I have some basic code here that calls in an Access Database ("Houses") and that's about all. However, every time I click the button, the size of the DataGridView doubles. What I mean is that if the actual Access database has 5 rows, the DataGridView shows the correct database initially, but after each click of the button it goes up to 10 rows (they repeat), then 15, then 20 etc. Unfortunately I can't place this in the Form_Load area.
I tried placing "dt.rows.clear()" before "dgv.DataSource = dt", but it wipes everything. Also tried "DirectCast(Dgv.DataSource, DataTable).Rows.Clear()" and "Dgv.Datasource = Nothing"
Public Class frmHouses
Dim dt As DataTable = New DataTable()
Dim connStr As String = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=Houses.accdb"
Dim sqlStr As String = "SELECT * FROM Property"
Private Sub btnRecord_Click(sender As Object, e As EventArgs) Handles btnRecord.Click
Dim dataAdapter As OleDb.OleDbDataAdapter = New OleDb.OleDbDataAdapter(sqlStr, connStr)
dataAdapter.Fill(dt)
dataAdapter.Dispose()
dgv.DataSource = dt
End Sub
Thanks!
Public Class frmHouses
Dim connStr As String = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=Houses.accdb"
Dim sqlStr As String = "SELECT * FROM Property"
Private Sub btnRecord_Click(sender As Object, e As EventArgs) Handles btnRecord.Click
Dim dt As DataTable = New DataTable()
Dim dataAdapter As OleDb.OleDbDataAdapter = New OleDb.OleDbDataAdapter(sqlStr, connStr)
dataAdapter.Fill(dt)
dataAdapter.Dispose()
dgv.DataSource = dt
End Sub
OR you can
Public Class frmHouses
Dim dt As DataTable = New DataTable()
Dim connStr As String = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=Houses.accdb"
Dim sqlStr As String = "SELECT * FROM Property"
Private Sub btnRecord_Click(sender As Object, e As EventArgs) Handles btnRecord.Click
dt.clear()
Dim dataAdapter As OleDb.OleDbDataAdapter = New OleDb.OleDbDataAdapter(sqlStr, connStr)
dataAdapter.Fill(dt)
dataAdapter.Dispose()
dgv.DataSource = dt
End Sub
Public Class frmHouses
Dim dt As DataTable = New DataTable()
Dim connStr As String = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=Houses.accdb"
Dim sqlStr As String = "SELECT * FROM Property"
Private Sub btnRecord_Click(sender As Object, e As EventArgs) Handles btnRecord.Click
Dim dataAdapter As OleDb.OleDbDataAdapter = New OleDb.OleDbDataAdapter(sqlStr, connStr)
dataAdapter.Fill(dt)
dataAdapter.Dispose()
IF dgv.Rows.Count > 0 Then
dgv.Rows.Clear()
End IF
dgv.DataSource = dt
End Sub
Related
i'm trying to get the image from SQL to picturebox using Listbox in in VB.
here is my sql sample table.
and here is my VB Design form, so what I'm trying to do is when I load the form, if an item in the listbox is selected, i want it to get the image(Binary Data) from sql to picturebox in vb net.
and the code I'm working with it give me this error:
VB full code:
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
connect()
Dim co As New SqlConnection("Data Source=WXCQSDQSD\SQLEXPRESS;Initial Catalog=food;Integrated Security = True")
co.Open()
Dim com As New SqlCommand("SELECT Image from Items where ItemName = '" & ListBox1.SelectedIndex & "'", co)
Dim img As Byte() = DirectCast(com.ExecuteScalar(), Byte())
Dim ms As MemoryStream = New MemoryStream(img)
Dim dt = GetDataFromSql()
Dim BndSrc As New BindingSource()
BndSrc.DataSource = dt
ListBox1.DisplayMember = "ItemName"
ListBox1.DataSource = BndSrc
TextBox1.DataBindings.Add("Text", BndSrc, "ItemID")
TextBox2.DataBindings.Add("Text", BndSrc, "ItemName")
TextBox3.DataBindings.Add("Text", BndSrc, "Details")
PictureBox1.Image = Image.FromStream(ms)
End Sub
Private Function GetDataFromSql() As DataTable
Dim dt As New DataTable
Using connection As New SqlConnection("Data Source=WXCQSDQSD\SQLEXPRESS;Initial Catalog=food;Integrated Security = True"),
cmd As New SqlCommand("select * FROM Items", connection)
connection.Open()
Using reader = cmd.ExecuteReader
dt.Load(reader)
End Using
End Using
Return dt
End Function
Remove the picture retrieval from the Form.Load. We have selected all the data in the GetDataFromSql function. The magic happens in the ListBox1.SelectedIndexChanged method.
