I am writing a program that has a listbox which is bound to a dataset. When I click a button (e.g. delete) the item is deleted from the database ok using an SQL query but is still shown in the listbox. How do I get the listbox to refresh/update its display?
I've recently been trying to figure out a way to get parameterized queries to work and i think i'm almost there but seem to be getting an error when executing my query
I`m now at the point calling server from vb.net, and run query inside vb.net code.I have write two codes on button click. One button is checked server connection, other should execute query for server table.Connection code is working, as I have set two messages, and getting successfull message. Second code is not working, as nothing happened when press button. Sql statement is very simple, and it works if I run it manually.[code]
Dim dbTRCoreDatabase As New TRCoreDatabase 'Query For Get The Employee ID' Dim listEmployeeID As IQueryable(Of Long) = (From EmpMaster In dbTRCoreDatabase.EmployeeMasters Where EmpMaster.Email = [code]....
I have a string qText with the text of a query in it, say qText = "select * from Data". how can I execute it to fill a TableAdapter I have in my form with the resulting data?
What's wrong with my code, the query seems to be fine, I tried executing it on phpmyadmin.
CODE:
I got this error: ERROR [42000] [MySQL][ODBC 5.1 Driver][mysqld-5.1.36-community-log]You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1
Ok I'm creating a sql query with a string variable and executing it in vb. The string would look something like: Insert Into Table (vara,varb,varc) Values ('vara','varb','varc') This works fine.
I have a problem with a sql query. Through the query I am trying to search database for any occurrences of string (can be anything) in a column using the SQL LIKE command. The problem is that it works fine for most of the strings say john, jim, ji"m , but does not work when i include the following characters which are ( ' , { , } , and a single quotation mark). MYSQL query takes care of these special cases by putting them in [] block whenever user enters them .But i am getting the following error when i go to query the database using the GetSelectCommand() in VB.NET
Exception Details: System.ApplicationException: Number of values provided must be equal to the number of placeholders in query.I have checked the query over and over again .. but its fine .My database server is Sql Server 2008.So my application throws the exception in this command:
Using reader As MustDisposeDataReader = _ pmSystem.DatabaseManager.GetSelectCommand(selectStatementBuilder.ToString(), New Object() {})
Where MustDisposeDataReader is an instance of a class in an internally developed library, which inherits from System.Object. pmSystem is an instance of the class PlanManagerSystem which implements the commandlayer. GetSelectCommand() takes the select command
I have a datagrid which is getting populated by two tables. I want to know how do i perform an update on these tables once the user tries to save any edited data. I am doing the following which i found in one of the articles online: [Code]
If objDataset.HasChanges() Then Dim data_adapter As OleDbDataAdapter Dim command_builder As OleDbCommandBuilder fillSql = "Select [Price Info].[Product Quick Find ID] As
i have 3 tables t1,t2,t3..if i update t1,t2 and t3 must also be updated.i have just been tried
UPDATE t1,t2,t3 SET t1.f1='sample',t2.f1='sample',t3.f1='sample' WHERE t1.f1='test' and t2.f1='test' and t1.f1='test'
using this,update fails if t2 and t3 could not find 'test' in their fields,if i use OR all records will be..i have also tried JOINS
Update tbl_maincat AS m LEFT JOIN tbl_maincat AS m2 ON m.cTitle = m2.cTitle, tbl_main AS c LEFT JOIN tbl_main AS c2 ON c.MainCat = c2.Maincat, tbl_subcat AS s LEFT JOIN tbl_subcat AS s2 ON s.csCat = s2.csCat
I've finally got around to starting windows phone dev. I'm not very good at it yet, but anyway, I hope you guys understand what I want to do here.From what I've learnt from other programmers, an ObservableCollection can be updated in live time whilst it is databound to an object, such as a listbox. All changes to the ObservableCollection will cause the UI of the object it's databound to update it's items.
So what I'm trying to do, is download a file from my server, parse it with json, then update the ObservableCollection with the new data. However, the webclient doesn't seem to be downloading the new data until the app is re opened!
I'm trying to update an access .mdb file. The file contains one table with 115 fields. I have estabished a connection to the database. I'm able to select the datarow I want to update. I can see it when I debug the code. I change two fields in the datarow by using thier index.
I have a working game server browser project in VB.NET 2008 and I'm trying to fix the CS 1.6 and CS-Source query protocols. Where can I go to learn how to query a game server? The code worked in 2004 and now I want to update it [Code]
I am new to VB.net and want to know how I can execute SQL queries from within VB.net code. Example: I want to update some records in a table using SQL query on the Form Load event.
I have a Listbox which is to display a list of product names which it reads from a database table, bound using the inbuild datasource/databinding stuff..however when the product names are updated/more are added in the table etc no change is reflected in the Listbox! only the initial names from when it was first bound appear, how to fix this?
I have been coding an application for a LeaderBoard for a game. I have all the Login sorted using Mysql and even have all the Account infomation displaying in lables etc. for account info form. Now I am trying to UPDATE information and this is how I was trying to do this...
Dim UpdateInfo As New MySqlDataAdapter Dim mycommand As New MySqlCommand() Dim mydata As MySqlDataReader Dim query = "UPDATE Login SET Pword = '" + UpdateTxtBox.Text + "' WHERE Uname = " + Login.Uname mycommand.Connection = conn mycommand.CommandText = query UpdateInfo.SelectCommand = mycommand mydata = mycommand.ExecuteReader()
But comes back with an Error saying... Unknown column 'username here' in 'where clause'. Now the username is in the database as I have just logged in with it and I am taking it I have the Query wrong somewhere.
what i'm working on is, i have VB with a loaded Access DB, and i'm using a query to display the information, in a list box and in indivual labels. i have it so it will allow new entries to be made, however i can't figure out the exact code to get it to update to the program the only code i currently am able to show is this since everything is basically being done through access
I have a listbox which content is based on a treeview. When the user doubleclicks an item in the listbox the treeview will be updated and aftervards all the items in the listbox will be removed and the text of each TreeNode in the TreeView will be addedto the ListBox
I'm having trouble removing both the number of adult golfers and children golfers in a group. I want to remove the item as well as update the order subtotal.
The Minigolf form code
Dim intTotalGolfers As Integer = 0 If IsNumeric(txtNumberOfAdults.Text) Then If CInt(txtNumberOfAdults.Text) >= 0 Then
If strCustomerOrder = "A1#" Then decSubtotal = ANTACID_ONE mintQuantity += 1 ShoppingCartForm.lstShoppingCart.Items.Add(("A1" & vbTab & vbTab & "Alka-Seltzer Antacid" _ [Code] ..... I want my listbox to not display duplicate items. I just want it to update the quantity(Qty).
I come from Access and I am developing now my first windows form app in visual basic 2010 based on a Access database *.mdb. The thing is i have an access db with 5 tables. I have created the forms, connected to the database, all is working great. Parent- child relations are working, datagrids and comboboxes populate the right way, buttons are working.
But now I want to populate listbox, and combox from tables with queries. Like in access I would like, for example to populate two different listboxes bound to the same table with different queries, so that the listboxes give different results, based on different variables or textboxes.
But I don't know how to attack the problem: the query works against the tableadapter, so the info it gives back is always the same. I have tried to duplicate the tableadapter of the table i want to query, writing different sql queries in both, but it does not seem to work. I don't know in what direction I should ivestigate: LINQ, sql queriess, coded queries, filtering the listbox...