What is the purpose of PDO?

What is the purpose of PDO?

PDO provides a data-access abstraction layer, which means that, regardless of which database you’re using, you use the same functions to issue queries and fetch data. PDO does not provide a database abstraction; it doesn’t rewrite SQL or emulate missing features.

What is PDO in programming?

PDO is an acronym for PHP Data Objects. PDO is a lean, consistent way to access databases. This means developers can write portable code much easier. PDO is not an abstraction layer like PearDB. PDO is a more like a data access layer which uses a unified API (Application Programming Interface).

Can you mix PDO and mysqli?

Yes, it is possible.

Which is PDO function returns the ID of the last inserted row?

PDO::lastInsertId. Description. Returns the ID of the last inserted row, or the last value from a sequence object, depending on the underlying driver. For example, PDO_PGSQL requires you to specify the name of a sequence object for the name parameter.

Can a PDO be bound to more than one parameter?

An array of values with as many elements as there are bound parameters in the SQL statement being executed. All values are treated as PDO::PARAM_STR . Multiple values cannot be bound to a single parameter; for example, it is not allowed to bind two values to a single named parameter in an IN () clause.

Why does PDO _ pgSQL not return a consistent result?

For example, PDO_PGSQL requires you to specify the name of a sequence object for the name parameter. This method may not return a meaningful or consistent result across different PDO drivers, because the underlying database may not even support the notion of auto-increment fields or sequences.

What happens when PDO errmode _ exception is set?

This function does not throw any error when PDO::ERRMODE_EXCEPTION is set, instead, it throws a PDOException. Tested on: Windows 10, PHP 5.5.35, mysqlnd 5.0.11, MySQL 5.6.30. If you’re going to derive PDOStatement to extend the execute () method, you must define the signature with a default NULL argument, not an empty array.