The SelectedIndexChanged will occur as a result of the code in the Form.Load and every time the selection changes. When we bind the the list box to to binding source the entire row is added as a DataRowView. We can use this to get the data in the Image column. First check if the field is null. Next cast to a byte array. Take the byte array and pass it to the constructor of a MemoryStream. Streams need to be disposed so it is in a Using block. Finally the stream can be assigned to the Image property of the PictureBox.
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
Dim dt = GetDataFromSql()
Dim BndSrc As New BindingSource()
BndSrc.DataSource = dt
ListBox1.DisplayMember = "ItemName"
ListBox1.DataSource = BndSrc
TextBox1.DataBindings.Add("Text", BndSrc, "ItemID")
TextBox2.DataBindings.Add("Text", BndSrc, "ItemName")
TextBox3.DataBindings.Add("Text", BndSrc, "Details")
End Sub
Private Function GetDataFromSql() As DataTable
Dim dt As New DataTable
Using connection As New SqlConnection("Data Source=WXCQSDQSD\SQLEXPRESS;Initial Catalog=food;Integrated Security = True"),
cmd As New SqlCommand("select * FROM Items", connection)
connection.Open()
Using reader = cmd.ExecuteReader
dt.Load(reader)
End Using
End Using
Return dt
End Function
Private Sub ListBox1_SelectedIndexChanged(sender As Object, e As EventArgs) Handles ListBox1.SelectedIndexChanged
Dim row = DirectCast(ListBox1.SelectedItem, DataRowView)
If row("Image") IsNot Nothing Then
Dim b() As Byte = DirectCast(row("Image"), Byte()) '< ------ Cast the field to a Byte array.
Using ms As New System.IO.MemoryStream(b)
PictureBox1.Image = System.Drawing.Image.FromStream(ms)
End Using
Else
PictureBox1.Image = Nothing
End If
End Sub
EDIT
I switched the code over to a database I have available for testing. Even though it is not your database, I am sure you will be able to follow the code.
Here is the schema of my database.
The main difference is I moved the DataTable to a class level variable so it can be seen from all methods. I changed the GetDataFromSql to a Sub. It adds the data to the class level DataTable (Bounddt). The AddItem method first gets the Byte() from a file. The row is added to the DataTable with an Object array with elements that match the DataTable.
Private Bounddt As New DataTable
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
GetDataFromSql()
Dim BndSrc As New BindingSource()
BndSrc.DataSource = Bounddt
ListBox1.DisplayMember = "CustomerID"
ListBox1.DataSource = BndSrc
TextBox1.DataBindings.Add("Text", BndSrc, "CustomerID")
TextBox2.DataBindings.Add("Text", BndSrc, "CustomerName")
End Sub
Private Sub GetDataFromSql()
Using connection As New SqlConnection("Data Source=****;Initial Catalog='Small Database';Integrated Security=True;Connect Timeout=30;Encrypt=False;TrustServerCertificate=False;ApplicationIntent=ReadWrite;MultiSubnetFailover=False"),
cmd As New SqlCommand("select * FROM Sales.Customer", connection)
connection.Open()
Using reader = cmd.ExecuteReader
Bounddt.Load(reader)
End Using
End Using
'Return dt
End Sub
Private Sub ListBox1_SelectedIndexChanged(sender As Object, e As EventArgs) Handles ListBox1.SelectedIndexChanged
Dim row = DirectCast(ListBox1.SelectedItem, DataRowView)
If row("Picture") IsNot Nothing Then
Dim b() As Byte = DirectCast(row("Picture"), Byte()) '< ------ Cast the field to a Byte array.
