Select 1 Random Records From Database?
Feb 15, 2012
I just want to select 1 random record from my database for example in my table1 i have a,b,c,d,e,f,g then everytime i click the button in my program it will output randomly between a to g then i can add another record from my database and if I make it a to x it will randomly choose between a to x, the random doesnt have any conditions.
Right now i've found some codes that will be very useful but i cant modify it so it will be connected to my database.
Public Class Form1 Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim DT1 As New DataTable
DT1.Columns.Add("SN1")
DT1.Columns.Add("NAME1")
[Code]...
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Jun 3, 2009
As in today i click on the button it will display the item when i hit again the button it will still display the same item and last for the whole. On the second day, i hit the button again it will display other items and last for thewhole day again.
[Code]...
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May 17, 2006
I can retrieve records from my Database fine, but I'm having trouble updating records. I am getting a syntax error on [code] I get this error when I change the Last Name (Row 0, Column 1). [code]
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Oct 27, 2009
how to get records into oracle database delete from db & update the records i have successfully connected my vb 2008 win form with oracle 10g.
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Jun 7, 2009
I have a form with a tic tac toe game on it. I have been trying to make it have a single player mode by allowing the computer to select one of the 9 buttons. However I can't even get it to select one of the buttons. Is there anyone out there that can help point me in the right direction.
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Feb 13, 2010
rying to make a program that will pull a word out from a text file and put it in a textbox
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Nov 18, 2011
I have problem and I've been looking for a week now on how to solve it. Yesterday I thought I solved but apparently I didn't when I tried the query with new data added in my database.Here's my query
Public Function getTicketsByBeginstation(ByVal station As String) As Array
Dim r As Array
r = (From u In treinDataContext.Tickets Where u.ritId =[code].....
The problem I have is: when I have a station selected there are more than 1 trajecten (connections in English) but I had to use the .first else Visual Studio would give the error "the '=' operator is not defined for 'integers' and 'system.linq. IQueryable(of integer)".
So I give the name of a station -> I have to select all trajectens with the given station as beginstation -> I have to select all ritten which have the given trajecten -> I have to select all tickets which have the given ritten So: I have to show all tickets for a certain station.
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Apr 20, 2010
I have a form with controls on it which are binded to a table, I have records selecters and so on... Just a simple display and edit form(yes I also want to be able to edit them so...) I created this form just by dragging items from the Data sources window.
Now I want to add a combobox which has a list of titles. And here comes the difficult part: When I select a title in the combobox, all the other controls show the matching info(matching to the title), in other words the datatable which is attached/binded to the controls must move to the right record. I have added a query to the combobox , which has two columns: ID and Title. the displaymember is Title and the Valuemember is ID. So I must look in the datatable for the right ID.
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May 7, 2012
I am also very new to visual basic, and need some simple advice from you guys. I basically have a button, text box and a .txt file.When the button is clicked, I need one of the entries in the .txt file (which are names) to be selected and displayed in the text box
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Dec 20, 2010
I'm working on a program that will randomly select a loadout(weapon, perks, etc), but the user enters their current level to get the loadout. This is important because certain guns unlock at certain levels, so i don't want someone getting something they can't use.
I'm not sure what the best way of approaching this is. All i can think of is either getting a random item, checking if the user's level is high enough then if it's not high enough do it again.
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May 23, 2011
I have 25 labels (Label1 - Label25). How can i randomly make the background of 1 label blue?I can set a random number in a variable, but I can't find out what to do next. It has to be something like this:[code]
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Jun 21, 2009
cmd = New SqlCommand("select * from employee_log where log_datetime >='" + DateTimePicker1.Value.Date + "' And log_datetime<= '" + DateTimePicker2.Value.Date + "'", cn)
Suppose if I select two dates june 21 and june 30 then records between 21 and 30 including 21 and 30 should be shown. But the records of june 30 is not shown..only from 21 to 29 is shown by this code. What should I add or edit to this code?
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Feb 1, 2011
Using Microsoft SQL Server I connect to tblTransactions. Within there is transDate. I have a from and to date selecter tool in vb.net. In my select statement how do set it to select only records greater than datefrom but less than dateto...?
I tried SELECT * from tblTransactions where date >- ...
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Apr 15, 2009
If I have say 5 numbers: 1, 29, 53, 95, 103 What would be the VB.net code for randomly selecting a number of those 5.
i.e) The random number has to be 1, 29, 53, 95, or 103 and has to be randomly generated.
I've tried using the Int(Rnd() * 104), but I do not know how to make it choose only these 5 numbers!
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Aug 30, 2011
i want to get a random directory from a specified directory, for example, the desktop.
im not sure how to do this, this and the only thing I'm having trouble with for my application
for example i have 5 different directories on the desktop called
Dir1
Dir2
Dir3, etc...
i would like to get Dir3, then maybe Dir1, after that maybe Dir3 again, and so on. i want to get a random directory from the desktop...dont really know how to explain it any better...
