Solved

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

Posted on 2014-02-19
3
1,173 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
3 Comments
 
LVL 65

Expert Comment

by:Jim Horn
Comment Utility
>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:
ScottPletcher earned 500 total points
Comment Utility
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
Comment Utility
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

Maximize Your Threat Intelligence Reporting

Reporting is one of the most important and least talked about aspects of a world-class threat intelligence program. Here’s how to do it right.

Join & Write a Comment

Suggested Solutions

Entering time in Microsoft Access can be difficult. An input mask often bothers users more than helping them and won't catch all typing errors. This article shows how to create a textbox for 24-hour time input with full validation politely catching …
Using SQL Scripts we can save all the SQL queries as files that we use very frequently on our database later point of time. This is one of the feature present under SQL Workshop in Oracle Application Express.
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…
Polish reports in Access so they look terrific. Take yourself to another level. Equations, Back Color, Alternate Back Color. Write easy VBA Code. Tighten space to use less pages. Launch report from a menu, considering criteria only when it is filled…

744 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

14 Experts available now in Live!

Get 1:1 Help Now