سلام
وقت بخیر
یک جدول مثالی: Requierments
Screenshot 2024-11-07 072729.png
برای لیست کردن همه زکوردها:
ابتدا یک تابع کلی دارم که می شه با اون رکوردهای همه جدول ها رو بر اساس نوع اون فراخوانی کنم:
Projects نام دیتابیس و نوع Entities هست:
Friend Shared Projects As New ProjectsEntities
Shared Function ProjectObjects(Of T)() As List(Of T)
Dim TypeName As String = GetType(T).Name
Dim QueryString As String =
String.Format("SELECT VALUE {0} FROM {0}", TypeName)
Return Projects.CreateQuery(Of T)(QueryString).ToList
End Function
کد کلی کلاس:
Imports System.Data.Objects
Class ApplicationData
Friend Shared Settings As New SettingsEntities
Friend Shared Projects As New ProjectsEntities
Shared Function ProjectObjects(Of T)() As List(Of T)
Dim TypeName As String = GetType(T).Name
Dim QueryString As String =
String.Format("SELECT VALUE {0} FROM {0}", TypeName)
Return Projects.CreateQuery(Of T)(QueryString).ToList
End Function
...
End Class
برای لیست کردن رکوردهای جدول از این کد استفاده کردم:
Dim Reqs As List(Of Requirements) =
ApplicationData.ProjectObjects(Of Requirements)()
برای حذف همه رکوردها هم از این روش استفاده کردم: (Console Application)
Protected Friend Shared Sub [Erase]()
Console.ForegroundColor = ConsoleColor.Red
Console.WriteLine("{0} Do you want to Erase All Requierments?", vbTab)
Console.ForegroundColor = ConsoleColor.White
Console.Write("{0} Type Y[es] to Accept: ", vbTab)
Console.ForegroundColor = ConsoleColor.Gray
Value = Console.ReadLine
If Value.Length = 0 Then Exit Sub
Select Case Value.Trim.ToLower
Case "y", "yes"
Dim Reqs As List(Of Requirements) =
ApplicationData.ProjectObjects(Of Requirements)()
For Each R As Requirements In Reqs
ApplicationData.Projects.DeleteObject(R)
Next
ApplicationData.Projects.SaveChanges()
Console.ForegroundColor = ConsoleColor.DarkGreen
Console.WriteLine("{0} All Requierments Erased Successful.", vbTab)
End Select
End Sub
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