关于客户端用ASP参生报表（高级篇）

March 25,2004

上回曾贴一篇较简单的用ASP＋RDS客户端参生报表
此回贴一篇较复杂的用ASP＋RDS＋组件客户端参生报表
错误说明：(若提示ActiveX 元件无法参生 RDS.DataSpace)
IE需设置安全选项
操作：菜单工具->INTERNET选项->安全性->自定义
设置：起始但ActiveX不标示为安全->开启
原理说明：
客户端直接用RDS产生RecordSet安全性不够，使用了
middle-tier Automation components 后可大大增加安全性！
请看下文：
编写注册元件：
ActiveX Dll project:iacrdsobj.vbp
Class Module name:RsOp

Public Function ReturnRs(strDB As Variant, strSQL As Variant) As ADODB.Recordset
      'Returns an ADODB recordset.
      On Error GoTo ehGetRecordset
      Dim cn As New ADODB.Connection
      Dim rs As New ADODB.Recordset
      Dim strConnect As String
      strConnect = "Provider=SQLOLEDB;Server=server name ;uid=sa;pwd=; Database=" & strDB & ";"
      cn.Open strConnect
      'These are not listed in the typelib.
      rs.CursorLocation = adUseClient
      'Using the Unspecified parameters, an ADO/R recordset is returned.
      rs.Open strSQL, cn, adOpenUnspecified, adLockUnspecified, adCmdUnspecified
      Set ReturnRs = rs
   Exit Function
ehGetRecordset:
      Err.Raise Err.Number, Err.Source, Err.Description
   End Function
然后 MAKE iacrdsobj.dll
若有错，请设置VB菜单PROJECT－REFREENCE
增加 MicroSoft ActiveX Data Object 2.6 Library(当然数字要高一点)

然后注册iacrdsobj.dll到数据库server(为安全，最好更改数据库uid最好不为sa)！
好，接下来看asp
long1.asp
<html>
<head>
<META content="text/html; charset=gb2312" http-equiv=Content-Type>
<title>client use rds produce excel report</title>
</head>
<body bgColor=skyblue topMargin=5 leftMargin="20" oncontextmenu="return false" rightMargin=0 bottomMargin="0">

<div align="center"><center>
<table border="1" bgcolor="#ffe4b5" style="HEIGHT: 1px; TOP: 0px" bordercolor="#0000ff">
<tr>
      <td align="middle" bgcolor="#ffffff" bordercolor="#000080">
      <font color="#000080" size="3">
      client use rds produce excel report
      </font>
      </td>
</tr>
</table>
</div>
<form action="long1.asp" method="post" name="myform">
<DIV align=left>
<input type="button" value="Query Data" name="query"  language="vbscript" onclick="fun_excel(1)"  style="HEIGHT: 32px; WIDTH: 90px">
<input type="button" value="Clear Data" name="Clear"  language="vbscript" onclick="fun_excel(2)"  style="HEIGHT: 32px; WIDTH: 90px">
<input type="button" value="Excel Report" name="report" language="vbscript" onclick="fun_excel(3)"  style="HEIGHT: 32px; WIDTH: 90px">
</div>
<DIV id="adddata"></div>
</form>
</body>
</html>
<script language="vbscript">
sub fun_excel(t)
Dim rds,rs,df,ServerStr
dim strSQL,StrRs
Dim xlApp, xlBook, xlSheet1
ServerStr="http://Sql Server Name" 'the sql server name of register iacRDSObj.dll
'use rds to produce client recordset
set rds = CreateObject("RDS.DataSpace",ServerStr)
'eg:set rds = CreateObject("RDS.DataSpace","http://iac_fa")  'iac_fa is the LAN sql server name
'eg:set rds = CreateObject("RDS.DataSpace","http://10.150.254.102") '10.150.254.102 is the LAN sql server IP Address
'the register com
Set df = rds.CreateObject("iacRDSObj.rsop", ServerStr)
'the query string of sql
strSQL = "Select top 8 * from jobs order by job_id"
'the recordset
Set rs = df.ReturnRs("pubs",strSQL)
if t=1 then
   if not rs.eof then
      StrRs="<table border=1><tr><td>job_id</td><td>job_desc</td><td>max_lvl</td><td>min_lvl</td></tr><tr><td>"+ rs.GetString(,,"</td><td>","</td></tr><tr><td>"," ") +"</td></tr></table>"
      adddata.innerHTML=StrRs
      StrRs=""
   else
      msgbox "No data in the table!"
   end if
elseif t=2 then
      StrRs=""
      adddata.innerHTML=StrRs
elseif t=3 then
   Set xlApp = CreateObject("EXCEL.APPLICATION")
   Set xlBook = xlApp.Workbooks.Add
   Set xlSheet1 = xlBook.Worksheets(1)
   xlSheet1.cells(1,1).value ="the job  table "
   xlSheet1.range("A1:D1").merge
   xlSheet1.cells(2,1).value = "job_id"
   xlSheet1.cells(2,2).value = "job_desc"
   xlSheet1.cells(2,3).value = "max_lvl"
   xlSheet1.cells(2,4).value = "min_lvl"
   cnt = 3
'adapt to office 97 and 2000
   do while not rs.eof
      xlSheet1.cells(cnt,1).value = rs("job_id")
      xlSheet1.cells(cnt,2).value = rs("job_desc")
      xlSheet1.cells(cnt,3).value = rs("max_lvl")
      xlSheet1.cells(cnt,4).value = rs("min_lvl")
      rs.movenext
      cnt = cint(cnt) + 1
   loop
   xlSheet1.Application.Visible = True

'adapt to office 2000 only
      'xlSheet1.Range("A3").CopyFromRecordset rs
      'xlSheet1.Application.Visible = True
end if
rs.close
set rs=nothing
end sub
</script>