I am trying to get information into a database from VB 2008. I have an established connection and have pulled fields onto my form. I am able to see data already in the database on the form. Originally, I tried to use an Update button to send the data from the dataset to the database. This did not work. I then added a Save button to the Navigator on my form in hopes this would do it. This too, failed.
View 10 RepliesIv created a Stock Market program and i need it to automatically download the new prices from the web on a daily basis.
It will be downloading the info from my own website - what server software should i use to manage this - simple machines forum ?? A mysql db will be on the server - how is it best way to get this whole system working ?
Having problem in updating an existing record. An error occurs "Data Type Mismatch in Criteria Expression"
Private Sub ToolStripButton1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ToolStripButton1.Click
Dim myBuilder As OleDb.OleDbCommandBuilder = New OleDb.OleDbCommandBuilder(dataAdapter)
[code].....
I am trying to make changes to parts of an Access table but can not get the database values to change.I am able to get the datasets and things in VS to change, but the database never shows the changes.
I Have:
' Create an instance for the payrolltable
Dim dt As New MsPeachDataSet.PayrollDataTable
[code]......
i m having problem while updating my database... In this code when i delete records then it will deleted but it can't show updated data..for viewing new updated data i hav to again open the form ... so is there any code which i miss??? to update database @ runtime??
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i'm just starting with sqlite, as apparently its quicker than access for a real time logger. i'm using this as a tutorial - i didn't install the runtime support with SQLite as it causes issues when using 2008 express.[URL]..
but it seems the data isn't being written to to the db. i can't tell exactly because i dont have a program to view the table contents, only to view the setup of the db.
I am working on a project that stores data on animals. I am trying to make updates to data already stored there, through inputs on a VB form. A form where all the data is populating the fields shows up and the user can change/update any field. Once they are finished, they click update and the DB is supposed to reflect those changes (Theoretically)However, I wrote the code to do that, but when it runs nothing in the database is changed and nothing gets done, as it seems. No errors appear and nothing goes wrong with the program. It just doesnt change the data in the db.
View 1 RepliesI am working on a project that stores data on animals. I am trying to make updates to data already stored there, through inputs on a VB form. A form where all the data is populating the fields shows up and the user can change/update any field. Once they are finished, they click update and the DB is supposed to reflect those changes (Theoretically)
However, I wrote the code to do that, but when it runs nothing in the database is changed and nothing gets done, as it seems. No errors appear and nothing goes wrong with the program. It just doesnt change the data in the db.
Here is the code updating the database.
If txtNewID.Text = "" Or cmbRegion.Text = "" Or txtWombatName.Text = "" Or cmbGender.Text = "" Or txtAge.Text = "" Or txtWeight.Text = "" Or txtLength.Text = "" Or txtCommunity.Text = "" Or txtDescription.Text = "" Then
MsgBox("Please fill in all required fields.", , "ERROR")
Else
[code]....
I have two forms in my program, Form1 has ListBox which contains names from the Database.Form2, has textbox and add button to get a new name from the user.but when I click on add button.. i return to Form1 to view the names in the listbox by clicking on view button: ALL NAMES ARE DISPLAYED WITHOUT THE NEW NAME.when I close my program and click on View button all names including the new name that was entered before are displayed ! is there a way to display everything in the database without closing the program??I need a way to refresh or something.
Form1:
Imports System.Data.OleDb
Public Class Form1
Dim ds As New DataSet()
[code]....
I have spent several hours trying to delete a row and insert a row into an Access database using the OLEDBDataadapter and dataSets without any success. I don't get any errors it just doesn't update the datatable. Here is the last version of the code I have been trying to get to work. I have done a lot of searching and have
Data save
Private Sub SaveNumDte(ByVal ltoNum As String, ByVal ltoDate As Date)
Dim numTotal, x, MaxRows As Integer
[code].....
