sql server 表值函數將字符串轉爲列

1.標題：將字符串@str變成表中的列

DECLARE @str VARCHAR(8000)
SET @str='a,bb,cc,dd,ff,gg'

SELECT @str,* FROM Func_SplitStrToTable(@str)

 

代碼以下：
SET QUOTED_IDENTIFIER ON
SET ANSI_NULLS ON
GO
CREATE FUNCTION [dbo].[Func_SplitStrToTable] ( @str VARCHAR(8000) )
RETURNS @tableName TABLE ( Col VARCHAR(100) )
AS --該函數用於把一個用逗號分隔的多個數據字符串變成一個表的一列，例如字符串'1,2,3,4,5' 將轉換成一個表

    BEGIN

        SET @str = @str + ','

        DECLARE @insertStr VARCHAR(100) --截取後的第一個字符串

        DECLARE @newstr VARCHAR(8000) --截取第一個字符串後剩餘的字符串

        SET @insertStr = LEFT(@str, CHARINDEX(',', @str) - 1)

        SET @newstr = STUFF(@str, 1, CHARINDEX(',', @str), '')

        INSERT  @tableName
        VALUES  ( @insertStr )

        WHILE ( LEN(@newstr) > 0 )
            BEGIN

                SET @insertStr = LEFT(@newstr, CHARINDEX(',', @newstr) - 1)

                INSERT  @tableName
                VALUES  ( @insertStr )

                SET @newstr = STUFF(@newstr, 1, CHARINDEX(',', @newstr), '')

            END

        RETURN

    END
GO

 

/*  
2.標題：按某字段合併字符串之一(簡單合併)  
3.做者：(十八年風雨,守得冰山雪蓮花開)  
4.時間：2008-11-06  
5.地點：廣東深圳  
6.  
7.描述：將以下形式的數據按id字段合併value字段。  
8.id    value  
9.----- ------   
10.1     aa  
11.1     bb  
12.2     aaa  
13.2     bbb  
14.2     ccc  
15.須要獲得結果：  
16.id     value  
17.------ -----------   
18.1      aa,bb  
19.2      aaa,bbb,ccc  
20.即：group by id, 求 value 的和（字符串相加）  
21.*/  
22.--一、sql2000中只能用自定義的函數解決   
23.create table tb(id int, value varchar(10))  
24.insert into tb values(1, 'aa')  
25.insert into tb values(1, 'bb')  
26.insert into tb values(2, 'aaa')  
27.insert into tb values(2, 'bbb')  
28.insert into tb values(2, 'ccc')  
29.go  
30.  
31.create function dbo.f_str(@id varchar(10)) returns varchar(1000)  
32.as  
33.begin  
34.  declare @str varchar(1000)  
35.  select @str = isnull(@str + ',' , '') + cast(value as varchar) from tb where id = @id  
36.  return @str  
37.end  
38.go  
39.  
40.--調用函數   
41.select id , value = dbo.f_str(id) from tb group by id  
42.  
43.drop function dbo.f_str  
44.drop table tb  
45.  
46.  
47.--二、sql2005中的方法   
48.create table tb(id int, value varchar(10))  
49.insert into tb values(1, 'aa')  
50.insert into tb values(1, 'bb')  
51.insert into tb values(2, 'aaa')  
52.insert into tb values(2, 'bbb')  
53.insert into tb values(2, 'ccc')  
54.go  
55.  
56.select id, [value] = stuff((select ',' + [value] from tb t where id = tb.id for xml path('')) , 1 , 1 , '')  
57.from tb  
58.group by id  
59.  
60.drop table tb  
61.  
62.  
63.--三、使用遊標合併數據   
64.create table tb(id int, value varchar(10))  
65.insert into tb values(1, 'aa')  
66.insert into tb values(1, 'bb')  
67.insert into tb values(2, 'aaa')  
68.insert into tb values(2, 'bbb')  
69.insert into tb values(2, 'ccc')  
70.go  
71.declare @t table(id int,value varchar(100))--定義結果集表變量   
72.--定義遊標並進行合併處理   
73.declare my_cursor cursor local for  
74.select id , value from tb  
75.declare @id_old int , @id int , @value varchar(10) , @s varchar(100)  
76.open my_cursor  
77.fetch my_cursor into @id , @value  
78.select @id_old = @id , @s=''  
79.while @@FETCH_STATUS = 0  
80.begin  
81.    if @id = @id_old  
82.       select @s = @s + ',' + cast(@value as varchar)  
83.    else  
84.      begin  
85.        insert @t values(@id_old , stuff(@s,1,1,''))  
86.        select @s = ',' + cast(@value as varchar) , @id_old = @id  
87.      end  
88.    fetch my_cursor into @id , @value  
89.END  
90.insert @t values(@id_old , stuff(@s,1,1,''))  
91.close my_cursor  
92.deallocate my_cursor  
93.  
94.select * from @t  
95.drop table tb