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(no version information, might be only in CVS)
PDO::__construct -- Creates a PDO instance representing a connection to a databaseOstrzeżenie |
Ta funkcja jest w stadium EKSPERYMENTALNYM. Oznacza to, że zachowanie funkcji, jej nazwa, w zasadzie wszystko udokumentowane tutaj może zostać zmienione w przyszłych wersjach PHP bez wcześniejszego uprzedzenia. Używaj tej funkcji na własne ryzyko. |
Creates a PDO instance to represent a connection to the requested database.
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:
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
firebird:User=john;Password=mypass;Database=DATABASE.GDE;DataSource=localhost;Port=3050
mysql:host=localhost;dbname=testdb
To connect via tnsnames.ora, use:
oci:mydb
If using instantclient, use:
oci:dbname=//localhost:1521/testdb
odbc:DSN=SAMPLE;UID=john;PWD=mypass
DSN=SAMPLE refers to the SAMPLE data source configured in the ODBC driver manager.
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.
sqlite:/path/to/database
To create a database in memory, use:
sqlite::memory:
The dsn parameter supports three different methods of specifying the arguments required to create a database connection:
dsn contains the full DSN.
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
dsn consists of a name name that maps to pdo.dsn.name in php.ini defining the DSN string.
Notatka: The alias must be defined in php.ini, and not .htaccess or httpd.conf
The user name for the DSN string. This parameter is optional for some PDO drivers.
The password for the DSN string. This parameter is optional for some PDO drivers.
A key=>value array of driver-specific connection options.
PDO::construct() throws a PDOException if the attempt to connect to the requested database fails.
Przykład 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:
The PHP script can then create a database connection by simply passing the uri: parameter and pointing to the file URI:
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Przykład 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:
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Generated: 2007-01-26 18:02:35