字符串处理示例--列车车次查询.sql

--列车车次信息数据表
CREATE TABLE tb(col varchar(100))
INSERT tb SELECT '1434/1/2/14'
UNION ALL SELECT '"10653(85707)"'
UNION ALL SELECT '"32608/7(83212/1)"'
UNION ALL SELECT '"50057（)"'
UNION ALL SELECT '"T888（备）"'
UNION ALL SELECT '"21058(81404/3)0"'
UNION ALL SELECT '"22028(80404.10264)"'
UNION ALL SELECT '20037(80303.84006/9)'
UNION ALL SELECT '24031(80410/9'
UNION ALL SELECT '24048(80904)(23118)'
UNION ALL SELECT '22080(80406.83080.10284)'
UNION ALL SELECT '0031(5632 5629. 1434/1/2/14)'
CREATE FUNCTION dbo.f_CompSTR(
@str varchar(8000), --包含车次的字符串
@find varchar(50) --要查询的值
)RETURNS bit
AS
BEGIN
IF @str=@find RETURN(1)
IF LEN(@str)<LEN(@find) RETURN(0)

--替换掉车次字符串中的无效数据
SELECT @str=REPLACE(@str,a,b)
FROM(--采用表集的处理方法,是为了方便以后扩充处理其他无效数据
SELECT a='"',b='')a

--统计数据分隔符
SELECT @str=REPLACE(@str,a,b)
FROM(
  SELECT a='(',b='\' UNION ALL
  SELECT a=')',b='\' UNION ALL
  SELECT a='（',b='\' UNION ALL
  SELECT a='）',b='\' UNION ALL
  SELECT a=' ',b='\' UNION ALL
  SELECT a='　',b='\' UNION ALL
  SELECT a='.',b='\' UNION ALL
  SELECT a='．',b='\')a

--分拆比较处理
DECLARE @s1 varchar(8000),@h varchar(100),@s varchar(100),@l int
WHILE @str>''
BEGIN
  SELECT @s1=LEFT(@str,CHARINDEX('\',@str+'\')-1),
   @str=STUFF(@str,1,CHARINDEX('\',@str+'\'),''),
   @h=LEFT(@s1,CHARINDEX('/',@s1+'/')-1),
   @l=LEN(@h)+1
  IF @h=@find RETURN(1)
  WHILE CHARINDEX('/',@s1+'/')>0
  BEGIN
   SELECT @s=LEFT(@s1,CHARINDEX('/',@s1+'/')-1),
    @s1=STUFF(@s1,1,CHARINDEX('/',@s1+'/'),'')
   IF LEN(@s)<@l
    SET @s=STUFF(@h,@l-LEN(@s),8000,@s)
   IF @find=CASE
     WHEN LEN(@s)<@l THEN STUFF(@h,@l-LEN(@s),8000,@s)
     ELSE @S END
    RETURN(1)
  END
END
RETURN(0)
END
GO