Writing To SQL Database Manually (for Education Purposes)
Sep 18, 2009
I'm building an application that is intended to function off and online using the new Local Database Cache functionality included with Visual Studio 2008. My issue however does not pertain to that directly, as I have a pretty good understanding of how to use it and how it functions. My issue is with getting an understanding on how to directly write to a SQL database.
Most of the tutorials, videos and education available when it comes to databinding makes the assumption that I need my application to pull data and edit it, but in my case all I really need (in fact intentionally all I want) is for the application on Submit to write data that it pulls from the form as a new record in a SQL table.
Here is what the program looks like now.
Public Class StatCom
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
[Code].....
At the moment the program simply does a status check for connectivity and wether it can ping the server (in this case the SQL server) for the purpose of displaying a online or offline status in the form.
I follow it up by making the status checks.
Finally I declare all the various fields I want to capture and write to the database.
What I want to do now is have a SUBMIT button that on click takes all the data in the form and writes a new record to the database I have already setup and have data connection to.
I know that the code has to be written using the .recordset functionality, but I haven't found any could tutorials on the subject that have turned on the light upstairs.
I'm developing a system to generate a water bill for a local area.In it i need to print out the bill from using the data from the database. how to generate & print the bill in vb.net.
I am a student a couple of weeks from completing my first Visual Basic class. I have a 100% score so far. Plus I am really enjoying the class and learning VB. We use Visual Studio Professional 2008 at school. I have also installed that product on my own pc from the DreamSpark site. I'd like to continue my education with VB. However, there are no classes this summer in VB at school. I was wondering if there might be some online tutorials or books that I could use to keep moving forward. I have good discipline for learning without being in a classroom.
Generally, what I like is something that shows the key points about a new topic. Gives an example of how the topic might be used in an application. Shows a code sample or two. And then gives programming assignments that use that topic. So that I can then write the applications. One of my educational goals would be to start through the Microsoft Certification process.
I've been using SQL OleDB commands to grab data from some excel files and it's working well, but I'm having a really hard time finding a good resource for the actual command strings on the web. I figure I must not be using the proper terminology in my searches. Take this line:
Dim da as New OleDb.OleDbDataAdapter("Select * From [" & sheetName & "]", Conn)
My question this morning was: Can I pass a command that will grab all sheets from the excel document instead of just one in particular?
Protected Sub GridView1_RowCommand _ (sender As Object, e As GridViewCommandEventArgs) _ Handles GridView1.RowCommand If e.CommandName.CompareTo("command") = 0 Then Dim itemID As Integer = Convert.ToInt32( _ GridView1.DataKeys(Convert.ToInt32(e.CommandArgument)).Value)
[Code]...
Basically, it doesn't work and I don't get it. I've been trying to figure this out for a few days now and I can't see what I've done wrong. As you can see I'm trying to manually update a field in my database with the value of (originalvalue)+1 when the user clicks the buttonfield of the corresponding row.
I guess what I'm asking is if anyone can point out any mistakes, please do, or if there's a better way to do this (without having to go through all the DAL/BLL BS)
I have created a local database (.sdf) and added a few records. What I really would like to do is connect to the database manually and load the records in a listview. Anyone with some tutorials?
I want to do a task with a function controlling database with vb scripting. My form will include textbox, button and datagridview to view the database table manually without add from the microsoft access or other..how i want to make the table appear when i put a number into the textbox that refer to the number of row and column and then click the button to create the database table? Besides, how to rename it using textbox?
I have a legacy data table in SQL Server 2005 that has a PK with no identity/autoincrement and no power to implement one. As a result, I am forced to create new records in ASP.NET manually via the ole "SELECT MAX(id) + 1 FROM table"-before-insert technique.Obviously this creates a race condition on the ID in the event of simultaneous inserts.
What's the best way to gracefully resolve the event of a race collision? I'm looking for VB.NET or C# code ideas along the lines of detecting a collision and then re-attempting the failed insert by getting yet another max(id) + 1. Can this be done?
