frmmodicourse.frm

大学数据库原理的课程设计

VERSION 5.00
Object = "{67397AA1-7FB1-11D0-B148-00A0C922E820}#6.0#0"; "MSADODC.OCX"
Begin VB.Form frmModiCourse 
   BorderStyle     =   1  'Fixed Single
   Caption         =   "修改课程"
   ClientHeight    =   2265
   ClientLeft      =   2460
   ClientTop       =   2430
   ClientWidth     =   5175
   LinkTopic       =   "Form1"
   MaxButton       =   0   'False
   MinButton       =   0   'False
   ScaleHeight     =   2265
   ScaleWidth      =   5175
   Begin MSAdodcLib.Adodc adoEdit 
      Align           =   2  'Align Bottom
      Height          =   375
      Left            =   0
      Top             =   1890
      Width           =   5175
      _ExtentX        =   9128
      _ExtentY        =   661
      ConnectMode     =   0
      CursorLocation  =   3
      IsolationLevel  =   -1
      ConnectionTimeout=   15
      CommandTimeout  =   30
      CursorType      =   3
      LockType        =   3
      CommandType     =   8
      CursorOptions   =   0
      CacheSize       =   50
      MaxRecords      =   0
      BOFAction       =   0
      EOFAction       =   0
      ConnectStringType=   1
      Appearance      =   1
      BackColor       =   -2147483643
      ForeColor       =   -2147483640
      Orientation     =   0
      Enabled         =   -1
      Connect         =   "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=Stud97.mdb;Persist Security Info=False"
      OLEDBString     =   "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=Stud97.mdb;Persist Security Info=False"
      OLEDBFile       =   ""
      DataSourceName  =   ""
      OtherAttributes =   ""
      UserName        =   ""
      Password        =   ""
      RecordSource    =   "SELECT * FROM 课程信息 ORDER BY 课号"
      Caption         =   "Adodc1"
      BeginProperty Font {0BE35203-8F91-11CE-9DE3-00AA004BB851} 
         Name            =   "宋体"
         Size            =   9
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      _Version        =   393216
   End
   Begin VB.Frame Frame1 
      Caption         =   "修改课程"
      Height          =   1215
      Left            =   600
      TabIndex        =   5
      Top             =   120
      Width           =   3975
      Begin VB.TextBox txtCourseNo 
         DataField       =   "课号"
         DataSource      =   "adoEdit"
         Height          =   264
         Left            =   1320
         TabIndex        =   7
         Top             =   360
         Width           =   2055
      End
      Begin VB.TextBox txtCourseName 
         DataField       =   "课程"
         DataSource      =   "adoEdit"
         Height          =   264
         Left            =   1320
         TabIndex        =   6
         Top             =   720
         Width           =   2055
      End
      Begin VB.Label Label1 
         AutoSize        =   -1  'True
         Caption         =   "课程编号"
         Height          =   180
         Left            =   480
         TabIndex        =   9
         Top             =   405
         Width           =   720
      End
      Begin VB.Label Label2 
         AutoSize        =   -1  'True
         Caption         =   "课程名称"
         Height          =   180
         Left            =   480
         TabIndex        =   8
         Top             =   765
         Width           =   720
      End
   End
   Begin VB.CommandButton cmdEdit 
      Caption         =   "修改记录"
      Height          =   312
      Left            =   60
      TabIndex        =   4
      Top             =   1610
      Width           =   972
   End
   Begin VB.CommandButton cmdUpdate 
      Caption         =   "更新数据"
      Height          =   312
      Left            =   1080
      TabIndex        =   3
      Top             =   1610
      Width           =   972
   End
   Begin VB.CommandButton cmdCancel 
      Caption         =   "取消修改"
      Height          =   312
      Left            =   2100
      TabIndex        =   2
      Top             =   1610
      Width           =   972
   End
   Begin VB.CommandButton cmdDelect 
      Caption         =   "删除记录"
      Height          =   312
      Left            =   3120
      TabIndex        =   1
      Top             =   1610
      Width           =   972
   End
   Begin VB.CommandButton cmdExit 
      Caption         =   "退出"
      Height          =   312
      Left            =   4140
      TabIndex        =   0
      Top             =   1610
      Width           =   972
   End
End
Attribute VB_Name = "frmModiCourse"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
'修改课程窗体frmModiCourse
Option Explicit

Private Sub adoEdit_MoveComplete(ByVal adReason As ADODB.EventReasonEnum, _
        ByVal pError As ADODB.Error, adStatus As ADODB.EventStatusEnum, _
        ByVal pRecordset As ADODB.Recordset)
    '显示当前记录位置/总记录数
    adoEdit.Caption = "Record: " & _
        CStr(adoEdit.Recordset.AbsolutePosition) & _
        "/" & adoEdit.Recordset.RecordCount
End Sub

Private Sub cmdCancel_Click() '取消
    With adoEdit.Recordset
        .CancelUpdate '取消更新
        .MoveNext
        .MovePrevious
    End With
    Call MyLock(True)
End Sub

Private Sub cmdDelect_Click() '删除
    Dim Response As Integer
    Response = MsgBox("删除当前记录吗？", vbQuestion + vbYesNo, "询问")
    If Response = vbYes Then
        With adoEdit.Recordset
            .Delete
            .MoveNext
            If .EOF Then .MoveLast
        End With
    End If
End Sub

Private Sub cmdEdit_Click() '修改
    Call MyLock(False)
End Sub

Private Sub cmdExit_Click()
    Unload Me
End Sub

Private Sub cmdUpdate_Click() '更新
    On Error Resume Next
    
    '各文本框若为空白，提示重新输入
    If Trim$(txtCourseNo.Text) = "" Then
        MsgBox "请输入课程编号！", vbExclamation
        txtCourseNo.SetFocus
        Exit Sub
    End If
    If Trim$(txtCourseName.Text) = "" Then
        MsgBox "请输入课程名称！", vbExclamation
        txtCourseName.SetFocus
        Exit Sub
    End If

    adoEdit.Recordset.Update  '更新数据库
    
    If Err = -2147467259 Then '该错误号为主键重复错误
        MsgBox "课程编号重复，请重新输入！", vbExclamation
        With txtCourseNo                 '焦点返回课号框
            .SelStart = 0
            .SelLength = Len(.Text)
            .SetFocus
        End With
        Exit Sub
    End If
    
    MsgBox "课程信息已成功修改！", vbInformation
    
    Call MyLock(True) '锁定
End Sub

Private Sub Form_Initialize()
    ChDrive App.Path
    ChDir App.Path
End Sub

Private Sub Form_Load()
    Call MyLock(True)
End Sub

Private Sub Form_Unload(Cancel As Integer) '窗体卸载时
    frmMain.Show
End Sub

Private Sub MyLock(ByVal bLock As Boolean) '自定义过程：锁定/解锁用于输入的控件
    txtCourseNo.Locked = bLock 'True
    txtCourseName.Locked = bLock 'True
    cmdEdit.Enabled = bLock 'True
    cmdCancel.Enabled = Not bLock 'False
    cmdUpdate.Enabled = Not bLock 'False
    adoEdit.Enabled = bLock 'True
End Sub