frmbookreturnupdate.frm

用vb实现的图书管理系统

VERSION 5.00
Begin VB.Form frmBookReturnUpdate 
   Caption         =   "书籍还入信息删除"
   ClientHeight    =   4380
   ClientLeft      =   60
   ClientTop       =   450
   ClientWidth     =   6120
   LinkTopic       =   "Form12"
   ScaleHeight     =   4380
   ScaleWidth      =   6120
   StartUpPosition =   3  '窗口缺省
   Begin VB.CommandButton Command3 
      Caption         =   "删除"
      Height          =   375
      Left            =   2400
      TabIndex        =   11
      Top             =   3720
      Width           =   1095
   End
   Begin VB.CommandButton Command2 
      Caption         =   "退出"
      Height          =   375
      Left            =   4440
      TabIndex        =   10
      Top             =   3720
      Width           =   1095
   End
   Begin VB.CommandButton Command1 
      Caption         =   "清空"
      Height          =   375
      Left            =   480
      TabIndex        =   9
      Top             =   3720
      Width           =   1095
   End
   Begin VB.TextBox txtBookName 
      Height          =   375
      Left            =   3120
      TabIndex        =   8
      Top             =   1560
      Width           =   2415
   End
   Begin VB.TextBox txtDate 
      Height          =   375
      Left            =   3120
      TabIndex        =   7
      Top             =   2160
      Width           =   2415
   End
   Begin VB.TextBox txtMemo 
      Height          =   375
      Left            =   3120
      TabIndex        =   6
      Top             =   2760
      Width           =   2415
   End
   Begin VB.TextBox txtName 
      Height          =   390
      Left            =   3120
      TabIndex        =   5
      Top             =   960
      Width           =   2415
   End
   Begin VB.Label Label6 
      Caption         =   "书名"
      Height          =   255
      Left            =   360
      TabIndex        =   4
      Top             =   1680
      Width           =   2175
   End
   Begin VB.Label Label4 
      Caption         =   "还书日期"
      Height          =   255
      Left            =   360
      TabIndex        =   3
      Top             =   2280
      Width           =   2175
   End
   Begin VB.Label Label3 
      Caption         =   "备注"
      Height          =   255
      Left            =   360
      TabIndex        =   2
      Top             =   2880
      Width           =   2175
   End
   Begin VB.Label Label2 
      Caption         =   "借阅者姓名"
      Height          =   255
      Left            =   360
      TabIndex        =   1
      Top             =   1080
      Width           =   2175
   End
   Begin VB.Label Label1 
      Caption         =   "输入借阅者姓名或书名点击确定，将调出此书相关信息"
      Height          =   375
      Left            =   360
      TabIndex        =   0
      Top             =   240
      Width           =   5175
   End
End
Attribute VB_Name = "frmBookReturnUpdate"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Private Sub Command1_Click()
txtName.Text = ""
txtBookName.Text = ""
txtDate.Text = ""
txtMemo.Text = ""
End Sub

Private Sub Command2_Click()
Unload Me

End Sub

Private Sub Command3_Click()
Dim conn As ADODB.Connection
Dim rs As New ADODB.Recordset
Dim sql As String
Dim N As Boolean
N = True
Set conn = New ADODB.Connection
conn.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=book.mdb;Persist Security Info=False"
conn.Open
If Trim(txtName.Text) = "" Then
MsgBox "还书者姓名不能为空", vbOKOnly + vbExclamation, ""
txtName.SetFocus
N = False
End If
If Trim(txtBookName.Text) = "" Then
MsgBox "书名不能为空", vbOKOnly + vbExclamation, ""
N = False
End If
If Trim(txtDate.Text) = "" Then
MsgBox "日期不能为空", vbOKOnly + vbExclamation, ""
txtDate.SetFocus
N = False
End If
If N = True Then
sql = "select * from ReturnInfo where UserName ='" + txtName.Text + "'and BookName='" + txtBookName.Text + "'and Date='" + txtDate.Text + "'"
rs.Open sql, conn, adOpenKeyset, adLockPessimistic
If Not rs.EOF Then
rs.Delete
rs.Update
MsgBox "书籍还入信息已经删除", vbOKOnly + vbExclamation, ""
Else
MsgBox "书籍还入信息不存在", vbOKOnly + vbExclamation, ""
End If
End If
End Sub