Problem with ON DUPLICATE query

Here is an article that may be useful to you:
Duplicate Key Update

Ray_Paseur;

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'country UPDATE value='3.672971', updated_datetime='1356480009', updated_d' at line 6

country is an index.

Corrected an error, but still the same error message

$sql = "
INSERT INTO currency_exchange_rates
	(base, country, value, updated, updated_datetime) 
VALUES
	('{$this->base}', '$code','$item','{$exchangeRates->timestamp}','".date("Y-m-d H:i:s",$exchangeRates->timestamp)."')
ON DUPLICATE
	country
UPDATE
	value='$item', updated='{$exchangeRates->timestamp}', updated_datetime='".date("Y-m-d H:i:s",$exchangeRates->timestamp)."'
WHERE
	country='$code'
";

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You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'country UPDATE value='3.672971', updated='1356480009', updated_datetime='' at line 6

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The "Is the column country an index?" question kinda 'tricked' it for me, think I fixed the issue. This seems to work:

$sql = "
INSERT INTO currency_exchange_rates
	(base, country, value, updated, updated_datetime) 
VALUES
	('{$this->base}', '$code','$item','{$exchangeRates->timestamp}','".date("Y-m-d H:i:s",$exchangeRates->timestamp)."')
ON DUPLICATE KEY UPDATE
	value='$item', updated='{$exchangeRates->timestamp}', updated_datetime='".date("Y-m-d H:i:s",$exchangeRates->timestamp)."'
";

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I guess "ON DUPLICATE country UPDATE value='$item', updated=....." is not valid.

Make a Google search for "on duplicate key update mysql php" and see if the answers win the day.  Best regards and merry Christmas, ~Ray

The only thing I have to add to this is that the ON DUPLICATE KEY UPDATE command line only works with Unique or Primary Key values.

Thanks Wadehults, will make sure that is the case :)

Man Page here: http://dev.mysql.com/doc/refman/5.0/en/insert-on-duplicate.html
Important Note here:  In general, you should try to avoid using an ON DUPLICATE KEY UPDATE clause on tables with multiple unique indexes.

That tells me that you want country to be the index and the only index.