Access Text File From Web With .Net?
Jan 16, 2010I'm trying to load a text file with VB .Net so that I can use it with a streamreader object. for example:[URL].. It is of a particular URL and is already present on the server
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File I/O And Registry :: Random Access File Larger Than Text File?
Jan 7, 2009I am writing a program to calculate Pi to several hundred billion decimal places and this will require lots of GB of memory. I wrote a test program in VB2008 that saved the first 16 digits of Pi (without the decimal point) to both a text file and a random access file, just to be sure it was outputting the numbers properly. For reference the first 16 digits of Pi are:
View 8 RepliesConverting Delimited Text File To Access File?
Jul 29, 2009I've got a problem in Importing Text delimited File to access Db , I always get an error "No value given for one or more required parameters' while execution [Select Into] Statement
[LEFT]
Dim svdialog As New SaveFileDialog
svdialog.Filter = "Access Database Files (*.mdb)|*.mdb"
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Exporting From Access To Text File?
Apr 29, 2010this is my problem: i've some data in an access database, i collect this data from the table and when i try to record the data in the text file, with the fields separated with a "!",the registration fails, better, doesn't register all the datas that are in the table.This is the
Dim tw As TextWriter = File.AppendText(Application.StartupPath & "DStampa.csv")
Dim objDataTable As DataTable
Dim TotaleDatiStampa As String = ""
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Random Access Text File?
Apr 25, 2010I'm doing a Program for a Friend of mine, He Want to have a Console Program Running on his Computer.OK the problem i am having is With Stream Read, I have 3 test users inside Test File, if User 1 logs in his information is store in logged file with time and data.but if User 3 logs on user 1 2 and 3 are all saved on the logged file
i dont have read to end of file in my Code.i dont have my Program with me, so i going off the top of my head i have something like this what i want to be able to find out how to do is Right from any part of the file and out put it, I take it i need to use Random Access but how to i code Random Access for this type of file. All i can find is how to Randomly place Words in a text file with Length and size.
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Assistance With Migrating Text File To Access
Mar 5, 2009I created a program that logs incoming data to a serial device to a text file but the output is not what i really want, the data appends to the text file and looks like:
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Error When Trying To Convert Text File To Access
Dec 3, 2011I am trying to insert data from a text file into an Access table. However, when I try to execute the command, I keep getting the following exception:A first chance exception of type 'System.Data.OleDb.OleDbException' occurred in System.Data.dll.And my Catch block throws me the "Unable to read file" error that I placed.[code]
View 4 RepliesExport Access Table Into Text File?
Jan 10, 2012I have written the following code to export an MS access table into a text file.
Dim conn As New OleDb.OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:Test est.mdb")
Dim cmd As OleDbCommand
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Importing A Text File Into Access Database?
Nov 12, 2010I am using the following code to try and import a txt file into an Access database however it is not working, at all. The txt file has approximately 10 columns in it but when this has finished I get 1 column with no Data.
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Importing Text Delimited File To Access Db?
Jul 29, 2009I've got a problem in Importing Text delimited File to access Db , I always get an error "No value given for one or more required parameters'while execution [Select Into] Statement
[LEFT] Dim svdialog As New SaveFileDialog svdialog.Filter = "Access Database Files (*.mdb)/*.mdb" If svdialog.ShowDialog = Windows.Forms.DialogResult.Cancel Then Exit Function
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Save Access Table To Text File?
Jun 15, 2009i have a comma delimitted text file that i need to add three fields and update the contents of those three fields and then save the text file.
right now i bring the file into ms access and alter the table to add the fields and then update them but i don't know how to export the access table back into a comma delimitted text file.
Trying To Connect Field From Text File To Access DB
Mar 23, 2011I am working on a project for work where I am stuck. We have a daily checklist that i have converted into a Tabular text file. In the text file I have 3 pieces of information, DB field reference, Time it should be done by, and task to be completed. I have this part being pulled into the screen with the Code below. My problem is how do I Merge the Database to the TextBox. The Access DB has 50 Columns of for data Labeled 1 through 50 + one date Field
Imports System.IO
Public Class FirstShiftCheckListForm
Dim strlines() As String
Dim strline() As String
Dim strarray(,) As String
[Code] ......
.net - Exclusive Access To Text File, To Read And Overwrite It?
Oct 20, 2010I'd like to open a text file and not allow any other processes to write to it. I understand I can do this with the following FileStream:Dim fs As New FileStream(_FilePath, FileMode.Open, FileAccess.ReadWrite, FileShare.Read)
Once I have access like this I need to read all of the lines (I will use a StreamReader(fs)) and then I will need to write to the file (I will use a StreamWriter(fs)).
The problem here is that the StreamWriter won't allow me to set the append mode to false (so I can overwrite all text in the file) when I use the filestream as a parameter instead of the file path. So all text written with the StreamWriter is appended onto the text which I don't want. If I use a StreamWriter with the file path (which will let me set append to false) as the parameter instead of the filestream it will be locked out because of the FileStream FileShare. How can I still have exclusive access to read and write to the file but still be able to overwrite the existing text (append mode false)?
