Solved

Insert if Exists else return id

Posted on 2006-07-06
3
292 Views
Last Modified: 2008-03-10
I'm not really up to speed on all of the option of mysql. I'm developing for 4.1 and I would like to write an insert statement that enforces a unique email address in the email column. If the insert finds a pre-existing match in the email column then I would like it to return my id column value for that record or insert and return the resulting ID after the insert.

Is this possible or do I need to manually query that table first and then insert on the results? I am using InnoDB for my table engines and I am enforcing unique values on that email field.

Thanks
0
Comment
Question by:bmarshallbri
3 Comments
 
LVL 19

Expert Comment

by:Kim Ryan
ID: 17055666
Try creating a unique index from your email address column. This will prevent insertion of duplicates. You will still need to manually detect when an insert failed because of duplicates, and then retireve the id of ttat record.

create unique index email_index on email ( email_address)
0
 
LVL 35

Accepted Solution

by:
Raynard7 earned 125 total points
ID: 17055685
I would do this in two steps;

I would submit the query
select t.id_Column from schemaName.tableName t where t.emailField = 'abcd@wef.com'

If this returns no records then

Insert into schemaName.tableName (emailField) values ('abcd@wef.com')

I agree you need a unique index
0
 

Author Comment

by:bmarshallbri
ID: 17059895
Great, thanks. That works nicely.

Much appreciated.
0

Featured Post

PRTG Network Monitor: Intuitive Network Monitoring

Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

Question has a verified solution.

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

Fore-Foreword Today (2016) Maxmind has a new approach to the distribution of its data sets.  This article may be obsolete.  Instead of using the examples here, have a look at the MaxMind API (https://www.maxmind.com/en/geolite2-developer-package). …
All XML, All the Time; More Fun MySQL Tidbits – Dynamically Generate XML via Stored Procedure in MySQL Extensible Markup Language (XML) and database systems, a marriage we are seeing more and more of.  So the topics of parsing and manipulating XM…
This video shows how to use Hyena, from SystemTools Software, to bulk import 100 user accounts from an external text file. View in 1080p for best video quality.
The Email Laundry PDF encryption service allows companies to send confidential encrypted  emails to anybody. The PDF document can also contain attachments that are embedded in the encrypted PDF. The password is randomly generated by The Email Laundr…

830 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