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INSERT OR UPDATE?

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Hello all,

I am writing an app in PHP that uses a PostGres database.
One thing i have noticed is that what should/could be a single line of
SQL code takes about 6 lines of PHP.  This seem wasteful and redundant
to me.

Here is a sample of what I'm talking about ($db is a PDO already
defined and created).

$query[1] = "UPDATE my.table, SET somefield = '$someval' WHERE
somecondition";
$query[2] = "INSERT INTO my.table (somefield) VALUES ('$someval')";
if(!$db->query($query[1])){
    $db->query($query[2]);
}

What I'm curious to know is if there is some way to simplify this,
either buy some PHP builtin or extension, or possibly something in SQL
I am missing.  It seems to me that "UPDATE OR INSERT", should be valid,
but I can't seem to find anything relevant at all about it.

Anyways I hope you don't mind, but I'm crossposting this to
pgsql.general and comp.lang.php to see if I can get some information on
the subject.


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