SQL Like中的逗号分隔符
在与数据库交互的过程中，我们经常需要把一串ID组成的字符串当作参数传给存储过程获取数据。很多时候我们希望把这个字符串转成集合以方便用于in操作。 有两种方式可以方便地把这个以某种符号分隔的ID字符串转成临时表。
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方式一：通过charindex和substring。
代码
create
function
func_splitstring
( @str nvarchar ( max ), @split varchar ( 10 ))
returns @t Table (c1 varchar ( 100 ))
as
begin
declare @i int
declare @s int
set @i = 1
set @s = 1
while ( @i > 0 )
begin
set @i = charindex ( @split , @str , @s )
if ( @i > 0 )
begin
insert @t (c1) values ( substring ( @str , @s , @i - @s ))
end
else begin
insert @t (c1) values ( substring ( @str , @s , len ( @str ) - @s + 1 ))
end
set @s = @i + 1
end
return
end
( @str nvarchar ( max ), @split varchar ( 10 ))
returns @t Table (c1 varchar ( 100 ))
as
begin
declare @i int
declare @s int
set @i = 1
set @s = 1
while ( @i > 0 )
begin
set @i = charindex ( @split , @str , @s )
if ( @i > 0 )
begin
insert @t (c1) values ( substring ( @str , @s , @i - @s ))
end
else begin
insert @t (c1) values ( substring ( @str , @s , len ( @str ) - @s + 1 ))
end
set @s = @i + 1
end
return
end
执行：select * from dbo.func_splitstring('1,2,3,4,5,6', ',')
结果：
方式二：通过XQuery（需要SQL Server 2005以上版本）。
代码
create
function
func_splitid
( @str varchar ( max ), @split varchar ( 10 ))
RETURNS @t Table (c1 int )
AS
BEGIN
DECLARE @x XML
SET @x = CONVERT (XML, ' <items><item id=" ' + REPLACE ( @str , @split , ' "/><item id=" ' ) + ' "/></items> ' )
INSERT INTO @t SELECT x.item.value( ' @id[1] ' , ' INT ' ) FROM @x .nodes( ' //items/item ' ) AS x(item)
RETURN
END
( @str varchar ( max ), @split varchar ( 10 ))
RETURNS @t Table (c1 int )
AS
BEGIN
DECLARE @x XML
SET @x = CONVERT (XML, ' <items><item id=" ' + REPLACE ( @str , @split , ' "/><item id=" ' ) + ' "/></items> ' )
INSERT INTO @t SELECT x.item.value( ' @id[1] ' , ' INT ' ) FROM @x .nodes( ' //items/item ' ) AS x(item)
RETURN
END
执行：select * from dbo.func_splitid('1,2,3,4,5,6', ',')
结果：
其他写法:
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alter
FUNCTION
[
dbo
]
.
[
func_split
]
(
@str
nvarchar
(
4000
),
@separtor
varchar
(
10
))
returns @temp table ( [ row ] [ int ] IDENTITY ( 1 , 1 ) NOT NULL ,value nvarchar ( 4000 ))
as
begin
declare @i int
set @str = rtrim ( ltrim ( @str ))
set @i = charindex ( @separtor , @str )
while @i >= 1
begin
insert @temp values ( left ( @str , @i - 1 ))
set @str = substring ( @str , @i + 1 , len ( @str ) - @i )
set @i = charindex ( @separtor , @str )
end
if @str <> ''
insert @temp values ( @str )
return
end
returns @temp table ( [ row ] [ int ] IDENTITY ( 1 , 1 ) NOT NULL ,value nvarchar ( 4000 ))
as
begin
declare @i int
set @str = rtrim ( ltrim ( @str ))
set @i = charindex ( @separtor , @str )
while @i >= 1
begin
insert @temp values ( left ( @str , @i - 1 ))
set @str = substring ( @str , @i + 1 , len ( @str ) - @i )
set @i = charindex ( @separtor , @str )
end
if @str <> ''
insert @temp values ( @str )
return
end
