PL/SQL

From: Seema Singh <oracledbam_at_hotmail.com>
Date: Thu, 27 Jan 2005 10:49:26 -0500
Message-ID: <BAY19-F371D12DA5FF27891503291D3780@phx.gbl>

Hi,
I want to convert T-SQL query into oracle pl/sql.These query are uses Latitude and Longitude data for calculating near by destination and relevant information based on distance.

Here is 2 piece of code:

---

Stored procedure written in T-SQL script to calculate the distance in miles between 2 sets of decimal coordinates.

---

--RETURNS THE DISTANCE BETWEEN 2 SETS OF COORDINATES IN DECIMAL DEGREES
CREATE PROCEDURE [dbo].[spCalcDistance]
--_at_decSourceLat is the starting Lat

@decSourceLat decimal(12,8),
--_at_decSourceLon is the starting Lon

@decSourceLon decimal(12,8),
--_at_decDestLat is the destination Lat

@decDestLat decimal(12,8),
--_at_decDestLon is the destination Lon

@decDestLon decimal(12,8)
as

select cast(3958.75 * acos(round(sin(radians(@decSourceLat))   * 
sin(radians(@decDestLat)) + cos(radians(@decSourceLat))   * 
cos(radians(@decDestLat)) * cos(radians(@decDestLon)   - 

radians(@decSourceLon)), 10)) as int)

---

spRadiusSearch.sql : ( Stored proceedure written in T-SQL script for returning all points within a specified radiues )

---

--FINDS ALL CITIES WITHIN A SPECIFIED RADIUS FROM A STARTING POINT

--Assumes the source table name is City with at least the fields CategoryID,
Lat, and Lon
--Stored Procedure runs faster with the following indexes on the Lat and Lon
fields of table City
--CREATE INDEX [ndxLat] ON [dbo].[City] ([Lat]) WITH DROP_EXISTING ON
[PRIMARY]
--CREATE INDEX [ndxLon] ON [dbo].[City] ([Lon]) WITH DROP_EXISTING ON
[PRIMARY] CREATE PROCEDURE [dbo].[spRadiusSearch]
--_at_decSourceLat is the starting Lat

@decSourceLat decimal(12,8),
--_at_decSourceLon is the starting Lon

@decSourceLon decimal(12,8),
--_at_intRadius is how far out in miles we wish to seach
@intRadius int
as

--Define local vars for calculations

declare @decLatDiff decimal(12,8)
declare @decLonDiff decimal(12,8)

--Set rough estimate in degrees lat/lon for the radius
set @decLatDiff = @intRadius / 70.0
set @decLonDiff = @intRadius / 70.0

--Create temp table #Result to hold results
create table #Result (CategoryID int, Lat decimal(12, 8), Lon decimal(12,8), Distance int)

--Select into temp table #Result from Citiy all CategoryIDsthat fall within
the box defined with
--our source point at the center and plus/minus our lat and lon distances
north, south, east and west
insert into #Result
select C.CategoryID, C.Lat, C.Lon, -1.0
from City C with (nolock)
where C.Lat between (@decSourceLat - @decLatDiff) and (@decSourceLat + @decLatDiff)
and C.Lon between (@decSourceLon - @decLonDiff) and (@decSourceLon + @decLonDiff)

--Calculate the exact distance for each entry in #Result from our source ZIP
code
update #Result set
Distance = cast(3958.75 * acos(round(sin(radians(@decSourceLat)) * sin(radians(#Result.Lat)) + cos(radians(@decSourceLat)) * cos(radians(#Result.Lat)) * cos(radians(#Result.Lon) - radians(@decSourceLon)), 10)) as int)

--Remove any entries that fall outside our specified radius
delete #Result where #Result.Distance > @intRadius

--Select the distance from #Result and all matching records from City
select R.Distance, C.*
from City C with (nolock)
join #Result R on R.CategoryID = C.CategoryID order by R.Distance

--Drop temp #Result table

drop table #Result
GO

ANY THOUGHT WOULD BE HELPFULL.
thanks
-Seema

--

http://www.freelists.org/webpage/oracle-l Received on Thu Jan 27 2005 - 10:52:36 CST