I have a datagrid view that displays information from a table. Changes I make to the data grid view are not saved. I have a button called btnsave but I have no idea what to put in the click event to save changes to the DB.
vb
Dim ConnStr As String = String.Format("Provider=Microsoft.Jet.OLEDB.4.0;Data Source={0}", DataDir)
Dim conn As New OleDb.OleDbConnection(ConnStr)
Dim sql As New OleDb.OleDbCommand("Select * FROM USERS")
Dim dt As New DataTable
[Code] .....
I'm having trouble updating my access database using DataGridView1 on my form. I created a DataGridView on my form linking it to an access database data source. At run time, the DataGridView shows the content of my access database. When I edit the database data in DataGridView, it looks like the database is being updated but when I close the form and reopen, the database is not updated. Do I have to write code and assign it to a button to update the access database? Is there a way to update the database once a new value is entered in the DataGridView? Am I missing a setting that does this automatically?
View 15 RepliesI have a small program with Members table and for subscription. The table has a joindate, expirationdate, status and gracedate collumns. When I run my program n click on a button I want the program to update the STATUS text by checking expirationdate column if is greate or equals to todays date then Set it to Expire.[code]Here is the error message I get on runtime: Syntax error in string in query expression 'Expirationdate <= '26 July 2011'.All I need is to change the status text into Expire if expirationdate <= todays date.
View 1 RepliesIs it safe to update an SQL database from multiple threads at the same time? I have a method which runs on up to 25 thread pool threads at the same time and it attempts to write to a text file and update an SQL database - I assumed that writing to the file would not work properly if all threads tried to write to it at the same time, so I have used SyncLock for that part of the method. Just wondering if I need to do the same thing for the part of the method that updates the SQL database? or is the framework (or SQL server) smart enough to either execute multiple update statements on the same table at the same time without a problem or queue them?
View 5 RepliesI have been trying desperately to update a data base file (Microsoft Access file) through a DataGridView control. The form is very simple, containing only a button and the DataGridView control. Whenever I change anything on the DataGridView control and press the Update button, I get an error saying ""No value given for one or more parameters". Below there's a picture showing both my form and the whole code , along with the error message. In case it is not possible to update a data base file through a DataGridView control.
View 3 RepliesHere is my
cn = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=BHgardeners11.mdb;")
cn.Open()
Try
str = "UPDATE Products SET ProductCode = ?, ProductManufacturerCode = ?, ProductsTitle = ?,
[Code] .....
If there is only one item in the database, then this code works. If there is more than one record then the error is produced that it is trying to produce duplicate values. This is down to the Primary key in my database which is the only thing that cannot have duplicate values. However, when I remove the primary key it has the predictable problem that it goes crazy and does weird things.
i need some function like adodb.recordset on vb6.0 on vb.net but seem i cant manipulate it like recordset because i want to manipulate in retrieving,inserting and updating my record on just only how call on the database im using mysql database..
View 4 RepliesI have an access table that I'm loading into a dataset, then I'm binding the dataset to a bindingsource. The bindingsource is the datasource for a datagridview. I can use a command builder to update the entire table, but I need to update all the rows (or changed rows) in specific columns. I have a column called "dPrint" which is Boolean. I'm not sure how to use the bindingsource as my datasource in an Update Command. I've tried this:
View 8 RepliesOnly my local dataset updates when adding, deleting or editing records.The Source Database is supposed to update on issuing DataAdapter. Update(dataset )However, when I check my source database after running the operations it remains the same as the original.
View 6 RepliesI have the following update statement to save data to an access 2007 DB:
[Code]....
There is something wrong with my codes. I don't know why it isn't updating the records.If I activated the line dt.Rows.Add(newrow) it will just create an error on da.update(dt) line QuoteThe changes you requested to the table were not successful because they would create duplicate values in the index, primary key, or relationship. Change the data in the field or fields that contain duplicate data, remove the index, or redefine the index to permit duplicate entries and try again.But if I deactivate that line, no errors will be occurred but the record won't update.
Here is my code
Dim dt As New DataTable
Dim ds As New DataSet
ds.Tables.Add(dt)
Dim da As New OleDbDataAdapter
[code]....
