the code is work but when the year changed the id fixed at 1 pls i need help
Public con As NewOleDbConnection(
"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" & My.Settings.ConStr & ";")
Public Function Max_id()
Dim mydate = Form6.DateTimePicker3.Value
Dim myyear = Year(mydate)
Dim n As Integer
If myyear = Now.Year Then
Dim cmd As New OleDbCommand("Select max(id) FROM table1", con)
con.Open()
Try
n = cmd.ExecuteScalar
Catch
n = 0
End Try
End If
If myyear > Now.Year Then
Try
n = cmd.ExecuteScalar
Catch
n = 0
End Try
End If
'End If
con.Close()
Return n
End Function
This code for inserting:
Public Sub INSERT_id(datee As Date)
Dim cmd As New OleDbCommand("Insert into table1(id,DATE_PIVIé) values(#id,#DATE_PIVIé)", con)
cmd.Parameters.Add("id", OleDbType.Integer).Value = Max_id() + 1
cmd.Parameters.Add("DATE_PIVIé", OleDbType.Date).Value = datee
con.Open()
cmd.ExecuteNonQuery()
con.Close()
End Sub
Related
I have a DataGridView and I'm adding a new row. But, when I add the new row it deletes the current row and replaces it.
This is the code
Try
con = New SqlConnection(cs)
con.Open()
cmd = New SqlCommand("SELECT ItemID, RTRIM(DishName),'1',Rate from Dish where ItemID like '" & TextBox1.Text & "' order by DishName", con)
rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection)
DataGridView1.Rows.Clear()
While (rdr.Read() = True)
DataGridView1.Rows.Add(rdr(0), rdr(1), rdr(2), rdr(3))
Dim num1 As Double
num1 = Val(DataGridView1.Rows(0).Cells("Qty").Value) * Val(DataGridView1.Rows(0).Cells("Rate").Value)
num1 = Math.Round(num1, 2)
DataGridView1.Rows(0).Cells("Amount").Value = num1
End While
TotalCalc()
Compute()
con.Close()
Catch ex As Exception
MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error)
End Try
I am having a little problem following your question
Suggestion Don't tell us you want a quick solution
If you are changing the value in the DB use Update
Here is some code to add values to a DataGridView with SQLite
The SELECT statement is a little odd due to another issue in my Project
Just use your SELECT also Welcome to Stackoverflow
Private Sub ViewSearches()
Dim intID As Integer
Dim strCodeDesc As String
Dim strUIProject As String
Dim strCodeType As String
Dim rowCount As Integer
Dim maxRowCount As Integer
Using conn As New SQLiteConnection($"Data Source = '{gv_dbName}';Version=3;")
conn.Open()
Using cmd As New SQLiteCommand("", conn)
If gvTxType = "View" Then
cmd.CommandText = "SELECT * FROM CodeTable WHERE cvCodeType = #site"
cmd.Parameters.Add("#site", DbType.String).Value = gvSCT
ElseIf gvTxType = "All" Then
cmd.CommandText = "SELECT * FROM CodeTable"
End If
Using rdr As SQLite.SQLiteDataReader = cmd.ExecuteReader
While rdr.Read()
intID = CInt((rdr("CID")))
strCodeDesc = rdr("cvCodeDesc").ToString
strUIProject = rdr("cvUIProject").ToString
strCodeType = rdr("cvCodeType").ToString
dgvSelCode.Rows.Add(intID, strCodeDesc, strUIProject, strCodeType)
rowCount += 1
End While
dgvSelCode.Sort(dgvSelCode.Columns(3), ListSortDirection.Ascending)
End Using
If rowCount <= 12 Then
maxRowCount = 12 - rowCount
For iA = 1 To maxRowCount
dgvSelCode.Rows.Add(" ")
Next
End If
End Using
End Using
End Sub
Hello I have a simple method to update customer details in one of my database tables however when i try to update it an error occurs saying the database is locked. I have no idea how to fix this because my add and delete queries work just fine.
This is the error message:
System.Data.SQLite.SQLiteException: 'database is locked
database is locked'
Public Sub updateguest(ByVal sql As String)
Try
con.Open()
With cmd
.CommandText = sql
.Connection = con
End With
result = cmd.ExecuteNonQuery
If result > 0 Then
MsgBox("NEW RECORD HAS BEEN UPDATED!")
con.Close()
Else
MsgBox("NO RECORD HASS BEEN UPDATDD!")
