Surely there is a way to import CSV data in this situation?

• Atat Rowcount

  Default port

  Points: 1453

  More actions

  January 25, 2011 at 10:38 am

  #1278008

  Ok, here goes:

  CREATE Function ChangeDelimiters(

  @LINEvarchar(max),

  @SEARCHchar(1),

  @REPLACEchar(1))

  Returns Table As Return

  -- Replace @SEARCH with @REPLACE when found in @LINE between a pair of double quotes (e.g. 1,2,3,"4,5",6,7 with SEARCH ',' and REPLACE '!' becomes 1,2,3,"4!5",6,7)

  -- Table with 10 dummy rows

  With A1 As(

  Select 1 N Union All Select 1 Union All Select 1 Union All Select 1 Union All Select 1 Union All

  Select 1 Union All Select 1 Union All Select 1 Union All Select 1 Union All Select 1),

  -- Increase to 100000

  A2 As (Select 1 N From A1 a Cross Join A1 b),

  A3 As (Select 1 N From A2 a Cross Join A2 b),

  A4 As (Select 1 N From A3 a Cross Join A1 b),

  -- Table with one row per character in the line, numbered N

  TALLY As (Select Top (Len(@LINE)) ROW_NUMBER() Over (Order By A4.N) N From A4),

  -- Table with one row per character in the line, and a second column indicating the character itself

  ITEM_SPLIT As (

  SelectN As ITEM_ORDER,

  SubString(@LINE,N,1) As ITEM

  FromTALLY

  WhereN <= Len(@LINE)),

  -- Table with the start and end positions of the double quotes in @LINE

  QUOTE_REP As (

  Select((ROW_NUMBER() Over (Order By ITEM_ORDER)+1)/2) As QUOTE_POS, -- int (position+1)/2 will give start and end (1=1,2=1.5=1,3=2,4=2.5=2 etc)

  ITEM_ORDER,

  ITEM

  FromITEM_SPLIT

  WhereITEM = '"'),

  -- Table with one row for each replacement, giving start and end positions of quotes

  QUOTE_CHANGE As (

  SelectQUOTE_POS,

  Min(ITEM_ORDER) As START_POS,

  Max(ITEM_ORDER) As END_POS

  FromQUOTE_REP

  Group By QUOTE_POS),

  -- Table with one rows per character in the *altered* @LINE

  REJOIN As (

  SelectCase When qc.QUOTE_POS Is Not Null And its.ITEM = @SEARCH Then @REPLACE Else its.ITEM End As ITEM

  FromITEM_SPLIT its

  Left Join QUOTE_CHANGE qc On its.ITEM_ORDER Between qc.START_POS And qc.END_POS)

  -- Concat each row in REJOIN to form the result

  SelectRESULT = ((Select '' + ITEM From REJOIN For Xml Path(''),TYPE).value('.','varchar(max)'))

• WayneS

  SSC Guru

  Points: 95460

  More actions

  January 25, 2011 at 11:25 am

  #1278049

  Brian - You'll get better performance with a properly constructed permanent tally table instead of a virtual one. Not sure how to do that? See The "Numbers" or "Tally" Table: What it is and how it replaces a loop.[/url]

  Wayne
  Microsoft Certified Master: SQL Server 2008
  Author - SQL Server T-SQL Recipes

  ---

  If you can't explain to another person how the code that you're copying from the internet works, then DON'T USE IT on a production system! After all, you will be the one supporting it!

  ---

  Links:
  For better assistance in answering your questions
  Performance Problems
  Common date/time routines
  Understanding and Using APPLY Part 1 & Part 2

• Lynn Pettis

  SSC Guru

  Points: 442467

  More actions

  January 25, 2011 at 12:01 pm

  #1278079

  Wayne, it really depends. There seems to be a tipping point where a dynamic tally table beats a physical tally table.

  Don't have specifics, and it could just be my system or perception.

• Jeff Moden

  SSC Guru

  Points: 1004339

  More actions

  January 30, 2011 at 7:55 pm

  #1280233

  Do you remember when all this text qualified CSV stuff that everyone has a problem with used to be child's play if not a touch slow? 😉

  --===== Setup the Jet driver to look at a directory in the qualified text (true CSV) mode

  EXEC sp_addlinkedserver TxtSrv01, 'Jet 4.0', 'Microsoft.Jet.OLEDB.4.0', 'C:\Temp', NULL, 'Text';

  --===== Add a trusted login to the new linked server

  EXEC sp_addlinkedsrvlogin TxtSrv01, FALSE, NULL, NULL;

  --===== See a list of text files from the directory we setup on the linked server

  EXEC sp_tables_ex TxtSrv01;

  --===== Read the content of a given file name [TestInsert#txt] using the true CSV mode

  SELECT * FROM TxtSrv01...[TestInsert#txt];

  --===== All done... throw away the linked server

  EXEC sp_dropserver 'TxtSrv01','droplogins';TestInsert#txt]

  --Jeff Moden

  ---

  RBAR is pronounced "ree-bar" and is a "Modenism" for Row-By-Agonizing-Row.
  First step towards the paradigm shift of writing Set Based code:
  ________Stop thinking about what you want to do to a ROW... think, instead, of what you want to do to a COLUMN.

  Change is inevitable... Change for the better is not.
  

  ---

  Helpful Links:
  How to post code problems
  How to Post Performance Problems
  Create a Tally Function (fnTally)