Introduction - Connect
Описание
To connect to a database you have to use the function connect(), which requires a valid DSN as the first parameter. This parameter can either be a string or an array. If using an array, the array used gets merged with the default information:
$dsn = array(
'phptype' => false,
'dbsyntax' => false,
'username' => false,
'password' => false,
'protocol' => false,
'hostspec' => false,
'port' => false,
'socket' => false,
'database' => false,
);
Any elements you set override the defaults and the remainder stay at their defaults.
The second parameter is the optional $options
array that can contain runtime configuration settings for this package.
See
setOption() for more information on the
available settings.
In case of success you get a new instance of the database class. It is strongly recommended to check this return value with isError().
To disconnect use the method disconnect() from your database class instance.
Connect and disconnect
<?php
require_once 'DB.php';
$dsn = 'pgsql://someuser:apasswd@localhost/thedb';
$options = array(
'debug' => 2,
'portability' => DB_PORTABILITY_ALL,
);
$db =& DB::connect($dsn, $options);
if (PEAR::isError($db)) {
die($db->getMessage());
}
// ...
$db->disconnect();
?>
Connect using an array for the DSN information
<?php
require_once 'DB.php';
$dsn = array(
'phptype' => 'pgsql',
'username' => 'someuser',
'password' => 'apasswd',
'hostspec' => 'localhost',
'database' => 'thedb',
);
$options = array(
'debug' => 2,
'portability' => DB_PORTABILITY_ALL,
);
$db =& DB::connect($dsn, $options);
if (PEAR::isError($db)) {
die($db->getMessage());
}
?>
When connecting to SQLite using a DSN array, the value
of the mode element must be a string:
<?php
$dsn = array(
'phptype' => 'sqlite',
'database' => 'thedb',
'mode' => '0644',
);
?>
Connect to MySQLi via SSL using an array for the DSN information
The ssl element of the
$options array must be set to
TRUE in order for SSL to work. Each of the extra
elements in the $dsn array
(key through cipher
in the example below) are optional.
<?php
require_once 'DB.php';
$dsn = array(
'phptype' => 'mysqli',
'username' => 'someuser',
'password' => 'apasswd',
'hostspec' => 'localhost',
'database' => 'thedb',
'key' => 'client-key.pem',
'cert' => 'client-cert.pem',
'ca' => 'cacert.pem',
'capath' => '/path/to/ca/dir',
'cipher' => 'AES',
);
$options = array(
'ssl' => true,
);
$db =& DB::connect($dsn, $options);
if (PEAR::isError($db)) {
die($db->getMessage());
}
?>
Connect to a PostgreSQL database via a socket
<?php
require_once 'DB.php';
$dsn = 'pgsql://someuser:apasswd@unix(/tmp)/thedb';
$options = array(
'debug' => 2,
'portability' => DB_PORTABILITY_ALL,
);
$db =& DB::connect($dsn, $options);
if (PEAR::isError($db)) {
die($db->getMessage());
}
?>