I currently doing the changepassword function in my vb.net project, user can click change password to change their password
But my code doesnt update correctly , it will show "updated" but when i go to my database access table the data still remain the same
Imports System.Data.OleDb
Imports System.Data.SqlClient
Imports System.IO
Public Class frmUserDetail
Dim ds As New DataSet
Dim dt As New DataTable
Dim cmd As SqlCommand
Dim con As SqlConnection
Dim da As New OleDbDataAdapter
Dim conn As New OleDbConnection
Private Sub FrmUserDetail_Load(sender As Object, e As EventArgs) Handles MyBase.Load
conn.ConnectionString = ("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=..\phoneOnline.accdb;Persist Security Info=false;")
loadUserDetail()
txtUserName.Enabled = False ' set it to false so user cannot do shit with it
End Sub
Public Sub loadUserDetail()
conn.ConnectionString = ("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=..\phoneOnline.accdb;Persist Security Info=false;")
Dim cmd As OleDbCommand
Dim userName As String = frmMain.lblUserLogin.Text
'specify name of the user
Dim search As String = "SELECT * from tblUser WHERE UserName= '" + userName + "'"
cmd = New OleDbCommand(search)
cmd.Connection = conn
Dim dtt As New DataTable()
Dim daa As New OleDbDataAdapter(cmd)
daa.Fill(dtt)
If dtt.Rows.Count() > 0 Then
txtUserName.Text = dtt.Rows(0)(0).ToString 'show the userName
txtUserPassword.Text = dtt.Rows(0)(1).ToString 'show the password of the user
txtEmail.Text = (dtt.Rows(0)(2).ToString) 'show user email
Else
MsgBox("You are currently login as a guest")
End If
End Sub
Private Sub changePassword()
If cbChangePassword.Checked Then
txtChangePassword.Enabled = True
Else
txtChangePassword.Enabled = Not (True)
End If
End Sub
Private Sub CbChangePassword_CheckedChanged(sender As Object, e As EventArgs) Handles cbChangePassword.CheckedChanged
changePassword()
End Sub
Private Sub BtnUpdate_Click(sender As Object, e As EventArgs) Handles btnUpdate.Click
conn.Open()
Dim cmd As OleDbCommand
Dim sql As String = "UPDATE tblUser SET UserPassword=#userpass,Email=#email WHERE UserName=#userName;"
cmd = New OleDbCommand(sql.ToString, conn)
cmd.Parameters.AddWithValue("#username", txtUserName.Text)
cmd.Parameters.AddWithValue("#userpass", txtChangePassword.Text)
cmd.Parameters.AddWithValue("#email", txtEmail.Text) 'pass the time variable from the form 1 to the parameter
cmd.ExecuteNonQuery()
MsgBox("updated")
conn.Close()
End Sub
Private Sub BtnExit_Click(sender As Object, e As EventArgs) Handles btnExit.Click
Me.Hide()
frmMain.Show()
End Sub
End Class
I Expect my database will get updated when i updated it
Related
I would like it so when I delete/edit a record from the datagridview, it will automatically delete/edit the access database file. Here is a snippet of my code which loads the database into the datagridview.
Public Function dbConnect() As Boolean
Try
cn = New OleDbConnection(DataBasePath)
cn.Open()
'MessageBox.Show("is work ")
Return True
Catch ex As Exception
MessageBox.Show("Unable to open the database: " & ex.Message)
Return False
End Try
End Function
Private Function GetOrders() As DataTable
Dim dtOrders As New DataTable
dbConnect()
Dim SQLCMD As New OleDbCommand
SQLCMD.Connection = cn
SQLCMD.CommandText = "Select * From [OrdersTbl]"
dtOrders.Load(SQLCMD.ExecuteReader())
Return dtOrders
End Function
Private Sub EditOrdersForm_Load(sender As Object, e As EventArgs) Handles MyBase.Load
OrdersDataGrid.DataSource = GetOrders()
End Sub
How can I make it so that changes are saved to the local file.
I have a datagridview and a button on the form. Here's the code you can refer to:
Private dt As DataTable = New DataTable
Private da As OleDbDataAdapter
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
Dim connection As OleDbConnection = New OleDbConnection("your connection string")
connection.Open()
Dim cmdTxt As String = "SELECT * FROM yourTable"
da = New OleDbDataAdapter(New OleDbCommand(cmdTxt, connection))
Dim builder As OleDbCommandBuilder = New OleDbCommandBuilder(da)
da.Fill(dt)
Dim source As BindingSource = New BindingSource With {
.DataSource = dt
}
DataGridView1.DataSource = source
connection.Close()
End Sub
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
DataGridView1.EndEdit()
da.Update(dt)
End Sub
Every time you want to update database from your datagridview, just click the button.