Whenever I try to update a row in my database, it works, but as soon as I restart the application, the changed information resets.[code]....
View 10 RepliesI have the following sql query that on debugging contains what looks like the right thing however the database is not being updated, but the code runs fine:
con.Open()
For i = 8 To ds.Tables("AddressBook").Columns.Count - 1 'Counts the amount of columns in the database
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i am haveing problems updateing my customer details i was wondering if i could use the code i have for add and change it to update maby insted of useing the INSERT I could use a UPDATE or something anyway
Public Sub updateWithNewOrders(ByVal aOrder As Order)
Dim cmd4 As New OleDbCommand("INSERT INTO ORDER
(OrderID,CustomerID,OrderTotal,ODate,EmployeeId) VALUES (?, ?,?,?,?)", con)
[Code].....
I have an field which i have to update based on the selection of listbox.When i select listbox based on that when i update my fiels it should be updated
Dim cnstring As String
cnString = "Provider=Microsoft.Jet.OLEDB.4.0;Persist Security Info=False;Data Source=AirLine.mdb"
Dim sqlQ As String = "SELECT NoofCoachseatsAvailable,NoofCoachSeatssold FROM FlightDetails WHERE flightname='" & s & "' "
'Create connection
[Code]...
Dynamic SQL generation for the UpdateCommand is not supported against a SelectCommand that does not return any key column information. Is my selection (Based on Listbox selection) is the wrong part here.
the problem is when I click the 'save button' and then exit. Then open again, the total records still unchanged
the code used
Private Sub btnSave_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSave.Click
Validate()
Supplier_s_informationBindingSource.EndEdit()
Supplier_s_informationTableAdapter.Update(Bookster_databaseDataSet1._Supplier_s_information)
End Sub
then I try to put Me.
Private Sub btnSave_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSave.Click
Validate()
Supplier_s_informationBindingSource.EndEdit()
Me.Supplier_s_informationTableAdapter.Update(Me.Bookster_databaseDataSet1._Supplier_s_information)
End Sub
I don't know if make a difference but how to update the database also, what code should I put?
i have published my website...its a dynamic site..so i have database connectivity..now i want to make an application in VB to update my database using my application..i mean i do not want to login to the site and update my database rather update it using my application..i want to connect my application to the database of the published site and update it from anywhere i want using the application...is it possible??
How can i do it??Please point me to the right direction...its urgent.
I've seen similar problems posted on this and other boards, typically with a bunch of code checking before its realised that that database itself is being copied to another directory and run from there. Apparently this is managed via the database properties, copy to output directory settings. In my case I have tried all three options, with no change in result. After "saving", inspection of the actual database via the server explorer shows no changes have actually been committed.
I am getting to a point where I need to start entering large amounts of data into the app and have at actually save to the db for deeper testing.
I noticed this behavious first when using an .accdb and it has persisted through my exploration of SQL(.mdf)
db Output Option Selected / Result
always copy... data changes do not persist between debug runs and is not entered into actual database
copy if newer... data changes do persist between debug runs but is not entered into actual database (checked via server explorer)
Do Not Copy... generates the below Error on execution
System.Data.SqlClient.SqlException was unhandled
Message=An attempt to attach an auto-named database for file C:UsersXXXDesktopVisual Basic ProjectsSQLtestWindowsApplication4 - CopyWindowsApplication4inDebugMyDatabase.mdf failed. A database with the same name exists, or specified file cannot be opened, or it is located on UNC share.
I am a newbee to the programming. So please guide me if i am wrong. up to binding of the datasource my programe working perfect but during save button it gives error.(Value can not be null. Parameter name : daatTable)
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I'm having a database, using GridView I retrieve the data into my WEB application.Then I set the rows to editable (not sure if it is fully completed) and when I edit some cells I want to update the GridView AND the database behind.When I click on 'edit' then the button is changed to update. I get some unhandled exception. I don't expect anything else since I didn't put any code in the update methods like RowCommand, RowUpdating, RowUpdated, RowDataBound.
View 4 Replies