Solved

SQL Import Data from Text File - Validate Each Client ID before insert

Posted on 2014-02-19
3
1,209 Views
Last Modified: 2014-02-19
Hello Experts,

I have a tab delimited text file that I'll be using as a basis for periodic data import into my SQL 2005 database.  One of the fields in the text file is ClientID.  

What I need to do is loop through each row of the text file and determine whether the ClientID exists in our Clients table.  

If it does exist, it should go ahead and run a couple of different Insert queries in order to add specified fields from the text file row as a new record in certain tables.

If it does NOT exist, I need it to write out the entire row from the text file to an ImportError table.

I have all the code written for opening the text file and querying from it using some nice OPENROWSET code and I also have the Update queries written for both conditions (when ClientID is valid and when it is not valid).

What I Need is:

Guidance on how to best handle the initial step - check to see if the ClientID is valid in the Clients table and then direct the stored proc to carry out the appropriate update queries

I was thinking of the following plan:

Setting up a temporary table with 2 columns (ClientID as INT, Status as BIT)
Looping through the text file to find all distinct ClientIDs (can be more than 1 row with same ClientID)
Write out the ClientID and if valid, set status to 1, if not valid, set status to 0
Then, once the temp table is populated, use that as a To Do list of sorts and loop through each record using some sort of For Each or cursor functionality in order to read the status bit value of each row and either do the appropriate inserts (if 1) or write to error table (if 0).

I look forward to your creative ideas and appreciate your assistance!
0
Comment
Question by:dpmoney
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
3 Comments
 
LVL 66

Expert Comment

by:Jim Horn
ID: 39871083
>What I need to do is loop through each row of the text file and determine whether the ClientID exists in our Clients table.  

Don't loop.  What you just described can all be handled in the T-SQL MERGE statement., other than it will execute only one statement for any given action instead of 'a couple'.

But if you tack on an OUTPUT clause at the end, it'll handle subsequent statements.
0
 
LVL 69

Accepted Solution

by:
Scott Pletcher earned 500 total points
ID: 39871087
You need an UPDATE query for the main table, with an INNER JOIN, and an INSERT query for the ImportError table, with an OUTER JOIN.  [ixnay on the oopinglay!]

UPDATE mt
SET
FROM dbo.main_table mt
INNER JOIN (
    SELECT ...
    FROM OPENROWSET(...)
) AS trans ON
    trans.ClientID = mt.ClientID


INSERT INTO dbo.importError
SELECT ...
FROM OPENROWSET(...) AS trans
LEFT OUTER JOIN dbo.main_table mt ON
    mt.clientID = trans.clientID
WHERE
    mt.ClientID IS NULL
0
 

Author Closing Comment

by:dpmoney
ID: 39871290
You are indeed a prodigy!  

I was able to take your example code and map it to my SQL without issue - works like a champ!  If I could give you bonus points for the pig Latin, I would.  

Thanks again!
0

Featured Post

[Live Webinar] The Cloud Skills Gap

As Cloud technologies come of age, business leaders grapple with the impact it has on their team's skills and the gap associated with the use of a cloud platform.

Join experts from 451 Research and Concerto Cloud Services on July 27th where we will examine fact and fiction.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Your data is at risk. Probably more today that at any other time in history. There are simply more people with more access to the Web with bad intentions.
This article shows how to get a list of available printers for display in a drop-down list, and then to use the selected printer to print an Access report or a Word document filled with Access data, using different syntax as needed for working with …
Video by: Steve
Using examples as well as descriptions, step through each of the common simple join types, explaining differences in syntax, differences in expected outputs and showing how the queries run along with the actual outputs based upon a simple set of dem…
This is a high-level webinar that covers the history of enterprise open source database use. It addresses both the advantages companies see in using open source database technologies, as well as the fears and reservations they might have. In this…

636 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