I'm fairly new to VB.NET and I'm looking to create a module that will contain all general SQL functionality like connect, disconnect and execute a sql query etc. I think I'm almost there but the code keeps bombing in one place. Can anyone see what is wrong with the following code?
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I'm trying to create a program that will disconnect/connect you from the internet.Example:When I press F10, I get disconnected from the internet. When I press F11 It connects me to the internet.
View 4 RepliesBasically, we have three databases to grab data from. One is a SQL Server database, one is an Access database (which is particularly annoying to connect to because we have to map a network drive and such), and the final one will be an Oracle database when IT finally gives us rights.I'm thinking about creating a helper function that makes querying any one of these databases as easy as possible. I want to create a two-dimensional array
Dim myEasyResultArray(10,10) as String
myEasyResultArray = DatabaseHelper("Access", "SELECT * FROM Employee")
Is this a good design decision? Also, how can I have the array be the right size? Can I just do this?
Dim myEasyResultArray = DatabaseHelper("Access", "SELECT * FROM Employee")
Should this be a module or a class? I don't really need to share variables?
For an answer to this questions I've been looking years from now, then I couldnt find it and now it's complicated. I am working on a project to fully manage a computer's connection, it can check IP, change it, etc. But, I really, really need a function to sucessfully connect/disconnect a PC from the ineternet without promps or other screens, IPCONFIG and DHCP command aren't useful!, im exploring RAS but couldnt come to anything yet
View 1 RepliesI have a VPN connection set up on my computer. I am trying to make a button in my VB.NET program to connect/disconnect to/from the VPN connection. I have tried making a shortcut to the VPN on my desktop and calling it with the Shell method but I get an error saying file not found. I have also added the shortcut extension ".lnk" and still have the same error.
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I am thinking about creating a program that when a browser (such as IE) opens it will turn my connection to the internet on, and when the browser is closed it will disable my connection. What type of things do I need read upon in order to accomplish something of this nature?
View 2 RepliesI have a VPN connection set up on my computer.I am trying to make a button in my VB.NET program to connect/disconnect to/from the VPN connection.
I have tried making a shortcut to the VPN on my desktop and calling it with the Shell method but I get an error saying file not found.
I have created a parameterized query in my tableadapter. Here is the SQL:
SELECT CalcinerID, Comments, CorrectiveActions, CrucibleOxideWt, CrucibleWeight, DCPressure, DCTemperature,
Date, DischargePressure, FeedPressure, FiredCrucibleOxideWt, GmSampleWt, LIMSNumber, LotNumber, MaterialType,
OperatorID, QualLabOperator, QualLabTimeStamp, RecordID, ToteBinNumber [code]....
When I use the Execute Query button in the Tableadapter Query Builder, the query works fine; I get all the rows I expect. However, when I run this in my code, the query behaves like an equality statement (i.e. Lotnumber = @Lotnumber) rather than a LIKE statement (Lotnumber LIKE '%' + @Lotnumber + '%').Here is the code that is not behaving correctly. Note that I have a textbox, LotSearchTextbox, where I enter the portion of the Lotnumber that I want to use as the filter. I also have a button, LotSearchButton:
Private Sub LotSearchButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles LotSearchButton.Click
Try
Dim SomeNumber As Integer = Me.LotCalcinerO2TableAdapter.FillByLotNumber(Me.CalcinerDBDataSet.LotCalcinerO2,[code].....
why the query works in the Query Builder but not in the code?
I have a data table that looks like this:
USERNAME ICOUNT IAVERAGE DATE_LOGGED
LAGX01 1245 1245 05-07-2012
LAGX02 2211 1422 05-07-2012
LAGX03 1698 1112 05-07-2012
LAGX04 4598 1555 05-07-2012
LAGX05 2589 3245 05-07-2012
LAGX06 3321 1155 05-07-2012
LAGX07 3698 3458 05-07-2012
LAGX08 2589 4587 05-07-2012
LAGX09 1598 1142 05-07-2012
LAGX10 3156 1987 05-07-2012
LAGX11 5547 2011 05-07-2012
LAGX12 9456 3459 05-07-2012
Now, I want to execute a sql query that will display the top 5 based on average, so i did this:
SELECT DISTINCT USERNAME,IAVERAGE FROM myTable WHERE IAVERAGE > 0 AND DATE_LOGGED='05-07-2012' ORDER BY IAVERAGE LIMIT 0,5 and the result is:
USERNAME ICOUNT IAVERAGE DATE_LOGGED
LAGX03 1698 1112 05-07-2012
LAGX09 1598 1142 05-07-2012
LAGX06 3321 1155 05-07-2012
LAGX01 1245 1245 05-07-2012
LAGX02 2211 1422 05-07-2012
Now, I want to numberize my query result, so it will look like this:
RANK USERNAME ICOUNT IAVERAGE DATE_LOGGED
1 LAGX03 1698 1112 05-07-2012
2 LAGX09 1598 1142 05-07-2012
3 LAGX06 3321 1155 05-07-2012
4 LAGX01 1245 1245 05-07-2012
5 LAGX02 2211 1422 05-07-2012
I want to create some reusable code in my forms.The idea is that a class is growing when more subroutines are added so, I need to store the finished subs somewhere to make place for others, this way I don't lose myself searching through the entire class
View 4 RepliesIn Vb.net, we have something called a "Module" that provides a global scope whereby static functions in the module is visible throughout the entire project.Is there such a functionality in Java ? (i.e. adding static methods that are available to multiple packages/files/classes without having the need to import .* )
Ok I am aware this is a functionality that would cause alot of debate, but really the point of this thread is not to debate about this functionality.
