WITH Digits AS (
SELECT 0 as Number
UNION SELECT 1
UNION SELECT 2
UNION SELECT 3
UNION SELECT 4
UNION SELECT 5
UNION SELECT 6
UNION SELECT 7
UNION SELECT 8
UNION SELECT 9
)
SELECT
(d5.Number * 100000)
+ (d4.Number * 10000)
+ (d3.Number * 1000)
+ (d2.Number * 100)
+ (d1.Number * 10)
+ d0.Number as Number INTO #t
FROM
Digits AS d0
, Digits AS d1
, Digits AS d2
, Digits AS d3
, Digits AS d4
, Digits AS d5
ORDER BY NumberSELECT RIGHT('000000'+CONVERT(VARCHAR(7),number),7) FROM #t
SELECT 0 as Number
UNION SELECT 1
UNION SELECT 2
UNION SELECT 3
UNION SELECT 4
UNION SELECT 5
UNION SELECT 6
UNION SELECT 7
UNION SELECT 8
UNION SELECT 9
)
SELECT
(d5.Number * 100000)
+ (d4.Number * 10000)
+ (d3.Number * 1000)
+ (d2.Number * 100)
+ (d1.Number * 10)
+ d0.Number as Number INTO #t
FROM
Digits AS d0
, Digits AS d1
, Digits AS d2
, Digits AS d3
, Digits AS d4
, Digits AS d5
ORDER BY NumberSELECT RIGHT('000000'+CONVERT(VARCHAR(7),number),7) FROM #t
数据库里有编号字段
BH00001
BH00002
BH00003
BH00004
如何实现自动增长 --下面的代码生成长度为8的编号,编号以BH开头,其余6位为流水号。
--得到新编号的函数
CREATE FUNCTION f_NextBH()
RETURNS char(8)
AS
BEGIN
RETURN(SELECT 'BH'+RIGHT(1000001+ISNULL(RIGHT(MAX(BH),6),0),6) FROM tb WITH(XLOCK,PAGLOCK))
END
GO--在表中应用函数
CREATE TABLE tb(
BH char(8) PRIMARY KEY DEFAULT dbo.f_NextBH(),
col int)--插入资料
BEGIN TRAN
INSERT tb(col) VALUES(1)
INSERT tb(col) VALUES(2)
INSERT tb(col) VALUES(3)
DELETE tb WHERE col=3
INSERT tb(col) VALUES(4)
INSERT tb(BH,col) VALUES(dbo.f_NextBH(),14)
COMMIT TRAN--显示结果
SELECT * FROM tb
/*--结果
BH col
---------------- -----------
BH000001 1
BH000002 2
BH000003 4
BH000004 14
--*/ create table tb
(id int identity,
name varchar(10),
code as 'BH'+right('0000'+cast(id as varchar),5))
go
insert tb(name) select 'A'
union all select 'B'
union all select 'C'
union all select 'D'select * from tbdrop table tb/*
id name code
----------- ---------- ------------
1 A BH00001
2 B BH00002
3 C BH00003
4 D BH00004(所影响的行数为 4 行)
*/