I hope someone can help me. I have an ATM machine connected to a server. A form takes a textBox entry as a PIN number and matches it to a card number in the same table which is the primary key. The card number is in a comboBox.Selected Item. I have used a dataset to fill the comboBox as the form loads. I have tried for days and got nowhere.
View 6 RepliesI am looking to programme a button to check if an entry from a textbox exists within a table.
This will done via a button.
how I would code the button to make it query the table?
I have an entry with a primary key field but needs to update other fields. However, when I update the fields my grid does not save my update, or nothing happens.
View 1 Repliesi connect database with vb.net and also i receive a single value from my receiver through serial port. now i want to match this single data with one field of database. i have attached my code.
Public Class Form1
Private Sub OPEN_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
[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 RepliesI have an access database with 4 tables and two of the tables have absolutely no need for a unique field that would be a primary key. One will only have one record and the other is a detail table for two master tables. I of course get an error like "UpdateCommand is not supported against a SelectCommand that does not return any key column information." when I try to save. Do I have to just create a primary field key I don't need or is there a work around for this?
View 4 RepliesFor a project i am working on, i am taking bookings. These bookings are stored in a database alongside a users personal details. The personal details are assigned an ID according to the user who booked it. A user can book more than once with different personal details.
My problem is that i want a user to be able to edit a booking. I want a list of all the names that user booked to be listed in a combo box. This is the part i am having trouble with. i am using an access database and using sql statements to pull out the data. This is what i have tried so far:
SELECT [First Name]
FROM PersonalDetails
GROUP BY [First Name], UserID
HAVING (UserID = ?)
If i execute this query in the query editor, it works and shows the two records currently assigned the input id. However, if i try to output this to, for example, a text box, then it remains blank. I am assuming thisis because there is more than one output, but i'm not sure.
[Code]....
It is returning all the columns by id. I need only the primary key. When I add the following line it is empty: WHERE SIK.indid = 1 Why is that? Is there other ways to do the same thing and working? Since I am in the rush
I'm having some problems trying to input records into a relational database. The design is really simple but I'm running into a wall when it comes to having the foreign key from my child table autopopulate the primary key from the parent table. I've made the connections in Access and from what I understood, so long as I committed a transaction, the child table would populate the primary key from the parent table. This is not happening.
my question is: is there a method that would do what I'm looking for? or am I cornered into using @@IDENTITY and manually inserting the primary key into the child table?
I've tried using datasets and data adapters and created a datarelation within the dataset, but it is still not doing what I need. everything I've tried thus far has allowed me to insert records into multiple tables, but won't relate them because of the missing primary key in the child table.
So I have a program that I am converting to .NET FW 3.5 and I am getting the titled exception on the following line:If IsNothing(dsTopPI.Rows.Find(profile.Item("GEMSID"))) Then Continue For
which is in a for each loop. The thing is, I have set the primary key and when I put in the following code:Dim columns() = DSTop30Profiles1.DTtop30profiles.PrimaryKey Console.WriteLine("Column count: " & columns.Length.ToString)For a = 0 To columns.GetUpperBound(0)Console.WriteLine(columns(a).ColumnName & " - " & columns(a).DataType.ToString)Next
I get this in the output:Column count: 1 GEMSID - System.Int32
That would seem to indicate that there is in fact a primary key, right?
Storage Unit application, 5 buildings, 107 Units split between the 5 buildings.frmBuildings is a form with:(from the botton up) 1 TLP 5 columns 2 rows5 Group Boxes, 1 per column, Group Box 1 & 2 each have a TLP with 2 columns & 3 rows. 107 buttons on the form that represent each building.The idea is that I want to change the BackColor of any button that represents an Available unit. This is a multi tier applaicationData Access Layer query function:
' Method name: getStorageUnitsAvailable
' Purpose: to return a Data Table from data base
' Parameters: none
[code].....
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 explanation about the characteristics of primary key in the table?
View 1 RepliesHow would i get the primary key id number from a Table WITHOUT making a second trip to the database in LINQ To SQL?
right now, i submit the data to a table, and make another trip to figure out what id was assigned to the new field (in an auto increment id field). I want to do this in LINQ To SQL and not in Raw SQL (I no longer use Raw SQL).
also, seond part of my question is: i am always careful to know the id of a user thats online because i'd rather call their information in various tables using their id as opposed to using a guid or a username, which are all long strings... i do this because i think that SQL Server doing a numeric compare is much (tentative use of the word 'much') more efficient than doing a username (string) or even a guid (very long string) compare.
What's the syntax for an Update query for a table without a primary key?Disclaimer: Frustratingly, adding a primary key is not an option. My program is a small program in a much larger system with poor data management. My development time does not include rewriting the other software.
Note: The database is Microsoft Access.
Note: Similar to: Excel: TableAdapter UpdateCommand for table without primary key
UPDATE: Am I correct in saying, "If the table in the database has no explicit primary key, then there can be no valid TableAdapter UpdateCommand?"
Ok i have 3 tables in a dataset
Table1 contains items for sale (referenced)
Table2 contains Stores (Parent)
Table3 Contains items in a particular store (Child)
the problem is the data in this case. Table 2 contains a StoreId field as a primary key. Table1 Contains an ItemId field. My problem is in table 3 this contains 3 fields, StoreId, Name and Quantity.
