VB图书管理系统毕业论文 第13页

VB图书管理系统毕业论文 第13页
 cmdcancel.Enabled = False
   cmdupdate.Enabled = False
End Sub
Private Sub cmddel_Click()
Dim answer As String
On Error GoTo delerror
answer = MsgBox("确定要删除吗？", vbYesNo, "")
If answer = vbYes Then
   DataGrid1.AllowDelete = True
   rs_reader.Delete
   rs_reader.Update
   DataGrid1.Refresh
   MsgBox "成功删除！", vbOKOnly + vbExclamation, ""
   DataGrid1.AllowDelete = False
Else
   Exit Sub
End If
delerror:
If Err.Number <> 0 Then
   MsgBox Err.Description
End If
End Sub
Private Sub cmdmodify_Click()
Dim answer As String
On Error GoTo cmdmodify
cmddel.Enabled = False
cmdmodify.Enabled = False
cmdupdate.Enabled = True
cmdcancel.Enabled = True
DataGrid1.AllowUpdate = True
cmdmodify:
If Err.Number <> 0 Then
   MsgBox Err.Description
End If
End Sub
Private Sub Command5_Click()
rs_reader.Update
DataGrid1.Refresh
End Sub
Private Sub cmdupdate_Click()
If Not IsNull(DataGrid1.Bookmark) Then
   rs_reader.Update
End If
   cmdmodify.Enabled = True
   cmddel.Enabled = True
   cmdcancel.Enabled = False
   cmdupdate.Enabled = False
   DataGrid1.AllowUpdate = False
   MsgBox "保存成功！", vbOKOnly + vbExclamation, ""
End Sub
Private Sub Command1_Click()
www.751com.cn
Dim sql As String
On Error GoTo loaderror
sql = "select * from 读者类别"
rs_reader.CursorLocation = adUseClient
rs_reader.Open sql, conn, adOpenKeyset, adLockPessimistic     '打开数据库
cmdupdate.Enabled = False
'设定datagrid控件属性
DataGrid1.AllowAddNew = False                                 '不可增加
DataGrid1.AllowDelete = False                                 '不可删除
DataGrid1.AllowUpdate = False
If userpow = "guest" Then                                     '权限相关
   Frame2.Enabled = False
End If
Set DataGrid1.DataSource = rs_reader
'cmdcancel.Enabled = False
Exit Sub
loaderror:
   MsgBox Err.Description
End Sub
Private Sub Form_Unload(Cancel As Integer)
Set DataGrid1.DataSource = Nothing
rs_reader.Close
End Sub
9、文件名frmaddreaderinfo（frmaddreaderinfo.frm）
功能说明：添加读者信息，包括读者的姓名、性别、读者类别、登记日期、电话号码、工作单位、家庭地址等信息。
源代码：
Option Explicit
Dim rs_addreader As New ADODB.Recordset
Private Sub Command1_Click()
Dim sql As String
If Trim(Combo1.Text) = "" Then
   MsgBox "请选择读者种类", vbOKOnly + vbExclamation, ""
   Combo1.SetFocus
   Exit Sub
End If
If Trim(Text1.Text) = "" Then
   MsgBox "读者姓名不能为空", vbOKOnly + vbExclamation, ""
   Text1.SetFocus
   Exit Sub
End If
If Trim(Text2.Text) = "" Then
   MsgBox "读者编号不能为空", vbOKOnly + vbExclamation, ""
   Text2.SetFocus
   Exit Sub
End If
sql = "select * from 读者信息 where 读者编号='" & Text2.Text & "'"
rs_addreader.Open sql, conn, adOpenKeyset, adLockPessimistic
If rs_addreader.EOF Then
   rs_addreader.AddNew
   rs_addreader.Fields(0) = Trim(Text1.Text)
   rs_addreader.Fields(1) = Trim(Text2.Text)
   rs_addreader.Fields(2) = Trim(Combo2.Text)
   rs_addreader.Fields(3) = Trim(Combo1.Text)
   rs_addreader.Fields(4) = Trim(Text3.Text)
   rs_addreader.Fields(5) = Trim(Text4.Text)
   rs_addreader.Fields(6) = Trim(Text5.Text)
   rs_addreader.Fields(7) = CDate(Text6.Text)

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