I am reading data from the database with SQLCommand object SQLReader, all I want to know is I want to read a specific row from my column myData...e.g.I want to read row 11 or random row from mycolumn, what is the correct syntax I am reading all the data(rows) from mycolumn with the command
"SELECT mycolumn from Table1"
what is the syntax to read the 11 or any row of this column?
I have a property active to indicate status of an employee. Along with all the details, i extract the details from an employee table into a dataset, but however i am not able to get the value present in active as i get an invalid cast exception.
This is the property declaration.
CODE:
Reading bit type sql server db column from dataset
View 3 RepliesI've been writing a weight program for flooded pressure vessels and I'm having trouble retrieving the data from the text files I've been saving. I know how to write the data to the text file, but retrieving it with OpenFileDialog is not so easy for me.The user has individual text boxes that they input strings or numbers into and when they save the file, each text box input is written to one line in the text file. For example, the first text box is for the username, therefore the first line of text that is saved is the person's name, the second text box is the customer, thus the second line in the text file is the customer name, and so on.
(Actually, the first line of text in the saved file designates whether English units were used or Metric units because when the user retrieves the saved file, English units will open one form and Metric units will open a separate form, so some If...Then statement will need to occur).I need to be able to read the first line, have either my "EnglishForm"form open or my "MetricForm" form open, and then have each subsequent line of text be displayed in their corresponding text boxes. I know I need to use ReadLine or LineInput, but I don't have a clue what to do.Assuming the syntax I've displayed below would just magically work (if only life were that easy), it would look something like this
If FirstLineOfTextInFile = "English" Then
EnglishForm.Show()
ElseIf FirstLineOfTextInFile = "Metric" Then[code]....
And so on...I read a lot of articles from the MSDN library and exhausted each link that I've looked through from Google and Bing, but most only retrieve data from the file to a single text box through some loop or streamreader and don't take into account multiple forms.
in my program i have a list box full of rooms and when that rooms selected all its details are to be shown in a bunch of different labels. Problem is, no matter which room is selected the data readers only reading from the very first row in the database. I've got a variable to hold the name of wich rooms selected, but how would i use that variable to determine where the rest of the data should be read from.
heres the code that im using
Private Sub lbRoomLoc_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles lbRoomLoc.SelectedIndexChanged
[code]....
I am trying to read some data from an Excel 8.0 worksheet using OLEDB thusly:(Warning - contains curly braces)
Code:
DbProviderFactory factory = DbProviderFactories.GetFactory("System.Data.OleDb");
using (DbConnection connection = factory.CreateConnection())
{
[code]....
The problem is that for some columns it sets the data type to be Double even though the spreadsheet column format is "Text" and teh column contains non-numeric data. Then when it gets to that cell it returns DBNull instead of the text value.
I have been learning VB for about 3 months now at college and decided to enhance my skills by making my own project at home. My project is basically a game where you have to guess if the next number will be higher or lower than the previous version and you can place bets on it. I have done all of this ok but I wanted to create a high score system so that you could save your score.I can manage to write out to a text file ok so that it looks like this
Highscores
Name
Score
[code]....
etc. But I am not sure on how to read in a specific line. So for example I want lblHighscore1.text to equal line 3 of the text document (as vb counts the first line as 0) So far all I have is this;
Dim objReader As IO.StreamReader = New IO.StreamReader("C:UsersKarlDesktopHighScore.t xt")
lblHighscore1.Text = (objReader.ReadLine)
here's the scenario. There's 2 types of employees; Worker and Manager. The worker will have to access the page 'worker.aspx' and the Manager will have to access the page 'manager.aspx'. In my login database (Access 2007) I have the first name, last name, username, password and job title of both workers and managers. Ex:
[Code]...
I have a test.txt file that contains:
1/15/2011; somedescription ; Joe Blow ; $50
1/18/2011; somedescription ; John Doe ; $30
2/1/2011; somedescription; Joe Blow; $90
I want to be able to pull all rows of data associated with Joe Blow if a users selects Joe Blow from a combobox. In testing this out I added the code to a button
I'm trying to create a program that stores a users stats for their character (for something like an RPG). I know how to write more than one line in a text file, but I want to learn how to read and write text on specific lines of my file. I know that you can just read each new line individually in order using a StreamReader, such as
username.text = readLine.ReadLine()
userage.text = readline.ReadLine()
[Code]....
