vb操作sql数据库的典型例子

本程序有一菜单开始，里面有查询，删除，修改，添加，程序不一一列出，只写出基本的过程，连接数据库采用标准模块：
'Public publicstr As String
Public conn As ADODB.Connection
Public rs As ADODB.Recordset
Public Sub main()     '数据库连接共享函数
  Set conn = New ADODB.Connection
  conn.Open "Provider=MSDASQL.1;Persist Security Info=False;User ID=sa;Data Source=plgl;Initial Catalog=plgl"
  'publicstr = "Provider=MSDASQL.1;Persist Security Info=False;User ID=sa;Data Source=plgl;Initial Catalog=plgl"     '共享连接字符串
  main_pfm.Show
End Sub
添加程序：
  Set rs = New ADODB.Recordset
  If Trim(Text1(0).Text) = "" Then
    smeg = "配方号不能为空！！！"
    MsgBox smeg, vbOKCancel + vbExclamation, "警告"
    Text1(0).SetFocus
  Else
  If Not IsNumeric(Text1(0).Text) Then
          smeg = "A添加剂非数字！！！"
          MsgBox smeg, vbOKCancel + vbExclamation, "警告"
          Text1(0).Text = ""
          Text1(0).SetFocus
    Else
    If Trim(Text1(1).Text) = "" Then
      smeg = "配方名称不能为空！！！"
      MsgBox smeg, vbOKCancel + vbExclamation, "警告"
      Text1(1).SetFocus
    Else
      If Trim(Text1(2).Text) = "" Then
        smeg = "A添加剂不能为空！！！"
        MsgBox smeg, vbOKCancel + vbExclamation, "警告"
        Text1(2).SetFocus
      Else
        If Not IsNumeric(Text1(2).Text) Then
      &n