form2.frm

以上所有操作应用程序及数据库均要对其进行合法性有效性验证及相关约束条件检查

VERSION 5.00
Begin VB.Form 图书馆借书 
   Caption         =   "图书馆借书系统"
   ClientHeight    =   8385
   ClientLeft      =   165
   ClientTop       =   855
   ClientWidth     =   10740
   LinkTopic       =   "Form2"
   ScaleHeight     =   8385
   ScaleWidth      =   10740
   StartUpPosition =   3  '窗口缺省
   Begin VB.CommandButton Command2 
      Caption         =   "退出"
      Height          =   735
      Left            =   3840
      TabIndex        =   3
      Top             =   3120
      Width           =   1935
   End
   Begin VB.CommandButton Command1 
      Caption         =   "确定"
      Height          =   735
      Left            =   1080
      TabIndex        =   2
      Top             =   3120
      Width           =   2055
   End
   Begin VB.TextBox Text2 
      Height          =   735
      Left            =   3720
      TabIndex        =   1
      Top             =   1920
      Width           =   2175
   End
   Begin VB.TextBox Text1 
      Height          =   735
      Left            =   960
      TabIndex        =   0
      Top             =   1920
      Width           =   2055
   End
   Begin VB.Label Label3 
      Caption         =   "书籍编号"
      Height          =   615
      Left            =   3720
      TabIndex        =   6
      Top             =   1320
      Width           =   2055
   End
   Begin VB.Label Label2 
      Caption         =   "图书证号"
      Height          =   495
      Left            =   960
      TabIndex        =   5
      Top             =   1320
      Width           =   2055
   End
   Begin VB.Label Label1 
      Caption         =   "图书馆借书系统"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   18
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   615
      Left            =   960
      TabIndex        =   4
      Top             =   120
      Width           =   4455
   End
   Begin VB.Menu QUERY 
      Caption         =   "图书查询"
   End
   Begin VB.Menu ReturnBook 
      Caption         =   "还书系统"
   End
   Begin VB.Menu COUNT 
      Caption         =   "统计借书情况"
   End
   Begin VB.Menu Modify 
      Caption         =   "修改密码"
   End
   Begin VB.Menu SET 
      Caption         =   "管理员设置"
   End
   Begin VB.Menu Exit 
      Caption         =   "退出"
   End
End
Attribute VB_Name = "图书馆借书"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Dim ADORS1 As New ADODB.Recordset
Dim ADORS2 As New ADODB.Recordset
Private Sub Command1_Click()
Dim STR1 As String    '要执行的SQL语句
Dim STR2 As String
Dim str As String

STR1 = Trim(Text1.Text)
STR2 = Trim(Text2.Text)

r = 1
If Not ADORS1.BOF Then
    ADORS1.MoveFirst
    While Not ADORS1.EOF And r = 1
        If Trim(ADORS1.Fields("door_no").Value) = Trim(Text1.Text) Then
            r = 0
        Else
            ADORS1.MoveNext
        End If
    Wend
    If r = 1 Then
         MsgBox "无此用户"
    Exit Sub
    End If
Else
    MsgBox "无此用户"
    Exit Sub
End If
        
        
r = 1
If Not ADORS2.BOF Then
    ADORS2.MoveFirst
    While Not ADORS2.EOF And r = 1
        If Trim(ADORS2.Fields("isbn").Value) = Trim(Text2.Text) Then
            r = 0
            If Trim(ADORS2.Fields("yijie")) <> "否" Then
                MsgBox "该书已借"
                Exit Sub
            End If
        Else
            ADORS2.MoveNext
        End If
    Wend
    If r = 1 Then
         MsgBox "无此书"
    Exit Sub
    End If
Else
    MsgBox "无此书"
    Exit Sub
End If


str = "select * from borrower_books where door_no='" + Trim(Text1.Text) + "'"
ExecSql (str)

If adoRs.RecordCount < Maxbooks Then
    i = EXECInsert2(STR1, STR2, Returnbooks)
    ADORS2.Fields("yijie").Value = "是"
    ADORS2.Update
    MsgBox "借书成功"
Else
    str = "已超过" & Maxbooks & "本,不能再借"
    MsgBox str, 48
End If



End Sub

Private Sub Command2_Click()
Unload Me
End Sub

Private Sub COUNT_Click()
统计.Show
End Sub

Private Sub Exit_Click()
Unload Me
End Sub

Private Sub Form_Load()


Dim str As String
Dim STR1 As String    '要执行的SQL语句
Dim STR2 As String

STR1 = "select door_no from student_books "
If ADORS1.State = adStateOpen Then
ADORS1.Close
End If
ADORS1.Open STR1, Aconnection, adOpenKeyset, adLockOptimistic

If ADORS2.State = adStateOpen Then
ADORS2.Close
End If
STR2 = "select isbn,yijie from library_books "
ADORS2.Open STR2, Aconnection, adOpenKeyset, adLockOptimistic



  str = "select * from LIB"
ExecSql (str)

Maxbooks = Val(adoRs.Fields("maxbooks").Value)
Returnbooks = adoRs.Fields("returnbooks").Value
Call EXECommand2
End Sub

Private Sub Modify_Click()
修改密码.Show
End Sub

Private Sub QUERY_Click()
查询.Show
End Sub

Private Sub ReturnBook_Click()
还书系统.Show
End Sub

Private Sub SET_Click()
设置.Show
End Sub