This is good for just displaying the stats and changing them from a constant interface, but I'm afraid that eventually I'll need to read/write specific lines, like reading the fourth line which might specify magic level, or writing a new money amount.
I am currently writing a Login Script, and I am having trouble making StreamReader read a specific line in a text file. This is what I have so far (not the entire script, just the reader lines):
Dim path As String = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData)
Dim file As String = (path + "LogDat.txt")
Dim sr As New IO.StreamReader(file)
Dim line1 As String = sr.ReadLine(1) '' Supposed to read line 1
Dim line4 As String = sr.ReadLine(4) '' Supposed to read line 4
Dim line9 As String = sr.ReadLine(9) '' Supposed to read line 9
I would like to bind different queries for a long set of columns in datagridview that has been set already during the formload, e.g:
With dgvGrid
.Columns(0).Name = "Dept Code"
.Columns(1).Name = "Emp ID"[code]....
there are still more of it. The data needed for those columns is coming from a different table.
I have a text file like this:
4.5 28 Red (T1 ) [1 12.86 53.8] 229111 -28275 198452 -1309 | 11.0 28 Red (2 13.10 04.0) [T1 ] 130611 2948 229111 28275
I want to chage the value in green colour and red colour column in each line. how can i point to that column?
how to read a text file that is column aligned. I understand how to read a delimited file (i.e.: comma, pipe, space, etc.) but the file I need to read is column aligned. [Code]
View 6 RepliesI have a gridview loaded with data from my database and a gridview swapping function which after exchanging data between rows with a column call "Priority", I want to save these changes back to my database. Only the "Priority" column value will be change, how do I update only that Column of my dataset table to my SQL database?
[Code]....
I have an SQL database, and 50 text files, and Visual Basic 2010 Premimum,I need to find a specific line of text in the text files and then take the next 37 lines of text and save them in my database. I need advice as to point me in the right direction
View 2 RepliesI need to go through the column headers and look for specific text to locate & verify which column contains the data I want.
View 5 RepliesI have a text box labled QTY, which feeds the QTY column on a datatable. the table then is ran through a function that takes the data and converts it to a string which my production machine can read. My problem is this, and its probably really simple (these problems usually are) how to i force the user to use a specific type of input on the txtbox so they would have to put the QTY in the format of 01 02 03 etc etc, i have it set to default to 00 but i want to force the user to haver to input 2 chars.
View 5 RepliesHow can I get information what data type a certain column is. (Integer, string, memo,...)
View 1 RepliesI am trying to open a text delimited database using the jet.OLEDB.4.0 driver. My connection string is as shown here:
Dim sConnectionString As String = "Provider=Microsoft.Jet.OLEDB.4.0;
Data Source=" & dataDir & ";
Extended Properties=""text;FMT=Delimited( )"";"
I have read that you either need to alter the registry, or to add a schema.ini file containing information about the delimiter in order to recognize the delimiter. My question is if there is any way to do this without altering the registry or adding a schema.ini file, as both of these are unfortunately not an option. The only solution I currently see is to split each row, is this the only way out.
i have maid a simple login system in vb.net here is my current code
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
If TextBox1.Text = "http://mywebsite.com/usernames.txt" Then
Form2.Show()
Me.Hide()
[code]....
I have a program and I get time data from a sqldb and display it in a column in a listbox. What are the proper steps for adding the time as I iterate through the data in the column? I figure I will need to do some conversions on the time to be able to add it and display it as a total.
View 9 RepliesStrange story... I downloaded VMWare but it has since advised of an available update. I downloaded the update and when I click to install it, a window comes up with VB Code from a project I created a while back in a completely separate folder from this install file. I then tried downloading the trial of VMWare Workstation and when running the installer it shows the same thing. I don't know of anyway to contact VMWare support since I don't pay for any services or products and all there is available is a FAQ type section. Of course this problem would not be in there, nor can I find any such related issue online. his is VMWare specific or perhaps the type of install specific. I have no other issues with any other app installations other than with VMWare installations.
