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Database abstraction layer

Allow the use of different database servers using the same code base.

Code

includes/database/mysql/database.inc, line 16

<?php
public function __construct(array $connection_options = array()) {
  // This driver defaults to non transaction support.
  $this->transactionSupport = !empty($connection_options['transactions']);

  // MySQL never supports transactional DDL.
  $this->transactionalDDLSupport = FALSE;

  // Default to TCP connection on port 3306.
  if (empty($connection_options['port'])) {
    $connection_options['port'] = 3306;
  }

  $dsn = 'mysql:host=' . $connection_options['host'] . ';port=' . $connection_options['port'] . ';dbname=' . $connection_options['database'];
  parent::__construct($dsn, $connection_options['username'], $connection_options['password'], array(
      // So we don't have to mess around with cursors and unbuffered queries by default.
      PDO::MYSQL_ATTR_USE_BUFFERED_QUERY => TRUE,
      // Because MySQL's prepared statements skip the query cache, because it's dumb.
      PDO::ATTR_EMULATE_PREPARES => TRUE,
      // Force column names to lower case.
      PDO::ATTR_CASE => PDO::CASE_LOWER,
    ));

  // Force MySQL to use the UTF-8 character set by default.
  $this->exec('SET NAMES "utf8"');

  // Force MySQL's behavior to conform more closely to SQL standards.
  // This allows Drupal to run almost seamlessly on many different
  // kinds of database systems. These settings force MySQL to behave
  // the same as postgresql, or sqlite in regards to syntax interpretation
  // and invalid data handling. See http://drupal.org/node/344575 for further disscussion.
  $this->exec("SET sql_mode='ANSI,TRADITIONAL'");
}
?>