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1¡¢xp_sscanf£¬ÓÃËü¿ÉÒÔ·Ö½â¸ñʽÏà¶Ô¹Ì¶¨µÄ×Ö·û´®£¬Õâ¶ÔÓÚÑá¾ëʹÓÃÒ»¶ÑsubstringºÍcharindexµÄÅóÓÑÀ´Ëµ²»´í¡£±ÈÈçǰ¼¸ÌìµÄÒ»¸öÌû×ÓÖÐÌá³öµÄÈçºÎ·Ö½âipµØÖ·£¬Ïà¶Ô¼òÁ·ÇÒͨÓõĴúÂëÓ¦¸ÃÊÇÏÂÃæÕâÑù
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if (object_id ('f_getip' ) is not null )
drop function f_getip
go
create function dbo . f_getip (@ ip varchar (100 ))
returns @ t table (a int , b int , c int , d int )
as
begin
    set @ ip = replace (@ ip , '.' , ' ' )
    declare
    @ s1 varchar (3 ) , @ s2 varchar (3 ),
    @ s3 varchar (3 ) , @ s4 varchar (3 )
    exec xp_sscanf @ ip , '%s %s %s %s' , @ s1 output , @ s2 output , @ s3 output , @ s4 output
    insert into @ t select @ s1 , @ s2 , @ s3 , @ s4
    return
end
go
select * from dbo . f_getip ('192.168.0.1' )
go
/*
a           b           c           d
----------- ----------- ----------- -----------
192         168         0           1
*/
2¡¢xp_sprintf£¬ÓÃËü¿ÉÒÔÆ´½Ó³öÒ»¸ö×Ö·û´®¶ø²»Óõ£ÐĹý¶àµÄ¼ÓºÅºÜÒýºÅÄÑÒÔ¿ØÖÆ£¬±ÈÈçÒ»¸ö¶¯Ì¬Ö´ÐÐsqlÓï¾äµÄ´æ´¢¹ý³Ì
if (object_id ('p_select' ) is not null )
drop proc p_select
go
create proc p_select (@ tb varchar (100 ), @ cols varchar (100 ), @ wherecol varchar (100 ), @ value varchar (100 ))
as
begin
    declare @ s varchar (8000 )
    exec xp_sprintf @ s output , 'select %s from %s where %s=''%s''' , @ cols , @ tb , @ wherecol , @ value
    exec (@ s)
end
go
exec p_selec


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