This issue is driving me mad, I can't work out why it's happening. I'm running a query in an access db using vb.net then putting the data into a listview. Code:
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim strAccessConn As String = "Provider = Microsoft.ACE.OLEDB.12.0; Data Source = T:\mydb.accdb"
Dim cn As OleDbConnection = New OleDbConnection(strAccessConn)
Dim ds As New DataSet
Dim dt As DataTable
'Note the query is entered as a string.
Dim da As New OleDbDataAdapter("Q_LIST", cn) 'is the name of the query in Access
'Set the CommandType of the SelectCommand to TableDirect
da.SelectCommand.CommandType = CommandType.TableDirect
da.Fill(ds, "mytable")
dt = ds.Tables("mytable")
ListViewBatchResults.MultiSelect = True
ListViewBatchResults.View = View.Details
ListViewBatchResults.GridLines = True
ListViewBatchResults.Columns.Clear()
ListViewBatchResults.Items.Clear()
For Each col As DataColumn In dt.Columns()
ListViewBatchResults.Columns.Add(col.ToString)
Next
MsgBox(dt.Rows.Count)
For Each row As DataRow In dt.Rows()
Dim lst As ListViewItem
lst = ListViewBatchResults.Items.Add(row(0))
For i As Integer = 1 To dt.Columns.Count - 1
lst.SubItems.Add(row(i))
Next
Next
End Sub
This listview is not showing all the returned data though, and I can't work out why - it works on other queries in the DB but not this one for some reason. The row count shows that there are 264 rows, the listview only shows 3 of them when I run the project however. What the heck is going on?
Cheers!
Dim lst As ListViewItem
to
Dim lst As New ListViewItem
Related
I'm trying to synchronize the reading of a SQL Server table with 2 columns (nom_unité and cout_unité).
The first column (nom_unité) will be populated into a combobox and I want the second column (cout_unité) to be synchronized into a label with the first combobox (meaning, when I change the combobox value, the label should change too refering to the table).
I can do this with 2 comboboxes :
Dim connection As New SqlConnection("Data Source=xxx")
Dim dt As New DataTable
Dim sqlquery As String
connection.Open()
sqlquery = "select * from liste_unités"
Dim SQL As New SqlDataAdapter(sqlquery, connection)
SQL.Fill(dt)
Dim cmd As New SqlCommand(sqlquery, connection)
ComboBoxC1L1.DataSource = dt
ComboBoxC1L1.DisplayMember = "nom_unité"
ComboBox1.DataSource = dt
ComboBox1.DisplayMember = "cout_unité"
but I do not know how to do it with a label (instead of ComboBox1).
I believe I can achieve it with something like that :
Dim sqlcmd As New SqlCommand("select * from liste_unités", connection)
Dim myreader As SqlDataReader
myreader = sqlcmd.ExecuteReader()
myreader.Read()
If myreader.HasRows Then
Label1.Text = myreader.Item("cout_unité").ToString
End If
but this is only reading the first row and not changing the label value when changing the first combobox selected value.
How to do it the easiest and most efficient way ?
Thank you :)
As you have assigned the datasource of the combobox to a datatable which contains the information you need, you can get that information when the value of the combobox changes.
I started a new Windows Forms project and put a combobox (named "cbNomUnité") and a label (named "lblCoutUnité") on Form1 and used this code:
Imports System.Data.SqlClient
Public Class Form1
Dim connStr As String = "Server=.\SQLEXPRESS;Database=Testing;Trusted_Connection=true;"
Sub PopulateCB()
Dim sql = "SELECT nom_unité, cout_unité FROM liste_unités"
Dim dt As New DataTable
Using conn As New SqlConnection(connStr),
da As New SqlDataAdapter(sql, conn)
da.Fill(dt)
End Using
cbNomUnité.DataSource = dt
cbNomUnité.DisplayMember = "nom_unité"
End Sub
Private Sub ComboBox1_SelectedIndexChanged(sender As Object, e As EventArgs) Handles cbNomUnité.SelectedIndexChanged
Dim cb = DirectCast(sender, ComboBox)
If cb.SelectedIndex >= 0 Then
Dim val = DirectCast(cb.SelectedItem, DataRowView).Row.Field(Of String)("cout_unité")
lblCoutUnité.Text = val
End If
End Sub
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
PopulateCB()
End Sub
End Class
To get a program that does this:
(Refresh the page to see the animation again.)
