Skipping Or Backing Up Records In Database Within ExecuteReader Routine?
May 23, 2010
is it possible to skip forward or backup to the previous record in a database within a Do Loop of an ExecuteReader routine? For example, with the following code:
DMDatabase01.Open()
DMCommand01 = New OleDbCommand("Select * From DB01Table01 Order By DB01F01, DB01F02", DMDatabase01)
DMReader01 = DMCommand01.ExecuteReader()
Do While DMReader01.Read = True
[Code]...
I have the need as part of a larger data comparison program to not always read the next sequential record - at some points I want to go back to the previous record, or skip forward to the next record, but stay within the Do Loop.
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Oct 8, 2009
[Code]...
With the code above, I'm trying to create and insert records into a MySQL database. The issue here is that not all records are inserted. If the XML document I'm reading from has 80 records, only 40, or 66, or some other number get put into the database. I'm guessing this is because the code is trying to insert the records faster than the database can handle them? What would the correct way to make sure the record is in the database before moving on to the next one?
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Jul 12, 2010
Im doing a project in which i need to take backup for the database each and every month while doing this the previous backup is replaced i dont want to replace it. every time i create backup it should remain there im using access as database?
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Nov 27, 2009
I am trying to backup an SQL database but can't get rid of the error:"The process cannot access the file 'C:Original.MDF' because it is being used by another process" Once I open a form, using VB2008 from Visual Studio 2008, closing the form and/or connections to the database seem to have no affect.
FileCopy("C:ORIGINAL.MDF, BACKUP.MDF") ' Works prior to opening a form that uses the SQL database
frmTest.Show ' The form uses the ORIGINAL.MDF database
frmTest.Close() ' Has no effect
[code]....
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Jun 2, 2009
I have written a piece of code for my backup. It looks something like this:
Dim con As SqlConnection
Dim cmd As SqlCommand
con = New SqlConnection("Data
[code].....
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Mar 25, 2010
I am making a VB.NET application that can download/backup the database that is currently on a remote server. I have Remote Server IP,Username,Password and Database name. I am also able to connect to it. But I don't know what to do after connecting to it. I don't know what all files are need to be backed up. (I think database and log file both must be backed up, I am not sure).
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May 20, 2010
I have a program using the OleDbCommand to read an indexed Access database. [code]I notice that when step debugging the program, the file is not being read in correct order.Example: it will read the record with "B" in the D01 field before a record with "A" in the same field.The record with "B" is the second record in the database.I do note that all records in the database are read before exiting the loop, just not in any apparent order.
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Jun 8, 2010
I am using ExecuteReader commands to read records in large external databases. Part of my program logic requires that a condition of the database be examined without reading another record - for instance, I want to know if the database has reached the end without reading an additional record.
[Code]...
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Jan 24, 2012
I am using sockets to send message between computers. I send the messages alright. What I want is when the message "x0x" comes, the client must be closed within 5 minutes. Teh admin can cancel the request by sending message "-xx" as well. The routine that checks for incoming connections and accepts messages uses WHILE TRUE...END WHILE since it must always listen. Once I get a message, I need to fire a timer control or other that fires within 5 minutes. But the program cant leave the WHILE TRUE at all. If i exit it early, the timer fires and the program does get exit. How do I fire the timer or other routine while still the WHILE TRUE routine checks for incomin connections and messages?
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Apr 17, 2011
is there any way to reference a particular code routine in VB.net external to the current loop/routine?Example:
If Var01 < 5
[Routine A]
Else
[Routine B]
End If
where Routine A and Routine B are code sequences at the end of the entire program -- such as outside of the current sub or class? The idea would be to reference an otherwise repetitive 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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Mar 3, 2009
I have a sub routine where I pull in information from a database. I want to use variables from this sub routine in another sub routine. I tried making everything public but it doesn't want to be friendly and share.
Dim strEmail as String
Public Sub readDB()
strEmail = "whatever@doohikcy.com"
[Code]....
The readDB would read the database and set the variables and do whatever it needs to do. Then when they submit the form it would e-mail the form to whatever the email address was.
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May 31, 2011
I have a program that when I run it, it creates two files. One file is deleted every time it runs and the other is deleted only if I specify for it to be deleted. If I do not specify for it to be deleted and I run the same execution, the program complains. I want to be able to make a backup copy of the existing file and have that backup copy set to a file number increments every time it is backed up.
This is the command line that is sent to the program: relap5(program) -i input_file.i -o Output_file.o(this one is deleted every time) -r restart_file.r(this is the file that I want backed up.Here is a image of the gui that I created that does the above run for me.
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Jun 5, 2009
All it is is that when playing World of Warcraft people are having to clear their cache for the game to operate all the time, if they don't do this then the game bugs out in some places - so I thought of this as a way to get better at VB .NET by making a small application that asks for the directory of their WoW folder, searches through their cache folders and deletes the ones that they are also asked how they'd like to delete.I don't plan on actually releasing this in any way, I just want to make it to further my VB .NET skills and hopefully get a little better.
Anyway, it doesn't make sense much, sorry about that, but all I want to ask is if this program will work on any other computer or will I have to find a way to deploy it?Also, one thing that I thought I should put in this program is a backup function just in case something goes wrong. I just thought of moving the cache files that are being deleted somewhere else but this will move the files and folders one-by-one, is there any way I can make a certain type of file that only this program can read, where the files being backed up are placed in?
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Feb 29, 2012
I need to create an application that will restore a user's mapped drives from a database. To do this, I need to create a script that will automatically back up the user's mapped drives on logon.
What would be the best way to go about doing this?
