frmbooktypeedit.frm

这是用不VB+SQLSERVER2000开发的.

VERSION 5.00
Begin VB.Form FrmBookTypeEdit 
   BorderStyle     =   1  'Fixed Single
   Caption         =   "编辑图书分类信息"
   ClientHeight    =   2175
   ClientLeft      =   45
   ClientTop       =   330
   ClientWidth     =   4680
   Icon            =   "FrmBookTypeEdit.frx":0000
   LinkTopic       =   "Form1"
   MaxButton       =   0   'False
   MinButton       =   0   'False
   ScaleHeight     =   2175
   ScaleWidth      =   4680
   StartUpPosition =   2  '屏幕中心
   Begin VB.CommandButton Cmd_Cancel 
      Cancel          =   -1  'True
      Caption         =   "取 消"
      Height          =   400
      Left            =   2640
      MousePointer    =   99  'Custom
      Style           =   1  'Graphical
      TabIndex        =   2
      Top             =   1560
      Width           =   1300
   End
   Begin VB.CommandButton Cmd_Ok 
      Caption         =   "确 定"
      Height          =   400
      Left            =   888
      MousePointer    =   99  'Custom
      Style           =   1  'Graphical
      TabIndex        =   1
      Top             =   1560
      Width           =   1300
   End
   Begin VB.Frame Frame1 
      BackColor       =   &H80000004&
      Height          =   1335
      Left            =   240
      TabIndex        =   3
      Top             =   120
      Width           =   4215
      Begin VB.TextBox txtType 
         Height          =   270
         Left            =   1080
         MaxLength       =   20
         TabIndex        =   0
         Top             =   795
         Width           =   2895
      End
      Begin VB.Label lblUpper 
         AutoSize        =   -1  'True
         BackColor       =   &H00FFC0C0&
         BackStyle       =   0  'Transparent
         Caption         =   "lblUpper"
         Height          =   180
         Left            =   1080
         TabIndex        =   6
         Top             =   360
         Width           =   720
      End
      Begin VB.Label Label1 
         AutoSize        =   -1  'True
         BackColor       =   &H00FFC0C0&
         BackStyle       =   0  'Transparent
         Caption         =   "上级分类"
         Height          =   180
         Left            =   120
         TabIndex        =   5
         Top             =   360
         Width           =   720
      End
      Begin VB.Label Label2 
         AutoSize        =   -1  'True
         BackColor       =   &H00FFC0C0&
         BackStyle       =   0  'Transparent
         Caption         =   "分类名称"
         Height          =   180
         Left            =   120
         TabIndex        =   4
         Top             =   840
         Width           =   720
      End
   End
End
Attribute VB_Name = "FrmBookTypeEdit"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Public Modify As Boolean
Public TmpUId As Long

Private Sub Cmd_OK_Click()
  Dim Bh As Long
  '检查用户录入数据的有效性
  If Trim(txtType) = "" Then
    MsgBox "请输入图书分类名称"
    Exit Sub
  End If
  '将新输入的数据保存到类变量中
  With MyBookType
  .TypeName = MakeStr(txtType)
  '根据变量Modify决定是插入新数据，还是修改已有的数据
  If Modify = False Then '插入
    '调用In_DB()函数判断用户输入的名称是否已经存在
    If .In_DB(.TypeName) = True Then
      MsgBox Trim(txtType) + " 已经存在"
      Exit Sub
    End If
    'CurBookType中保存在图书分类管理窗体中选中的图书分类信息
    '当插入新记录时，新记录将做为当前图书分类的下级图书分类
    .UpperId = TmpUId
    Bh = .Insert
    '生成TreeView中一个结点的关键字
    Tmp_Key = "a" + Trim(Str(Bh))
    '设置结点的图像
    FrmBookType.TreeView1.SelectedItem.Image = 1
    FrmBookType.TreeView1.SelectedItem.ExpandedImage = 2
    FrmBookType.TreeView1.SelectedItem.SelectedImage = 3
    '在树中添加一个结点
    Set TmpNode = FrmBookType.TreeView1.Nodes.Add(FrmBookType.TreeView1.SelectedItem.Key, _
          tvwChild, Tmp_Key, .TypeName, 4, 5)
    TmpNode.Selected = True
  Else '修改
    If CurBookType.TypeName <> Trim(txtType) Then
      If .In_DB(Trim(txtType)) = True Then
        MsgBox Trim(txtType) + " 已经存在"
        Exit Sub
      End If
    End If
    '当修改记录时，不能改变上下级之间的关系
    .UpperId = CurBookType.UpperId
    .Update (CurBookType.TypeId)
    If CurBookType.TypeName <> Trim(txtType) Then
      FrmBookType.TreeView1.SelectedItem.Text = Trim(txtType)
    End If
    '设置CurBookType变量
    CurBookType.TypeName = Trim(txtType)
  End If
  End With
  '关闭窗口
  Unload Me
End Sub

Private Sub Cmd_Cancel_Click()
  Unload Me
End Sub

Private Sub txtType_KeyPress(KeyAscii As Integer)
  EnterTAB (KeyAscii)
End Sub