I've tried to add relation, to show the data on combobox and datagridview. I've tried this code below
Private Sub LoadSemester()
Me.OpenConn()
Dim dSet As New DataSet
Dim sql1 As String = "SELECT * FROM tbl_semester"
Dim comm1 As New SqlClient.SqlCommand(sql1, cnn)
Dim daSemester As SqlClient.SqlDataAdapter
Dim sql2 As String = "SELECT * FROM tbl_mk"
Dim comm2 As New SqlClient.SqlCommand(sql2, cnn)
Dim daMK As SqlClient.SqlDataAdapter
daMK = New SqlClient.SqlDataAdapter(comm2)
dSet.Clear()
daMK.Fill(dSet, "tbl_mk")
daSemester = New SqlClient.SqlDataAdapter(comm1)
dSet.Clear()
daSemester.Fill(dSet, "tbl_semester")
dSet.Relations.Add("relation", dSet.Tables("tbl_semester").Columns("id_pk"), dSet.Tables("tbl_pk").Columns("id_pk"))
With cmbSemester
.DataSource = dSet.Tables("tbl_semester")
.DisplayMember = "semester"
.ValueMember = "id_semester"
.SelectedIndex = 0
End With
'my datagridview here
End Sub
But it displayed nothing. But when I deleted the 'dSet.Relations.Add("relation", dSet.Tables("tbl_semester").Columns("id_pk"), dSet.Tables("tbl_pk").Columns("id_pk"))' the combobox showed the data.
I figured out maybe the problem is the dSet.Relation code. FYI, I am using SQLServer 2005 and VS Express 2012.
I am a Vb nooby and I have trouble to add specific Items to my Listview from a database.
I would like to compare the value of a combobox with a column value of a table.
To proof if they are equal like apple = apple
When they are equal the whole data set should be added to my ListView. (Only data sets which have the equal value like the selected item of the combobox)
Please Help !!
Thanks a lot and best regards
You can try below code..
Imports System.Data.SqlClient
Public Class Form1
Dim conn As SqlConnection
Dim cmd As SqlCommand
Dim da As SqlDataAdapter
Dim ds As DataSet
Dim itemcoll(100) As String
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Me.ListView1.View = View.Details
Me.ListView1.GridLines = True
conn = New SqlConnection("Data Source=SQLEXPRESS;Initial Catalog=Northwind;Persist Security Info=True;User ID=id;Password=pass")
Dim strQ As String = String.Empty
strQ = "SELECT * FROM Northwind.dbo.Products"
cmd = New SqlCommand(strQ, conn)
da = New SqlDataAdapter(cmd)
ds = New DataSet
da.Fill(ds, "Table")
Dim i As Integer = 0
Dim j As Integer = 0
' adding the columns in ListView
For i = 0 To ds.Tables(0).Columns.Count - 1
Me.ListView1.Columns.Add(ds.Tables(0).Columns(i).ColumnName.ToString())
Next
'Now adding the Items in Listview
For i = 0 To ds.Tables(0).Rows.Count - 1
For j = 0 To ds.Tables(0).Columns.Count - 1
itemcoll(j) = ds.Tables(0).Rows(i)(j).ToString()
Next
Dim lvi As New ListViewItem(itemcoll)
Me.ListView1.Items.Add(lvi)
Next
End Sub
End Class
You can try this link.
Thanks for your help.
In my solution, I just set a parameter into the sql statement.
