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我試圖讓員工登錄,如果他們使用按鈕,保存用戶名和時間來保存多次不同的時間戳這樣的行:檢查輸入的值是否存在如果是防止保存它其他
現在我想,以防止用戶通過它們在數據庫進入考勤多次作出username
和comedata
之間的關係,以確保用戶只能每天簽上自己的出勤一次。
例
僞代碼:
If username = ComeForm_CGUserName_TextBox.Text
And CGComeDate = ComeForm_CGComeDate_DateTimePicker.Value
And username Is In DB And CGComeDate Is In DataBase
Then
MsgBox("You have already signed your attendace")
Else
Insert data into DataBase easy
End If
這就是我認爲它需要遵循,以防止在數據庫中的多個條目的邏輯。
,目前是完整的代碼ComeGo形式
Public Con As New SqlConnection("Data Source=(localdb)\ProjectsV13;Initial Catalog=Euro_SQL_Server;Integrated Security=True;Connect Timeout=30;Encrypt=False;TrustServerCertificate=True;ApplicationIntent=ReadWrite;MultiSubnetFailover=False")
Public ComeGoDT As New DataTable
Public ComeGoDA As New SqlDataAdapter
Public MyNewComeGoID As Integer
Public Sub Load_ComeGo()
ComeGoDT.Clear()
ComeGoDA = New SqlDataAdapter("select * from ComeGo", Con)
ComeGoDA.Fill(ComeGoDT)
End Sub
Public Sub Code_ComeGo()
Dim dt As New DataTable
Dim da As New SqlDataAdapter("select max(CGID) from ComeGo", Con)
da.Fill(dt)
If IsDBNull(dt(0)(0)) = True Then
MyNewComeGoID = 1
Else
MyNewComeGoID = dt(0)(0) + 1
End If
End Sub
Public Sub NewComeGo()
Code_ComeGo()
'Auto Generate EmployeesID
ComeForm_CGID_TextBox.Text = MyNewComeGoID
'Clearing Fields
ComeForm_CGComeDate_DateTimePicker.Value = Now.Date
ComeForm_CGComeTime_DateTimePicker.Value = Now
ComeForm_CGUserName_TextBox.Text = MangersMainMenu.MangersMainMenu_CurrentUserResult_Label.Text
ComeForm_CGNotes_TextBox.Text = ""
'Auto Generate ActionBy From Logged In UserFullName
ComeForm_ActionBy_TextBox.Text = MangersMainMenu.MangersMainMenu_CurrentUserResult_Label.Text
End Sub
Private Sub ComeForm_Load(sender As Object, e As EventArgs) Handles MyBase.Load
'Load EditComeGo_Form From EURO_DataBase
Load_ComeGo()
'Clear Fields
NewComeGo()
End Sub
Private Sub ComeForm_ComeSign_Button_Click(sender As Object, e As EventArgs) Handles ComeForm_ComeSign_Button.Click
'Definition Adding New ComeGo Method
ComeGoDT.Rows.Add()
Dim last As Integer = ComeGoDT.Rows.Count - 1
'Match Each Filed On The DataBase With There Filed On The Table
ComeGoDT.Rows(last).Item("CGID") = ComeForm_CGID_TextBox.Text
ComeGoDT.Rows(last).Item("CGDate") = Now.Date
ComeGoDT.Rows(last).Item("CGTime") = Now
ComeGoDT.Rows(last).Item("CGUserName") = MangersMainMenu.MangersMainMenu_CurrentUserResult_Label.Text
ComeGoDT.Rows(last).Item("CGComeDate") = ComeForm_CGComeDate_DateTimePicker.Value
ComeGoDT.Rows(last).Item("CGComeTime") = ComeForm_CGComeTime_DateTimePicker.Value
ComeGoDT.Rows(last).Item("CGNotes") = ComeForm_CGNotes_TextBox.Text
ComeGoDT.Rows(last).Item("ActionBy") = MangersMainMenu.MangersMainMenu_CurrentUserResult_Label.Text
'Definition Saving New Changes Method
Dim save As New SqlCommandBuilder(ComeGoDA)
'Refresh ComeGo DataBase Table
ComeGoDA.Update(ComeGoDT)
ComeGoDT.AcceptChanges()
'Show Massage Box
MsgBox("تم تسجيل حضور الموظف")
'Reload ComeGo Table With New UpDates
Load_ComeGo()
'Start New ComeGo Entery
NewComeGo()
End Sub
這是保存按鈕
Private Sub ComeForm_ComeSign_Button_Click(sender As Object, e As EventArgs) Handles ComeForm_ComeSign_Button.Click
'Definition Adding New ComeGo Method
ComeGoDT.Rows.Add()
Dim last As Integer = ComeGoDT.Rows.Count - 1
'Match Each Filed On The DataBase With There Filed On The Table
ComeGoDT.Rows(last).Item("CGID") = ComeForm_CGID_TextBox.Text
ComeGoDT.Rows(last).Item("CGDate") = Now.Date
ComeGoDT.Rows(last).Item("CGTime") = Now
ComeGoDT.Rows(last).Item("CGUserName") = MangersMainMenu.MangersMainMenu_CurrentUserResult_Label.Text
ComeGoDT.Rows(last).Item("CGComeDate") = ComeForm_CGComeDate_DateTimePicker.Value
ComeGoDT.Rows(last).Item("CGComeTime") = ComeForm_CGComeTime_DateTimePicker.Value
ComeGoDT.Rows(last).Item("CGNotes") = ComeForm_CGNotes_TextBox.Text
ComeGoDT.Rows(last).Item("ActionBy") = MangersMainMenu.MangersMainMenu_CurrentUserResult_Label.Text
'Definition Saving New Changes Method
Dim save As New SqlCommandBuilder(ComeGoDA)
'Refresh ComeGo DataBase Table
ComeGoDA.Update(ComeGoDT)
ComeGoDT.AcceptChanges()
'Show Massage Box
MsgBox("تم تسجيل حضور الموظف")
'Reload ComeGo Table With New UpDates
Load_ComeGo()
'Start New ComeGo Entery
NewComeGo()
End Sub