Using ms As New System.IO.MemoryStream(b)
PictureBox1.Image = System.Drawing.Image.FromStream(ms)
End Using
Else
PictureBox1.Image = Nothing
End If
End Sub
Private Sub AddItem()
Dim picture = GetByteArr("C:\Users\maryo\OneDrive\Documents\Graphics\Animals\squirrel.png")
Bounddt.Rows.Add({5, "George", 74, 62, "George", picture})
End Sub
Private Function GetByteArr(path As String) As Byte()
Dim img = Image.FromFile(path)
Dim arr As Byte()
Dim imgFor As Imaging.ImageFormat
Dim extension = path.Substring(path.LastIndexOf(".") + 1)
'There is a longer list of formats available in ImageFormat
Select Case extension
Case "png"
imgFor = Imaging.ImageFormat.Png
Case "jpg", "jpeg"
imgFor = Imaging.ImageFormat.Jpeg
Case "bmp"
imgFor = Imaging.ImageFormat.Bmp
Case Else
MessageBox.Show("Not a valid image format")
Return Nothing
End Select
Using ms As New MemoryStream
img.Save(ms, imgFor)
arr = ms.ToArray
End Using
Return arr
End Function
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
AddItem()
End Sub
Imports System.Data.SqlClient
Imports System.IO
Public Class Form1
Dim con As SqlConnection
Dim cmd As SqlCommand
Dim rdr As SqlDataReader
Dim da As SqlDataAdapter
Private Const cs As String = "ConnectionString"
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
con = New SqlConnection(cs)
con.Open()
cmd = New SqlCommand("select * from [dbo].[Item_Details]", con)
rdr = cmd.ExecuteReader()
While rdr.Read
ListBox1.Items.Add(rdr(1))
End While
con.Close()
End Sub
Private Sub ListBox1_MouseClick(sender As Object, e As MouseEventArgs) Handles ListBox1.MouseClick
Try
con = New SqlConnection(cs)
con.Open()
da = New SqlDataAdapter("Select * from Item_Details where itemname='" & ListBox1.SelectedItem.ToString() & "'", con)
Dim dt As New DataTable
da.Fill(dt)
For Each row As DataRow In dt.Rows
TextBox1.Text = row(0).ToString()
TextBox2.Text = row(1).ToString()
TextBox3.Text = row(2).ToString()
Dim data As Byte() = row(3)
Dim ms As New MemoryStream(data)
PictureBox1.Image = Image.FromStream(ms)
Next
Catch ex As Exception
MsgBox(ex.Message)
End Try
End Sub
End Class
This is my first post so forgive me if I goof!
I am trying to update myself from VBA to VB.Net. Using loads of help from Google etc I am doing Ok except when I try to update my table from a DataGridView. It just does not update. What I would like is that a cell is update on change. My code so far is shown (I have tried all sorts of builder, tables etc so my code may have a smattering of these that are redundant):
Imports System.Data.SqlClient
Imports System.IO
Imports Microsoft.SqlServer
Public Class FrmData
Private dsS As DataSet = New DataSet
Private adpS As SqlDataAdapter
Private builder As SqlCommandBuilder
Private bsource = New BindingSource
Private Sub FrmData_Load(sender As Object, e As EventArgs) Handles
MyBase.Load
Dim sqlS = "SELECT [Data].[Date] AS [Date] ,
[Data].[PaidBy] AS [Paid By] ,
[Data].[PaidAmount] AS [Paid Amount (£)],
[Data].[AmountLeft] AS [Amount Left (£)]
FROM [Data] WHERE [Data].[Name]= '" & strName & "'
ORDER BY [Data].[Date] DESC"
Dim adpS As SqlDataAdapter
adpS = New SqlDataAdapter(sqlS, connection)
builder = New SqlCommandBuilder(adpS)
Dim dTable As New DataTable
bsource.DataSource = dTable
bsource.EndEdit()
adpS.Fill(dTable)
connection.Close()
DataGridView1.DataSource = dTable
End Sub
Private Sub DataGridView1_CellEndEdit(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) Handles DataGridView1.CellEndEdit
DataGridView1.EndEdit()
Dim dt As DataTable
dt = TryCast(DataGridView1.DataSource, DataTable)
Dim x As Integer = 0
If dt.GetChanges() Is Nothing Then
MessageBox.Show("The table contains no changes to save.")
Else
Dim builder = New SqlCommandBuilder(adpS)
Dim rowsAffected As Integer = adpS.Update(dt)
If rowsAffected = 0 Then
MessageBox.Show("No rows were affected by the save operation.")
Else
MessageBox.Show(rowsAffected & " rows were affected by the save operation.")
End If
End If
End Sub
End Class
Any help would be appreciated.
This is for SQL Server, right. Try it like this.