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!"
I am using VB to make something to change records in a database. I have a table called tblCustomers. When the user clicks a button on the homeForm, a new form called FormNewCustomer appears which has text boxes for the user to input info to put in the database. After submitting it, the data does get inserted, but it doesn't show in the datagridview.
This is my code:
Imports System.Data.OleDb
Public Class FormNewCustomer
Public connstring As String = "Provider=Microsoft.ACE.OLEDB.12.0; Data Source=ProgramDatabase.accdb"
Public conn As New OleDbConnection(connstring)
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles btnCancel.Click
Me.Close()
End Sub
Private Sub btnCopy_Click(sender As Object, e As EventArgs) Handles btnCopy.Click
If txtCustomerName.Text = "" Or txtAC.Text = "" Then
MsgBox("Enter a Customer Name and a Customer Reference.")
Else
conn.Open()
Dim SqlQuery As String = "INSERT INTO tblCustomers (CustomerName,AC,Address,Phone,Email) VALUES (#CustomerName,#AC,#Address,#Phone,#Email)"
Dim SqlCommand As New OleDbCommand
With SqlCommand
.CommandText = SqlQuery
.Parameters.AddWithValue("#CustomerName", txtCustomerName.Text)
.Parameters.AddWithValue("#AC", txtAC.Text)
.Parameters.AddWithValue("#Address", txtAddress.Text)
.Parameters.AddWithValue("#Phone", txtPhone.Text)
.Parameters.AddWithValue("#Email", txtEmail.Text)
.Connection = conn
.ExecuteNonQuery()
End With
conn.Close()
MsgBox("Successfully added new Customer.")
FormHome.DataGridView1.Refresh()
Me.Close()
End If
End Sub
End Class
Try this Code:
Dim objDataGridView As YourFormClassName = New YourFormClassName
objDataGridView.ShowDialog()
I am trying to save checked items from a checkedlistbox to my SQL database and i am filling my checkedlistbox from the same SQL database,So far i am able to get the text of checked item from the checkedlistbox and i saved it in a string then i used a label to display if i am getting the text of checked item or not and its working but when i try to insert the checked data in database i get a error "Connection property has not been initialized." on ExecuteNonQuery() method.
Imports System.Data
Imports System.Data.SqlClient
Public Class Form1
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
Dim da As New SqlDataAdapter
Dim dt As New DataTable
Dim connectionString As String = "Server=DESKTOP-V12PTAV ;Database=test ;User Id=sa ;Password=wills8877"
Using conn As New SqlConnection(connectionString)
conn.ConnectionString = connectionString
conn.Open()
Dim str As String
str = "Select sem1 From sem"
da = New SqlDataAdapter(str, conn)
dt = New DataTable
da.Fill(dt)
CheckedListBox1.DataSource = dt
CheckedListBox1.DisplayMember = "sem1"
conn.Close()
End Using
End Sub
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim str As String
Dim cmd As New SqlCommand
Dim sql As String
Dim connectionString As String = "Server=DESKTOP-V12PTAV ;Database=test ;User Id=sa ;Password=wills8877"
Using conn As New SqlConnection(connectionString)
conn.Open()
Dim itemChecked As Object
For Each itemChecked In CheckedListBox1.CheckedItems
str = itemChecked.item("sem1").ToString
Label1.Text = str
sql = "insert into pretab(pre) values('" + str + "')"
cmd.ExecuteNonQuery()
Next
conn.Close()
End Using
End Sub
End Class
This error
The problem maybe arised from your query syntax. Try this:
sql = "insert into pretab(pre) values(#str)"
cmd.Parameters.AddWithValue("#str", str)
cmd.ExecuteNonQuery()
OOPS.. I just realised that you forgot to assign your command with connection. So, please try to add the following statement:
cmd = New SqlCommand(sql, conn)
befor execution your command. So the final code should look like this:
sql = "insert into pretab(pre) values(#str)"
cmd = New SqlCommand(sql, conn)
cmd.Parameters.AddWithValue("#str", str)
cmd.ExecuteNonQuery()
First off I would do data operations in a class e.g. (note I focus on inserts). You need to change server and catalog to your server and catalog on SQL-Server.
