有時我們要用到批量操作時都會對字符串進行拆分,可是SQL Server中卻沒有自帶Split函數,所以要自己來實現了。沒什么好說的,需要的朋友直接拿去用吧
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SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
/*
by kudychen 2011-9-28
*/
CREATE function [ dbo ] . [ SplitString ]
(
@Input nvarchar ( max ), -- input string to be separated
@Separator nvarchar ( max ) = ' , ' , -- a string that delimit the substrings in the input string
@RemoveEmptyEntries bit = 1 -- the return value does not include array elements that contain an empty string
)
returns @TABLE table
(
[ Id ] int identity ( 1 , 1 ),
[ Value ] nvarchar ( max )
)
as
begin
declare @Index int , @Entry nvarchar ( max )
set @Index = charindex ( @Separator , @Input )
while ( @Index > 0 )
begin
set @Entry = ltrim ( rtrim ( substring ( @Input , 1 , @Index - 1 )))
if ( @RemoveEmptyEntries = 0 ) or ( @RemoveEmptyEntries = 1 and @Entry <> '' )
begin
insert into @TABLE ( [ Value ] ) Values ( @Entry )
end
set @Input = substring ( @Input , @Index + datalength ( @Separator ) / 2 , len ( @Input ))
set @Index = charindex ( @Separator , @Input )
end
set @Entry = ltrim ( rtrim ( @Input ))
if ( @RemoveEmptyEntries = 0 ) or ( @RemoveEmptyEntries = 1 and @Entry <> '' )
begin
insert into @TABLE ( [ Value ] ) Values ( @Entry )
end
return
end
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如何使用:
declare @str1 varchar ( max ), @str2 varchar ( max ), @str3 varchar ( max )
set @str1 = ' 1,2,3 '
set @str2 = ' 1###2###3 '
set @str3 = ' 1###2###3### '
select [ Value ] from [ dbo ] . [ SplitString ] ( @str1 , ' , ' , 1 )
select [ Value ] from [ dbo ] . [ SplitString ] ( @str2 , ' ### ' , 1 )
select [ Value ] from [ dbo ] . [ SplitString ] ( @str3 , ' ### ' , 0 )
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執行結果:
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里面還有個自增的[Id]字段哦,在某些情況下有可能會用上的,例如根據Id來保存排序等等。
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例如根據某表的ID保存排序:
update a set a. [ Order ] = t. [ Id ]
from [ dbo ] . [ 表 ] as a join [ dbo ] .SplitString( ' 1,2,3 ' , ' , ' , 1 ) as t on a. [ Id ] = t. [ Value ]
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具體的應用請根據自己的情況來吧:)
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