Make A Database Application That Can Write/retrieve Cells/datasets From/to A Database
Apr 8, 2010
i need to make a database application that can write/retrieve cells/datasets from/to a database i buyed a book in there was an example of how to create a database application while debugging i had the "Object reference not set to an instance of an object." error and it highlighted this code
objDataRow = objDataSet.Tables("KlantenTable").NewRow
now the problem is here i declare something later in the code i write to it
objDataSet.Tables("KlantenDataTable").Rows.Add(objDataRow)
[Code]....
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Sep 6, 2010
this is my code and it has an error "Command text was not set for the command object."Dim con As OleDb.OleDbConnection = New OleDb.OleDbConnection()
Dim sSql As String
Dim command As OleDb.OleDbCommand = New OleDb.OleDbCommand(sSql, con)
Dim adapter As New OleDb.OleDbDataAdapter(sSql, con)
[code].....
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May 13, 2010
I have an application that uses an access database to fill datasets. My problem is that I have three related tables, when I add a new users to the customers table The parts table fills with data saved in the database with a cust_id of -1.
I discovered that this is caused by adding a part, not saving it and deleting the customer. I Can add code to stop the user from deleting a customer that has parts but I do not have access to the live database to delete the record that are incorrect.
Is there something I can do to delete the rows that have an id of -1 on the load statment?
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Feb 9, 2010
I'm trying to write a program to call Quickbase and retrieve a database and put it into an array. It's a contacts table that I need to be able to query and select different fields according to letterheads, memos, etc. I've tried to do this three different ways.
1.) Find a direct port or some way of accessing Quickbase directly, similar to connecting to an oracle database or MS Access.
2.) Export the table to MS Excel and read the data from a spreadsheet.
3.) Opening a web browser in a background processes and login to the Quickbase account, then navigate using the little XML knowledge that I have.
I just can't find a good way to do this. Any ideas or can give some help on the code to do any of the ideas?
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Nov 3, 2009
Is it possible to write to an access database that is an MDE, from a .net application?
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Jan 30, 2010
I'm trying to get my application to read to and write from an Access database. I am running Windows 7 x64.
If I disable UAC, I don't the error. If I have UAC enabled, then the error occurs. Here is a screen shot of the error:
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Jan 17, 2011
I have a report made in Crystal Reports XI. The report is generated and exported to PDF in visual basic script using COM interface. Generally everything is running smoothly, but in one case generation breaks with error: Failed to retrieve data from the database. Details: [Database Vendor Code 9421]
Database used is MSSQL 2005 connected over ODBC to CR XI. When I am opening report with exactly the same parameters in Designer, everything works fine.It looks like it is data related, but it is hard to trace since the whole report is pretty sophisticated. Anyway I spent half a day on crawling over Dr. Google and it seems that he has no clue what might be an issue.
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Feb 17, 2009
Basically, i have to write a small application that just writes in certain cells of a set page of an excel sheet, the sheet will always be the same layout.
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Jan 12, 2009
My understanding of databases (access and sql) is fairly limited, though i have got a couple of programs under my belt using access databases, not yet used SQL. I could however, work around to figure out a way to do what i'm trying. What i don't understand is the need for all of the components, so all i'm after is somebody who can take the time to fully explain these further to me, or point me in the direction of somewhere i can gather a full understanding.
My questions are, for now;
1. Why do we need to take a copy of the database, rather than dealing exactly with the database itself?
2. What differences are there between datasets and datatables, what is better for what and why?
3. What is the purpose of the data adapter?
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Jun 2, 2011
I've been having a problem adding a record to an Access database using datasets and da.update etc. I'm trying to create a simple program that displays the records of a database table in a series of text boxes. I've managed to get my next and previous buttons working correctly and my update button works correctly too. The problem occurs when I try to add a new record. I keep getting a "Syntax error in INSERT INTO statement" whenever I click my add button.
[Code]...
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Nov 3, 2009
I want to Make DATA Base Application ! Who Save DATA in XML?
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Dec 14, 2010
I'm trying to make a chat application in Vb what uses MySQL database.
Here is the code for the UpdateChat()sub
Public Sub UpdateChat()
' MySQL Adapter
Dim MySQLAdapter As New MySqlDataAdapter
[Code]....
Now it gives me there error that a connection is allready open with the Datareader (I havea timer running this sub once in a while).
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Dec 7, 2009
how to make an application with a multiple user.
language: VB
resource: Visual Studio 2008 Pro(90-day trial)
Sql express (the packages when u download the VS 2008)
scenario: i will make database located in a server (LAN) and a multiple client that can access the server database to add,modify,delete records.Im not aware that building a multi-user application database is different from a normal one user application database. T_T.i read some guide and other walkthrough on building a database but it became confusing when it doesnt my requirements. coz when i try to open my database(.mdf) to connect from other client (in another station) it says its currently in use and connot connect to it. err. @_@..
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Feb 24, 2010
i'm trying to make an application using ms access database. This application is for our class, simply to enter students data and institutions details. However, i got stuck with combo; here is my question and the application background?
I have a database named "StudentData" with table "StudentDetails" with "RECNO" which is Auto Numbered (and is Primary key) and a number of different fields which accepts Students Name, class, accedemic year and so on.
