sql格式化和填充列

Question

I"m trying to format and pad LSD numbers to look like this. 100/14-34-018-09W4/00

sometimes they make look like this 4-9-62-3W6M in the database. i need to format it so it looks like this 100/04-09-62-03W6/00. Some may or may not be in the format already and if they already have the 100/ or 102 in front for example then ignore that part.

If the first 3 numbers are missing, default to 100 or pad to 100. Replace the M with '' and the end after the / replace with 00 if nothing or pad 00. Also between in the middle between / and /, there are numbers 14-34 etc. if one of those numbers is 6. pad 0 to the left. so its a -06- instead of 6.

Just wondering if someone can point me in the right direction or the easiest way to accomplish this. thanks

Answer 1

To be honest, I think I would approach this in steps. Before starting, save the table somewhere, so nothing inadvertent happens.

update t
    set lsd = lsd + '/00'
    where lsd not like '%/__';

update t
    set lsd = '100/' + lsd
    where lsd not like '%/%/__';

Then:

update t
    set lsd = stuff(lsd, 5, 0, '0')
    where lsd like '%/_-%';

And so on, for each position. That is build up the accurate string using where to fill in one position at a time. This may take a few minutes, but it is probably a simpler and safer process than trying to do it all in one large query.

Answer 2

Check this out:

DECLARE @dummy TABLE(ID INT IDENTITY,YourString VARCHAR(100));
INSERT INTO @dummy VALUES('4-9-62-3W6M')
                        ,('100/4-9-62-3W6M')
                        ,('4-9-62-3W6M/3')
                        ,('102/4-9-62-3W6M')
                        ,('5/4-9-62-3W6/5');

WITH Splitted AS
(
    SELECT 
           ID
          ,d.YourString 
          ,CAST('<x>' + REPLACE(REPLACE(d.YourString,'/','-'),'-','</x><x>') + '</x>' AS XML) AS TheXML
          ,CASE WHEN CHARINDEX('/',d.YourString)>0 AND CHARINDEX('/',d.YourString)<CHARINDEX('-',d.YourString) 
                THEN 1 ELSE 0 
           END AS HasPrefix
    FROM @dummy AS d
) 
,Parted AS
(
    SELECT *
          ,CASE WHEN HasPrefix=1 THEN TheXML.value('(/x)[1]','nvarchar(max)') 
                                 ELSE '100' END AS Prefix
          ,TheXML.value('(/x)[1+sql:column("HasPrefix")][1]','nvarchar(max)') AS Part1
          ,TheXML.value('(/x)[2+sql:column("HasPrefix")][1]','nvarchar(max)') AS Part2
          ,TheXML.value('(/x)[3+sql:column("HasPrefix")][1]','nvarchar(max)') AS Part3
          ,TheXML.value('(/x)[4+sql:column("HasPrefix")][1]','nvarchar(max)') AS Part4
          ,TheXML.value('(/x)[5+sql:column("HasPrefix")][1]','nvarchar(max)') AS PostFix
    FROM Splitted
)
SELECT REPLACE(STR(Prefix,3),' ','0') + '/'
      +REPLACE(STR(Part1,2),' ','0') + '-'
      +REPLACE(STR(Part2,2),' ','0') + '-'
      +REPLACE(STR(Part3,2),' ','0') + '-'
      +CASE WHEN RIGHT(Part4,1)='M' THEN LEFT(Part4,LEN(Part4)-1) ELSE Part4 END + '/'
      +ISNULL(REPLACE(STR(PostFix,2),' ','0'),'00')
FROM Parted

The result

100/04-09-62-3W6/00
100/04-09-62-3W6/00
100/04-09-62-3W6/03
102/04-09-62-3W6/00
005/04-09-62-3W6/05

What is going on?

After inserting some test data into a mock-up table I use one CTE to split your string at the hyphens. Before this, the slashes are replaced with hyphens, so we get each part separately.

A flag HasPrefix tells us, whether the given code has a prefix (like 100/ or not). We use this flag in the second CTE where we retrieve the parts out of the splitted string as add-parameter to find the actual position.

The final SELECT will use STR() and REPLACE for the padding and will concatenate the parts to one single string.

If you want you can set a SELECT * FROM at the end to see all the intermediate steps.