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1. #SPLICE CAST IRON PIPE WITH COMPRESSION COUPLING DRIVER#
2. #SPLICE CAST IRON PIPE WITH COMPRESSION COUPLING CODE#
3. #SPLICE CAST IRON PIPE WITH COMPRESSION COUPLING PASSWORD#

Important notes for the late mysql extension users: With all aforementioned variables properly set, we will have proper PDO instance in $pdo variable. $pdo = new PDO ( $dsn, $user, $pass, $options ) PDO :: ATTR_DEFAULT_FETCH_MODE => PDO :: FETCH_ASSOC , PDO :: ATTR_ERRMODE => PDO :: ERRMODE_EXCEPTION , $dsn = "mysql:host= $host dbname= $db charset= $charset " Here goes an example for mysql: $host = '127.0.0.1' Note that it's important to follow the proper format - no spaces or quotes or other decorations have to be used in DSN, but only parameters, values and delimiters, as shown in the manual.

#SPLICE CAST IRON PIPE WITH COMPRESSION COUPLING DRIVER#

Where DSN is a semicolon-delimited string, consists of param=value pairs, that begins from the driver name and a colon: mysql : host = localhost dbname = test port = 3306 charset = utf8mb4ĭriver ^ ^ colon ^ param = value pair ^ semicolon all other options go into options array.

#SPLICE CAST IRON PIPE WITH COMPRESSION COUPLING PASSWORD#

Unlike mysql and mysqli, both of which are low level bare APIs not intended to be used directly (but only as a building material for some higher level abstraction layer), PDO is such an abstraction already.

#SPLICE CAST IRON PIPE WITH COMPRESSION COUPLING CODE#

PDO abstracts not only a database API, but also basic operations that otherwise have to be repeated hundreds of times in every application, making your code extremely WET. However, it is not it is much, much more. Thus, for the average LAMP developer, this point is rather insignificant, and to him, PDO is just a more complicated version of familiar mysql(i)_query() function. And, despite some rumors, it is impossible to switch database backends by changing a single line in PDO config - due to different SQL flavors (to do so, one needs to use an averaged query language like DQL).

Although this feature is magnificent by itself, it doesn't make a big deal for the particular application, where only one database backend is used anyway. The abstraction, however, is two-fold: one is widely known but less significant, while another is obscure but of most importance.Įveryone knows that PDO offers unified interface to access many different databases. PDO is a Database Access Abstraction Layer. Following the mission of this site, this article will disprove various delusions and bad practices, while showing the right way instead.Īlthough this tutorial is based on mysql driver, the information, in general, is applicable for any driver supported. 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). 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 already exists in PDO. The only two exceptions are and, but they miss a lot of important information.

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.