I've been messing around trying to get an INSERT statement to work, and because of this, it has created lots of records in my database that I dont need or want.
The problem is, when I open up the table by right clicking on it in the database explorer and selecting "Show table data", I click on the record I want to delete and the following error comes up in a message box[code]...
Is it possible to manually save data from my dataGridView to my SQL server database table?
if it is possible can some please tell me how to do it because i don't like using the data sets and reader VB has because it doesn't give me full control over the procedure.
please see the code below it all works fine its just the last two line im struggling with, which is where i am trying to save the data from the two columns in my DataGridView [code]...
I have a user control which consists of a dataviewgrid with some extra panels controls etc.I have just updated this program from an old version of vb where the tab control was just a row of tabs with no actual child pages attached.so to use several of these userControls (called 'Pages' from now on) a Panel was created and placed underneath the tabs to give the illusion of tabpages.when a user clicked a tab the relevant 'Page' was brought to the top of the Z order. This was accomplished with a directory of the 'Pages'..This all worked fine until I decided to change to using the TabControl in VS 2010.
So I didn't need the Panel anymore I just added the 'Pages' to the TabPages instead and I could also get rid of the directory to access the pages as it is not needed for display purposes anymore and for other access I could use the Tabcontrol.TabPages collection instead.Now when each 'page' is created and setup the dataviewgrid is loaded with a Table and the columns are re-ordered.I am loading approx 20 'pages' to the tabcontrol 1 to each newly created tabpage obviously. this is done using using a for each loop from a DB table.now the problem is that the first 'page' dataview grid has the columns re-ordered but none of the others do ! the Data is fine it's just the column order that's wrong.the same code is used for all (The setup is method of the 'Page') and i have stepped through the code and it all works OK with no exceptions. no code is missed but the grid order is OK for the first 'page' but not the others.everything else works fine the 'Pages' are all on the TabPages and the data is OK..Now comes the really weird bit! if I add the 'page' to the old unused panel before i add it to the Tabpage all the grids are re-ordered fine as in [code] Now the Panel is visible but not on screen if you see what i mean obviously if i move it on screen it's empty as the 'page' control can only be in one place and it's on the Tabcontrol..so why is it working ONLY when I add it first to the unused Panel? what is happening here? Oh BTW it only works for this Panel - not if i create a new one and add it to that..AND if the Panel Visible property is set to false the columns are not re-ordered again? I have tried deleting the panel and all code that uses it but the grids are not ordered properly till i re-instate the panel?
I have a datagridview that is scrollable due to number of columns necessary.When I edit a cell, I display a multi-column listview that shows the item that will fill the cell in the first column and some form of description or other information in the second and sometimes third column (this should answer why I didn't use a combobox in the column in the first place).When I display the listview, when I scroll the datagridview, the listview stays put (as is the obvious). Is there a method to anchor, for want of whatever the proper term is, the listview object to the datagridview cell associated with it so when I scroll, the listview also moves? Or do you have to do calculations and adjust the positioning and repaint the object?
I was wondering if there is a way to take an object in Visual Basic 2010 (Express, FWIW) and browse through its structure to visualize how the data inside is laid out.For example, I have an object called "model" that is populated by a function that is a black box to me. Model is set by a "read" function that loads a DXF file from disk. The read function isn't very well-documented.
What I've discovered is that model.Entities ends up containing a list of different objects, all with different properties. I'd like to be able to simply browse this list of objects and view their associated properties and values at run-time, similar to how you can use Intellisense to view a list simply by typing "blah." and waiting for the pop-up to appear.A tree view that you can pop open and closed would be excellent. Obviously this has to work during run-time rather than in the editor because the file hasn't been loaded if the program isn't running.
Is this something that's possible in Visual Basic 2010? Is it a built-in feature I can't find?
I am using Visual Web Developer 2008 Express and making a Webform. I want to arrange my labels and drop down listboxes in a table to keep them together on the form in a neatly manner. If I use the 'ToolBox' on the side and drag a HTML table to the workspace I get a nicely formatted table with 3 rows and 3 columns. And I can drag and drop my labels/listboxes into these columns and all is fine and good.
