今天在做乙個很奇葩的東西，中間有個過程要在sql觸發器裡面呼叫webservice介面。呵呵~
alter trigger tgr_updatememcached
on dbo.[user]
after update as
--獲得更新前的資料
--select * from deleted as olddata
--獲得更新後的資料
--select * from inserted as newdata
--呼叫webservice----------------
declare @funname nvarchar(50)--webservice中呼叫的方法名：例如'getmobilecodeinfo'
set @funname = 'updatecache'
--以下引數對應webservice中4個引數的[引數名]
declare @usercode nvarchar(36),@username nvarchar(36),@userage nvarchar(36)
set @usercode='usercode'
set @username='username'
set @userage='userage'
--拼接引數名稱
declare @usercode_value nvarchar(50)='0000',@username_value nvarchar(50)='0000',@userage_value nvarchar(50)='0000'
select * from inserted
select @usercode_value=ltrim(rtrim(usercode)),@username_value=ltrim(rtrim(username)),@userage_value=ltrim(rtrim(userage)) from inserted ;--從inserted表給引數賦值
--拼接位址
set @serviceurl = @urladdress +'/'+ @funname + '?' + @usercode + '=' + [dbo].[urlencode](@usercode_value) +'&' + @username + '=' +[dbo].[urlencode](@username_value) +'&' + @userage + '=' + [dbo].[urlencode](@userage_value)
--set @serviceurl = @urladdress +'/'+ @funname + '?' + @usercode + '=' + @usercode_value +'&' + @username + '=' +@username_value +'&' + @userage + '=' + @userage_value
--select @serviceurl --檢視拼接位址，除錯時開啟
--訪問位址獲取結果
declare @object as int
declare @responsetext as nvarchar(4000)
exec sp_oacreate 'msxml2.xmlhttp', @object out; --建立ole元件物件
exec sp_oamethod @object, 'open', null, 'post',@serviceurl,'false' --開啟鏈結，注意是get還是post
exec sp_oamethod @object, 'send'
exec sp_oamethod @object, 'responsetext', @responsetext output --輸出引數
select @responsetext --輸出結果
exec sp_oadestroy @object
go
為了使sql可以想**裡面對引數進行編碼和解碼，還需要加入下面自定義函式：
use [testmemcached]
go/****** object: userdefinedfunction [dbo].[urlencode] script date: 2015/7/6 21:36:27 ******/
set ansi_nulls on
goset quoted_identifier on
goalter function [dbo].[urlencode]
( @param nvarchar(2000)
)returns varchar(max)
asbegin
declare @hexstr varchar(max)
--use system function to convert input string to hex string
set @hexstr = master.dbo.fn_varbintohexstr(convert(varbinary(max), @param))
--remove the starting '0x'
set @hexstr = right(@hexstr, len(@hexstr)-2)
--declare required variables
declare @i int, @len int
declare @output varchar(max), @s char(4), @c char(1)
declare @lobyte tinyint, @hibyte tinyint
--get length
set @len=len(@hexstr)/4
--start with first character
set @i=0
--prepare the output string
set @output=''
while @i<@len
begin
set @s=substring(@hexstr, @i*4 + 1, 4)
if right(@s, 2)='00'
begin
--try to convert 2 hex digits to char
set @lobyte = ascii(substring(@s, 2, 1)) - 48
if @lobyte>10 set @lobyte = @lobyte - 39 --0x61'a'-> 10
set @hibyte = ascii(substring(@s, 1, 1)) - 48
if @hibyte>10 set @hibyte = @hibyte - 39
set @c=char(@lobyte + @hibyte * 16)
--if it's a reserved character, don't encode
if @c like '[a-za-z0-9()''*-._! ]'
set @output = @output + @c
else
set @output = @output + '%' + left(@s, 2)
endelse
set @output = @output + '%u' + right(@s, 2) + left(@s, 2)
--move to next hex
set @i = @i + 1
endreturn @output
end
同時要注意webservice裡面的方法喲：
[webmethod]
public bool updatecache(string usercode, string username, string userage)
);}
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