Application Slow Is DB Access/text File Code Ok?
Jan 26, 2012I noticed that my application is running a bit slow. This is a Windows Service built using VB2010 with SQL Server as a back end. Its main function is to poll a folder looking for a text file. If found it reads the text file and imports the data into SQL Server.
While the slowness could be caused by a number of reasons, I am looking at my code to determine if it could be more efficient. Below I've pasted snippets of code where I initialize the DB connection and execute SQL statements. I've also included a snippet that illustrates how I am processing the text file.
I'd appreciate if the group could have a look at these and let me know if the method that I am using is the most efficient possible. At this time I am also focusing on other probable issues, but I can't rule out the possibility that the code that is in place might be a contributing factor.
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DB/Reporting :: Import From Text File To Database (access)
Nov 10, 2009I am trying to import a text file to an access database in VB2008 express. The text file I am testing with is a csv file with 34,000 records. The problem is this takes 2 minutes to read through all this and write it to the database. The actual text file I will be using in production has over 800,000 records and this will take a ridiculous amount of time. I think I am doing something wrong. I have posted my code below. I am reading a record, parsing out the fields to an array, then creating an SQL statement to insert the record and executing it.
reader = New IO.StreamReader(fname)
Do While reader.Peek() >= 0
linesread = linesread + 1
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Export Microsoft Access Database To Text File?
Aug 7, 2009I'm using Visual Basic Express 2008 (VB.NEt). I've created a project which
connect to a Microsoft Access Database (OLEDB) & displays the records using textboxes in the windows app.
I need to add a button which exports the database to a fixed length text file. Does anyone know the code I would use to do this?
Import Csv Text File Into Existing Access Table
Aug 18, 2011I'm using the following code to import data from a text file into an existing Access table:
Code:
Imports System.Data.OleDb
Public Class Carrega_CSV
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
[Code]....
The first time i ran the code, it caused no error but no records where loaded into the table. The second time it causes the OleDbException "Table 'TEMP' already exists." The text file is comma delimited and it has exactly the same number of columns of the TEMP table.
Import Records From A Text File (not Delimited) In Access Db?
Nov 11, 2011I am just trying figure out a record import program from text file into access database using Microsoft.Jet.Oledb Provider 4.0 and Vb.net. And it seems easy but my problem is different. In the text file, records are not delimited.
Format of the text file:
Field Name & Size
Date[Date,ShortDate]FirstName[20]LastName[20]Sex[1]Age[2]
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Can I put delimiter programmatically while reading the text file using stream reader and later simply import the whole file in DB.
Import Tab Delimited Text File Into Access Table?
Feb 15, 2008I am trying to import tab delimited text file to access table. The below code WORKS very well for csv file. when I try the same for tab delimited text it it importing all the fields into one column of the access table and combining the header files as one column.
View 8 RepliesLoad A Fixed Length Text File Into Ms Access?
Jan 6, 2010what do you think would be the best way to load a fixed length text file into ms access? this is how i would normally do it if it was comma delimitted:
sql.CommandText = "SELECT * INTO [tblMailList] FROM [Text;DATABASE=" & FilePath & ";HDR=NO].[" & FileName & "]"
sql.ExecuteNonQuery()
Reading Multiple Text File And Update In Access?
May 30, 2009I am trying to select Multiple files and then read the file 1 by 1, i want to know how to specify the file number in Visual Basic .net 2008
Here is a sample code which i have used in reading the text file.
With dlgOpen
.Filter = "txt Files (*.txt)|*.txt"
.Title = "Open Text Files"
[Code]....
Actually my text file is a dump file and i need to make a program to process this dump file. I may ask some stupid questions but this is just a beginning, i want to parse INDIVIDUAL text file line by line. In the above code i have used the ReadToEnd function in order to display it in TextBox but i may use ReadLine Function or Read function to read line by line or characters respectively.
I have attached an Access Database with the predefined tables in it, I want to update the contents in Access Database. Supposingly if my textfile contains Names (Sam,Julie,Joseph,Marina), how will i update my attached Access table in vertical order !
Split The Text And Import File To An Access Database?
Nov 10, 2011I am a school student and having a project on importing text to access database. The problem seems easy but the issue is the text file i am trying to import has no delimiter. .
firstnamelastnamesexage
jhonlittlem15
Now how can I split the text and import it to an access database.
VS 2008 - Importing Text File Into Database Using Access?
Apr 19, 2011I have a large text file that I want to use in my project, that data in the text file has about six items for each location. Now I had thought of importing the text file into a database using Access, but not had a lot of luck making it work. The question is is it better to load the data in the project as a text file then search for the string required or to convert it into a database. (The text file is a list of airports and related data.) Can a text file be converted to a Microsoft compact SQL database?
View 7 RepliesChange The Delimiter When Writing Access Table To A Text File?