End If
Catch ex As Exception
MsgBox(ex.Message)
Finally
con.Close()
End Try
End Sub
Private Sub IbtnUpdate_Click(sender As Object, e As EventArgs) Handles ibtnUpdate.Click
Dim usql As String = "UPDATE Customers SET fname = '" & txtFName.Text & "'" & "WHERE CustomerID ='" & txtSearchID.Text & "'"
updateguest(usql)
End Sub
Private Sub IbtnSearch_Click(sender As Object, e As EventArgs) Handles ibtnSearch.Click
Dim sSQL As String
Dim newds As New DataSet
Dim newdt As New DataTable
Dim msql, msql1 As String
Dim con As New SQLiteConnection(ConnectionString)
con.Open()
msql = "SELECT * FROM Customers Where Fname Like '" & txtSearchName.Text & "%'"
msql1 = "SELECT * FROM Customers Where CustomerID '" & txtSearchID.Text & "'"
Dim cmd As New SQLiteCommand(msql, con)
Dim cmd1 As New SQLiteCommand(msql1, con)
Dim dt = GetSearchResults(txtSearchName.Text)
dgvCustomerInfo.DataSource = dt
Dim mdr As SQLiteDataReader = cmd.ExecuteReader()
If mdr.Read() Then
If txtSearchName.Text <> "" Then
sSQL = "SELECT * FROM customers WHERE fname LIKE'" & txtSearchName.Text & "%'"
Dim con1 As New SQLiteConnection(ConnectionString)
Dim cmd2 As New SQLiteCommand(sSQL, con1)
con1.Open()
Dim da As New SQLiteDataAdapter(cmd2)
da.Fill(newds, "customers")
newdt = newds.Tables(0)
If newdt.Rows.Count > 0 Then
ToTextbox(newdt)
End If
dgvCustomerInfo.DataSource = newdt
con1.Close()
txtSearchID.Clear()
ElseIf txtSearchID.Text <> "" Then
sSQL = "SELECT * FROM customers WHERE CustomerID ='" & txtSearchID.Text & "'"
Dim con2 As New SQLiteConnection(ConnectionString)
Dim cmd2 As New SQLiteCommand(sSQL, con2)
con2.Open()
Dim da As New SQLiteDataAdapter(cmd2)
da.Fill(newds, "customers")
newdt = newds.Tables(0)
If newdt.Rows.Count > 0 Then
ToTextbox(newdt)
End If
dgvCustomerInfo.DataSource = newdt
con2.Close()
txtSearchName.Clear()
End If
Else
MsgBox("No data found")
End If
End Sub
Private Sub IbtnDelete_Click(sender As Object, e As EventArgs) Handles ibtnDelete.Click
Dim dsql As String = "DELETE FROM customers WHERE customerid = " & txtSearchID.Text & ""
deleteme(dsql)
updatedgv(dgvCustomerInfo)
txtSearchID.Clear()
txtSearchName.Clear()
End Sub
Public Sub deleteme(ByVal sql As String)
Try
con.Open()
With cmd
.CommandText = sql
.Connection = con
End With
result = cmd.ExecuteNonQuery
If result > 0 Then
MsgBox("NEW RECORD HAS BEEN DELTED!")
con.Close()
Else
MsgBox("NO RECORD HASS BEEN DELTED!")
End If
Catch ex As Exception
MsgBox(ex.Message)
Finally
con.Close()
End Try
End Sub
You made a good start on keeping your database code separate from you user interface code. However, any message boxes should be shown in the user interface and any sql statements should be written in the data access code.
I used Using...End Using blocks to ensure that database objects are closed and disposed. I used parameters to protect against sql injection. I am not too sure of the mapping of DbType types to Sqlite types. You might have to fool with that a bit. In you original Update statement you had the ID value in quotes. This would pass a string. When you use parameters, you don't have to worry about that or ampersands and double quotes. Just one clean string.
