首先，现有系统上有现成的坐标存储（节选）

Id          Name                             Longitude                               Latitude
----------- -------------------------------- --------------------------------------- ---------------------------------------
1           梧州南站                             111.215417                              23.397750
2           龙腾金院                             111.216583                              23.400806
3           中团变电站                            111.224861                              23.404806
4           龙圩大转盘西                           111.234417                              23.406611
5           龙圩大转盘北                           111.236500                              23.407444
6           龙城龙兴路口                           111.237917                              23.413500
7           龙城银兴路口                           111.240389                              23.416861
8           政贤路广场                            111.242611                              23.418167
9           苍梧大道东                            111.247167                              23.418611
10          恩义小学                             111.257139                              23.428861

现在需要查找给定坐标最近的站点

这里采用SQL2008以上版本提供的geography解法

1、在表中添加一个geography类型的列，名为 [GeoLocation]

ALTER TABLE [dbo].T_L_Station
ADD [GeoLocation] GEOGRAPHY
GO

2、把 [Latitude] 和 [Longitude] 的数字类型保存的经纬度坐标点，转换并更新到 [GeoLocation] 列中

UPDATE [dbo].T_L_Station
SET [GeoLocation] = geography::Point([Latitude], [Longitude], 4326)
GO

3、Select * 一下，便可以睇到数据库中存储的空间结果

4、采用 geography 类型内置的 STDistance 函数便可以求出，与已知坐标的距离了，在where order by一下就可以得到想要的结果喇，参考代码

SELECT  [Id]
      ,[Name]
      ,[ByStartDistance]
      ,[Longitude]
      ,[Latitude]
      ,[GeoLocation]
	  ,[GeoLocation].STDistance(geography::Point(23.47303, 111.32033, 4326)) as 距离
  FROM [dbo].[T_L_Station]
  --where [GeoLocation].STDistance(geography::Point(23.47303, 111.32033, 4326))<=200
  order by 距离

PS：23.47303, 111.32033 为已知坐标的经纬度。

这样是不是很简单：）

我把程序中的Entity Framework的SQL2012的数据库转为SQL2005后

出现了错误：

The version of SQL Server in use does not support datatype 'datetime2'.

解决办法：

把.edmx后缀文件中的

<Schema Namespace="NerdDinnerModel.Store" Alias="Self" Provider="System.Data.SqlClient" ProviderManifestToken="2012" xmlns:store="http://schemas.microsoft.com/ado/2007/12/edm/EntityStoreSchemaGenerator" xmlns="http://schemas.microsoft.com/ado/2009/02/edm/ssdl">

改为

<Schema Namespace="NerdDinnerModel.Store" Alias="Self" Provider="System.Data.SqlClient" ProviderManifestToken="2005" xmlns:store="http://schemas.microsoft.com/ado/2007/12/edm/EntityStoreSchemaGenerator" xmlns="http://schemas.microsoft.com/ado/2009/02/edm/ssdl">

即可

SQL Server 2005 以上存储过程无法进行查看和编辑，解密存储过程代码如下：

Create PROCEDURE [dbo].[sp_windbi$decrypt]
(@procedure sysname = NULL, @revfl int = 1)
AS
/*
调用形式为：
exec dbo.sp__windbi$decrypt @procedure,0
如果第二个参数使用1的话，会给出该存储过程的一些提示。
--版本4.0  修正存储过程过长解密出来是空白的问题
*/
SET NOCOUNT ON
IF @revfl = 1
BEGIN
PRINT '警告：该存储过程会删除并重建原始的存储过程。'
PRINT ' 在运行该存储过程之前确保你的数据库有一个备份。'
PRINT ' 该存储过程通常应该运行在产品环境的一个备份的非产品环境下。'
PRINT ' 为了运行这个存储过程，将参数@refl的值更改为0。'
RETURN 0
END
DECLARE @intProcSpace bigint, @t bigint, @maxColID smallint,@procNameLength int
select @maxColID = max(subobjid) FROM
sys.sysobjvalues WHERE objid = object_id(@procedure)
--select @maxColID as 'Rows in sys.sysobjvalues'
select @procNameLength = datalength(@procedure) + 29
DECLARE @real_01 nvarchar(max)
DECLARE @fake_01 nvarchar(max)
DECLARE @fake_encrypt_01 nvarchar(max)
DECLARE @real_decrypt_01 nvarchar(max),@real_decrypt_01a nvarchar(max)
declare @objtype varchar(2),@ParentName nvarchar(max)
select @real_decrypt_01a = ''
--提取对象的类型如是存储过程还是函数，如果是触发器，还要得到其父对象的名称
select @objtype=type,@parentname=object_name(parent_object_id)
from sys.objects where [object_id]=object_id(@procedure)
-- 从sys.sysobjvalues里提出加密的imageval记录
SET @real_01=(SELECT top 1 imageval FROM sys.sysobjvalues WHERE objid =
object_id(@procedure) and valclass = 1 order by subobjid)

