property.

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Query A DataTable To Find All Of The Unique Values In A Column?

May 7, 2010

How can I query a DataTable to find all of the unique values in a column? SQL has the 'unique' or 'distinct' keywords, but I dont know how to do this against a DataTable.

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Create A Fixed-length Unique String From Another Unique Numerical Value That Is Too Long?

Feb 13, 2012

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)

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Asp.net - Unique Number For Unique Visitor On Button Click?

Mar 21, 2011

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].....

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Datagridview Error "System.Data.ConstraintException: Column 'Name' Is Constrained To Be Unique" Handling

Nov 13, 2009

I have a datagridview that seems to be working fine until the user adds a name into the unique name column that already exists. I am getting this: System.Data.ConstraintException: Column 'Name' is constrained to be unique. Value 'test' is already present. where and how I capture this error and prevent the users from adding another name, case insensitive, to prevent this huge error from coming up?

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Unique Constraint - Columns Currently Not Have Unique Values?

May 8, 2011

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?

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Send Link Contains A Unique Identifier And Verify The Unique Identifier In The Login.aspx?

Jan 6, 2012

This 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 ...

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VS 2008 Add Datarow With Unique Identifier?

Oct 13, 2010

I have a table in an SQL database bound to a datagridview and am having an issue with understanding what happens when I add a new data row.

My datatable is built in code with the first column created using this sql command...

vb

cmdString = String.Format("CREATE TABLE {0} ({1} INT IDENTITY(1,1) NOT NULL, ", tableName, columnNames(0))

after that there a a number of other columns added to the command to build the table. After the table is created, I fill the datatable and bind the datagridview using this code....

vb
Dim cmdString As String = String.Format("SELECT * FROM {0}", DB_DATALOG_TABLE_NAME)
DataLogAdapter = New SqlDataAdapter(cmdString, dBConnection)
DataLogTable = New DataTable

[Code].....

This is where my understanding is falling. Because I have created the datatable's first column with the NOT NULL key word, an exception throws when I try to update the data adapter because the first column of the data row is empty By creating the table with the first column the IDENTITY key word, doesn't that imply that the database will generate the value for that column? If so, when I add a new datarow, how does the identity column get filled?

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VS 2008 Generating Unique IDs In A Table?

Dec 6, 2009

creating unique IDs for each row in a table, to avoid duplicates when inserting the data to a server. The table looks like this:

+--------------+----------+------+-------------+
| brikkenummer | tid | post | anvendt_tid |
+--------------+----------+------+-------------+
| 3086360 | 09:43:02 | 98 | 09:43:02 |

[code]....

"Brikkenummer" is the number of a device that each person carries with him/her, and "tid" is the time the runner has passed a specific post. The post he/her has passed is described in the column "post".Out of these three columns, is it possible to generate some kind of unique ID? The ID that is generated have to be the same if a row is displayed twice or more, to avoid duplicate entries.

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VS 2008 Unique Only Data In String?

May 4, 2010

My goal is to make the string ...

vb
strLocations = "WI - WI IL"
to

[code]....

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VS 2008 - Creating Unique File Names?

Dec 22, 2009

I am creating files and then allowing the User to browse through the files via a ComboBox. I decided to name each file the current date. In order to create multiple reports each time the application is ran, each report needs a unique name.

The idea is that if they run a report once a day they'll have a unique report each day. But, then I realized that it is feasible that User could run a report more than once a day. So, I decided to create an integer and increment it each time the report has been ran. Then append the file name with that integer. So, report one of that day would show something like this:

12-22-2009_1 and so on.And this works just fine. But, if the user decides to close the app and then run the report later that day, the variable has been reset and no longer works as needed.I'm using a StreamWriter to create the file.

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VS 2008 What Info Can Retrieve That Is Unique To Each Computer

Aug 11, 2010

Basically I'm adding a registration feature into my program, or a similar thing to that. So, when you purchase you can install up to 3 copies (for example), but not more.To do this, I need to know some kind of information that is unique to each computer (to store in my database online), I thought of the name of the computer, but that isn't unique, obviously.

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VS 2008 Creating Own Security For App / How To Get Unique Computer Id Number

Apr 16, 2010

I've seen threads on this topic posted before but they didn't come up in the search that I did. What's the best way to get a computer id code of some kind that is unique for each computer so I could use that to create a unique software activation code?Does Visual Basic have any staements that can give you this kind of information.

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VS 2008 - Create A Linq Filter To Select Only Unique Records For TableName + PKs

May 22, 2011

Basically i have a list(of TransRecord)

vb Public Class TransRecord
Public TableName As String
Public PKs As String

[CODE]...

And want to create a linq filter to select only unique records for TableName + PKs (group by) ... but want it to select only the record with the highest ID for this group by.

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