deletedb.frm

这是我们公司的题库管理系统

VERSION 5.00
Begin VB.Form DeleteDB 
   Caption         =   "删除试题数据库"
   ClientHeight    =   1725
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   5085
   LinkTopic       =   "Form1"
   ScaleHeight     =   1725
   ScaleWidth      =   5085
   StartUpPosition =   2  '屏幕中心
   Begin VB.CommandButton cmdExit 
      Cancel          =   -1  'True
      Caption         =   "关闭"
      Height          =   315
      Left            =   2775
      TabIndex        =   3
      Top             =   990
      Width           =   930
   End
   Begin VB.CommandButton cmdDelete 
      Caption         =   "删除"
      Default         =   -1  'True
      Height          =   315
      Left            =   1425
      TabIndex        =   2
      Top             =   1005
      Width           =   930
   End
   Begin VB.ComboBox cmbDB 
      Height          =   300
      Left            =   1590
      Style           =   2  'Dropdown List
      TabIndex        =   1
      Top             =   405
      Width           =   2925
   End
   Begin VB.Label Label1 
      AutoSize        =   -1  'True
      Caption         =   "选择数据库"
      Height          =   180
      Left            =   570
      TabIndex        =   0
      Top             =   465
      Width           =   900
   End
End
Attribute VB_Name = "DeleteDB"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False

Private Sub cmdDelete_Click()
    '删除选中的数据库
    On Error GoTo DealError
    n = MsgBox("是否删除数据库“" & cmbDB & "”?", vbQuestion + vbYesNo)
    If n = vbYes Then
        Dim objCn As New Connection
        With objCn                                      '建立服务器连接
            .Provider = "SQLOLEDB"
            .ConnectionString = "User ID=sa;PWD=123;Server=(local)"
            .Open                                        '打开连接
        End With
        strSQL = "drop database " & cmbDB
        objCn.Execute strSQL
        MsgBox "数据库已被成功删除！", vbInformation
        If ThisDBName = cmbDB Then ThisDBName = ""
        cmbDB.RemoveItem cmbDB.ListIndex
        If cmbDB.ListCount > 0 Then
            cmbDB.ListIndex = 0
        Else
            cmdDelete.Enabled = False
        End If
        objCn.Close
        Set objRs = Nothing
        Exit Sub
    End If
DealError:
    ShowError "程序执行出错，错误信息如下：" & vbCrLf & Err.Description
End Sub

Private Sub cmdExit_Click()
    Unload Me               '关闭窗体
End Sub

Private Sub Form_Load()
    On Error GoTo DealError
    Dim objCn As New Connection
    With objCn                                      '建立服务器连接
        .Provider = "SQLOLEDB"
        .ConnectionString = "User ID=sa;PWD=123;Server=(local);database=master"
        .Open                                        '打开连接
    End With
    Dim objRs As New Recordset
    Set objRs.ActiveConnection = objCn
    objRs.CursorLocation = adUseClient
    strSQL = "select name from sysdatabases"
    objRs.Open strSQL
    If objRs.RecordCount <= 4 Then
        MsgBox "无数据库可删除！", vbInformation
        cmdDelete.Enabled = False
    Else
        objRs.Move 4, adBookmarkFirst
        For i = 5 To objRs.RecordCount
            cmbDB.AddItem objRs!Name
            objRs.MoveNext
        Next
        cmbDB.ListIndex = 0
    End If
    objCn.Close
    Set objRs = Nothing
    Set objCn = Nothing
    Exit Sub
DealError:
    ShowError "程序执行出错，错误信息如下：" & vbCrLf & Err.Description
End Sub