Imports System.Data.SqlClient
Public Class Form1
Dim sCommand As SqlCommand
Dim sAdapter As SqlDataAdapter
Dim sBuilder As SqlCommandBuilder
Dim sDs As DataSet
Dim sTable As DataTable
Private Sub load_btn_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles load_btn.Click
Dim connectionString As String = "Data Source=.;Initial Catalog=pubs;Integrated Security=True"
Dim sql As String = "SELECT * FROM Stores"
Dim connection As New SqlConnection(connectionString)
connection.Open()
sCommand = New SqlCommand(sql, connection)
sAdapter = New SqlDataAdapter(sCommand)
sBuilder = New SqlCommandBuilder(sAdapter)
sDs = New DataSet()
sAdapter.Fill(sDs, "Stores")
sTable = sDs.Tables("Stores")
connection.Close()
DataGridView1.DataSource = sDs.Tables("Stores")
DataGridView1.ReadOnly = True
save_btn.Enabled = False
DataGridView1.SelectionMode = DataGridViewSelectionMode.FullRowSelect
End Sub
Private Sub new_btn_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles new_btn.Click
DataGridView1.[ReadOnly] = False
save_btn.Enabled = True
new_btn.Enabled = False
delete_btn.Enabled = False
End Sub
Private Sub delete_btn_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles delete_btn.Click
If MessageBox.Show("Do you want to delete this row ?", "Delete", MessageBoxButtons.YesNo) = DialogResult.Yes Then
DataGridView1.Rows.RemoveAt(DataGridView1.SelectedRows(0).Index)
sAdapter.Update(sTable)
End If
End Sub
Private Sub save_btn_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles save_btn.Click
sAdapter.Update(sTable)
DataGridView1.[ReadOnly] = True
save_btn.Enabled = False
new_btn.Enabled = True
delete_btn.Enabled = True
End Sub
End Class
After two days working on this, I finally got it right for myself! Also, I had an eye on #ryguy72 codes as well. these are the steps you can take to get there:
Step 1: Drag and drop DataGridView into your form
Step 2: In the App.config add this between configuration:
<connectionStrings>
<add name="ehsanConnection" connectionString="Data Source=XXX
; User= XX; Password= XXX" ProviderName="System.Data.SqlClient"/>
</connectionStrings>
Step 3: The code below shows how you can get the DataGridView programmatically right, it worked perfectly fine for me.
Dim sCommand As SqlCommand
Dim sAdapter As SqlDataAdapter
Dim sBuilder As SqlCommandBuilder
Dim sDs As DataSet
Dim sTable As DataTable
Dim connStr As String =
ConfigurationManager.ConnectionStrings("ehsanConnection").ToString
Dim connStri = New SqlConnection(connStr)
Dim sql As String = "SELECT * FROM [Ehsan].[dbo].[Data]"
sCommand = New SqlCommand(sql, connStri)
sAdapter = New SqlDataAdapter(sCommand)
sBuilder = New SqlCommandBuilder(sAdapter)
sDs = New DataSet()
sAdapter.Fill(sDs, "Data")
sTable = sDs.Tables("Data")
connStri.Close()
DataGridView1.DataSource = sDs.Tables("Data")
The main point here was that I had to use [Ehsan].[dbo].[Data] not only the name of the table, "Data". Actually, it didn't work for me that way and it kept complaining!
Step 4: If you want to update your database after you changed some of the records in datagridview, use this code :
sAdapter.Update(sDs.Tables(0))
Main important point is that: "you have to set a primary key in your table first otherwise it won't work!"
Can you please teach me on how to extract data from SQL query access database and place it into a Variable holder? I've been struggling for a week already and i've been really trying hard, please advise Thanks
This is what i have done so far :
Imports System.Data.OleDb
Public Class ModifyForm
Dim connstring As String = "Provider=Microsoft.ACE.OLEDB.12.0; Data Source= c:\Databse\Company_db.accdb"
Dim conn As New OleDbConnection
Private Sub MainMenuButton_Click(sender As Object, e As EventArgs) Handles MainMenuButton.Click
Me.Close()
Form1.Show()
End Sub
Private Sub CloseButton_Click(sender As Object, e As EventArgs) Handles CloseButton.Click
Me.Close()
Form1.Close()
End Sub
Private Sub DeleteBut_Click(sender As Object, e As EventArgs) Handles DeleteBut.Click
End Sub
Private Sub ModifyForm_Load(sender As Object, e As EventArgs) Handles MyBase.Load
'TODO: This line of code loads data into the "Company_dbDataSet1.tbl_empinfo" table. You can move, or remove it, as needed.'
