My application pulls data from a one column MS Access table. The column name is "Timer", and in Access the values are stored as text. In my application the DataTable stores the values as Timespan. Since the strings are of the format "01:22:15", there is no problem parsing the strings to Timespan when filling the DataTable When I am done working with the data, I want to update the Access DB, so I call dtAdapter.Adapter.Update(dt). This is when I run into trouble. As the application tries to update the database, I receive these errors:
"A system.InvalidCastException was thrown: Object must implement IConvertible""Failed to convert Parameter value from a Timespan to a String"
How do I instruct the TableAdapter to convert my Timespan values in the "Timer" column to strings before storing it in the database?
I'm using a 3rd party chart COM object (National Instruments CW graph) to plot data versus elapsed time.The x value needs to be a VB6 equivalent Date type which is a .NET DateTime datatype.What I need is a way to convert a TimeSpan datatype to a DateTime datatype.
Dim testTime as System.DateTime 'date Dim plotTime as System.DateTime 'date Dim elapsedTime as System.TimeSpan[code].....
I need to get information from two tables onto my form. I'm using a DataGrid called SQLGrid which I'm populating in code with the information I need to get out of both tables.
I need my application to be able to update the DataGrid, and commit those updates to the database. My problem is that all the research I've done so far has led me to believe that there's no way I can do this because the SqlDataAdapter.Update() method only updates 1 single table.I just had an idea to make my event handler execute a stored procedure that creates a view on the database, populates it with data from my dataset, and then distributes the information between the two tables where needed.I guess another solution would be to use 2 DataGrids and then tie each of them into a seperate DataAdapter/DataSet, and then update each when the Event is called. The problem here would be that it's more work for the end user to make changes, so I'd really prefer to do it another way.
I'm new to vb.net and its database methods so I'm a bit confused by these datasets and grids and table adapters.
I'm getting:Concurrency violation: the UpdateCommand affected 0 of the expected 1 records.
On this line:frmMain.AccountsTableAdapter.Update(frmMain.DsAccounts)
I have a datagridview attached to a dataset. I also have a button that the user can press to update information in the datagrid based on a website. But I often get that error when it comes to actually updating the table.
(VSE 2010, .NET 4.0)I am attempting to fill a DataTable with columns of numbers from a CSV to create lines on a third party chart control called Zedgraph. The problem is, the control keeps plotting one-to-one lines of point counts (in other words, if the column has 400 points, it plots a straight line from 0,0 to 400,400). I believe it is doing this because the data in my table is still being input as type String, which it shouldn't given the Cdbl(Var(x)) function I have written in. Why do you think my table values are still of type String?
Imports ZedGraph Public Class Form1 Private Sub CreateDataset(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Dim DataSet As New DataSet
anything wrong with using datatype object and determine datatype in class property? I have a typed dataset and it has several integers columns that are null in the db. and when I make a call it throws exception.is there anythign wrong with setting it as object in my dataset.. changing the throw exception property to Nothing and passing it to my property as integer?
for each row in myDS.DataTable cRate.CustID = row.CustID next row
and in my class
Public Property CustID() As Integer Get Return _custID[code].............
I have a database in mysql. The column in table is of datatype time(0)
Similarly I have a control datetimepicker in vb.net I have assigned format property as custom to the control and the CustomFormat property as HH:mm:ss tt so that it can just provide the time. I dont want the date to be in it.
Issue comes when I try to retrieve the value from database I get an error as Converion of type 'Timespan' to type 'Date' is not valid
Try Dim myCommand As SqlCommand myCommand = New SqlCommand("select * from [HMS].[dbo].[DoctorSchedule] where DoctorID='" & txtDoctorID.Text & "'", Connection)
I am working on a produce inventory database in my VB Express program.I have a form on the bottom and a spreadsheet at the top. I want to enter all the data in the form and have that data automatically transferred as a group to the spreadshet in the upper part of the page when I press a button.I know that there's an insert function.I set it up correctly. The problem is that I have to convert the textbox, which contain string data, to the datatype used in the database spreadsheet.HOw do I use CAST or do this?Here's the function I am using:
Evernything is a string cause the data is coming from a textbox, I need to convert it to the datatypes used in the database.Also how do I use the CAST and Convert functions
I have a webpage with a form that is used to edit some object. This object contains a Collection of other objects defined like this: Public Overridable Property Employees As List(Of Employee)
On a form I can delete an employee, add a new one or modify existing one. When I click save new values are sent to the server. On a server I check if the user exists. If exists then I modify its values, if it does not exist then I add it. All employees that exist on the server and were not sent are marked as deleted (State changed to EntityState.Deleted). I try to use the following code (dbCollection = database entities, newCollection = collection sent from the form):
[Code]...
This code does not work, because changing to EntityState.Deleted removes the object from collection, and for each loop breaks, since the collection is modified...I know that I can overcome this problem by using a for loop or adding objects to delete to some other list first, but I hope maybe there is a pattern that would make my code nicer.
I have to work in two parallel environments, developement and production, I want to use the same TableAdapter to connect to different databases (two Oracle databases running on different servers) with the very same structure. How is this possible?
I'm using TableAdapters in VB.NET (VS2008) to an SQLCE DB. These are associated with a range of DataTables in my DataSet.
I'm trying to simplify my app and I'm wondering : If I call the Update method of a table adapter and there have been no changes, then will the TableAdapter still open the underlying database, or is it smart enough not to bother?
