使用SQL Server,我如何分割一个字符串,以便我可以访问项目x?
拿一根“你好,约翰·史密斯”的绳子。我如何通过空格分割字符串并访问索引1应该返回“约翰”的项目?
使用SQL Server,我如何分割一个字符串,以便我可以访问项目x?
拿一根“你好,约翰·史密斯”的绳子。我如何通过空格分割字符串并访问索引1应该返回“约翰”的项目?
当前回答
CREATE TABLE test(
id int,
adress varchar(100)
);
INSERT INTO test VALUES(1, 'Ludovic Aubert, 42 rue de la Victoire, 75009, Paris, France'),(2, 'Jose Garcia, 1 Calle de la Victoria, 56500 Barcelona, Espana');
SELECT id, value, COUNT(*) OVER (PARTITION BY id) AS n, ROW_NUMBER() OVER (PARTITION BY id ORDER BY (SELECT NULL)) AS rn, adress
FROM test
CROSS APPLY STRING_SPLIT(adress, ',')
其他回答
试试这个:
CREATE function [SplitWordList]
(
@list varchar(8000)
)
returns @t table
(
Word varchar(50) not null,
Position int identity(1,1) not null
)
as begin
declare
@pos int,
@lpos int,
@item varchar(100),
@ignore varchar(100),
@dl int,
@a1 int,
@a2 int,
@z1 int,
@z2 int,
@n1 int,
@n2 int,
@c varchar(1),
@a smallint
select
@a1 = ascii('a'),
@a2 = ascii('A'),
@z1 = ascii('z'),
@z2 = ascii('Z'),
@n1 = ascii('0'),
@n2 = ascii('9')
set @ignore = '''"'
set @pos = 1
set @dl = datalength(@list)
set @lpos = 1
set @item = ''
while (@pos <= @dl) begin
set @c = substring(@list, @pos, 1)
if (@ignore not like '%' + @c + '%') begin
set @a = ascii(@c)
if ((@a >= @a1) and (@a <= @z1))
or ((@a >= @a2) and (@a <= @z2))
or ((@a >= @n1) and (@a <= @n2))
begin
set @item = @item + @c
end else if (@item > '') begin
insert into @t values (@item)
set @item = ''
end
end
set @pos = @pos + 1
end
if (@item > '') begin
insert into @t values (@item)
end
return
end
像这样测试它:
select * from SplitWordList('Hello John Smith')
在我看来,你们把事情搞得太复杂了。只需要创建一个CLR UDF就可以了。
using System;
using System.Data;
using System.Data.SqlClient;
using System.Data.SqlTypes;
using Microsoft.SqlServer.Server;
using System.Collections.Generic;
public partial class UserDefinedFunctions {
[SqlFunction]
public static SqlString SearchString(string Search) {
List<string> SearchWords = new List<string>();
foreach (string s in Search.Split(new char[] { ' ' })) {
if (!s.ToLower().Equals("or") && !s.ToLower().Equals("and")) {
SearchWords.Add(s);
}
}
return new SqlString(string.Join(" OR ", SearchWords.ToArray()));
}
};
下面是一个SQL UDF,它可以分割字符串并只抓取特定的部分。
create FUNCTION [dbo].[udf_SplitParseOut]
(
@List nvarchar(MAX),
@SplitOn nvarchar(5),
@GetIndex smallint
)
returns varchar(1000)
AS
BEGIN
DECLARE @RtnValue table
(
Id int identity(0,1),
Value nvarchar(MAX)
)
DECLARE @result varchar(1000)
While (Charindex(@SplitOn,@List)>0)
Begin
Insert Into @RtnValue (value)
Select Value = ltrim(rtrim(Substring(@List,1,Charindex(@SplitOn,@List)-1)))
Set @List = Substring(@List,Charindex(@SplitOn,@List)+len(@SplitOn),len(@List))
End
Insert Into @RtnValue (Value)
Select Value = ltrim(rtrim(@List))
select @result = value from @RtnValue where ID = @GetIndex
Return @result
END
我知道已经晚了,但我最近有了这个需求,并提出了下面的代码。我没有选择使用用户定义的函数。希望这能有所帮助。
SELECT
SUBSTRING(
SUBSTRING('Hello John Smith' ,0,CHARINDEX(' ','Hello John Smith',CHARINDEX(' ','Hello John Smith')+1)
),CHARINDEX(' ','Hello John Smith'),LEN('Hello John Smith')
)
一个简单的优化算法:
ALTER FUNCTION [dbo].[Split]( @Text NVARCHAR(200),@Splitor CHAR(1) )
RETURNS @Result TABLE ( value NVARCHAR(50))
AS
BEGIN
DECLARE @PathInd INT
Set @Text+=@Splitor
WHILE LEN(@Text) > 0
BEGIN
SET @PathInd=PATINDEX('%'+@Splitor+'%',@Text)
INSERT INTO @Result VALUES(SUBSTRING(@Text, 0, @PathInd))
SET @Text= SUBSTRING(@Text, @PathInd+1, LEN(@Text))
END
RETURN
END