Adding multiple records from a string - sql-server

Question

I have a string of email addresses. For example, "a#a.com; b#a.com; c#a.com"
My database is:
record | flag1 | flag2 | emailaddresss
--------------------------------------------------------
1 | 0 | 0 | a#a.com
2 | 0 | 0 | b#a.com
3 | 0 | 0 | c#a.com
What I need to do is parse the string, and if the address is not in the database, add it.
Then, return a string of just the record numbers that correspond to the email addresses.
So, if the call is made with "A#a.com; c#a.com; d#a.com", the rountine would add "d#a.com", then return "1, 3,4" corresponding to the records that match the email addresses.
What I am doing now is calling the database once per email address to look it up and confirm it exists (adding if it doesn't exist), then looping thru them again to get the addresses 1 by 1 from my powershell app to collect the record numbers.
There has to be a way to just pass all of the addresses to SQL at the same time, right?
I have it working in powershell.. but slowly..
I'd love a response from SQL as shown above of just the record number for each email address in a single response. That is, "1,2,4" etc.
My powershell code is:
$EmailList2 = $EmailList.split(";")
# lets get the ID # for each eamil address.
foreach($x in $EmailList2)
{
$data = exec-query "select Record from emailaddresses where emailAddress = #email" -parameter #{email=$x.trim()} -conn $connection
if ($($data.Tables.record) -gt 0)
{
$ResponseNumbers = $ResponseNumbers + "$($data.Tables.record), "
}
}
$ResponseNumbers = $($ResponseNumbers+"XX").replace(", XX","")
return $ResponseNumbers

Answer 1

You'd have to do this in 2 steps. Firstly INSERT the new values and then use a SELECT to get the values back. This answer uses delimitedsplit8k (not delimitedsplit8k_LEAD) as you're still using SQL Server 2008. On the note of 2008 I strongly suggest looking at upgrade paths soon as you have about 6 weeks of support left.
You can use the function to split the values and then INSERT/SELECT appropriately:
DECLARE #Emails varchar(8000) = 'a#a.com;b#a.com;c#a.com';
WITH Emails AS(
SELECT DS.Item AS Email
FROM dbo.DelimitedSplit8K(#Emails,';') DS)
INSERT INTO YT (emailaddress) --I don't know what the other columns value should be, so have excluded
SELECT E.Email
FROM dbo.YourTable YT
LEFT JOIN Emails E ON YT.emailaddress = E.Email
WHERE E.Email IS NULL;
SELECT YT.record
FROM dbo.YourTable YT
JOIN dbo.DelimitedSplit8K(#Emails,';') DS ON DS.Item = YT.emailaddress;