+/**
+ * Base interface for all DBMS-specific code. At a bare minimum, all of the
+ * following must be implemented to support MediaWiki
+ *
+ * @file
+ * @ingroup Database
+ */
+interface DatabaseType {
+ /**
+ * Get the type of the DBMS, as it appears in $wgDBtype.
+ *
+ * @return string
+ */
+ public function getType();
+
+ /**
+ * Open a connection to the database. Usually aborts on failure
+ *
+ * @param $server String: database server host
+ * @param $user String: database user name
+ * @param $password String: database user password
+ * @param $dbName String: database name
+ * @return bool
+ * @throws DBConnectionError
+ */
+ public function open( $server, $user, $password, $dbName );
+
+ /**
+ * The DBMS-dependent part of query()
+ * @todo Fixme: Make this private someday
+ *
+ * @param $sql String: SQL query.
+ * @return Result object to feed to fetchObject, fetchRow, ...; or false on failure
+ * @private
+ */
+ /*private*/ function doQuery( $sql );
+
+ /**
+ * Fetch the next row from the given result object, in object form.
+ * Fields can be retrieved with $row->fieldname, with fields acting like
+ * member variables.
+ *
+ * @param $res SQL result object as returned from DatabaseBase::query(), etc.
+ * @return Row object
+ * @throws DBUnexpectedError Thrown if the database returns an error
+ */
+ public function fetchObject( $res );
+
+ /**
+ * Fetch the next row from the given result object, in associative array
+ * form. Fields are retrieved with $row['fieldname'].
+ *
+ * @param $res SQL result object as returned from DatabaseBase::query(), etc.
+ * @return Row object
+ * @throws DBUnexpectedError Thrown if the database returns an error
+ */
+ public function fetchRow( $res );
+
+ /**
+ * Get the number of rows in a result object
+ *
+ * @param $res Mixed: A SQL result
+ * @return int
+ */
+ public function numRows( $res );
+
+ /**
+ * Get the number of fields in a result object
+ * @see http://www.php.net/mysql_num_fields
+ *
+ * @param $res Mixed: A SQL result
+ * @return int
+ */
+ public function numFields( $res );
+
+ /**
+ * Get a field name in a result object
+ * @see http://www.php.net/mysql_field_name
+ *
+ * @param $res Mixed: A SQL result
+ * @param $n Integer
+ * @return string
+ */
+ public function fieldName( $res, $n );
+
+ /**
+ * Get the inserted value of an auto-increment row
+ *
+ * The value inserted should be fetched from nextSequenceValue()
+ *
+ * Example:
+ * $id = $dbw->nextSequenceValue('page_page_id_seq');
+ * $dbw->insert('page',array('page_id' => $id));
+ * $id = $dbw->insertId();
+ *
+ * @return int
+ */
+ public function insertId();
+
+ /**
+ * Change the position of the cursor in a result object
+ * @see http://www.php.net/mysql_data_seek
+ *
+ * @param $res Mixed: A SQL result
+ * @param $row Mixed: Either MySQL row or ResultWrapper
+ */
+ public function dataSeek( $res, $row );
+
+ /**
+ * Get the last error number
+ * @see http://www.php.net/mysql_errno
+ *
+ * @return int
+ */
+ public function lastErrno();
+
+ /**
+ * Get a description of the last error
+ * @see http://www.php.net/mysql_error
+ *
+ * @return string
+ */
+ public function lastError();
+
+ /**
+ * mysql_fetch_field() wrapper
+ * Returns false if the field doesn't exist
+ *
+ * @param $table string: table name
+ * @param $field string: field name
+ */
+ public function fieldInfo( $table, $field );
+
+ /**
+ * Get information about an index into an object
+ * @param $table string: Table name
+ * @param $index string: Index name
+ * @param $fname string: Calling function name
+ * @return Mixed: Database-specific index description class or false if the index does not exist
+ */
+ function indexInfo( $table, $index, $fname = 'Database::indexInfo' );
+
+ /**
+ * Get the number of rows affected by the last write query
+ * @see http://www.php.net/mysql_affected_rows
+ *
+ * @return int
+ */
+ public function affectedRows();
+
+ /**
+ * Wrapper for addslashes()
+ *
+ * @param $s string: to be slashed.
+ * @return string: slashed string.
+ */
+ public function strencode( $s );
+
+ /**
+ * Returns a wikitext link to the DB's website, e.g.,
+ * return "[http://www.mysql.com/ MySQL]";
+ * Should at least contain plain text, if for some reason
+ * your database has no website.
+ *
+ * @return string: wikitext of a link to the server software's web site
+ */
+ public static function getSoftwareLink();
+
+ /**
+ * A string describing the current software version, like from
+ * mysql_get_server_info().
+ *
+ * @return string: Version information from the database server.
+ */
+ public function getServerVersion();
+
+ /**
+ * A string describing the current software version, and possibly
+ * other details in a user-friendly way. Will be listed on Special:Version, etc.
+ * Use getServerVersion() to get machine-friendly information.
+ *
+ * @return string: Version information from the database server
+ */
+ public function getServerInfo();
+}
+