Private ConStr As String = "Your connection string"
Public Function updateguest(FirstName As String, ID As Integer) As Integer
Dim Result As Integer
Dim usql As String = "UPDATE Customers SET fname = #fname WHERE CustomerID = #ID;"
Using con As New SQLiteConnection(ConStr),
cmd As New SQLiteCommand(usql, con)
cmd.Parameters.Add("#fname", DbType.String).Value = FirstName
cmd.Parameters.Add("#ID", DbType.Int32).Value = ID
con.Open()
Result = cmd.ExecuteNonQuery
End Using
Return Result
End Function
Private Sub IbtnUpdate_Click(sender As Object, e As EventArgs) Handles ibtnUpdate.Click
Try
Dim Result = updateguest(txtFName.Text, CInt(txtSearchID.Text))
If Result > 0 Then
MsgBox("New RECORD HAS BEEN UPDATED!")
Else
MsgBox("NO RECORD HAS BEEN UPDATDD!")
End If
Catch ex As Exception
MsgBox(ex.Message)
End Try
End Sub
I want to Auto Increment the ID when I am adding new data to excel and this codes doesn't Auto Increment it's Only increment by 2 and i can't understand why please helpp thankssss
Dim Value As Integer
cn = New OleDb.OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + "C:\\Users\\Barbatos\\Desktop\\Book3.xlsx " + ";Extended Properties=Excel 12.0;")
cm = New OleDbCommand("SELECT MAX ([ID]) FROM [Sheet1$]", cn)
cn.Open()
Dim dr As OleDbDataReader = cm.ExecuteReader()
If dr.HasRows Then
dr.Read()
Value = dr(0)
Else
End If
dr.Close()
Dim str As String
Dim empid As Integer
Dim newNumber As Integer
str = "SELECT MAX([ID]) AS MAXIMUM FROM [Sheet1$]"
Dim cmd2 As OleDbCommand = New OleDbCommand(str, cn)
'Dim dr As OleDbDataReader
dr = cmd2.ExecuteReader
If dr.HasRows Then
While dr.Read()
If empid = IsDBNull(dr("MAXIMUM")) Then
newNumber = CInt(Val(empid)) + 1
End If
If newNumber = 0 Then
newNumber = 1
empid = CStr(newNumber)
ElseIf newNumber = 1 Then
newNumber = newNumber + 1
empid = CStr(newNumber)
Else
newNumber = newNumber + 1
empid = CStr(newNumber)
End If
End While
End If
dr.Close()
Me.Label2.Text = empid
To summarise my comments, I'd be doing this:
Dim nextId As Integer
Using connection As New OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\\Users\\Barbatos\\Desktop\\Book3.xlsx;Extended Properties=Excel 12.0;"),
command As New OleDbCommand("SELECT MAX([ID]) FROM [Sheet1$]", connection)
connection.Open()
Dim currentId = command.ExecuteScalar()
nextId = If(currentId Is DBNull.Value, 1, CInt(currentId) + 1)
End Using
or, if it's supported, this:
Dim nextId As Integer
Using connection As New OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\\Users\\Barbatos\\Desktop\\Book3.xlsx;Extended Properties=Excel 12.0;"),
command As New OleDbCommand("SELECT ISNULL(MAX([ID]), 0) FROM [Sheet1$]", connection)
connection.Open()
nextId = CInt(command.ExecuteScalar()) + 1
End Using
SOlVED
If dr.HasRows Then
dr.Read()
If IsDBNull(dr("MAXIMUM")) Then
empid = 1
Else
empid = CInt(dr("MAXIMUM")) + 1
End If
Else
empid = 1
End If
I am creating a pageant scoring system,
I have this functions for populating my datagridview's first column using query:
Public Sub searchContestant()
If comboCategory.SelectedIndex <> 0 Then
Dim id As Integer = Login.JudgeBindingSource1.Current("Cont_id")
Dim critID As Integer = Convert.ToInt32(lblID.Text)
'search the contest record by the contest_id
Dim con As New SqlConnection
Dim reader As SqlDataReader
Dim reader2 As SqlDataReader
Dim dt = New DataTable()
Dim nc As New DataGridViewTextBoxColumn
DataGridView1.Columns.Clear()
DataGridView1.Rows.Clear()
Try
con.ConnectionString = "Data Source=BROWNIE\SQLEXPRESS;Initial Catalog=PSS;Integrated Security=True"