--创建一个临时表
create table #output ( [ident] [int] IDENTITY (1, 1) NOT NULL ,
[real_decrypt] NVARCHAR(MAX) )
--开始一个事务，稍后回滚
BEGIN TRAN
--更改原始的存储过程，用短横线替换
if @objtype='P'
  SET @fake_01='ALTER PROCEDURE '+ @procedure +' WITH ENCRYPTION AS select 1
  /**//*'+REPLICATE(cast('*'as nvarchar(max)), datalength(@real_01) /2 - @procNameLength)+'*/'
else if @objtype='FN'
  SET @fake_01='ALTER FUNCTION '+ @procedure +'() RETURNS INT WITH ENCRYPTION AS BEGIN RETURN 1
  /**//*'+REPLICATE(cast('*'as nvarchar(max)), datalength(@real_01) /2 - @procNameLength)+'*/ END'
else if @objtype='V'
  SET @fake_01='ALTER view '+ @procedure +' WITH ENCRYPTION AS select 1 as col
  /**//*'+REPLICATE(cast('*'as nvarchar(max)), datalength(@real_01) /2 - @procNameLength)+'*/'
else if @objtype='TR'
  SET @fake_01='ALTER trigger '+ @procedure +' ON '+@parentname+'WITH ENCRYPTION AFTER INSERT AS RAISERROR (''N'',16,10)
  /**//*'+REPLICATE(cast('*'as nvarchar(max)), datalength(@real_01) /2 - @procNameLength)+'*/'
EXECUTE (@fake_01)
--从sys.sysobjvalues里提出加密的假的
SET @fake_encrypt_01=(SELECT top 1 imageval FROM sys.sysobjvalues WHERE objid =
object_id(@procedure) and valclass = 1 order by subobjid )
if @objtype='P'
  SET @fake_01='Create PROCEDURE '+ @procedure +' WITH ENCRYPTION AS select 1
  /**//*'+REPLICATE(cast('*'as nvarchar(max)), datalength(@real_01) /2 - @procNameLength)+'*/'
else if @objtype='FN'
  SET @fake_01='CREATE FUNCTION '+ @procedure +'() RETURNS INT WITH ENCRYPTION AS BEGIN RETURN 1
  /**//*'+REPLICATE(cast('*'as nvarchar(max)), datalength(@real_01) /2 - @procNameLength)+'*/ END'
else if @objtype='V'
  SET @fake_01='Create view '+ @procedure +' WITH ENCRYPTION AS select 1 as col
  /**//*'+REPLICATE(cast('*'as nvarchar(max)), datalength(@real_01) /2 - @procNameLength)+'*/'
else if @objtype='TR'
  SET @fake_01='Create trigger '+ @procedure +' ON '+@parentname+'WITH ENCRYPTION AFTER INSERT AS RAISERROR (''N'',16,10)
  /**//*'+REPLICATE(cast('*'as nvarchar(max)), datalength(@real_01) /2 - @procNameLength)+'*/'
--开始计数
SET @intProcSpace=1
--使用字符填充临时变量
SET @real_decrypt_01 = replicate(cast('A'as nvarchar(max)), (datalength(@real_01) /2 ))
--循环设置每一个变量，创建真正的变量
--每次一个字节
SET @intProcSpace=1
--如有必要，遍历每个@real_xx变量并解密
WHILE @intProcSpace<=(datalength(@real_01)/2)
BEGIN
--真的和假的和加密的假的进行异或处理
SET @real_decrypt_01 = stuff(@real_decrypt_01, @intProcSpace, 1,
NCHAR(UNICODE(substring(@real_01, @intProcSpace, 1)) ^
(UNICODE(substring(@fake_01, @intProcSpace, 1)) ^
UNICODE(substring(@fake_encrypt_01, @intProcSpace, 1)))))
SET @intProcSpace=@intProcSpace+1
END

