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Insert if Exists else return id

Posted on 2006-07-06
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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
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Question by:bmarshallbri
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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)
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Raynard7 earned 500 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
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Author Comment

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

Much appreciated.
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