PEAR Справочное руководство
Пред. След.

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.

Параметр

string $feature

the feature to check

Таблица 35-1. Possible values are:

$feature value Meaning
prepare The database does a pre-check of the SQL statment
pconnect The database supports persistent connections
transactions The database supports transactions
limit The database supports LIMITed SELECT statments

Возвращаемое значение

boolean - TRUE if the feature is supported

Заметка

Эта функция не должна вызываться статически.

Внимание

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

Пример 35-1. Using provides()

<?php
// Once you have a valid DB object named $db...
if ($db->provides('pconnect')) {
    echo "Persistent connections are allowed.\n";
}
?>
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DB_common::prepare() Уровень выше DB_common::query()
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