Creates a PDO instance to represent a connection to the requested
database.
Список параметров
dsn
The Data Source Name, or DSN, contains the information required to
connect to the database.
In general, a DSN consists of the PDO driver name, followed by a colon,
followed by the PDO driver-specific connection syntax. Further
information is available from the PDO
driver-specific documentation.
The dsn parameter supports three
different methods of specifying the arguments required to create
a database connection:
Driver invocation
dsn contains the full DSN.
URI invocation
dsn consists of uri:
followed by a URI that defines the location of a file containing
the DSN string. The URI can specify a local file or a remote URL.
uri:file:///path/to/dsnfile
Aliasing
dsn consists of a name
name that maps to
pdo.dsn.name in php.ini
defining the DSN string.
Замечание:
The alias must be defined in php.ini, and not .htaccess or httpd.conf
username
The user name for the DSN string. This parameter is optional for
some PDO drivers.
password
The password for the DSN string. This parameter is optional for
some PDO drivers.
driver_options
A key=>value array of driver-specific connection options.
Возвращаемые значения
Returns a PDO object on success.
Исключения
PDO::construct() throws a PDOException if the attempt
to connect to the requested database fails.
Примеры
Пример 1. Create a PDO instance via driver invocation
<?php /* Connect to an ODBC database using driver invocation */ $dsn = 'mysql:dbname=testdb;host=127.0.0.1'; $user = 'dbuser'; $password = 'dbpass';
Пример 2. Create a PDO instance via URI invocation
The following example assumes that the file
/usr/local/dbconnect exists with file permissions
that enable PHP to read the file. The file contains the PDO DSN to
connect to a DB2 database through the PDO_ODBC driver:
odbc:DSN=SAMPLE;UID=john;PWD=mypass
The PHP script can then create a database connection by simply
passing the uri: parameter and pointing to
the file URI:
<?php /* Connect to an ODBC database using driver invocation */ $dsn = 'uri:file:///usr/local/dbconnect'; $user = ''; $password = '';