Do you know which module in VB.net will allow me to connect to a file (mdf/mdb) and SQL Server (not at the same time but to change in runtime).Or do you know of two modules which have the same API?
I'm building software which I will wont work both locally and on a server. But I don't want to have to go changing all of my code just because I'm using a different modules. I know VB.net, but I've never used databases.There's so many different database connectors its confusing!
i have 4 different handles buttons with code how can i connect them in another "general button" that will make the 4 buttons to work with one click
View 3 RepliesALTER DATABASE test SET ENABLE_BROKER this is the sql query i wish to execute while program is executing.because i do not want to everytime i change computer also need open sql management tool to execute this query rath
View 3 RepliesI want to create a User-Control that inherits the functionality of a TabContol.
I begin by starting a new project of the type Windows Form Control Library. Next I place a TabControl on the UserControl designer surface and Dock the TabContol to Fill the UserControl.
I go to the code editor for the UserControl and enter the following line of code.
Inherits System.Windows.Form.TabControl
Then I run the program and get an error. Intellisence recommends that I use one of two recomendation. When I accept the recommendation I and try to run the program the problems esculate.
The design-surface is no longer accessable.
I try to comment out the problem lines of code in the UserControl1.Designer.VB file but that doesn't help.
How can I create a UserControl that Inherits the Properties of the TabControl so that the properties of the TabControl are visable in the Properties Window?
There is a "submit" button and a textbox, when the button is pressed, i want to connect to access database and search for the entered text in the textbox . if true i want to show "okay" a string .
View 4 RepliesHow to execute a query in visual studio 2008. What is the smooth process?
View 2 Repliesi got an execute non query error... heres the
Private Sub btnUpdate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnUpdate.Click
Dim da As New OleDb.OleDbDataAdapter
Dim ds As New DataSet
Dim obj As New OleDb.OleDbCommand
[code]....
I want to create a Class Library that has forms to that the users can perform some functionality. Is that possible in VS 2008? I believe it is, but can't find any examples out their to provide a template or a guide to create mine. What I am trying to do is put common functionality in a class library to multiple applications that I create can access this class library to perform some functionality.
View 3 RepliesI don't like the verbose way of adding DataRows one by one via Tbl.Rows.Add, so i've created this pseudo LINQ query that does nothing but adding rows implicitely:
Private Function GetData() As DataTable
Dim years = {"2010/2009", "2009/2008", "2008/2007", "2007/2006", "2006/2005", "2005/2004", "2004/2003"}
Dim tbl = New DataTable
tbl.Columns.Add(New DataColumn("Year"))
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As you can see i don't need the result of the query at all, it's only purpose is to iterate and call DataTable.Rows.Add. So the result is already available in the DataTable itself and not needed from the query.Admittedly this question is somewhat hyphotetical because there would not be a big difference in using f.e. ToList and normally a query's purpose is to return something.But anyway, what's the cheapest way(in terms of memory consumption, execution time) to execute a LINQ query when only the execution and not the result matters?Edit: Ok, thisquestion was a quick-shot and a chicken-and-egg problem. I wanted to reduce 20 lines of code to a single line but noticed that i need some kind of DataSource for the LINQ-Query. Therefor i've created the Array. But at this point i could have simply used a for-each loop as well to add the DataRows.
Conclusion: Use a LINQ-Query for what it's for: a query. Then this question is pointless since there is no cheapest way but only that which returns the correct result.
I would like to run a query in background (using a BackgroundWorker) in this way[code]...
...but, because of deferred execution, the actual getting of the data does not happen in the "BackgroundWorker" thread, but in the "RunWorkerCompleted" Sub, making the BackgroundWorker itself useless.Is there a right way to do this without looping through the "MyQuery" to get the results and copying them to another object to pass it to the BindingSource?
I'm testing the Compiled Queries for the first time.[code]...
View 3 RepliesI'm trying this for long time and I still can not figure it, I'm trying to query a database "password" with the field to check if the login is there "login" and if it find the login in the table execute start.show() but I still geting errors.
code.
Imports System.Data.SqlClient
Imports System.Data
Public Class login
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How can i execute my query to insert records in tables?[code]...
View 7 RepliesPublic Class Customer
Private m_CID As Integer
Private m_FirstName As String
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My question is that do I need to add an OID in customer class or I can directly send a query to customer table when ever an order is made.
Whenever I run the form and complete the procedure then I need to go back to sql database and click on execute. I want to avoid everytime going back and executing each entry because if I don't execute everytime then the further other [b]form data [/b]will not be[b] retrieved[/b] properly as the [b]previous form[/b] will [b]not be updated[/b]. I hope ur understanding ...
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I'm new to VB.NET. I'm trying very hard to not go screaming back to VB6...... I have a Query stored in an Access2000 database called 'build_VNMON'. (Does that make it a Stored Procedure ?) It uses multiple tables and multiple Union Statements to arrive at the desired results. It may not need to be as convoluted as it is, but I inherited it, and it works. What I really need is to output one column of the build_VNMON result to a text file, so I'm trying to use an OleDbDataReader.
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I have a form set up where I want to run the function PopulateGrid on it's Form_Load event. I have initialized the DB connection as follows:
Private Sub Main_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
LoadConfigFile()
cn = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0; Data Source=" & config("DatabasePath") & ";")
cn.Open()
End Sub
Now, I want to run the PopulateGrid function directly after I connect to the database as shown above. I'm confused as to how I'd use a database query in a module when the database is initialized in my main form. Would simple setting the variable cn to public work?
When I try to start a USB Modem application, which was working normally by the way, it gives me this message.
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I am trying to do a simple query of selecting an ID number from one table and matching it with the ID number in the other table, however the catch is the two tables are stored on two different sql databases.[code]...
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