Public Function getRahmenvertrag**(ByVal costumerID As Integer)** As List(Of Rahmenvertrag)
Dim sqlCom As New SqlServerCe.SqlCeCommand
sqlCom.CommandText = **"SELECT * FROM Rahmenvertrag LEFT OUTER JOIN Kunde ON Kunden_FID = Kunden_ID WHERE Kunden_ID = #Kunde "**
**sqlCom.Parameters.AddWithValue("Kunde", costumerID)**
Private Sub ComboBox1_Click(sender As Object, e As EventArgs) Handles ComboBox1.SelectedIndexChanged
ListView4.DataBindings.Clear()
ListView4.Items.Clear()
If IsNothing(ComboBox1.SelectedItem) = False Then
For Each Rahmenvertrag As Rahmenvertrag In controller.getRahmenvertrag(ComboBox1.SelectedItem.kunde_ID)
With ListView4.Items.Add(Rahmenvertrag.bezeichnung)
.SubItems.Add(Rahmenvertrag.inhalt)
End With
Next
End If
End Sub
So far I have this, which doesn't work. I think I'm off on the wrong path here. Basically I'm trying to transfer all of the items of a list box to separate columns of an Access DB named CalcOps, with the columns of "NumOne, Operator, NumTwo, Result). The list box can currently have 10 total list items, all of which should be transferred when the button is clicked (ButtonDBSave). The list box items are put together from separate text boxes and the operator that is clicked on is transferred to the list box via Listbox.tag. Not getting any errors...or anything else.
Private Sub ButtonDBSave_Click(sender As Object, e As EventArgs) Handles ButtonDBSave.Click
Dim con As New OleDb.OleDbConnection
Dim dbProvider As String
Dim dbSource As String
dbProvider = "Provider=Microsoft.ACE.OLEDB.12.0"
dbSource = "Data Source=|DataDirectory|\CalcDB.accdb"
con.ConnectionString = dbProvider & dbSource
Dim arr As New List(Of String)
Dim cmdText As String = "INSERT INTO NumOne ()"
Dim cmd As OleDb.OleDbCommand = New OleDb.OleDbCommand(cmdText)
cmd.CommandType = CommandType.Text
con.Open()
With cmd.Parameters
.Add("#NumOne", OleDb.OleDbType.VarChar).Value = NumOne.Text
End With
End Sub
When the program is executed, the datagridview populate data and also the textboxes(example StockNumber,Description) and when i typed words in the search textbox ,the datagridview filters the matching words.When I clicked the item in the datagridview the textboxes does not changed it didnt show the information...
what the solution for my problem..i need to display the information in the textboxes when i clicked the item in the datagridview..
Private Sub txtreg_delsrch_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles txtreg_delsrch.TextChanged
Dim con As OleDbConnection = New OleDbConnection("Provider=Microsoft.jet.oledb.4.0;data source=C:\Users\sony\Documents\Visual Studio 2008\Projects\Inventory\ItemInventory.mdb")
Dim cmd As OleDbCommand = New OleDbCommand("SELECT StockNo,Item,Description,Reference,Quantity,Unit FROM Supplies_Regular WHERE Description Like '%" & txtreg_delsrch.Text & "%'", con)
con.Open()
Dim myDA As OleDbDataAdapter = New OleDbDataAdapter(cmd)
Dim myDataSet As DataSet = New DataSet()
myDA.Fill(myDataSet, "MyTable")
Supplies_RegularDataGridView1.DataSource = myDataSet.Tables("MyTable").DefaultView
End Sub
Perhaps you could use BindingSource:
Dim binding = New BindingSource()
With { .DataSource = myDataSet.Tables("MyTable") }
Supplies_RegularDataGridView1.DataSource = binding
StockNumber_textBox1.DataBindings.Add("Text", binding, "StockNo")
Last line simply binds your object's StockNo property to TextBox.Text.
You could do something like this in the Grid CellClick event.
Dim row As Integer = e.RowIndex
Dim col As Integer = e.ColumnIndex
textbox.Text = grid.Item(col, row).value