Using ONE Module With All Data Connection And Recordset Opening And Closing Options
Mar 19, 2012
Finally starting some coding in VB.Net, I notice over the years, that we can say (in VB6)
Code: Dim MyForm_Stock as NEW frmStock
in the same session, being able to open, say 3 Stock Forms at the same time and maintain details independently of each of the other forms. Also am I able to maintain separate Database connections and the same table being opened and updated independently of each other by each separate form. What is actually taking place in terms of memory being used by each process? My ultimate goal is to be able to have ONE Module with all the possible data Connection and Recordset Opening and closing options, which I have failed miserably to do in my VB6 experience. Data access is an obvious module based set of subroutines. Others could be Date routines eg, Week Number of the year, Days Diff, Days to, etc. [Code]
When connecting to a Sybase ASE database via ODBC using the code below, I'll occasionally get a '[IM006] [Microsoft][ODBC Driver Manager] Driver's SQLSetConnectAttr failed' error. this be caused by my code? I read here that I should be using the 'With' statement instead, but I don't understand how that would affect this.
I have made a PRN file using the "Print to file" option, and now I want to make a VB.net application that will print it directly to a TCP/IP printer which is not currently installed on the computer. Is it possible to achieve this by simply opening a connection to the printer's IP and sending all the bytes of the PRN file to it, or is it more complex than that?
I am trying to build a stand alone programe in VB.net (Most of my Experience is in VBA) I am using Visual Studio 2008 and have created as part of my project an SQL Server Compact database (Database1.sdf)
The problem I am having is that I can not seem to work out how to connect to this database and retrieve the data into a recordset to work on. I am sure it must be a simple task but I can not get it to work.
I have tried two ways, first is via ADODB connection
Dim strsql As String Dim rsRecord As New ADODB.Recordset Dim ConsDataADODB As New ADODB.Connection
I am making a program that edits my website with the input that I put in. But, it is requiring multiple forms (obviousily), but I don't know how to make it close the one I am in while opening the other. For example: I have a form that opens first that requires a Username and Password, so nobody can obviousily use it without knowing them. When I submit the correct username and password and go on with the editing, I need the login form to close. I do not know the coding for this part. Is it:
When it comes to database connections what is the difference between closing a connection & disposing a connection? I'm hoping to gain a more technical understanding of what happens when each is called & the effect on the database.
So i want these If statements to first see if discharge date has value and admit is null to do this ... and inorder to do this i have to open my other SQL reader which is dr1. becuase at this time i have dr2. open. How do i get around this since i cant read from two stream writer at the same time.
If dr2.Item("DischargeDateTime").ToString <> "" And dr2.Item("AdmitDateTime").ToString = "" Then 'patien is showing a dishcharge dat but NO Admit date
I have form1 and form2 and have when a user clicks on an icon on form1 it shows form2 and hides form1. But how would I get it to when a user closes form2 it will show form1 again?
I'm currently working on a project where we're doing some automated testing.We're using a Rohde and Schwarz Vector Network Analyzer to do our testing, and the interface it provides for communication is GPIB. On my laptop it simply plugs in as USB.
I want to make a program where I can open a program, and my vb program starts with it. My VB program will then use a timer to count to an hour, and then close out of both programs. So i started experementing with things and this is what i came up with:Dim myprocess As Process = System.Diagnostics.Process.Start("C:\Program Files\Internet Explorer\iexplore.exe")
That opens my program fine, but I dont know how to close it from there. Also I want my vb program to start automaticaly, not hit a button and my other program shows up.
I got stuck up with one issue of inventory/stock calculations and put my problem in four threads and grasped some ideas and thoughts for that. But could not find SQL query for this issue in those threads. i am able to construct SQL query for stock/inventory calculations. Since I could not find any SQL query as an example on this issue inspite of spending a lot of time and search, deifinitely there might be so many examples but i was unable to reach them, so after constructing this query i wanted to share my humble effort with all. It may be a second thought for beginners like me having the same problem.The second purpose of placing this query here is to welcome improvement or alternate of this query.
