I want to search record in the database and if the record all ready in the database something do. I use this code but it is not work
Str SQL = "SELECT* FROM student WHERE stdno = '"& txtstdno.Text &"'"
oledbcon.open()
ry
[code].....
Having problem in updating an existing record. An error occurs "Data Type Mismatch in Criteria Expression"
Private Sub ToolStripButton1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ToolStripButton1.Click
Dim myBuilder As OleDb.OleDbCommandBuilder = New OleDb.OleDbCommandBuilder(dataAdapter)
[code].....
I have a binary file that I need to seek to certain record numbers. This is the code that i have been using to search an ASCII file. My problem is I don't know how to read specific binary "fields" in this new binary file. The 2 fields I need are a Long and an Int 64 field.
Dim MyFile As New FileInfo(File) Dim fs As New FileStream(File, FileMode.Open, FileAccess.ReadWrite)
For x = 0 To RecLength - 1
fs.Seek(ConvertRecNumToByte + x, SeekOrigin.Begin)
RecHold = RecHold & Convert.ToChar(fs.ReadByte())
Next
frmAddUser is a simple form that is opened as a dialog by a command button on the primary form (frmPrimary). Once opened, it's only job is to collect information via textbox and combobox fields. Once submitted, the information is added to the database.
This works, or so I thought. If I open this form, fill it out, and submit the information; the record is created. However, if I turn around and do it all again with different information, another record is created but with the previous information (not the new). It will continue to make records as long as I keep submitted this form but no matter what information I put in, it always uses the original information that was used to create the first record.[code]...
i was wondering is there a build in class in vb.net for get a range of dates from a column:What i mean is say i had the following dates in a column
10/03/2012
11/01/2011
14/05/2011
[code].....
i've been trying to figure out how to update a row in my database, using a set of fields from the current form. The code which i have made so far is shown below, however it always comes up with an error message:
Private Sub btnupdate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnupdate.Click
Dim SQL As String
Dim updatelogin As New OleDbCommand
Try
[Code]...
I have built a search criteria for a table in my database. I have 3 textboxes first says anstnr second says firstname and the third lastname.The problem is that i cannot search if first field "anstnr" is blank. If i only will search on firstname thats not working.
Private Sub FillByolikaToolStripButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles FillByolikaToolStripButton.Click
Try
[code].....
how to seek a record in access (.accdb) file and update.
i have posted a question in below thread how to work with (i mean connect to a access database)....
[URL]
I could able to navigate through records but, i want to seek a particular record and update accordingly.....
when i used find method i am getting an error as below
"Table doesn't have a primary key."
But my database has a primary key.
thr are 02 fields username,pasword in database also two textboxes in vb.net form for username and pasword ... i need coding of if else which confirms that, if (username,pasword ) = username,pasword of atabase then
View 7 RepliesHow we can show data from acess database in datagrid
View 1 RepliesI've already finished the program and the last task was to add a password for my MS Access database. I've created the password in Ms Access and I've already modified the connection and saved the password but when I run the program all codes like this
Me.Table1TableAdapter.Fill(Me.Database1DataSet.Table1)got an error message says Not a valid password.
I am trying to check a record in database before inerting a new record here is my code but problem is when i enter a names first alphabet it imediatly populate massage. i want to check it after entering whole name
Private Sub TextBox1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox1.KeyPress
Try
Dim cnString As String = "Provider=Microsoft.Jet.OLEDB.4.0; Data Source=" &
[CODE]...
I have a problem with my program, and it's really bad because I need to burn it to disk within 12 hours and I can't get it to work: If I create a record, add information to it and click on Next Record, the ID, Status and Notes boxes content will change but the rest of the controls contents are carried over to the next record and I don't know why or how. It was working perfectly but now it stopped and I never done anything.
View 8 Repliesi was modified some my data. then i use this code:
[Code]...
When using the codeTryMe.Validate()Me.CustomersBindingSource.EndEdit()Me.CustomersTableAdapter.Update(Me.NorthwindDataSet.Customers)MsgBox("Update successful")Catch ex As Exception MsgBox("Update failed")End Try in the walkthrough given in http://msdn2.microsoft.com/en-us/library/0f92s97z.aspx, changes were not saved to the NORTHWND.MDF file in the project folder or bin folder (not updated).
