通过 DAO 记录集返回随机记录

时　间:2021-08-27 19:53:56
作　者:杨雪   ID：42182  城市：南京
摘　要:Access 没有从一组记录返回随机记录的内置机制。 本主题介绍一个用户定义的示例函数，您可以使用该函数返回一个随机记录。
正　文:

截   图:

源   码:

Private Sub 部门名称_Click()
    MsgBox FindRandom("部门", "部门名称")
End Sub



Function FindRandom(RecordSetName As String, Fieldname As String)

    Dim MyDB As Database
    Dim MyRS As Recordset
    Dim SpecificRecord As Long, i As Long, NumOfRecords As Long

    Set MyDB = CurrentDb()
    Set MyRS = MyDB.OpenRecordset(RecordSetName, dbOpenDynaset)
    On Error GoTo NoRecords
    MyRS.MoveLast
    NumOfRecords = MyRS.RecordCount
    SpecificRecord = Int(NumOfRecords * Rnd)
    If SpecificRecord = NumOfRecords Then
        SpecificRecord = SpecificRecord - 1
    End If
    MyRS.MoveFirst
    For i = 1 To SpecificRecord
        MyRS.MoveNext
    Next i
    FindRandom = MyRS(Fieldname)
    Exit Function

NoRecords:
    If Err = 3021 Then
        MsgBox "There Are No Records In The Dynaset", 16, "Error"
    Else
        MsgBox "Error - " & Err & Chr$(13) & Chr$(10) & Error, _
               16, "Error"
    End If
    FindRandom = "No Records"
    Exit Function

End Function