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Website Programming in PHP / MYSQL
pg_get_notify
(PHP 4 >= 4.3.0, PHP 5)
pg_get_notify — Gets SQL NOTIFY message
Description
pg_get_notify() gets notifications generated by a NOTIFY SQL command. To receive notifications, the LISTEN SQL command must be issued.
Parameters
- connection
-
PostgreSQL database connection resource.
- result_type
-
An optional parameter that controls how the returned array is indexed. result_type is a constant and can take the following values: PGSQL_ASSOC, PGSQL_NUM and PGSQL_BOTH. Using PGSQL_NUM, pg_get_notify() will return an array with numerical indices, using PGSQL_ASSOC it will return only associative indices while PGSQL_BOTH, the default, will return both numerical and associative indices.
Return Values
An array containing the NOTIFY message name and backend PID. Otherwise if no NOTIFY is waiting, then FALSE is returned.
Examples
Example #1 PostgreSQL NOTIFY message
<?php
$conn = pg_pconnect("dbname=publisher");
if (!$conn) {
echo "An error occured.\n";
exit;
}
// Listen 'author_updated' message from other processes
pg_query($conn, 'LISTEN author_updated;');
$notify = pg_get_notify($conn);
if (!$notify) {
echo "No messages\n";
} else {
print_r($notify);
}
?>