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Dec 9, 2009
How do I create a Login Verification routine (Login Form) in vb.net . i have an windows application with login form contain user name , password , ok button and cancel button .
as this one:
Imports System.Data.OleDb
Public Class LoginForm1
' OK button
[Code].....
but i want to run my application from desktop and will get confirmation if the user name and password correct by checking them in MS Access Database in the server.
so the the application in the desktop and the tabel of user name and password in the server.
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Dec 20, 2011
I have a class that exposes an auto implemented property Enabled
[Code]...
But If I had not use an auto implemented property and declared my own backing-field as follows this is accessible from the subclass: Private _Enabled as Boolean ---- EDIT ----
The abve line is incorrect - this is not possible, it was in fact Protected in the original code which allowed access from the sub class See @JonSkeet answer ---- EDIT Of course I can just access Enabled from the sub class to work around this but can someone explain why this is the behaviour?
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Sep 9, 2011
I have a for each loop in vb.net for this particular example there are 2 items in list but after the first item the loop exits are there errors in the code [code]
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May 12, 2012
the program compiles properly, however during the saving and loading part of the code, "btnSave" and "btnLoad" subs, the program only saves the data from one of the text boxes even though it should loop 4 times.
Public Class Form1
'Declarations
Dim intEmployeeAdded As Integer = 0
Dim strSelectedName As String
[code]....
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Mar 19, 2010
I seem to be having a lot of trouble with this project. I am trying to update this atabaseI know that the routines are working (atleast the delete and update of records),but it seems to be going straight from the If statement right to the End If and not attempting the ElseIf statements. If it is something simple...sorry for the dumb question, I'm very new to rogramming in general.
Public Sub Delete()
Dim lngRecordNumber As Long
Dim StartTime As String
[code].....
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Jun 25, 2010
This is my frist post on the forum So I hope I am giving enough info, If not let me know if there isanything I missed.I have currently completed a project where I do a Query in SQL Server 2000 in VB 2010 and produce reports for each Tax id. When I Debug the program it finds the number and processes the reports, when I just let it run as an executable it does not pick up or find the number.
This number happens to be the last number coming back from the query and it processess in a loop while Not filename.EOF it goes thru 4 seperate routines and then loops back to get the next taxid. I did not put any routines to sleep and I am thinking maybe the application is just stepping on itself, could this be right? Thecreatereport path does a sql execute for the appropriated Table against the TaxID an the current Cycledate, then produces the report va CR2010(beta) and exports it as a pdf file to a directory on the shared sever.
[Code]...
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May 19, 2012
Is it possible to skip to next statement while for loop is still being executed? [code]
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Jul 26, 2010
My Application uses For...Next loops to read a spreadsheet into a DataSet and then display information from it based on the results of search conditions (search term and a date range).I'm having a problem with the data where, if I run a search that should return the first 400 rows in the spreadsheet, I'm only getting around 200 results. I know the search should return the 400 rows because I checked it in the spreadsheet before running the search.I think my problem might be caused by my date comparisons. I think the problem might be that I'm comparing String valueHere's my code:
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
If ListBox1.Items.Count <> 0 Then : ListBox1.Items.Clear() : End If
[code].....
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Nov 4, 2009
The load event goes through two different List(of T) in its own For Each loop. When the form is run for the first time, the first list is populated, the second one is not so the first loop runs but the second one does not. Then an integer that would normally be modified by the second loop remains at 2 and is assigned to a private variable integer, _handsRemaining.
Here is what it DOES. It runs through the first For Each loop and populates the appropriate field. It ignores the second loop because there are no weapon Class instances in that list. Then it goes wrong. It IGNORES the remaining lines (including the third MessageBox.Show) and somehow assigns a value of 0 to the private variable, _handsRemaining.
Private _handsRemaining As Integer
Private Sub Inventory_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Dim hand As Integer = 2
[code]....
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Jul 20, 2011
I have two datatable that I pull information from a db. I have a complicated form, and I have found it easier to write a simple SQL statement to pull the records. I have then used other controls on the form to trim the info down even further. When a particular falls out of the secondary control it is then deleted from the datatable.
I am then going back through the datatable and performing other actions on the datatable. When I narrow the information, sometimes I'm getting a DeletedRow is inaccessible. I have been looking at a way to do an IF statement to see if a row has been deleted, but I haven't figured out a way to skip a deleted row. Is there a way to skip a deleted row that I'm not seeing.
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Jul 1, 2011
I'm hoping somebody can help me with this... I am reading an XML file created from the server and all is good except that when I try to process the file it's always skipping one of the first child elements. And when I run a test with no processing, just a straight reader and looping through the elements, the 1st element is there. But as soon as I add a check to see if the node is an Element, it skips an "Attachment" element.Here's my XML:
[Code]...
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May 31, 2011
How to use the ExecuteReader calling a stored procedure with a parameter array?
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Jul 30, 2009
I have a text file 'source'. I want to skip 4 lines then grab the 17th through 33rd characters and assign them to a variable. Then drop down to the 9th line and grab the 10th through the 19th character and assign them to a variable. Then skip to the 27th line and write each line to another file with these two variables appended to the end of each line. I can write the lines to another file easy enough but I'm not sure about skipping around from line to line or grabbing the variables.
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Jun 18, 2012
I'm not really sure how to word it, if it is possible, but part of my program reads from a text file. It then pulls out the necessary information needed from that file by finding key identifiers. Right now the code is written to find the first key identifier and then read each line after that, locating each subsequent identifier and pulling the data from it. In a few cases, the format examples I've worked with are a bit different which results in a runtime error. How can I tell the program to essentially skip that part of the text file if it's not reading it right and continue moving on? Here is somewhat of an example of the text file.
DID/"DATA EXTRACTED HERE"
NAM/"DATA EXTRACTED HERE"
STR/"DATA EXTRACTED HERE"
[code].....
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