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实例编程:Access新手来看

Jun 07, 2016 pm 03:02 PM
access Example newbie programming chat record explain

述:以一段聊天记录来解释实际生活中编号的定义方法以及误区 问题: 我跟你说说我这边的情况吧。好像工号03-0756-004-1JF,表示:03表示03年生产,0756是合同号,004表示对方单位的编号,1表示合同的第几项,JF是表示车间。你说这样的工号会不会很烦? 回

述:以一段聊天记录来解释实际生活中编号的定义方法以及误区
  问题:
  我跟你说说我这边的情况吧。好像工号03-0756-004-1JF,表示:03表示03年生产,0756是合同号,004表示对方单位的编号,1表示合同的第几项,JF是表示车间。你说这样的工号会不会很烦?
  回答:
  我只能说,你在设计数据结构的时候就已经错误了。
  很多程序员认为 “编号”是一个字段,在计算机中这的确是正确的,但是,在计算机中,编号是没有含义的,没有语法、没有组合、没有任何意义,仅表示记录的唯一标识。而实际生产中,编号往往包含很多意义(除非你使用数据库查询系统来管理随机编号)。因此就像你说的,编号的每个部分都有含义。所以,应该以每个部分为最小单位来建立数据库结构。简单的说,就是 生产日期、合同号、对方单位编号、车间分几个字段存储,这也可以说是“原子性”扩展。其实 SQL 不仅仅可以查询数据,还可以组织数据,比如
  select 日期 & 合同号 & 单位号 & 车间 as 编号,全名 from 产品表
  问题:
  但很惨的是:录入员已经习惯很连续地录入03-0456-002-4JF这样的工号了,叫他们分开来录入,恐怕很麻烦。
  回答:
  你可以在保存按钮上写点代码切分数据,即使连续窗体也可以在 BEFOREUPDATE事件里面写代码。代码可以类似:
  Sub SplitString()
  Dim strA() As String
  strA() = Split(Me.TextBoxA, "-")
  Dim i As Integer
  For i = 0 To UBound(strA)
  Debug.Print strA(i)
  Me("TextBox" & i).value=strA(i)
  Next
  End Sub
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