What i want to do with the RECNO is, i want to make a combobox which will be filled with the record number of the students, when i click on any number from the dropdown list, i want the other fields like the txtName (for students name), txtClass, txtACYear etc to be field with each RECNO they belonged to.
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Sep 21, 2011
I want to make a login for my application, not using a database, for now.
I figured something like this:
Private Sub OK_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles OK.Click
If UsernameTextBox.Text = "Josh" & PasswordTextBox.Text = "mypass1" Then
[Code].....
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Dec 23, 2011
I already know how to call insert, update, delete & select procedures in DataSet.xsd window. And I also know how to call queries by table adapters. But I just found out that its not possible to call all functions by queries (such as insert). It works when I test the query but when I try to add it, it says "Failed to get schema for this query". So I built a few stored procedures which do many functions (such as transaction, insert, update etc...). But I am unable to use these stored procedures in VB form. I found some tutorials mentioning that it can be done by defining connections and some other stuffs with which I don't want this to be. I want to call these procedures by writing code in VB code editor window with DataSets, TableAdapters, BindingSource etc...
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Jun 9, 2011
The problem has been simplified for the purpose of clarity. I want to make a windows form application that uses an access database. The application will store the list of person's basic details such as name, age and country. The database contains two related tables ie person(id, name, age, country_id) and country(id, country_name) My windows form contains TextBox, DateTimePicker, ComboBox for Name, Age and Country respectively. Now I want to make CRUD operation Programmatically (Not using Visual tools) in the same form with some navigation buttons.
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Sep 18, 2009
I am doing a project on window application but the problem is that I want to connect the connection of database to the SQL Server database. Does anyone knows the connection strings of the connection.
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Apr 20, 2010
This program is very difficult for me, but I must get threw it or I cannot finish... What I am doing is making a Database of foreign Languages with the spelling of the words and the pronounciation inside the database... The USER enters a paragraph of words into the translator textbox and pushed translate. The program has a DATABANK of words with the phonetic spellings and matches the word, then translates to phonetics. The problem is that new words keep appearing inside the language. So I incorporated a Database of 2 fields
[Code]...
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May 1, 2012
1. First off, how do I make my path to my database relative? The path is currently absolute and is: Data Source=J:/College/AS_DSFinalDatabase1.accdb
2. Second of all, where do I save my database in the project? I want it to be included in like project folders...kind of like the App_Data folder in ASP.Net.
3. I'm recieving an error whenever I try to populate more than 1 DataGridView upon form load for some reason...I've tried 5 different ways of writing the code, and I get the same error...there's no error description, so does anyone know what the issue is? Here's the error:
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Jan 20, 2011
In vb.net I am using password protected database with following connection stringconnetionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:vaivaiDB.mdb;JetOLEDB:Database Password=secret;"Database access works fine on the development machine.
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Jul 20, 2011
When I install my application, some forms are unable to connect to the database.
I say some because, when my login form works totally fine. Authentication happens.
But once I go into the main application, and open other windows, I start to get these error mesages:
[URL]
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Aug 25, 2010
I can edit the values in the dgv cells manually, add rows, delete rows all without problem and then update the database.My problem is in one form where I want to allow the user to filter the rows in the grid and then enter a value in a textbox and programmatically update all the cells in one column with that valueI can update the rows, and see the changes in the datagridview. When I try and update the database (using UpdateQuery on the underlying TableAdapter of the datagird) only some of thechanged rows are being updated I though it might be related
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Sep 22, 2009
I am having two databases for the same application , one in windows and the other is web based.Since web based one have few functionalities I can't opt for a single database.At the same time I want to share Both databases to be updated with other's data so as to work error free with my module of appointment fixing.
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Mar 29, 2009
How do i programmatically execute a SQL statement using datasets?
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Oct 31, 2009
I have made a database application that uploads a database via FTP here is the code:
Code:
note this line:
Code:
ContactDB.mdf is the database in my application what would i have to insert for it to upload the database i have tried it as it is and its failing i could locate its full path on my machine that works but what happens when i want the application to go on someone elses pc?
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Jul 27, 2011
I am using microsoft access 2003 and visualbasic.net. I am trying desperately to add a database using the wizard, and it lets me go through with it, testing the connection is good, but when I try to finish it gives me an error: "<customers>Could not retrieve schema information for table or view customers." What am I doing wrong? I've added databases in the past without this problem using the same Access.
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Sep 16, 2009
I stored rtf format directly into the database. Like in database
[Code]...
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Aug 28, 2011
I have tried following code to retrieve image from my database.
Dim sEmpID As String
sEmpID = TxtPisno.Text
If sEmpID.Trim = "" Then
Exit Sub
[Code]...
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Jan 31, 2011
i have a project that can store a different files (.txt,.doc,.pdf,.jpg) in database (.mdf or sql server 2005)
but my only problem is when i view a data from the database there have a error..
the error is "the multi-part identifier ".doc" could not be bound"
this my codes.
'Get table rows from sql server to be displayed in Datagrid.
Private Sub GetImagesFromDatabase()
Try
[Code]....
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