DB_common::provides()
DB_common::provides() – Checks if the DBMS supports a particular feature
Synopsis
boolean provides (
string $feature
)
Описание
Checks if a feature is available for the chosen database type.
Parameter
-
string
$feature -
the feature to check
Possible values are: $featurevalueMeaning prepareThe database does a pre-check of the SQL statement pconnectThe database supports persistent connections transactionsThe database supports transactions limitThe database supports LIMITed SELECT statements
Return value
boolean - TRUE if the feature is supported
Замечание
This function can not be called statically.
The provided information are only hints. Check the documentation of your database system for the real supported features. I.e. MySQL supports transactions, but not for every table type.
Пример
Using provides()
<?php
// Once you have a valid DB object named $db...
if ($db->provides('pconnect')) {
echo "Persistent connections are allowed.\n";
}
?>