A specified a directory - a directory that i specify maybe in a text box for example. or a folder browser dialog
also i just want to get the path of the directory, i dont want to do anything to it.
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Jan 29, 2011
I want to select a random image from my resource folder and show the image in a picture box.
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Jan 10, 2012
I need to grab just one row, and output its name and details properties to a sidebox on my page.So far I have come up with this, which is not working and giving cast errors between the entity and the list of.
Public Shared Function GetOneRow() As String
Dim db As New Model.Entities
Dim rowCount As Integer = (From t In db.Table Select t).Count
[code]....
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Jan 20, 2009
I use this connection:
Dim connetionString As String
Dim cnn As SqlConnection
connetionString = "Data Source='" & txtHost.Text & "';Initial Catalog='" & txtDatabase.Text & "';User ID='" & txtUser.Text & "';Password='" & txtSenha.Text & "'"
cnn = New SqlConnection(connetionString)
cnn.Open()
cnn.Close()
How I read to SQL using "SELECT * FROM table ORDER BY rand()", select a random column and send the value "User" and "Password" of this column to Label1 and Label2.
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Dec 6, 2011
I want to select a random record from a data source (based on an MS Access file), and place the record cell contents into certain textboxes. After the record is chosen, it cannot be selected again.
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May 8, 2009
I was trying to at random select a listview item, I tried:
Dim random As New Random
Dim test As String = random.Next(0, formMain.ListViewSearchResults.Items.Count)
MessageBox.Show(test)
but this brings me back a "0".
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Mar 20, 2009
I've tried to do this
[Code]...
but it wont select. Btw, yes the list is full of strings lol.
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Mar 10, 2010
I'm trying to have this WebBrowser1.Document.GetElementById("box").SetAttribute("value", Random)" I want to have a random Text from selection like
[Code]...
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Apr 24, 2009
I have images stored in my resources that I want to call randomly to use as a background for an app. How do I call them randomly
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May 9, 2012
I basically have 1x text box and 1x button. I also have a text file set out as follows:
Fred Alston
Samuel Takahashi
Toni Tyree
Tonya Engel
[code]....
Except there are about 60 names.When the button is pressed, I want a name to be selected at random and placed into the text box.
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Jun 16, 2011
I have a search form that has the ability to return many records. I would like to have the results generated in such a way that a user can select one of the records.An example:
John Doe
Jane Doe
Mark Smith
If the user specifically wants to look at Jane Doe, then that record would be pulled and put into a new form. How can I make the records selectable especially when I don't know how many will be returned on the search.
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Jan 25, 2012
I've got a table that caches calculated values for certain dates. I want to use LINQ to select all rows where the calculated value fields are null.But when I use isNothing I get an error that LINQ can't translate this into T-SQL. Is there a way to select null values with link, like this...?
Dim var = From rec As Record In myDataContext.Records Where IsNothing(rec.calculatedValue) Select rec
Other posts on stackoverflow mostly discuss how to avoid or check for null values with LINQ.
Note: I can't just set cacluatedValue's default to -1 to flag records whose calculated value has not been set (and then select those records) because I run queries that sum/average the calculated values. Selecting nulls seems cleaner and less bug-prone.
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Mar 11, 2010
I need to select multiple random rows in DatagridView with keypress.Ex:
Row1 -selected
Row2 -not selected
Row3 - selected
I do have part of code that will update certain field in database on keypress, but i have no idea how to create multiple selection and display it on DataGrid.CTRL+Click is nice, but I would like to have option of selecting rows with keypress.In following code I am checking if certain field is marked for selection(i want to give user an option to start selection, exit program then continue selection later) but it allways select all rows in table (even if only one is marked).
Dim NumRow As Integer
NumRow = 0
Do Until NumRow = dbtShow.RowCount - 1
[code]....
My question is: What is the best way to select multiple random rows in code?
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Jun 6, 2012
I have a picture box which reads in an image from a folder to display, instead of having the usual boring image I thought it may be nice to have a number of images in the folder and let my vb.net program randomly pick one out to use.
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Jan 15, 2012
Im making a text based game that i need to randomly select different numbers of lines from a text file then pass them to a list box.[code]...
First the code needes to identify the 4th element then randomly select lines from lines that contain that element. The code needs to work out how many lines have a matching text to the 4th array then randomly select lines from that total no need for a maximum limit to that number.The same line must only been show the once at a time, but It can then be shown again on a different button click.[code]...
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Jan 18, 2009
It's possible to select random a column in SQL 2005 using SqlConnection? And this column to send "UserID" e " ChName" for Label1.Text and Label2.Text?
example: after choosing random the column, send "UserID" and "ChName" to Label1.Text and Label2.Text.
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