Me.Tbl_empinfoTableAdapter.Fill(Me.Company_dbDataSet1.tbl_empinfo)
End Sub
Private Sub eNumText_SelectedIndexChanged(sender As Object, e As EventArgs) Handles eNumText.SelectedIndexChanged
Dim empNum As String
Dim empFname As String
Dim empLname As String
Dim empDept As String
Dim empStat As String
Dim empYears As String
empNum = eNumText.Text
empFname = empFnameText.Text
empLname = empLnameText.Text
empDept = DeptText.Text
empStat = StatText.Text
empYears = yearstext.Text
MsgBox(empNum)
Dim conn As New OleDbConnection
conn.Open()
Dim SqlQuerry As String = "SELECT * FROM tbl_empinfo WHERE EmpID like empNum"
Dim SqlCommand As New OleDbCommand
Dim SqlAdapter As New OleDbDataAdapter
Dim Table As New DataTable
With SqlCommand
.CommandText = SqlQuerry
.Connection = conn
End With
With SqlAdapter
.SelectCommand = SqlCommand
.Fill(Table)
End With
DataGridView1.Rows.Clear()
For i = 0 To Table.Rows.Count - 1
With DataGridView1
.Rows.Add(Table.Rows(i)("EmpID"), (Table.Rows(i)("FirstName")))
End With
Next
'Dim dbSource = "Data Source= C:\Databse\Company_db.accdb"'
conn.Close()
End Sub
Forgetting about the extra code, as was mentioned already, all you need to do is declare your variables:
Dim DBID As Integer ' Or whatever type you're using for the ID field
Dim DBFirstName As String
Then inside the For/Next loop, just use:
DBID = Table.Rows(i)("EmpID")
DBFirstName = Table.Rows(i)("FirstName")
That is only if you're going to use the variables within the for/next loop, otherwise you'll be overwriting them for every record. If you need to store all the values, you'll have to use arrays instead.
I have three columns in SQL, which I want the data displayed in three textboxes by clicking an item in ComboBox.
The issue is not really displaying. I can save the data fine and display. However, one of the text fields will only show one cell and not update when a different item is selected. Hope this is making sense.
Here is the code I have for saving:
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim myconnect As New SqlClient.SqlConnection
myconnect.ConnectionString = "Data Source=.\INFLOWSQL;Initial Catalog=RioDiary;Integrated Security=True"
Dim mycommand As SqlClient.SqlCommand = New SqlClient.SqlCommand()
mycommand.Connection = myconnect
mycommand.CommandText = "INSERT INTO MyDiary (Title, DiaryContent, DiaryDate) VALUES (#Title, #DiaryContent, #DiaryDate)"
myconnect.Open()
Try
mycommand.Parameters.Add("#Title", SqlDbType.VarChar).Value = TextBox1.Text
mycommand.Parameters.Add("#DiaryContent", SqlDbType.VarChar).Value = TextBox2.Text
mycommand.Parameters.Add("#DiaryDate", SqlDbType.VarChar).Value = TextBox3.Text
mycommand.ExecuteNonQuery()
MsgBox("Success")
Catch ex As System.Data.SqlClient.SqlException
And here is the code for displaying in form1:
Imports System.Data.SqlClient
Public Class Form1
Dim con As New SqlConnection
Dim ds As New DataSet
Dim da As New SqlDataAdapter
Dim sql As String
Dim inc As Integer
Dim MaxRows As Integer
Dim max As String
Dim dt As New DataTable
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
'TODO: This line of code loads data into the 'RioDiaryDataSet5.MyDiary' table. You can move, or remove it, as needed.