I have created a splash screen and it fades in. When the splash screen closes, the main form (MDI) should open. The main form opens but then immediately closes. vb Public Class frmSplash Private Sub frmSplash_FormClosing(ByVal sender As Object, _ ByVal e As System.Windows.Forms.FormClosingEventArgs) Handles Me.FormClosing 'Open the MDI form. frmMain.Show() End Sub [Code] .....
It is my goal to write a program to run a retail store. I am an intermediate Access developer, so I have a good grasp of the basics.However, I find that developing in VB 2010 is quite different.I will have forms for:
Company Information Employee Information Supplier Information Customer Information Invoices & Purchase Orders
All I really need to know at this point is the code to open and close each form.
I have many Listviews in my Form and Im retrieving stored procedures to populates my Listviews. Is it necassary to close the connection to SQL Server once I have finished populating my Listviews?The angle which im coming from is that every 30 seconds or so I need to re-populate my Listviews with the latest cut of data from SQL Server therefor Im probably going to slow down my application if it has to connect to SQL Server every 30 seconds to get the latest cut of data... instead of keeping the connection to the SQL Server Stored Procedure live so that I can use some sort of method to refresh the data?
I'm connecting to an ftp server in my .net application. After I send the file and try to close the connection, I'm getting an error. I'm trying to send the Quit command to the FTP server but getting no reply. I'm not sure what I'm doing wrong. I call this method: [code] Do you think something is wrong with the code of could it be a problem with the ftp server?
Is it necessary to close the connection of a tcplistener or tcpclient after every message received, or is it possible to close it at a later time while it continues to receive data? Is there any major security issue with leaving it open and listening? I know trojans tend to open a listener and leave it open, will my program be detected as such? Its just a simple chat program....
I'm writing a Windows form application in VS 2008. In the application I need to move among several SQL express databases (.mdf). I'm using the following commands to change the connection:
I can see the form is showing data from the 2nd database. However, When I tried copying the 1st database (for a Save as function I'd like to implement), I got a system error saying "Cannot copy MdfFile: It is being used by another person or program.". Actually, I found all the visited databases were "being used" untill I closed my application. How do I break the connection completely?
I get this error: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '*' at line 1 [Code]
What I am used to declaring database connection is that in every form I type the codes for it which is a tiring way. Now, I want to use module instead but I really don't know how. And also, how will I call the connection to every forms I created?
how to create modules and consequently how to use them.I need to do a database in mySql from vb.net. I have tried the usual way, that is my connecting to the database at the beginning of each of my class. I want to know if that can be done through modules, as far as i have read about that or some other way like procedures and functions. In that way, it could ease my coding in not having to write the db connection each time.
I've got a fairly large VB.NET (3.5) project that makes a lot of database calls. So I created a namespace/class just to handle those fuctions. The idea was that this single point of entry into the database would give more control over validating input from users.
So my class looks something like this. (I've chopped some code out for readability, it works just fine except for all the open connections.
[Code]...
So I can close the data reader, but how do I reach back to that original database class and close the connection. If I close it in that original class it will bomb when I try to loop through the data reader the in calling class.I'm sure this is probably pretty obvious but I'm fried from the keyboard.
I am very new to SQL and do not understand as much about the language as I had hoped I would after a couple months of looking at it. I am creating a procedure database for work where we store word documents of procedures in a folder and use that to populate our database. I've been getting connection errors because I didn't realize I was trying to use the server.CreateObject command with an Apache DB and then using the connection string with an SQL Server DB. I am using SQL Server 2008 and I just ahd no idea why it wasn't connecting because I had been googling most errors.
I'm developing vb.net application with mysql as database. The database is on other machine in the network. In one function connection opens and executes query successfully. The same function makes call to other function.This second function tries ot do same thing. But this time while opening connection it gives error-"Access denied for user 'root1'@'AZAR' (using password: NO)". Here 'AZAR' is the name of my machine. The first function uses public variable declared in module for connection, whereas second function uses local variable for connection. I'm using PhpMyAdmin tool.
