VB+图书管理系统的设计与实现(六)

VB+图书管理系统的设计与实现(六) bsp;Else
 sql = sql & "and 书名='" & Trim(Combo1.Text & "'") & "'"
 End If
 End If
 If Check3.Value = vbcheckde Then
 If Trim(sql) = "" Then
 sql = "作者='" & Trim(Text2.Text & " ") & "'"
 Else
 sql = sql & "and 作者='" & Trim(Text2.Text & " ") & "'"
 End If
 End If
 If Check4.Value = vbChecked Then
 If Trim(sql) = "" Then
 sql = "出版社='" & Trim(Text3.Text & " ") & "'"
 Else
 sql = sql & "and 出版社='" & Trim(Text3.Text & " ") & "'"
 End If
 End If
 If Check5.Value = vbChecked Then
 If Trim(sql) = "" Then
 sql = "书籍编号='" & Trim(Text4.Text & " ") & "'"
 Else
 sql = sql & "and 书籍编号='" & Trim(Text4.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 sjxx where " & sql
 Adodc1.Refresh
 DataGrid1.AllowAddNew = False
 DataGrid1.AllowDelete = False
 DataGrid1.AllowUpdate = False
 End Sub
 
 Private Sub Command2_Click()
 Unload Me
 End Sub
 
 Private Sub Command3_Click()
 If Trim(book_num) = "" Then
 MsgBox "请选择要借阅的图书!", vbOKOnly + vbExclamation
 Exit Sub
 End If
 If panduan = "是" Then
 MsgBox "此书已被借出!", vbOKOnly + vbExclamation
 Exit Sub
 End If
 Form9.Show
 End Sub
 Private Sub DataGrid1_RowColChange(LastRow As Variant, ByVal LastCol As Integer)
 If Not Adodc1.Recordset.EOF And Adodc1.Recordset.EOF Then
 book_num = DataGrid1.Columns(0).CellValue(DataGrid1.Bookmark)
 panduan = DataGrid1.Columns(7).CellValue(DataGrid1.Bookmark)
 End If
 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：Form5
代码：
 Private Sub Command1_Click()
 On Error GoTo command1error
 Command2.Enabled = False
 Command3.Enabled = False
 Command4.Enabled = True
 Command5.Enabled = True
 DataGrid1.AllowAddNew = True
 DataGrid1.AllowUpdate = True
 Exit Sub
 commanderror:
 MsgBox Err.Description
 End Sub
 
 Private Sub Command2_Click()
 On Error GoTo Command2
 Command1.Enabled = False
 Command2.Enabled = False
 Command3.Enabled = False
 Command4.Enabled = True
 Command5.Enabled = True
 DataGrid1.AllowUpdate = True
 Command2:
 If Err.Number <> 0 Then
 MsgBox Err.Description
 End If
 End Sub
 
 Private Sub Command3_Click()
 Dim answer As String
 On Error GoTo command3error
 answer = MsgBox("确定要删除吗?", vbYesNo, "")
 If answer = vbYes Then
 Adodc1.Recordset.Delete
 Adodc1.Recordset.MoveNext
 If Adodc1.Rec

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