At present I'm using simple boolean flags to keep track of which DataTables have modified data - and it works fine - but I'm just thinking I might be able to simplify my code just by always letting it call the updates. But I only want to do if it won't add an overhead.
I have a form that has a datagrid thats being filled by data from a temporary database (called Scratchpad3) and what I'm needing to do is to update another table that's not part being called with my table adapter. My table adapter looks as follows:
I have a VB windows Form project that connects to several DataTables in an Access DB. On my form I have several textboxes, comboboxes and datetimepickers that are bound to those sources. With one table in particular when I try to update the tableadapter after editing one of the textboxes the update method fails. No exceptions are thrown, but the update method returns a zero value and the data is not updated. The update will work when just the comboboxes or datetimepickers are edited, but as soon as a textbox is edited also, update will not work.
Other DataTables within the project are set up in the same manner but are not having update issues. I can't figure out what about this one particular table is causing an issue. Can anyone give me any thoughts on where or what to troubleshoot?
I have a DataGridView on my form and I'm wanting to override the 'Add New Record' button on the DataGridView controls, and display my own 'Add record' form. The problem is, when I do so, I no longer get the Auto-increment functionality of my primary key field (as i would If i used the default functionality of that particular button).
Would I be right in saying that when using tableadapters that you can't get the identity value back from the tableadapter when you insert a row intot a datatable then save the table back to database using tableadapter.update(datatable).It will only return the value of 1?
I would like to return the identity from the table but didn't want to have to assign all the parameters manually in code cause theres about 30
I would like to start a data base. Im using vb2005. I've started a new windows application. I have added a new data source to the project. Then I added a new TableAdapter in the dataSet.xsd part of the project. When I'm completeting the wizard, when I click on the QueryBuilder, when the add table window opens, the table already in the program ( that comes along with the TableAdapter ) isn't recognized. I've clicked on the refresh button but it still isn't recognized. (example: DataTable1 isn't recognized in the add table form in the query biulder of DataTable1TableAdapter)
I have code that saves changes to data on a form and it works fine. I then used the same code on a different form (only changing the name of the bindingsource and tableadapter), but changes I make to the data don't save. Why will it work on one form, yet not on another? Here is the code I am using to save the data on the form that works:
Dim deletedRecords As DataDataSet.CatalogDataTable = CType(DataDataSet.Catalog.GetChanges(Data.DataRowState.Deleted), DataDataSet.CatalogDataTable) Dim newRecords As DataDataSet.CatalogDataTable = CType(DataDataSet.Catalog.GetChanges(Data.DataRowState.Added),
[code]....
The only difference I see is that on the second form (the one that won't save) I have other tableadapters loaded. But they are just used to load data into different comboboxes. What could be causing the second form not to update the tableadapter? I'm not talking about running the application, making a change, then closing the application and it not saving. I realize that a second database is created because I've set the Copy to Output Directory property to Copy if Newer. I can tell it doesn't save because I run the application, open the form, make a change, close the form, then open the form again. The change I just made is gone.
I have a program that is using a dataset class, table adapter, binding source and binding navigator. The program can read, update, and delete rows from the table. However, it doesn't recognize new records and save them to the database when the table adapter's update method is called. (table was pre-populated by another process) The database table is using an identity column for the primary key. On a whim I added code to force an insert of data using the table adapter's Insert method with some hard coded values and this worked.This code was invoked after hitting new record on the binding navigator bar. Looking at the database, I notice the record I forced in skipped an identity value, which indicates to me hitting new record took the previous number. So the question I have is what would keep the tableadapter from inserting the new record when its update method is called?
Which does not match the query, either in name or order of parameter types.How can this happen? Any fixes? It also throws back errors at runtime for type mismatches, which don't occur when the parameters are in the 'correct order' in the query builder.
I´m trying to update the database i´ve already have de data set BDHERGAIMDataSet with all my tables(tbboletines is one of them) i add a new row, and set the values of each column of the row in the table and then try to update the database.It doesn´t give me any errors when I run it but it doesn´t write nothing on the database table....
Dim newvobol As BDHERGAIMDataSet.tbboletinesRow newvobol =Me.BDHERGAIMDataSet.tbboletines.NewtbboletinesRow newvobol.idnaturaleza = 1
In VS STUDIO 2008 I have made a datagrid , where i have set yes too edith, new and delete.this works fine, but now i need some code in form closing to Update my tableadapter to the value from my datagrid
Yes i know there are many Question about this i have read and read this answers but i Can't fine out how to make yhis to work
I have a query in a myTableAdapter that ends with WHERE column IN (@S). This works fine when I use myTableAdapter.Fill(dataset.table, "text") but I can't find any way that works to provide multiple text strings such as "text1, text2" for the IN parameter.
Private Sub btnSaveChanges_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSaveChanges.Click Me.EmployeeBindingSource1.EndEdit()
I have a form with a tableadapter I want to perform operations on records of the same table just in code so i defined a copy of the table adapter in the dataset designer named tableadapter1 The problem is that when i try to fill tableadapter1 i get the error Error3Value of type 'Deudoresnet.DeudoresDataSet.tablename1DataTable' cannot be converted to 'Deudoresnet.DeudoresDataSet.tablenameDataTable'.
Isnt ther in the dataset two table definitons?How you relate each with the correct tableadapter?
In the tableadapter manager the original table is related to tableadapter but table1 is related to (none) and i cant set it to tableadapter1