View 2 RepliesI am using VS 2010 and I want to read the Text File values and place them into variables. This is my code
Me.OpenFileDialog1.FileName = Nothing
If Me.OpenFileDialog1.ShowDialog = System.Windows.Forms.DialogResult.OK Then
Me.TextBox2.Text = Me.OpenFileDialog1.FileName
filename = Me.TextBox2.Text
End If
[Code] .....
I am unable to move pointer to next line.
I have two text files, the first text file has two columns separated by a space (" ") and the second text file only has one column.
The column 1 in text file 1 and text file 2 match albeit in different order, what I'm trying to achieve is for every field in column 1 text file 2 I want to search for column 1 in text file 1 and display the matching column 2 field in column 2 text file 2.
Dim*OpenTextFile*As*String*= IO.Path.Combine("C:Test1.txt")
Dim*OpenTextFile2*As*String*= IO.Path.Combine("C:Test2.txt")
Dim*SaveTextFile*As*String*= IO.Path.Combine("C:Test2.txt")
[code]....
I want to search my access database and count the number of records in the column "Type" in each group. For example
[Code]....
switching our database over to UTF-8 (multi-byte char, unicode) encoding from IBM819 (single-byte char, Latin1 subset), because of a new requirement to support text entry of Czech characters.I've just been reminded by a colleague of the nchar and nvarchar column types, which neither of us has actually ever used.
If I were to define the relevant columns as nchar and nvarchar instead of char and varchar, what would I have to do to allow my currently-IBM819 database to work with this new IBM819-incompatible text coming in from my .net application?Would all conversion be automatic? Would I need to write some scary conversion code?
EDIT: Right, I defined an "nchartest" table containing a single column, "ntest" of type nchar(500).I connected to that via .net code and confirmed that 500 chars of lorem ipsum could be entered:
Dim insertString As String = "INSERT INTO nchartest VALUES (?)"
Dim insertCommand As New IfxCommand(insertString, cConnection, tTransaction)
insertCommand.Parameters.Add("incident_recno", IfxType.NChar).Value = "[lipsum]"
Return insertCommand.ExecuteNonQuery
I then replaced the lipsum string with 100 or so chars of Czech text, and attempting to insert that caused an IfxException to be thrown by the .net Informix interface, with the message ERROR [HY000] [Informix .NET provider]Unspecified System Error = -21005.
Following up on some research I did yesterday, I tried setting my CLIENT_LOCALE setting in my connection string to en_US to match that reported by Threading.Thread.CurrentThread.CurrentUICulture, but that connection could not be opened due to ERROR [HY000] [Informix .NET provider][Informix]Unable to load locale categories.
Following that, I tried setting CLIENT_LOCALE=en_US.unicode, which produced an ERROR [HY000] [Informix .NET provider][Informix]Unspecified System Error = -31142.
Those who are looking for an example like this, might find it useful (or not). I know i was looking for one like this for over a week. Ok now, to make this codes work properly, you have to make a Database in Ms Access (I used MS Access 2007) . Create a table of two Columns, one name Debit and one name Credit. Both of the Columns Data Types must be Long Integers or you might get some conversion errors at run time. Now save the database in Access 2000-2003 Database format. And last of all, put the database in your projects DebugBin directory to avoid the database Connection Errors.
[Code]....
This is my programs complete code, the only problem is i want to fix the amount of decimal places that show up in my gridview. The problem is if i do this on the asp side the location of the column gets thrown off and the column is duplicated. I figured if i just remade the table on the asp side it would work only problem is if i remove the sql for that particular column the asp side column cannot get data.
Imports System.Data.Sql
Imports System.Data.SqlClient
Imports System.Data
[Code]....
I am trying to alter a column in an Access database in VB2008 from date to text format using the SQL string as follows "ALTER TABLE receipts ALTER COLUMN Date CHAR(10)"but whether I Use TEXT, CHAR, VARCHAR or STRING, I get a Syntax Error when I run ExecuteNonQuery.
View 2 Replies