If I use the 'ToolBox' and drag a ASP.Net table to the workspace it starts as just a boarder with '###' inside of it, which I cannot drap and drop controls into. I'm not sure how to place controls into it. I figured out that you can add the Rows - then Columns in the properties window, but that just adds more cells which have the '###' in them. I can make it work with the HTML table, but I just want to know if I can do the same with the ASP.net table.
Basically I want to write to a database, lets say called testdatabase, and I want to write to a table called dbo.Test_table, under three different colums named one two three. How do I go about this? I created a data set connection to the database but it sits on the right hand side with the other forms and I dont know how to use it or write to those colums in the tables.
I'm makin an application which will calculate the amount of carpet needed to floor a room, i would like to add in an order management bit too the application so that the user can add, delete and amend pending jobs. I'm a bit of a beginner so i don't know which way is really best to go, should i use file writing on database? I will be takin values from variables and textbox's if thats of any importance.
I have a table in a database with 3 columns: OfferName, ExperienceAward, and GoldAward
I populate a combobox with the various offer names with the code below:
Dim con As OleDbConnection = New OleDbConnection( _ "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:UsersDouglasDocumentsVisual Studio 2008ProjectsGameBoxRPGGameBoxRPGContacts.accdb;Persist Security Info=False") Dim cmd As OleDbCommand = New _
I'm currently under way with a computing project for 6th form and I have encountered a problem when working with a local database.
To give an overview:
-My program is intending to take in data on lorries, drivers and other sections of the haulage industry through multiple forms and afterwards be returned in a suitable manner.
-I have no trouble in reading data from my database that I have set up. However I am unable to write back to the database.
-I can add the relevant new data to either the specific table(Driver_Table in this case) of the Database1DataSet.xsd or to a table set up in this manner.
-My problem is with the Driver_TableTableAdapter.update method.
-When I call this it returns a value of 1 (for one row added) but does not write this to the database.
In specifics the particular section (created to test this section of code) is:
'Dim tbl As New Database1DataSet.Driver_TableDataTable Driver_TableTableAdapter1.Fill(Database1DataSet1.Driver_Table) ' Driver_TableTableAdapter1.Fill(tbl)
Im trying to get my program to fill out textboxes with information it reads from a database, and then save the changes to the database. Does anybody know any good tutorials of this which i could look into?
I want to be able to click on the save icon and have the data on the form save to the original database. Right now I seem to have a disconnected dataset I have tried to change everything from read only to a false statement but it just will not work. It saves to the form fine just not the orignial data base.
I have written a program that has a form called AddMembers. it is supposed to get users input from textboxes and write them to an access database. but I am getting an error message Argument not specified for parameter. Also my results are not sent to the database. I have attached both the zip program and also the database.
I'm currently doing a project, I have 5 text boxes, and the information I put inside them get's added to a record in my database..In this record, an auto-number is allocated, and I need to display what the auto-number allocated is..
I am trying to write the value of 3 variables (Username, Email, Password) to an SQLite Database. I can write text to the database but not a variable. How would I do this?
I am trying to write data back to my database in my project, but it keeps disappering when I make any changes to code. I can build the project, add data, close the project and build it again and the data is still there. But as soon as I make any changes to anything, on the next build, all of the data is gone.
The table will not be bound to any controls in the final project, but for testing purposes I have a datagrid control that it is bound to. My code started as follows:
I am creating a fault tracker AKA issue tracker. It is going to be very simple in functionality. As of right now I am using a text file as a database for the end user to store current issues.
The reason for me using a text file is that I do not know much about database programming and I cannot find any simple examples in the same usage. My question is, is it really going to become a problem as more issues are added to this file and it becomes larger? I.E using up more resources, application getting slower etc?
If so, could anyone point me in the right direction to creating a simple database application. Most examples I have seen require ask to download their pre-made database. Although I would like for the program to create a database if one is not there.
