Sql Server中使用特定字符分割字符串

 

在T-SQL中我们经常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。这里将字符串分割以table形式输出
语法如下：

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
    /*
    create by shuke.li 2020-9-15
    */
    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

只要在新建查询里执行上面的代码，即完成了split函数的建立。
下面来测试这一函数的功能，测试所使用的的SQL脚本如下：

declare @str1 varchar(max)
set @str1 = 'CFER-3345-3323,CFER-0023-2299,CFER-0023-6677,CFER-0023-7678,CFER-4565-2299,CFER-0023-6678'

select * from [dbo].[SplitString](@str1, ',', 0)