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09.11.2008 at 08:30AM PDT, ID: 23723315
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8.2

I need to set up a proximity query to an access database containing longitude, latitude, and related XAxis, YAxis and ZAxis data, from an sql query in an asp page

Asked by SimonMen in SQL Query Syntax, Microsoft Access Database, Active Server Pages (ASP)

Tags:

I can do this in MS SQL which accepts the acos function following the tutorial at this link  http://msdn.microsoft.com/en-us/library/ms980211.aspx, however I need to provide an option in using Microsoft Access - ie the asp page brings up the results from an access database as opposed to a database running MS SQL 2005.

I essentially need to construct a query which replaces acos in the following, for something acceptable to access 2003 - the tables are small, maybe at most 100 records at a time.  

select *,  ProxDistance = @EarthRadius * acos( XAxis*@CntXAxis +
  YAxis*@CntYAxis + ZAxis*@CntZAxis)
from  [TABLENAME]
where  @EarthRadius * acos
( XAxis*@CntXAxis + YAxis*@CntYAxis +
  ZAxis*@CntZAxis) <= @SearchDistance
order by ProxDistance ASC


acos is the problem for access.

The variables (eg @CntXAxis) are established in the asp page using another table with the centre points already calculated.

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<%@LANGUAGE="VBSCRIPT" CODEPAGE="65001"%>
<!--#include file="Connections/conDH.asp" -->
<!--#include file="Connections/conGD_Network.asp" -->
<%
' this contains the centre point data relating to a property development - so the development has longitude, latitude, xaxis, yaxis, zaxis fields
Dim rsDev__MMColParam
rsDev__MMColParam = "1"
If (Request.QueryString("DevID") <> "") Then 
  rsDev__MMColParam = Request.QueryString("DevID")
End If
%>
<%
Dim rsDev
Dim rsDev_cmd
Dim rsDev_numRows
 
Set rsDev_cmd = Server.CreateObject ("ADODB.Command")
rsDev_cmd.ActiveConnection = MM_conDH_STRING
rsDev_cmd.CommandText = "SELECT * FROM tbl_NewDev WHERE (tbl_NewDev.DevID = ?))" 
rsDev_cmd.Prepared = true
rsDev_cmd.Parameters.Append rsDev_cmd.CreateParameter("param1", 5, 1, -1, rsDev__MMColParam) ' adDouble
 
Set rsDev = rsDev_cmd.Execute
rsDev_numRows = 0
%>
<%
 
' sets up the variables for using in the sql query
  Dim Str_EarthRadius
  Dim Str_XAxis
  Dim Str_YAxis
  Dim Str_ZAxis
  Dim Str_Distance
  
  Str_EarthRadius = 3961
  Str_XAxis = rsDev.Fields.Item("XAxis").Value
  Str_YAxis = rsDev.Fields.Item("YAxis").Value
  Str_ZAxis = rsDev.Fields.Item("ZAxis").Value
  Str_Distance = 100
  
  
%>
 
<%
 
' sets up the proximity results
Dim rsLinks
Dim rsLinks_cmd
Dim rsLinks_numRows
 
Set rsLinks_cmd = Server.CreateObject ("ADODB.Command")
rsLinks_cmd.ActiveConnection = MM_conGD_Network_STRING
rsLinks_cmd.CommandText = "SELECT *,  ProxDistance = "&str_EarthRadius&" * ACos( XAxis* "&str_XAxis&" +  YAxis*"&str_YAxis&" + ZAxis*"&str_ZAxis&") from  tbl_Links where  "&str_EarthRadius&" * ACos( XAxis* "&str_XAxis&" + YAxis* "&str_YAxis&" +    ZAxis*"&str_ZAxis&") <= "&str_Distance&" ORDER BY CompanyName ASC" 
rsLinks_cmd.Prepared = true
 
Set rsLinks = rsLinks_cmd.Execute
rsLinks_numRows = 0
%>
[+][-]09.11.2008 at 08:46AM PDT, ID: 22451176

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[+][-]09.11.2008 at 08:55AM PDT, ID: 22451264

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[+][-]09.11.2008 at 09:05AM PDT, ID: 22451379

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[+][-]09.16.2008 at 08:57AM PDT, ID: 22489919

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About this solution

Zones: SQL Query Syntax, Microsoft Access Database, Active Server Pages (ASP)
Tags: asp vbscript and access
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Solution Provided By: SimonMen
Participating Experts: 1
Solution Grade: A
 
 
 
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