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As a result, half of PDO's features remain in obscurity and are almost never used by PHP developers, who, as a result, are constantly trying to reinvent the wheel which Unlike those, this tutorial is written by someone who has used PDO for many years, dug through it, and answered thousands questions on Stack Overflow (the sole gold PDO badge bearer). The abstraction, however, is two-fold: one is widely known but less significant, while another is obscure but of most importance.Following the mission of this site, this article will disprove various delusions and bad practices, while showing the right way instead. Everyone knows that PDO offers unified interface to access many different databases.For all other cases you cannot use PDO prepared statements at all: neither an identifier, or a comma-separated list, or a part of a quoted string literal or whatever else arbitrary query part cannot be bound using a prepared statement.Workarounds for the most frequent use cases can be found in the corresponding part of the article Sometimes you can use prepared statements for the multiple execution of a prepared query.There are many tutorials on PDO already, but unfortunately, most of them fail to explain the real benefits of PDO, or even promote rather bad practices.The only two exceptions are and hashphp.org, but they miss a lot of important information.
It fetches a single row from database, and moves the internal pointer in the result set, so consequent calls to this function will return all the resulting rows one by one.If no variables are going to be used in the query, you can use the PDO::query() method.It will run your query and return special object of PDOStatement class which can be roughly compared to a resource, returned by function and thrown into the harsh world of Data Objects: PDO has prepared statements support out of the box.Also note that despite a widespread delusion, no " it has no side effects to deal with.It is very important to understand which query parts you can bind using prepared statements and which you cannot.