Allow the use of different database servers using the same code base. Overview Drupal's database abstraction

public Schema::changeField($table, $field, $field_new, $spec, $keys_new

protected Connection::doEscape($string)

public &SelectExtender::getUnion()

public Tasks::validateDatabaseSettings($database)

A boolean value to indicate whether this transaction has been rolled back. Type: bool File

Exception thrown if an undefined database connection is requested. Hierarchy class

public Connection::upsert($table, array $options = array())

General class for an abstracted "Upsert" (UPDATE or INSERT) query operation. This class can only be used with a table with a single unique index

public Log::end($logging_key) Stop logging for the