frmbookdelete.frm

用vb实现的图书管理系统

VERSION 5.00
Begin VB.Form frmBookDelete 
   Caption         =   "删除书籍信息"
   ClientHeight    =   2700
   ClientLeft      =   60
   ClientTop       =   450
   ClientWidth     =   4650
   LinkTopic       =   "Form7"
   ScaleHeight     =   2700
   ScaleWidth      =   4650
   StartUpPosition =   3  '窗口缺省
   Begin VB.CommandButton Command2 
      Caption         =   "退出"
      Height          =   495
      Left            =   2520
      TabIndex        =   3
      Top             =   1560
      Width           =   1095
   End
   Begin VB.CommandButton Command1 
      Caption         =   "确定"
      Height          =   495
      Left            =   960
      TabIndex        =   2
      Top             =   1560
      Width           =   1095
   End
   Begin VB.TextBox txtNumber 
      Height          =   375
      Left            =   960
      TabIndex        =   1
      Top             =   840
      Width           =   2415
   End
   Begin VB.Label Label1 
      Caption         =   "请输入你要删除的书的编号"
      Height          =   375
      Left            =   480
      TabIndex        =   0
      Top             =   240
      Width           =   2415
   End
End
Attribute VB_Name = "frmBookDelete"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Private Sub Command1_Click()
Dim conn As ADODB.Connection
Dim rs As New ADODB.Recordset
Dim sql As String

Dim N As Boolean
N = True
If Trim(txtNumber.Text) = "" Then
MsgBox "书籍编号不能为空", vbOKOnly + vbExclamation, ""
txtNumber.SetFocus
N = False
End If

If N = True Then
Set conn = New ADODB.Connection

conn.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=book.mdb;Persist Security Info=False"
conn.Open

sql = "select*from BookInfo where BookNumber = '"
sql = sql + txtNumber.Text + "'"
Set rs = conn.Execute(sql)
If rs.EOF Or rs.BOF Then
 MsgBox "书籍编号不存在，请检查！"
 
 N = False
 End If
 rs.Close
 End If
 If N = True Then
 rs.Open sql, conn, adOpenKeyset, adLockPessimistic
 rs.Delete
 rs.Update
 rs.Close
 MsgBox "删除书目成功!"
 End If
End Sub

Private Sub Command2_Click()
Unload Me

End Sub