--通过sp_helptext逻辑向表#output里插入变量
insert #output (real_decrypt) select @real_decrypt_01
--select real_decrypt AS '#output chek' from #output --测试
-- -------------------------------------
--开始从sp_helptext提取
-- -------------------------------------
declare @dbname sysname
,@BlankSpaceAdded int
,@BasePos int
,@CurrentPos int
,@TextLength int
,@LineId int
,@AddOnLen int
,@LFCR int --回车换行的长度
,@DefinedLength int
,@SyscomText nvarchar(max)
,@Line nvarchar(255)
Select @DefinedLength = 255
SELECT @BlankSpaceAdded = 0 --跟踪行结束的空格。注意Len函数忽略了多余的空格
CREATE TABLE #CommentText
(LineId int
,Text nvarchar(255) collate database_default)
--使用#output代替sys.sysobjvalues
DECLARE ms_crs_syscom CURSOR LOCAL
FOR SELECT real_decrypt from #output
ORDER BY ident
FOR READ ONLY
--获取文本
SELECT @LFCR = 2
SELECT @LineId = 1
OPEN ms_crs_syscom
FETCH NEXT FROM ms_crs_syscom into @SyscomText
WHILE @@fetch_status >= 0
BEGIN
SELECT @BasePos = 1
SELECT @CurrentPos = 1
SELECT @TextLength = LEN(@SyscomText)
WHILE @CurrentPos != 0
BEGIN
--通过回车查找行的结束
SELECT @CurrentPos = CHARINDEX(char(13)+char(10), @SyscomText,
@BasePos)
--如果找到回车
IF @CurrentPos != 0
BEGIN
--如果@Lines的长度的新值比设置的大就插入@Lines目前的内容并继续
While (isnull(LEN(@Line),0) + @BlankSpaceAdded +
@CurrentPos-@BasePos + @LFCR) > @DefinedLength
BEGIN
SELECT @AddOnLen = @DefinedLength-(isnull(LEN(@Line),0) +
@BlankSpaceAdded)
INSERT #CommentText VALUES
( @LineId,
isnull(@Line, N'') + isnull(SUBSTRING(@SyscomText,
@BasePos, @AddOnLen), N''))
SELECT @Line = NULL, @LineId = @LineId + 1,
@BasePos = @BasePos + @AddOnLen, @BlankSpaceAdded = 0
END
SELECT @Line = isnull(@Line, N'') +
isnull(SUBSTRING(@SyscomText, @BasePos, @CurrentPos-@BasePos + @LFCR), N'')
SELECT @BasePos = @CurrentPos+2
INSERT #CommentText VALUES( @LineId, @Line )
SELECT @LineId = @LineId + 1
SELECT @Line = NULL
END
ELSE
--如果回车没找到
BEGIN
IF @BasePos <= @TextLength
BEGIN
--如果@Lines长度的新值大于定义的长度
While (isnull(LEN(@Line),0) + @BlankSpaceAdded +
@TextLength-@BasePos+1 ) > @DefinedLength
BEGIN
SELECT @AddOnLen = @DefinedLength -
(isnull(LEN(@Line),0) + @BlankSpaceAdded)
INSERT #CommentText VALUES
( @LineId,
isnull(@Line, N'') + isnull(SUBSTRING(@SyscomText,
@BasePos, @AddOnLen), N''))
SELECT @Line = NULL, @LineId = @LineId + 1,
@BasePos = @BasePos + @AddOnLen, @BlankSpaceAdded =
0
END
SELECT @Line = isnull(@Line, N'') +
isnull(SUBSTRING(@SyscomText, @BasePos, @TextLength-@BasePos+1 ), N'')
if LEN(@Line) < @DefinedLength and charindex(' ',
@SyscomText, @TextLength+1 ) > 0
BEGIN
SELECT @Line = @Line + ' ', @BlankSpaceAdded = 1
END
END
END
END
FETCH NEXT FROM ms_crs_syscom into @SyscomText
END
IF @Line is NOT NULL
INSERT #CommentText VALUES( @LineId, @Line )
select Text from #CommentText order by LineId
CLOSE ms_crs_syscom
DEALLOCATE ms_crs_syscom
DROP TABLE #CommentText
-- -------------------------------------
--结束从sp_helptext提取
-- -------------------------------------
--删除用短横线创建的存储过程并重建原始的存储过程
ROLLBACK TRAN
DROP TABLE #output
go