Solved

Handling Null Values in BULK INSERT

Posted on 2008-06-19
6
1,309 Views
Last Modified: 2012-06-21
We have a Excel file which contains some 50000 records, now while uploading this Excel
we first convert it into Text formate. In this Text file the 50000 records will be saved and the remaining
15000 records will be "null".
   Now while inserting this text file Using Bulk insert Command in SQL 2000, the "null" values
are also getting inserted in Databse which is not required
 
 Can you please suggest a solution, where the "null" values can be avoided while running Bulk
Insert


 
 
0
Comment
Question by:Venkatkp007
6 Comments
 
LVL 19

Accepted Solution

by:
frankytee earned 168 total points
Comment Utility
that may be limitation of bulk insert. when importing data into sql i usually using a "staging" table, which is identical in structure to your "real" table but with no constraints nor indexes etc to ensure the best speed. then after it imports do the necessary cleaning etc which in your case is to remove the "nulls" (or just ignore them) when inserting into the real table.
0
 
LVL 14

Expert Comment

by:Jagdish Devaku
Comment Utility
Hi,

I think using Import for SQL Management Studio (SMS) is the better option than using BULK INSERT.

Right click on the database  to which you want to import the data.
goto -> Tasks -> Import Data... then follow the steps as it asks. ()

While it asks for Datasource, select MIcrosoft Excel.



0
 
LVL 51

Assisted Solution

by:Mark Wills
Mark Wills earned 336 total points
Comment Utility
Yeah bulk insert is a bit "dumb" but that is what it was designed for...

If you need more finesse, then you can goto openrowset, or even create a linked server to the spreadsheet itself and save having to convert it...

Even still, like franytee, I always use a staging table, do all the validation / verification on that and then import "clean" records into the real database table.

You will need to swap the appropriate spreadsheet name (c:\example3.xls) and the worksheet ("example3$") , but hopefully will be self explanatory enough...

You can then do things like select where a column is not null etc...


Select * FROM OPENROWSET('Microsoft.Jet.OLEDB.4.0', 'Excel 8.0;Database=c:\example3.xls;HDR=YES', 'SELECT * FROM [example3$]')
 

-- or below for a linked server
 

EXEC sp_addlinkedserver MyExcel,

     'Jet 4.0',

     'Microsoft.Jet.OLEDB.4.0',

     'c:\example3.xls', 

      NULL,

     'Excel 5.0;'
 

GO
 

--Set up login mappings (just ADMIN - jet wants something).

EXEC sp_addlinkedsrvlogin MyExcel, FALSE, NULL, Admin, NULL

GO
 

--List the tables in the linked server (these are the worksheet names).

EXEC sp_tables_ex MyExcel

GO
 

--List the contents of the 'Sheet1' worksheet 

select * from MyExcel...example3$
 

--Define a table - permanent or othwise - suggest otherwise as staging

if exists (select * from information_schema.tables where table_name = 'my_tmp_Sheet1') drop table my_tmp_Sheet1

select * into my_tmp_Sheet1 from MyExcel...Sheet1$
 

-- now from here you will have to adapt 

select * from my_tmp_Sheet1
 
 

-- now can unpack that table into a real home...

-- fetch each record from the cursor, and insert / update a 'real' table

-- then clean up
 
 

-- remove 'staging' area
 

if exists (select * from information_schema.tables where table_name = 'my_tmp_Sheet1') drop table my_tmp_Sheet1
 

-- remove added logins

sp_droplinkedsrvlogin 'MyExcel', 'Admin'

-- remove server

sp_dropserver 'MyExcel', 'droplogins';

Open in new window

0
 

Author Comment

by:Venkatkp007
Comment Utility
Mark,
Is this OPENROWSET works with .txt file also?
Now we are facing a new problem.
We have  4 columns in the text file and the field terminator is tab.
we use bulk statement as :
BULK INSERT Temp_Locations2 FROM 'E:\upload\KGI Files\TDC Song Zone1.txt' WITH (FIRSTROW = 2,FIELDTERMINATOR = '      ',ROWTERMINATOR = '\n')
For this text file last column is null. Some rows have field terminator as tab after 3rd column and some dont have.
so if it doesnt find the field terminator, it is inserting the next row in the current row itself.
How can this be handled?
0
 
LVL 51

Assisted Solution

by:Mark Wills
Mark Wills earned 336 total points
Comment Utility
Yes, and a few other options as well. Normally need to get involved with sql "format files" when dealing with flat files... kind of like a primitive schema...

P.S.  use '\t' as fieldterminator....

If it is only 4 columns, import as a single column and a bit of TSQL code will quickly break it up for you...

Want to send through a zipped copy of your file ?
0

Featured Post

Free Gift Card with Acronis Backup Purchase!

Backup any data in any location: local and remote systems, physical and virtual servers, private and public clouds, Macs and PCs, tablets and mobile devices, & more! For limited time only, buy any Acronis backup products and get a FREE Amazon/Best Buy gift card worth up to $200!

Join & Write a Comment

Introduction This article will provide a solution for an error that might occur installing a new SQL 2005 64-bit cluster. This article will assume that you are fully prepared to complete the installation and describes the error as it occurred durin…
I've encountered valid database schemas that do not have a primary key.  For example, I use LogParser from Microsoft to push IIS logs into a SQL database table for processing and analysis.  However, occasionally due to user error or a scheduled task…
Excel styles will make formatting consistent and let you apply and change formatting faster. In this tutorial, you'll learn how to use Excel's built-in styles, how to modify styles, and how to create your own. You'll also learn how to use your custo…
Get a first impression of how PRTG looks and learn how it works.   This video is a short introduction to PRTG, as an initial overview or as a quick start for new PRTG users.

762 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

10 Experts available now in Live!

Get 1:1 Help Now