Essential Books

PDO connecting to MySQLMariaDB server

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There are two ways to connect to a MySQL/MariaDB server, depending on your infrastructure.

Standard (TCP/IP) connection 

$dsn = 'mysql:dbname=demo;host=server;port=3306;charset=utf8';
$connection = new \PDO($dsn, $username, $password);

// throw exceptions, when SQL error is caused
$connection->setAttribute(\PDO::ATTR_ERRMODE, \PDO::ERRMODE_EXCEPTION);
// prevent emulation of prepared statements
$connection->setAttribute(\PDO::ATTR_EMULATE_PREPARES, false);

Since PDO was designed to be compatible with older MySQL server versions (which did not have support for prepared statements), you have to explicitly disable the emulation. Otherwise, you will lose the added injection prevention benefits, that are usually granted by using prepared statements.

Another design compromise, that you have to keep in mind, is the default error handling behavior. If not otherwise configured, PDO will not show any indications of SQL errors.

It is strongly recommended setting it to “exception mode”, because that gains you additional functionality, when writing persistence abstractions (for example: having an exception, when violating UNIQUE constraint).

Socket connection 

$dsn = 'mysql:unix_socket=/tmp/mysql.sock;dbname=demo;charset=utf8';
$connection = new \PDO($dsn, $username, $password);

// throw exceptions, when SQL error is caused
$connection->setAttribute(\PDO::ATTR_ERRMODE, \PDO::ERRMODE_EXCEPTION);
// prevent emulation of prepared statements
$connection->setAttribute(\PDO::ATTR_EMULATE_PREPARES, false);

On unix-like systems, if host name is 'localhost', then the connection to the server is made through a domain socket.

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PDO:
* PDO
* Preventing SQL injection with Parameterized Queries
* Basic PDO Connection and Retrieval
* Database Transactions with PDO
* PDO connecting to MySQLMariaDB server
* PDO Get number of affected rows by a query
* PDO lastInsertId
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0 Getting started
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3 Functional programming
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39 Contributing to PHP Manual
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46 Type juggling and non-strict comparison issues
47 Security
48 PHP MySQLi
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57 Installing PHP on Windows
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62 Installing on Linux / Unix
63 Contributing to PHP Core
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65 Using MongoDB
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80 Cryptography
81 PDO
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87 MongoDB
88 Manipulating an array
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92 Comments
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100 Docker deployment
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103 Design patterns
104 Secure remember me
105 PHP mysqli
106 PHP built-in server
107 How to break down an URL
108 PSR
109 Contributors