.Net 2010 To Access 2010 DataSet Primary Key?
Jan 17, 2011
I am using Access 2010 and VB in VS2010.I have created a DB and have several tables. 1 table in particular called Employers, has the normal AutoNumber Primary key. Everything in Access runs fine. I used Access to develop a basic model application of the full version I am developing in VS.My VB front end contains a dataset linked to the employers table. I have dragged onto my form the "detail" view of this DataSet, not the DataGridView. The usual controls are in place such as the EmployerBindingSource, EmployerTableAdapter, TableAdapterManager and a EmployerBindingSourceBindingNavigator.On my VB form Scrolling through the record set is fine and all works well.My problem is after I click the "Add" record button on the EmployerBindingSourceBindingNavigator. The form fields go blank as expected awaiting user input. However, the field that is bound to the employer_id field (the Employer table's primary key) shows a value of -1.The insert command works no problem, and having looked at the database the table contains the new record with a correctly incremented PK
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Jan 23, 2011
I have created my own object, wich contains a SerialPort. I have a sub in my object wich handles the .DataRecieved-event. I'm trying to access my DataSet from that sub, but for some reason I'm unable to do that. It keeps telling me that my tables contains 0 rows, but I'm 100% sure that they contains several rows.
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Sep 12, 2010
Here is my problem:
For example, I have 4 existing records
UserNo - UserName - Password
1 - ABC - 1234
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May 20, 2011
Is there a way to modify the text of a primary key and not have it delete all the following rows in other tables related to it?
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May 26, 2011
I defined a database using SQL Server 2008 R2 Express, and connected to it using Visual Basic 2010 Express. For some reason though, when I use the database in the program, it wants to start off using a negative primary key.Is there any way to make the primary key only a positive number?
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Apr 21, 2010
I have some VB.net code that inserts data into my SQL database using a typed dataset as follows:
dim usersTa As New authorizedUsersTableAdapters.Authorized_UsersTableAdapter
usersTa.Connection = New Data.SqlClient.SqlConnection(MY_CONNECTION_STRING)
usersTa.Insert(first_name, last_name)
[code]......
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Jul 16, 2011
it's just for a program registration. i would store all of the registration codes in the access database, then export it to XML, then upload it to my web host. I would then somehow connect it to my Visual Basics login form (Which I have already made). If this can't be done, having them register through the form and having all the allowed codes on the internet (So i can easily edit them)!
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Apr 1, 2012
Syntax error (missing operator) in query expression '''system time'''.this is the error that appears
this is my code:
Dim sqlCmd As String
Dim x As Date
x = Format(Now(), "General Date")
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the fields in the tables are all text fields.is there any way to fix this error? perhaps it is in my query but i really cant find a solution.is there an alternative to get what i want my program to do?it is basically entering an ID number and finding the record with the same idnumber and putting the system time on the timein field for that record.
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Sep 17, 2011
I programmed an app with an Access 2010 database, I installed the app and the database on a computer with office 2007. The app can't open the database. Do I need to copy some extra file on the user's PC?
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Mar 9, 2010
Where is httpUtility.UrlEncode in 2010?? From what I read in the forum I need to add a ref to System.Web. But I only see references to System.Web.Application.Services and System.Web.Services, which don't resolve the problem.
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Mar 2, 2011
I'm trying to create an application using VB 2010 and an MS Access 2007 database. I've been googling around but was unable to find something focused on this matter.
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Apr 27, 2011
In my application, users can establish connections to one or more databases in order to pull in data, thus a read-only connection is sufficient. I use the following connection string syntax when connecting to an Excel 2010 database:
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Apr 8, 2010
I've been working on an app for quite awhile and now am at the point where I have to incorporate an Access DB. Tried many things/variations of what I've found...but now am stuck. So here goes:
I have a Form with this
Public Class Form1
Dim objConnection As New OleDbConnection _
("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=|DataDirectory|Test.mdb")
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Aug 20, 2011
I reproduced the following code to update a database and I get the error" Operation must use a updateable query"
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May 28, 2012
I was trying to establish a database connection to MS Access but this error keep occurring.
The 'Microsoft.Jet.OLEDB.12.0' provider is not registered on the local machine. I have forcefully set my cpu to x86 but still no lock below is the code how I open it.
Imports System
Imports System.Data
Imports System.Data.OleDb
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Apr 20, 2010
get data from xml and onto datatables within a dataset or if there is a simpler way i have completely overlooked.
1/ setup a dataset and add tables with columns ready for data
2/ setup various classes so i can construct a list (or array) of a specific type
3/ get the xml into an XElement type.
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Now i am wondering if i can say for the type in step 2/ use DataRow as the type thus missing out step 5/ ? is this possible? what other ways are there to get xml into a DataSet? One other method that occurs to me is to load the xml directly into the datatable (this is possible?) but i am not sure what the xml needs to look like for that to work. My xml is simple it contains only values and no parameters if that helps...
I require my final dgv to be sortable by column clicks etc so needs to comply to various interfaces, any pointers on this (perhaps i can avoid using a dataset and populate direct from my DataObjects so i only need steps 2, 3, 4, 5 and 7?)
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Jun 10, 2010
i am trying to read csv to dataset and display the results in grid which it working fine. But i want to use the values. I know its a dumb question but gotta start somewhere
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I can see these in dataset just fine but in just one column. So i know i have to use split with "," but i cant seems to find the right syntax... here's the code below..