Imports System.Data.SqlClient
Public Class Operations
Private Server As String = "KARENS-PC"
Private Catalog As String = "CheckedListBoxDatabase"
Private ConnectionString As String = ""
Public Sub New()
ConnectionString = $"Data Source={Server};Initial Catalog={Catalog};Integrated Security=True"
End Sub
Public Function Read() As DataTable
' read rows for checked listbox here
End Function
Public Sub Insert(ByVal sender As List(Of String))
Using cn As SqlConnection = New SqlConnection With {.ConnectionString = ConnectionString}
Using cmd As SqlCommand = New SqlCommand With {.Connection = cn, .CommandText = "insert into pretab(pre) values (#pre)"}
cmd.Parameters.Add(New SqlParameter With {.ParameterName = "#pre", .SqlDbType = SqlDbType.NVarChar})
cn.Open()
For Each item In sender
cmd.Parameters("#pre").Value = item
cmd.ExecuteNonQuery()
Next
End Using
End Using
End Sub
End Class
Form code
Public Class Form1
Private ops As New Operations
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim Result = CheckedListBox1.Items.OfType(Of String).Where(Function(item, index) CheckedListBox1.GetItemChecked(index)).ToList
ops.Insert(Result)
End Sub
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
CheckedListBox1.DataSource = ops.Read
CheckedListBox1.DisplayMember = "sem1"
End Sub
End Class
It appears that you did not provide the connection to the command. Your code was button click
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim str As String
Dim cmd As New SqlCommand
Dim sql As String
Dim connectionString As String = "Server=DESKTOP-V12PTAV ;Database=test ;User Id=sa ;Password=wills8877"
Using conn As New SqlConnection(connectionString)
conn.Open()
Dim itemChecked As Object
For Each itemChecked In CheckedListBox1.CheckedItems
str = itemChecked.item("sem1").ToString
Label1.Text = str
sql = "insert into pretab(pre) values('" + str + "')"
cmd.ExecuteNonQuery()
Next
conn.Close()
End Using
End Sub
What you need to do is before cmd.ExecuteNonQuery() you need to provide it a connection cmd.connection = connectionString
this will remove the cmd.ExecuteNonQuery() error.
Okay, so for a project I'm not allowed to use Datagridview and instead I'll have to use a Listbox to display data from a database when it is searched for. I'll link my code below, could anyone please tell me how I can change this code to suit a listbox. I'm a noob to programming so if I've made any obvious mistakes please forgive me
Imports System.Data
Imports System.Data.OleDb
Public Class frmUserList
Private Sub btnClose_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnClose.Click
Me.Close()
End Sub
Private Sub Load_Record()
Dim conn As New OleDbConnection
Dim cmd As New OleDbCommand
Dim da As New OleDbDataAdapter
Dim dt As New DataTable
Dim sSQL As String = String.Empty
'try catch block is used to catch the error
Try
'get connection string declared in the Module1.vb and assing it to conn variable
conn = New OleDbConnection(Get_Constring)
conn.Open()
cmd.Connection = conn
cmd.CommandType = CommandType.Text
sSQL = "SELECT user_id, last_name + ', ' + first_name + ' ' + mid_name as name FROM users where last_name + ', ' + first_name + ' ' + mid_name like '%" & Me.txtSearch.Text & "%' or [first_name] = '" & Me.txtSearch.Text & "'"
cmd.CommandText = sSQL
da.SelectCommand = cmd
da.Fill(dt)
Me.dtgResult.DataSource = dt
If dt.Rows.Count = 0 Then
MsgBox("No record found!")
End If
Catch ex As Exception
MsgBox(ErrorToString)
Finally
conn.Close()
End Try
End Sub
Private Sub btnSearch_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSearch.Click
Load_Record()
End Sub
Private Sub dtgResult_DoubleClick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles dtgResult.DoubleClick
If Me.dtgResult.SelectedRows.Count > 0 Then
Dim frm As New frmMarkSeat
frm.txtFname.Tag = Me.dtgResult.Item(0, Me.dtgResult.CurrentRow.Index).Value
frm.ShowDialog()
frm = Nothing
End If
End Sub
End Class
Give this a try using SQLDataReader: (untested code, just wrote out of hand).
'start here
conn.Connection.Open()
Dim sqlDR As SqlDataReader
Dim colValue As String
sqlDR = conn.ExecuteReader
While sqlDR.Read
colValue = (sqlDR.GetValue(0)).ToString
ItemlistBox.Items.Add(colValue)
ItemlistBox.Sorted = True
End While
conn.Connection.Close()
Or you can keep using your current objects, with additional object DataSet and populate the listbox.
Dim dtset As New DataSet
Dim da As New OleDbDataAdapter
da.Fill(dtset)
ItemListBox.DataSource = dtset
ItemListBox.DisplayMember = "ColName"