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PHP. Руководство по PHP. 2005 (создание и продвижение сайта)
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PHP. Руководство по PHP. 2005

PDO::__construct

Пред.

След.

PDO::__construct

(no version information, might be only in CVS)PDO::__construct --

Creates a PDO instance representing a connection to a database

Описание

PDO PDO::__construct (string dsn [, string username [, string password [, array driver_options]]])

Внимание

-Эта функция является ЭКСПЕРИМЕНТАЛЬНОЙ.

Поведение этой функции, ее имя и относящаяся к ней документация

могут измениться в последующих версиях PHP без уведомления.

Используйте эту функцию на свой страх и риск.

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. Examples of each

driver are given below:

PDO_DBLIB

The DSN prefix is either sybase:

or mssql: depending on which libraries

it was linked against during compilation.

sybase:host=localhost; dbname=testdb

mssql:host=localhost; dbname=testdb

PDO_FIREBIRD

firebird:User=john;Password=mypass;Database=DATABASE.GDE;DataSource=localhost;Port=3050

PDO_MYSQL

mysql:host=localhost;dbname=testdb

PDO_OCI

To connect via tnsnames.ora, use:

oci:mydb

If using instantclient, use:

oci:dbname=//localhost:1521/testdb

PDO_ODBC

odbc:DSN=SAMPLE;UID=john;PWD=mypass

DSN=SAMPLE refers to the SAMPLE data source configured in the ODBC driver manager.

PDO_PGSQL

pgsql:host=localhost port=5432 dbname=testdb user=john password=mypass

Note, by passing user and password

in the DSN, the username

and password parameters become optional.

If specified, they are glued to the end of the connection string.

PDO_SQLITE

sqlite:/path/to/database

To create a database in memory, use:

sqlite::memory:

sqlite (version 2)

sqlite2:/path/to/database

To create a database in memory, use:

sqlite2::memory:

Замечание:

The SQLite 2 PDO driver provides access to old SQLite 2

databases that you may have created with earlier versions

of PHP. It is recommended that you migrate to SQLite 3 (the

PDO_SQLITE driver), as it has superior features and performance.

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';

try {

$dbh = new PDO($dsn, $user, $password);

} catch (PDOException $e){

echo 'Connection failed: ' . $e->getMessage();

}

?>

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 = '';

try {

$dbh = new PDO($dsn, $user, $password);

} catch (PDOException $e){

echo 'Connection failed: ' . $e->getMessage();

}

?>

Пример 3. Create a PDO instance using an alias

The following example assumes that php.ini contains the following

entry to enable a connection to a MySQL database using only the

alias mydb: 

[PDO]

pdo.dsn.mydb="mysql:dbname=testdb;host=localhost"

<?php

// Connect to an ODBC database using an alias

$dsn = 'mydb';

$user = '';

$password = '';

try {

$dbh = new PDO($dsn, $user, $password);

}catch (PDOException $e){

echo 'Connection failed: ' . $e->getMessage();

}

?>

Пред.

Начало

След.

PDO::commit

Уровень выше

PDO::errorCode

Отвечу на любые вопросы. С уважением, Дмитрий Владимирович.

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