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Sagot :
A Data Source Name is a string that includes the host, port, and name of the database that will be used to connect to the database in a PHP application that uses PDO.
The data-access abstraction layer provided by PHP's PDO allows you to execute queries and retrieve data using the same functions regardless of the database you're using. PDO is not a database abstraction; it doesn't rewrite SQL or mimic inaccessible features. Among many other databases, PDO (PHP Data Objects) is a general database abstraction layer that supports MySQL. It offers prepared statements and a lot of flexibility in the way that data is returned. The details necessary to establish a connection to the database are contained in the Data Source Name, or DSN. A DSN typically starts with the name of the PDO driver, is followed by a colon, and then the connection syntax unique to that driver. The PDO driver-specific documentation provides additional details. The DSN establishes the kind of database.
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