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Nov 22, 2009
just wondering if what i've been doing for the last few months is the best method to get data from xml and onto datatables within a dataset or if there is a simpler way i have completely overlooked. Rather than go into the code i will explain the process step by step.1/ setup a dataset and add tables with columns ready for data2/ setup various classes so i can construct a list (or array) of a specific type3/ get the xml into an XElement type.4/ use LINQ to obtain a query from the xml5/ use this query to create lines of the t
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Jun 27, 2011
I am working on a program that uses an SQL database which in terms has a dataset .xsd which im using. I need to be able to update my dataset so it can reflect any changes made during run time. I am using the internal data binding that vb uses so I am not doing anything manually.
I fill a table adapter with information from the dataset and table with this snippet of code:
Me.biweeklyTableAdapter.Fill(Me.DDSPayRollDataSet.biweekly, biwk.valpay)
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Apr 13, 2012
I am working on a database application. I had used Dataset to link my VB programme to a database and selected specific tables. However, I created more tables in the database and I wanted to add the new tables to the dataset. I could not find a simple way to do this, so I deleted the existing dataset and created a new one. This move has broken my VB codes. I can no longer run them as errors are shooting up. In fact, I connot view the forms in my programme anymore. I have a backup of the codes to rerun, but then I need to add new tables to the dataset.
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May 26, 2011
I am having a problem adding a row to a dataset.HTML
Private Sub BtnAddNew_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnAddNew.Click
nrow = ds.Tables("addressbook").NewRow()
nrow.Item(1) = txtFirstName.Text
nrow.Item(2) = txtSurName.Text
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Dec 21, 2011
i have a strongly typed DataSet that haves these two tables:
AUTHORS
ID
Name
and
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Somewhere my system haves a function that returns a DataSet with the books of a certain subject and all the Authors that wrote such books.I need to show the book's attributes in some textboxes inside a Form. I use a BindingSource to display the ISBN, Name and Subject of the books in a textbox, yet I don't know how to display the author name of the book I am currently viewing in a TextBox, taking into account I already fetched the Author into the DataSet.
Its pretty much the Child/Parent display problem somewhere discussed in the codebank, but kinda backwards, the thing is that I;m navigating through the CHILD records here, not the parent, yet i have all the data needed in my Dataset.
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Aug 11, 2010
I have to change an application I was made, but I have a big trouble.In this application, I use a SqlServerCE file, as database.But now, I need access the database from another PC.
I will made this:
- Create a XML file, with the location of my .SDF file
- The connection string, form making SQL commands is easy adjustable.
- The problem is: And how can I change the dataset automatically created form the VB? use it many times, in many forms, and in the application load, I have to read the XML file, and update this dataset.
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Oct 12, 2011
VS 2010 Saving Dataset
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Dec 13, 2011
I am in a bit of a sticky situation. I am currently writing a program where users are going to have to search for a specific skill in order for a calculation to take place.I have to hard-code around 500 skills but they also have to be able to search for the skill via a text box.I am stuck on whether or not to use an XML file to hold all this data or use a DataSet.I have no experience with either, but the XML file seems more appealing because I wouldn't then have to re-release the program for an update on skills, only the XML file would need to be replaced.
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Mar 15, 2012
I have a VB.net application that has three project in it. Two of the project are DLL with references in the primary project. I have a public Model "RegSaveGet" in the primary project listed below. When I look for the namespace for the module from one of the DLL projects I can not see it. I want to use this module from the two DLL projects. I can only see it from the primary project.
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Feb 21, 2011
I want to check in an Access Database if a primary key exists using VB.Net & OleDb:
By primary key name
By number of fields as primary keys
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Feb 8, 2010
I have a database program, and the first row of the table i'm inserting into is a primary key, just a number that increments by one each row. This is my SQL statement,
SQL = "INSERT INTO Squad VALUES('" & (NUMBER) & "','" & txtfirstname.Text & "','" & txtsurname.Text & "','" & txtdob.Text & "','" & cbxposition.SelectedItem & "','" & lblhiddenid.Text & "')"
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Apr 29, 2009
I am in the process of creating a system using VB in Microsoft Visual Studio 2008. The system which I am creating is connected to an Access database via a tableadapter.Currently, I am coding a form for a table called Employee and this form allows the user to create a new employee, edit or delete an existing employee. Editing and deleting an existing employee works fine but adding a new employee is causing me trouble. When I specify an employeeID (this is the primary key), the declared value is stored appropriately in memory and it also displays in the form, however once I save the new employee to the database, the employeeID always defaults to 0 for some unknown reason. So, the record which I've just entered has a primary key of 0 regardless of what the the primary key should be.
The employeeID is declared as an integer and the value is obtained by getting the employeeID of the last record in the table and adding 1 onto it. I've also tried hard coding the employeeID and a specific number, but this does not make any diffence. I've reused the code from another part of the system which works fine before, but why it suddenly doesn't work is baffling me. The employeeID field in Access is a long integer.
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Jan 21, 2009
I'm using vb2005express for forms (front-end) and ms access database. I have a form with a master-detail setup. The problem I'm having is that when I set the primary key column to autonumber, I don't get the pk value generated in ms access database into my master datatable in forms when a new record is created. Then I tried setting the AutoIncreament to True in the pk column of the datatable in my dataset (forms). This generates a number in my pk column but its not the number generated in the database (since I think because the pk column is still set to AutoNumber). So I change the field property of my pk to Number in the access database and on my dataset (forms), i still have AutoIncrement to True.
This works okay since what it seems to be doing is getting the max value for the pk column when the datatable is filled upon form load. The problem now is that I normally don't do tableadapter.fill(datatable) at form load since I think there would be a performance issue if record counts around millions. What happens now is that when I create a new record, the pk generated is still 1 which will cause duplicate violation when saving to database. I'm not quite familiar with access features but in oracle, what I do is I create a sequence in database then I create a function that gets the next value of the sequence. Then at form load I set the datatable.column.default_value = get_sequence. How do I do this in ms access?
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