Nov 2, 2010How can I change the delimiter when writing my Access table to a text file? I was hoping it would be as easy as adding a similar option like we do for HDR=No; maybe Delimiter=|
Dim AccessConn As New System.Data.OleDb.OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=|DataDirectory|mydatabase.mdb")
AccessConn.Open()Dim AccessCommand As New System.Data.OleDb.OleDbCommand("SELECT * INTO[Text;HDR=No;DATABASE=" & userPath & "].[" & fileName & "] FROM tblMyTable", AccessConn)
AccessCommand.ExecuteNonQuery()
AccessConn.Close()
VS 2008 - Random Access Reading Of A Non-Standard Text File
Jan 12, 2010how to proceed. One of our customers is going to be sending me a flat file (ASCII-Text) that I have to break down and scan. Every line ends in a CrLf - So I know I can use StreamReader and ReadLine(). I did get it to work on one of the test files they sent.(A very Short file) However, the file is not delimited at all and every field is padded to the full length they specified. Here's the format of the file:
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Windows7: Writing A Text File Giving Access Denied?
Nov 28, 2010I've been doing some more experiments and have summarized the query as below: I've created the simplest application. A project with a plain form, which writes text file within its application directory. Simple as that.Supposing this was my application which I want to distribute on the world web. I've created a basic installer for this using NSIS installer. The Installer installs my application in a folder created inside Program Files. The OS is Windows7 and UAC is enabled.Now I know many people have been facing difficulties in accessing files inside the Program Files folder. My app is simply creating a plain text file, nothing more, and within its own application directory. It is giving Access Denied error. But if I right-click on the EXE and run it as Administrator, then it works ok.The only solution thats available is not to write in the application folder, and write text file in some other folder which is not protected. My question is that other programs that are installed on my system are also doing it. I have a temperature monitoring software called SpeedFan on my system, it creates log files within its app directory. All other softwares create log files within their app directories, why cant I?I just have to make a small log file for my application and Win7+UAC is not letting me do it. I don't want to write the small file in any other folder. How are the other softwares accomplishing this ?
View 5 RepliesGetting Data From Delimited Text File Into Access Database In VB6 And It Is Running Perfectly?
Jun 4, 2012I used this code for getting data from delimited text file into access database in VB6 and it is running Perfectly Same thing i want in VB.NET using OLEDB. So can anyone suggest me what code should i use..?
Other info:
Database = mydatabase.mdb
Table Name = SUBSCRIBER
4 Columns = NAME,AGE,GENDER,ID
Text File = temp.txt
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TIP 1: Index Lines In Large Text File For Fast Random Access?
Jul 14, 2011When you need to do random access to the lines of a text file, the regular solution is to put those lines in a list and access them in that list.But doing this if the text file is large creates a large memory overhead and may cause some memory stress on the application.This class maps the file and provide the ability to read any particular line in the file at a random position, without the need to read or put in memory any other line but the desired line. The only memory overhead involve is the 1024 bytes buffer of the base stream.Even if the file mapping can be a process that consume a noticable amount of time if the file is very large ( ~ 5 seconds for each 100,000,000 caracteres) , once the mapping is done the access to a particular line becomes instantaneous regardless of the size of the file. (The file mapping can always be done at a convenient time (ex when the process load) and can be done on a worker thread The class is base on a StreamReader to support the differents Text Encodings Example uf usage ( As I say, if the file is very large, dont do it like that, but declare the class at a convenient time)
Imports Reader = System.IO.MyStreams
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
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VS 2008 - Read Text File - When Click Button Add Text From Combobox Is Added To Text File
Jan 4, 2010I have one combobox, two buttons (Add and View) and listbox. When I click button Add text from combobox is added to text file. This is code for Add button:
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Looping Through A Text File Using StreamReader Causes A "Cannot Access A Disposed Object."
Feb 15, 2012I have the following basic code to read a text file from a StreamReader:
Using sr As New StreamReader(FileData)
Dim line As String = String.Empty
Do
'Error occurs on the next line after looping
'past the *last* line in the file...sometimes
line = sr.ReadLine()
'Some code here to parse and process the line
Loop Until (line Is Nothing) OrElse (line = String.Empty)
End Using
I tried changing the Do Loop to Do While Not sr.EndOfStream I tried checking If sr.ReadLine IsNot Nothing and a few other things but I keep getting the Cannot access a disposed object. Object name: 'SslStream' error after all 105 lines have successfully been read and processed. This code has been working for a couple of years, but there seems to be some issue with certain files (recently) that is causing this problem.
I opened the file and I didn't see anything out of the ordinary. No extra blank lines, funny characters or anything of the like. Just a normal file with 105 properly formatted lines. So even know there is something about this file causing the error, I need to obviosly handle this programatically.
What can I do to prevent the sr.ReadLine() line of code from throwing that exception that I have not yet tried?UPDATE Upon reading the last line of the file, the 'EndOfStream' property on the StreamReader goes immdeatly to: EndOfStream: {"Cannot access a disposed object.Object name: 'SslStream'."} It never toggles to 'True'. This makes checking for this condition problematic.
I think I have figured out why this issue only occurs sometimes: if I add in a blank line to the file at the end, none of this ever occurs. It is only when the last line of the file contains data. Still, I should be able to handle this programatically. Telling the vendor supplying the file to always add a blank line at the end should not be the solution.