Dim cmd As New SqlCommand("SELECT * from Criteria where Cat_id = '" & critID & "' ", con)
Dim cmd2 As New SqlCommand("SELECT * from Contestant where Cont_id = '" & id.ToString() & "' ", con)
con.Open()
' Execute Query
reader = cmd.ExecuteReader()
nc.Name = "Contestants"
nc.Width = 250
nc.ReadOnly = True
DataGridView1.Columns.Add(nc)
While reader.Read()
nc = New DataGridViewTextBoxColumn
nc.Name = "(" & reader.GetString(2) & "%)" & reader.GetString(1)
nc.HeaderText = "(" & reader.GetString(2) & "%)" & reader.GetString(1)
nc.Width = 150
DataGridView1.Columns.Add(nc)
End While
Catch ex As Exception
MessageBox.Show("Error while connecting to SQL Server." & ex.Message)
Finally
con.Close() 'Whether there is error or not. Close the connection. '
End Try
Try
'populate contestant rows
con.ConnectionString = "Data Source=BROWNIE\SQLEXPRESS;Initial Catalog=PSS;Integrated Security=True"
Dim cmd2 As New SqlCommand("SELECT * from Contestant where Cont_id = '" & id.ToString() & "' ", con)
con.Open()
reader2 = cmd2.ExecuteReader()
While reader2.Read()
nc = New DataGridViewTextBoxColumn
nc.Width = 100
DataGridView1.Rows.Add(reader2.GetString(2).ToString())
End While
Catch ex As Exception
MessageBox.Show("Error while connecting to SQL Server." & ex.Message)
Finally
con.Close() 'Whether there is error or not. Close the connection. '
End Try
End If
End Sub
And for succeeding columns :
Public Sub searchCriteria()
Dim con As New SqlConnection
Dim reader4 As SqlDataReader
Dim dt = New DataTable()
Dim nc As New DataGridViewTextBoxColumn
DataGridView1.Columns.Clear()
Try
'populate Criteria
con.ConnectionString = "Data Source=BROWNIE\SQLEXPRESS;Initial Catalog=PSS;Integrated Security=True"
Dim cmd As New SqlCommand("SELECT * from Criteria where Cat_id = '" & lblID.Text & "' ", con)
con.Open()
reader4 = cmd.ExecuteReader
While reader4.Read
nc = New DataGridViewTextBoxColumn
nc.Name = reader4.GetString(1).ToString & Chr(13) & reader4.GetString(2).ToString & "%"
nc.Width = 100
DataGridView1.Columns.Add(nc)
End While
Catch ex As Exception
MessageBox.Show("Error while connecting to SQL Server." & ex.Message)
Finally
con.Close() 'Whether there is error or not. Close the connection. '
End Try
End Sub
This is the output:
And everytime a judge login, I insert data into the system with this function:
Public Sub makeTransaction()
Dim con2 As New SqlConnection
'get the judge id upon logging in
Dim judgeID = Login.JudgeBindingSource1.Current("Judge_id")
'get the contest id of the judge
Me.JudgeTableAdapter.FillByJudgeID(Me.PSSDataSet.Judge, judgeID)
Dim JudgeContestid = Login.JudgeBindingSource1.Current("Cont_id")
Me.ContestantTableAdapter.FillByContestID(Me.PSSDataSet.Contestant, JudgeContestid)
'get the contestant id
Me.ContestTableAdapter.FillByContestID(Me.PSSDataSet.Contest, JudgeContestid)
Dim contestID As Integer = ContestBindingSource.Current("Cont_id")
'get the category of the contest
Me.CategoryTableAdapter.FillByContestID(Me.PSSDataSet.Category, Convert.ToInt32(contestID))
For Each Category As DataRow In Me.PSSDataSet.Category.Rows
Me.CriteriaTableAdapter.FillByCategoryID(Me.PSSDataSet.Criteria, Category("Cat_id"))
For Each Contestant As DataRow In Me.PSSDataSet.Contestant.Rows
For Each Criteria As DataRow In Me.PSSDataSet.Criteria.Rows
TransactionsTableAdapter.Insert(JudgeContestid, Contestant("Con_id"), Criteria("Cri_id"), 0)
Next
Next
Next
End Sub
Now my problem is, how can I populate the datagrid using the data recently made by MakeTransaction() function?
I am retrieving records from a database with the following code.