View 1 Repliesi have this solution that i'm suppose to make an installer of, but because it calls a datebase and the database is not within the solution therefore it was not included in the installer.
and my installer cant work correctly. is there anyway i can go around doing it?
I have records in a database. Each record has a Picture path in it eg. "C:\Pics\Image1.jpg". I would like to display a record from my database and also the picture for that record, in a .rdlc report in vb .net 2008. i have succeded in displaying the record but just can't get the picture to show. I am using an Imagebox in the report.
View 2 Replies-in my database..there are 2 tables..
1)Leave_application
2)Staff
-how do i type the code to minus out the number from "Leave_balance" (in the Staff table) with the number from "Days_apply" (in Leave_application table)
[Code]...
I have a access database with these columns. USER_ID,COUNT,TIMES
Let say the current record is this:
USER_ID,COUNT,TIMES
STEVE20,24,1.5
Now I want to updated the current count record and times, but before updating I want the old record to be added to the new record. What should be my query?
i have encountered this error Variable 'dsNewRow' is used before it has been assigned a value. A null reference exception could result at runtime when i click on the button to insert data into my ms access database.
[Code]...
How can inserting picture to picture box from sql server database to vb.net2005 program at run time?
View 1 Replieshow to view the next record and previous record in the database.? just like in the picture below.? what condition should we use.?
View 8 RepliesI am reading data from a file there is a part in the file were I want to just seek to the end of the file and stop reading but cannot seem to get seek working. Only thing that seems to work is ReadToEnd, any ideas.
here the code I use to read data,
vbnet
Dim sr As New StreamReader("C:outDoom.txt")
While sr.Peek <> -1
[code]....
I am trying to read in a file and store the byte position of each line read so that I can write out to another file the records in any order that I want. I am doing more manipulation of the lines, hence why I need the line position from the original file, but for simplicity sake, I am just including code to display the problem I am encountering. When I read in the file, I am getting the correct file position, but when I write out the lines, every 1024 characters it is re-writing whatever current line it is on. I am assume there is some buffer that is coming into play that I am not familiar with,
[Code]...
I'm trying to seek to another position within a streamReader file, but the position won't change.
region_streamReader =
file.OpenText(
WORLD_REGIONS_FILEPATH )
region_line = region_streamReader.readLine()
[Code]...
I'm trying to write a code in visual basic to perform the Excel version of Goal Seek in Access, When I wrote the code, wich included the formula below to do the goalseek function, it gives me an error and identifies the"Range" in the "ChangingCell" segment of the formula as a problem.I am using two text boxes (Text210 and Text495); one that contains the data and the other box for the results.[code]
View 2 RepliesHow can I get the key of a dictionary by passing the index value? I'm trying: If rs.Fields("NM").Value = dictNM.key(0) that is, I want it to compare to the first key in the dictionary but I get the error Compile error: Invalid use of property I tried googling, but to no avail. I'm hoping this is even possible.
View 1 RepliesI want to make a program that can play MP3-files from my FTP-server.I know how to play, pause and stop music from stream, but i don't know how to add seek-ability.You know, like in Spotify or Grooveshark, they play streamed audio with seek.so, i would like to be able to seek, and the trackbar would show where in the song you currently are.So, my questions are:
1.What codec should i use? I have NAudio, will that work?
2.Is there any examples or tutorials on how to do this, any at all? (i couldn't find any)
I need to get the ID number from an acces table (I am working with GIS .. I do not nkow if that helps) from a record (I do not know if I am using the correct technical words here)
View 4 RepliesIn VB3, I could open an Access file, select the table, specify the index and read a record in just that many lines. [code] If the customer's phone number was stored in Access as Phone, once the seek command was implemented, it was available as HeaderTb(Phone)In this example, OE was short for Order Entry, and the database contained the header files for all orders.I worked through the oft-cited tutorial to pick up the basics for database control, but it provides a means for the user to look over and work with records.But what if my application was more of a relational database? How do I instruct VB10 to access a record by its key and how do I use the data it comes back with?
View 9 Replies