Now my Table1 contains a field called Name and one called PluralName, I need to determine which field in table one relates to the Name field in table3.
The following 2 constraints exist currently in my app
Table2 - StoreId (one) to Table3 - StoreId (many)
Table1 - Name (one) to Table3 - Name (one)
can i add another constraint :- Table1 - PluralName (one) to Table3 - Name (one) ???
I am presuming if i do i will get a constraint error as the property does not relate on a one to one level if the store has more than one item in stock and vice versa when it has only one in stock.
I have a VB2008 Windows Form with a SDF database. The database contains two tables. The following query returns the records in DiskInfo that have a matching DiskNumber in the DataInfo table. How do I get it to return records in DiskInfo that DO NOT having a matching DIskNumber in the DataInfo table?
Dim DiskQuery = From DQ in DiskInfo join DI in DataInfo on DQ.DiskNumber equals DI.DiskNumber Order By DQ.DiskNumber select DQ
I am trying to append multiple rows in a SQL Server.I have connected to the MS SQL Server and with a DataAdapter, I have downloaded the Table into a DataTable and displayed it in DataGridView.I now want to programatically enter multiple rows into the DataTable and later to update the SQL Table.
I am trying to build an application to do this generically.The problem I have is that the Table and DataTable has an 'ID' Field. In the SQL DB, i is an Auto-incrementing field.When the code loops through creating new rows and entering field values, how do I handle the ID Field that is the Primary Key?
I have setup a page in Excel with several textboxes for data entry. I would like to be able to tab from textbox to textbox so I can enter this data as quickly as possible.
View 3 RepliesI have ListView with records (2 columns), I have also TextBox. I want when i type something in the textbox and if there is a match to select me that row of the ListView and if there isnt a match there will be MsgBox. I`ve succeeded to do it with 1st column. But if i try to use records from 2nd column it doesnt happen anything. Here is the code for TextBox_TextChanged that is working with 1 column records.
Dim boolFound As Boolean
Dim i As Integer
Dim intLen As Integer
[Code].....
I am wanting to check two TextBoxes to see if they both have the same value. If they don't, then to show an ErrorProvider and do something with some buttons based on the input. I have all the textboxes in a List like so:
vb
Private MyList As New List(Of Elegant.Ui.TextBox)
vb
[code].....
I can go through the list to check if they have a value or not but want to check the last two in the list to see if they contain the same value. This is what I am doing to check to see if they are empty or not.
vb
Private Sub CheckMe() bIsEmpty = False For Each itm As Elegant.Ui.TextBox In MyList If itm.TextLength = 0 Then
[code].....
I am using a number of tables on my application and two of which have a foreign key constraint I have set between them. When I change the account number on the main table via a combo box all of the relevant information for that table on the form is updated accordingly. However, the child table which has a foreign key reference to the Account Number of the main table is not updated when the acocunt number is changed. I have set the update to cascade in the references but still am having issues.
View 5 RepliesI defined a database using SQL Server 2008 R2 Express, and connected to it using Visual Basic 2010 Express. For some reason though, when I use the database in the program, it wants to start off using a negative primary key.Is there any way to make the primary key only a positive number?
View 3 RepliesI have a database containing usernames and "points". I need to increment the "points" at will. I have the table connected to a sqldatasource.
Here is my current code:
With Users
.UpdateCommand = "UPDATE Users SET points = points + 1"
.Update()
End With
This works great, except, instead of just changing the entry with the username specified by a QueryString, it changes all of the entries and adds one.The sqldatasource has the following select command:
SelectCommand="SELECT * FROM [Users] WHERE ([username] = @username)"
This command makes it so that only entries with the querystring specified username are displayed. This is really my first attempt at SQL.
[code]....
I have a table with a multiple columns (two) primary key. I get an error on tableadapter.Update .How can I resolve that??
View 3 RepliesI have a sub that updates a form on certain occasions. Sometimes I need to update a form when some of the entries in my table will still have a NULL value. I used this code to prevent the sub from trying to fill the form fields with NULL data:
[Code]...
What is the best way to compare an Int entry from a table in a case statement?Using SQL server 2008 R2, Visual Basic Express with LINQ to SQL.The code I tried doesnt work:
Private Sub UpdateSetOpt()
Dim db = New ACEDataContext
Dim SRM = From q In db.Settings
[code]....
I made some progress and I am succesfully reading in reading in two columns of data to my DataGridView but now I am stuck. I have to search the first column for a particular number the read in that row and put the data in a variable to use, how do I search through this data?
Here is what I have so far:
vb
Private Sub RetrieveContacts()
Dim conn As New OleDbConnection("Provider=Microsoft.Jet.OleDb.4.0;Data Source=" & Application.StartupPath & "myTest.mdb")
Dim adapter As New OleDbDataAdapter("SELECT [PN], [SIZE] FROM MYTABLE", conn)
Dim dt As New DataTable("MYTABLE")
adapter.Fill(dt)
dgContacts.DataSource = dt
End Sub
I use in java JTable looks like a excell sheet create columns and rows and enter data in it.In vb 2008 what control i can use, I think table control layout not supported to data entry it supports control to in it and then add data .
View 1 Replieshow can i control Data Entry in 3 different table with BeginTranaction / Commit /Rollback in vb.net 2008. i am using sql server 2000 at back end and used SqlClient,SqlConnection, ExecNonQuery method.
View 1 Replies