在日常应用中,往往根据实际需求录入一些值,而这些值不能直接使用,所以Sql中经常会对字段值进行一些常规的处理。这里搜集了(提取数字、英文、中文、过滤重复字符、分割字符的方法),方便日后查询使用。
一、判断字段值是否有中文
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--SQL 判断字段值是否有中文 create function fun_getCN(@str nvarchar(4000)) returns nvarchar(4000) as begin declare @word nchar (1),@CN nvarchar(4000) set @CN= '' while len(@str)>0 begin set @word= left (@str,1) if unicode(@word) between 19968 and 19968+20901 set @CN=@CN+@word set @str= right (@str,len(@str)-1) end return @CN end select dbo.fun_getCN( 'ASDKG论坛KDL' ) --论坛 select dbo.fun_getCN( 'ASDKG論壇KDL' ) --論壇 select dbo.fun_getCN( 'ASDKDL' ) --空 |
二、提取数字
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IF OBJECT_ID( 'DBO.GET_NUMBER2' ) IS NOT NULL DROP FUNCTION DBO.GET_NUMBER2 GO CREATE FUNCTION DBO.GET_NUMBER2(@S VARCHAR (100)) RETURNS VARCHAR (100) AS BEGIN WHILE PATINDEX( '%[^0-9]%' ,@S) > 0 BEGIN set @s=stuff(@s,patindex( '%[^0-9]%' ,@s),1, '' ) END RETURN @S END GO --测试 PRINT DBO.GET_NUMBER( '呵呵ABC123ABC' ) GO --123 |
三、提取英文
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--提取英文 IF OBJECT_ID( 'DBO.GET_STR' ) IS NOT NULL DROP FUNCTION DBO.GET_STR GO CREATE FUNCTION DBO.GET_STR(@S VARCHAR (100)) RETURNS VARCHAR (100) AS BEGIN WHILE PATINDEX( '%[^a-z]%' ,@S) > 0 BEGIN set @s=stuff(@s,patindex( '%[^a-z]%' ,@s),1, '' ) END RETURN @S END GO --测试 PRINT DBO.GET_STR( '呵呵ABC123ABC' ) GO |
四、提取中文
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--提取中文 IF OBJECT_ID( 'DBO.CHINA_STR' ) IS NOT NULL DROP FUNCTION DBO.CHINA_STR GO CREATE FUNCTION DBO.CHINA_STR(@S NVARCHAR(100)) RETURNS VARCHAR (100) AS BEGIN WHILE PATINDEX( '%[^吖-座]%' ,@S) > 0 SET @S = STUFF(@S,PATINDEX( '%[^吖-座]%' ,@S),1,N '' ) RETURN @S END GO PRINT DBO.CHINA_STR( '呵呵ABC123ABC' ) GO |
五、过滤重复字段(多种方法)
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--过滤重复字符 IF OBJECT_ID( 'DBO.DISTINCT_STR' ) IS NOT NULL DROP FUNCTION DBO.DISTINCT_STR GO CREATE FUNCTION DBO.DISTINCT_STR(@S NVARCHAR(100),@SPLIT VARCHAR (50)) RETURNS VARCHAR (100) AS BEGIN IF @S IS NULL RETURN ( NULL ) DECLARE @NEW VARCHAR (50),@ INDEX INT ,@ TEMP VARCHAR (50) IF LEFT (@S,1)<>@SPLIT SET @S = @SPLIT+@S IF RIGHT (@S,1)<>@SPLIT SET @S = @S+@SPLIT WHILE CHARINDEX(@SPLIT,@S)>0 AND LEN(@S)<>1 BEGIN SET @ INDEX = CHARINDEX(@SPLIT,@S) SET @ TEMP = LEFT (@S,CHARINDEX(@SPLIT,@S,@ INDEX +LEN(@SPLIT))) IF @NEW IS NULL SET @NEW = ISNULL (@NEW, '' )+@ TEMP ELSE SET @NEW = ISNULL (@NEW, '' )+ REPLACE (@ TEMP ,@SPLIT, '' )+@SPLIT WHILE CHARINDEX(@ TEMP ,@S)>0 BEGIN SET @S=STUFF(@S,CHARINDEX(@ TEMP ,@S)+LEN(@SPLIT),CHARINDEX(@SPLIT,@S,CHARINDEX(@ TEMP ,@S)+LEN(@SPLIT))-CHARINDEX(@ TEMP ,@S), '' ) END END RETURN RIGHT ( LEFT (@NEW,LEN(@NEW)-1),LEN( LEFT (@NEW,LEN(@NEW)-1))-1) END GO PRINT DBO.DISTINCT_STR( 'A,A,B,C,C,B,C,' , ',' ) --A,B,C GO -------------------------------------------------------------------- --过滤重复字符2 IF OBJECT_ID( 'DBO.DISTINCT_STR2' ) IS NOT NULL DROP FUNCTION DBO.DISTINCT_STR2 GO CREATE FUNCTION DBO.DISTINCT_STR2(@S varchar (8000)) RETURNS VARCHAR (100) AS BEGIN IF @S IS NULL RETURN ( NULL ) DECLARE @NEW VARCHAR (50),@ INDEX INT ,@ TEMP VARCHAR (50) WHILE LEN(@S)>0 BEGIN SET @NEW= ISNULL (@NEW, '' )+ LEFT (@S,1) SET @S= REPLACE (@S, LEFT (@S,1), '' ) END RETURN @NEW END GO SELECT DBO.DISTINCT_STR2( 'AABCCD' ) --ABCD GO |
六、根据特定字符串分割字段值
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IF OBJECT_ID( 'DBO.SPLIT_STR' ) IS NOT NULL DROP FUNCTION DBO.SPLIT_STR GO CREATE FUNCTION DBO.SPLIT_STR( @S varchar (8000), --包含多个数据项的字符串 @ INDEX int , --要获取的数据项的位置 @SPLIT varchar (10) --数据分隔符 ) RETURNS VARCHAR (100) AS BEGIN IF @S IS NULL RETURN ( NULL ) DECLARE @SPLITLEN int SELECT @SPLITLEN=LEN(@SPLIT+ 'A' )-2 WHILE @ INDEX >1 AND CHARINDEX(@SPLIT,@S+@SPLIT)>0 SELECT @ INDEX =@ INDEX -1,@S=STUFF(@S,1,CHARINDEX(@SPLIT,@S+@SPLIT)+@SPLITLEN, '' ) RETURN ( ISNULL ( LEFT (@S,CHARINDEX(@SPLIT,@S+@SPLIT)-1), '' )) END GO PRINT DBO.SPLIT_STR( 'AA|BB|CC' ,2, '|' ) -- GO |