图书管理系统ER图-流程图-功能结构图-源代码 第18页

VB+Access图书管理系统

Dim sql As String

On Error GoTo delerror

book_num = DataGrid1.Columns(3).CellValue(DataGrid1.Bookmark)

reader_num = DataGrid1.Columns(1).CellValue(DataGrid1.Bookmark)

answer = MsgBox("确定要还这本书吗？", vbYesNo, "")

If answer = vbYes Then

   sql = "select * from 借阅信息 where 书籍编号='" & book_num & "'"

   rs_back.CursorLocation = adUseClient

   rs_back.Open sql, conn, adOpenKeyset, adLockPessimistic

   rs_back.Delete

   rs_back.Update

   rs_back.Close

   sql = "select * from 书籍信息 where 书籍编号='" & book_num & "'"

   rs_back.CursorLocation = adUseClient

   rs_back.Open sql, conn, adOpenKeyset, adLockPessimistic

   rs_back.Fields(7) = "否"

   rs_back.Update

   rs_back.Close

   sql = "select * from 读者信息 where 读者编号='" & reader_num & "'"

   rs_back.CursorLocation = adUseClient

   rs_back.Open sql, conn, adOpenKeyset, adLockPessimistic

   rs_back.Fields(8) = rs_back.Fields(8) - 1

   rs_back.Update

   rs_back.Close

   If findform = True Then

      Command1_Click

   Else

      Command2_Click

   End If

   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

rs_reader.Close

sql = "select * from 借阅信息"

rs_book.CursorLocation = adUseClient

rs_book.Open sql, conn, adOpenKeyset, adLockPessimistic

If Not rs_book.EOF Then

   Do While Not rs_book.EOF

      Combo3.AddItem rs_book.Fields(3)

      Combo4.AddItem rs_book.Fields(4)

      rs_book.MoveNext

   Loop

End If

rs_book.Close

End Sub

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图书管理系统ER图-流程图-功能结构图-源代码 第18页下载如图片无法显示或论文不完整，请联系qq752018766