Me.MyDiaryTableAdapter.Fill(Me.RioDiaryDataSet5.MyDiary)
Dim con As New SqlConnection(" Data Source=.\INFLOWSQL;Initial Catalog=RioDiary;Integrated Security=True")
Dim cmd As New SqlCommand("Select Title,DiaryContent,DiaryDate FROM MyDiary ")
Dim da As New SqlDataAdapter
da.SelectCommand = cmd
cmd.Connection = con
da.Fill(ds, "MyDiary")
con.Open()
ComboBox1.DataSource = ds.Tables(0)
ComboBox1.DisplayMember = "Title'"
ComboBox1.ValueMember = "DiaryContent"
End Sub
Private Sub NewEntryToolStripMenuItem_Click(sender As Object, e As EventArgs) Handles NewEntryToolStripMenuItem.Click
AddEntry.Show()
End Sub
Private Sub ComboBox1_SelectedIndexChanged(sender As Object, e As EventArgs) Handles ComboBox1.SelectedIndexChanged
If (Not Me.ComboBox1.SelectedValue Is Nothing) Then
Me.TextBox2.Text = ComboBox1.Text
Me.TextBox3.Text = ComboBox1.SelectedValue.ToString
End If
End Sub
Private Sub TextBox1_TextChanged(sender As Object, e As EventArgs) Handles TextBox1.TextChanged
If dt.Rows.Count > 0 Then
TextBox1.Text = dt.Rows(0)("DiaryDate").ToString() 'Where ColumnName is the Field from the DB that you want to display
End If
End Sub
End Class
As you can see from the code, I want to display Title and DiaryContent in two separate textboxes by clicking on Title in the Combobox. This works fine.
The issue I have is DiaryDate only shows the first entry and does not update when selecting the Item from ComboBox.
Can anyone help?
You can try to play with ComboBox's SelectedItem property. Since ComboBox's DataSource is DataTable here, SelectedItem of ComboBox represent a row in DataTable. Given DataRow in hand, you can display value of any column of DataRow in TextBoxes :
........
If (Not Me.ComboBox1.SelectedItem Is Nothing) Then
Dim SelectedItem = TryCast(comboBox1.SelectedItem, DataRowView)
Me.TextBox1.Text = SelectedItem.Row("Title").ToString()
Me.TextBox2.Text = SelectedItem.Row("DiaryContent").ToString()
Me.TextBox3.Text = SelectedItem.Row("DiaryDate").ToString()
End If
........
Public Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim cn As New SqlClient.SqlConnection("Data Source=thee-pc;Initial Catalog=jobportal;Integrated Security=True")
Dim cmd As New SqlClient.SqlCommand
Dim tbl As New DataTable
Dim da As New SqlClient.SqlDataAdapter
Dim reader As SqlClient.SqlDataReader
Try
cn.Open()
Dim sql As String
sql = "select * from Register"
cmd = New SqlClient.SqlCommand(sql, cn)
reader = cmd.ExecuteReader
While reader.Read
Dim id = reader.Item("cid")
ComboBox1.Items.Add(id)
End While
cn.Close()
Catch ex As Exception
MessageBox.Show(ex.Message)
End Try
End Sub
Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged
Dim cn As New SqlClient.SqlConnection("Data Source=thee-pc;Initial Catalog=jobportal;Integrated Security=True")
Dim cmd As New SqlClient.SqlCommand
Dim tbl As New DataTable
Dim da As New SqlClient.SqlDataAdapter
Dim reader As SqlClient.SqlDataReader
Try
cn.Open()
Dim sql As String
sql = "select * from register where cid ='" + ComboBox1.Text + "'"
cmd = New SqlClient.SqlCommand(sql, cn)
reader = cmd.ExecuteReader
While reader.Read
TextBox1.Text = reader.Item("cname")
TextBox2.Text = reader.Item("dob")
End While
cn.Close()
Catch ex As Exception
MessageBox.Show(ex.Message)
End Try
End Sub
I've been looking at this problem for a while and can't see what I'm doing wrong.
I want to save changes from DataSet(ds.Tables("Login")) to physical Database (Data Source='|DataDirectory|\MyDatabase.accdb). But it doesn't work correctly. Data not saved in physical Database.
Any Ideas how to solve it ??
Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles txtUsername.Click
Dim ds As New DataSet()
Dim dt As DataTable
ds.Tables.Add(New DataTable("Login"))
Dim connStr As String = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source='|DataDirectory|\MyDatabase.accdb'"
Dim sqlStr As String = "SELECT * FROM Login"
Dim dataAdapter As New OleDb.OleDbDataAdapter(sqlStr, connStr)
dataAdapter.Fill(ds.Tables("Login"))
dt = ds.Tables("Login")
Dim dr As DataRow
dr = dt.NewRow()
dr("Username") = txtUserName.Text
dr("Password") = txtPassword.Text
dt.Rows.Add(dr)
ds.AcceptChanges()
dataAdapter.Update(ds.Tables("Login"))
End Sub
Look at this article and particularly step 7 which states you will need to set the UpdateCommand.
https://support.microsoft.com/en-us/kb/301248