sql 切割字符串Split（）函数

作者：袖梨 2022-06-29

有时我们要用到批量操作时都会对字符串进行拆分，可是SQL Server中却没有自带Split函数，所以要自己来实现了。没什么好说的，需要的朋友直接拿去用吧

 代码如下 复制代码

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

如何使用：

 代码如下 复制代码

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)


里面还有个自增的[Id]字段哦，在某些情况下有可能会用上的，例如根据Id来保存排序等等。

 

例如根据某表的ID保存排序： 

 代码如下 复制代码

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]

实例

 代码如下 复制代码

create function [dbo].[split]
(
@SourceSql varchar(8000),
@StrSeprate varchar(10)
)
returns @temp table(F1 varchar(100))
as
begin
    declare @i int
    set @SourceSql = rtrim(ltrim(@SourceSql))
    set @i = charindex(@StrSeprate,@SourceSql)
    while @i >= 1
    begin
        if len(left(@SourceSql,@i-1))>0
        begin
            insert @temp values(left(@SourceSql,@i-1))
        end
        set @SourceSql=substring(@SourceSql,@i+1,len(@SourceSql)-@i)
        set @i=charindex(@StrSeprate,@SourceSql)
    end
    if @SourceSql <> ''
        insert @temp values(@SourceSql)
    return
end
 
select * from split(',,777,,11,,888,88,,1122,888,88,77,,00,,00',',')

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