Jim Lucas wrote:
mikesd1@xxxxxxxxxxx wrote:
Ok, so just that I am clear, you are SELECTing and pulling all the data
that you are submitting in the above INSERT statement from the DB
initially,
then you are only modifying the confirm_number value and then re-
submitting all the values, as they originally were,
Well, actually when all is said and done, a new record will be created with
new information (Name, phone, email, etc) and the confirm_number is the
previous+1
Seems like a perfect candidate for an auto-inc field, though mysql
doesn't let you have multiple in the same table (afaik).
# Now prepare your statement
$SQL = "
SET @confirm_number=(SELECT (MAX(confirm_number)+1) FROM `contacts`);
INSERT INTO `contacts` (
`first_name`,
`last_name`,
`email`,
`phn_number`,
`address`,
`city`,
`state`,
`zip`,
`dates`,
`comments`,
`confirm_number`
) VALUES (
'{$FirstName}',
'{$LastName}',
'{$Email}',
'{$Phone}',
'{$Address}',
'{$City}',
'{$selected_state}',
'{$Zip}',
'{$newdate}',
'{$Comments}',
@confirm_number
)
SELECT @confirm_number AS confirm_number;
";
You do have a race condition, you can end up with 2 of the same
confirm_numbers (you'd have to be unlucky, but it can happen).
2 hits at the same time = 2 selects getting the same
max(confirm_number), which results in 2 inserts with the same number.
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