VB+图书管理系统的设计与实现(八)

VB+图书管理系统的设计与实现(八) sh
 DataGrid1.AllowAddNew = False
 DataGrid1.AllowUpdate = False
 Command2.Enabled = True
 Command3.Enabled = True
 Command4.Enabled = False
 Command5.Enabled = False
 End Sub
 
 Private Sub Form_Load()
 Command4.Enabled = False
 DataGrid1.AllowAddNew = False
 DataGrid1.AllowDelete = False
 DataGrid1.AllowUpdate = False
 If userpow = "guest" Then
 Frame2.Enabled = False
 End If
 Exit Sub
 loaderror:
 MsgBox Err.Description
 End Sub
 
 Private Sub Form_Unload(Cancel As Integer)
 Set DataGrid1.DataSource = Nothing
 End Sub

窗体名：Form7
代码：
 Private Sub Command1_Click()
 Dim rs_findreader As New ADODB.Recordset
 Dim sql As String
 If Check1.Value = vbChecked Then
 sql = "读者编号='" & Trim(Text1.Text & " ") & "'"
 End If
 If Check2.Value = vbChecked Then
 If Trim(sql) = "" Then
 sql = "读者姓名='" & Trim(Text2.Text & " ") & "'"
 Else
 sql = sql & "and 读者姓名='" & Trim(Text2.Text & " ") & "'"
 End If
 End If
 If Check3.Value = vbChecked Then
 If Trim(sql) = "" Then
 sql = "读者类别='" & Trim(Combo1.Text & " ") & "'"
 Else
 sql = sql & "and 读者类别='" & Trim(Combo1.Text & " ") & "'"
 End If
 End If
 If Trim(sql) = "" Then
 MsgBox "请选择查询方式!", vbOKOnly + vbExclamation
 Exit Sub
 End If
 Adodc1.RecordSource = "select * from dzxx where " & sql
 Adodc1.Refresh
 DataGrid1.ReBind
 DataGrid1.AllowAddNew = False
 DataGrid1.AllowDelete = False
 DataGrid1.AllowUpdate = False
 
 End Sub
 
 Private Sub Command2_Click()
 Unload Me
 End Sub
 
 Private Sub Form_Load()
 Dim i As Integer
 Dim sql As String
 Combo1.Clear
 Adodc2.Recordset.MoveFirst
 For i = 0 To Adodc2.Recordset.RecordCount - 1
 Combo1.AddItem Adodc2.Recordset.Fields(0).Value
 Adodc2.Recordset.MoveNext
 Next
 Combo1.ListIndex = 0
 End Sub
 
窗体名：Form8
代码：
 Private Sub Combo1_Change()
 Combo2.ListIndex = Combo1.ListIndex
 End Sub
 
 Private Sub Combo2_Change()
 Combo1.ListIndex = Combo2.ListIndex
 End Sub
 Option Explicit
 Dim leibie As String
 Dim qixian As Integer
 Dim shumn As Integer
 Dim maxnum As Integer
 
 Private Sub Command1_Click()
 Dim rs_borrowbook As New ADODB.Recordset
 Dim sql As String
 Adodc1.RecordSource = "select * from 读者信息 where 读者编号='" & Combo1.Text & ","
 Adodc1.Refresh
 leibie = Adodc1.Recordset.Fields(3)
 shumu = Adodc1.Recordset.Fields(8)
 Adodc1.RecordSource = "select * from 读者类别 where 种类名称='" & leibie & "'"
 Adodc1.Refresh
 qixian = Adodc1.Recordset.Fields(2)
 maxnum = Adodc1.Recordset.Fields(1)
 If shumu >= maxnum Then
 MsgBox "该读者借书数额已满!", vbOKOnly + vbExclamation
 Exit Sub
 End Sub
 
 Private Sub Command2_Click()
 Unload Me
 End

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