Dim SearchID As Integer = teacherID
Dim NewStudentID As Integer = studentID
Dim DisplayTable As New DataTable()
Dim da As New OleDbDataAdapter()
Dim sqlquery As String = ("select * from tblAppointments WHERE TeacherID =" & teacherID & "")
If conn.State = ConnectionState.Closed Then
conn.Open()
End If
Try
da.SelectCommand = New OleDbCommand(sqlquery, conn)
da.Fill(Finalds, "Display")
DisplayTable = Finalds.Tables("Display")
DisplayTable.Columns.Remove("Instrument")
DisplayTable.Columns.Remove("Room")
DisplayTable.Columns.Remove("TeacherID")
Registersgridview.DataSource = DisplayTable
Registersgridview.Columns(0).Visible = False
conn.Close()
Catch ex As Exception
MsgBox("There are no appointments in the database for " + Tutorcombox.Text)
End Try
It also there then added to a datagridview and certain columns are removed and some are hidden aswell.
Because its essentially a register, when the use clicks on the datagridview field that is a boolean it changes from false to true. I have been trying to send this back to the database, but have had no luck. I have tried the following :
Dim dt As DataTable = New DataTable("SendTable")
Dim row As DataRow
dt.Columns.Add("appID", Type.GetType("System.Int32"))
dt.Columns.Add("Present", Type.GetType("System.Boolean"))
For i = 0 To Registersgridview.Rows.Count - 1
row = dt.Rows.Add
row.Item("appID") = Registersgridview.Rows(i).Cells(0)
row.Item("Present") = Registersgridview.Rows(i).Cells(5)
Next
If conn.State = ConnectionState.Closed Then
conn.Open()
End If
Dim sqlquery As String = "Update tblAppointments SET Present = #Present WHERE appID = #appID"
Dim sqlcommand As New OleDbCommand
For Each newrow As DataRow In dt.Rows
With sqlcommand
.CommandText = sqlquery
.Parameters.AddWithValue("#Present", newrow.Item(1))
.Parameters.AddWithValue("#appID", newrow.Item(0))
.ExecuteNonQuery()
End With
conn.Close()
Next
But have had no luck with doing so, as it crashes without an error.
Can anyone help?
I solved the problem myself, if any of you are having similar problems here is the solution
Dim dt As DataTable = New DataTable("SendTable")
Dim row As DataRow
dt.Columns.Add("appID", Type.GetType("System.Int32"))
dt.Columns.Add("Present", Type.GetType("System.Boolean"))
For i = 0 To Registersgridview.Rows.Count - 1
Dim appID As Integer = Registersgridview.Rows(i).Cells(0).Value
Dim present As Boolean = Registersgridview.Rows(i).Cells(4).Value
row = dt.Rows.Add
row.Item("appID") = appID
row.Item("Present") = present
Next
If conn.State = ConnectionState.Closed Then
conn.Open()
End If
Dim sqlquery As String = "UPDATE tblAppointments SET Present = #Present WHERE appID = #appID"
Dim sqlcommand As New OleDbCommand
For Each newrow As DataRow In dt.Rows
With sqlcommand
.CommandText = sqlquery
.Parameters.AddWithValue("#Present", newrow.Item(1))
.Parameters.AddWithValue("#appID", newrow.Item(0))
.Connection = conn
.ExecuteNonQuery()
End With
Next
conn.Close()
Registersgridview.DataSource = Nothing
dt.Clear()
try this:
Dim dt As DataTable = New DataTable("SendTable")
Dim row As DataRow
dt.Columns.Add("appID", Type.GetType("System.Int32"))
dt.Columns.Add("Present", Type.GetType("System.Boolean"))
For i = 0 To Registersgridview.Rows.Count - 1
row = dt.Rows.Add
row.Item("appID") = Registersgridview.Rows(i).Cells(0)
row.Item("Present") = Registersgridview.Rows(i).Cells(5)
Next
If conn.State = ConnectionState.Closed Then
conn.Open()
End If
Dim sqlquery As String = "Update tblAppointments SET Present = #Present WHERE appID = #appID"
Dim sqlcommand As New OleDbCommand
For Each newrow As DataRow In dt.Rows
With sqlcommand
.CommandText = sqlquery
.Parameters.AddWithValue("#Present", newrow.Item(5))
.Parameters.AddWithValue("#appID", newrow.Item(0))
.ExecuteNonQuery()
End With
conn.Close()
Next