public function stmt_fragment($part, $args=[]) {
		$type = $this->dbtype;
		if ($part == 'engine') {
			if ($type == 'mysql')
				# we only intent to support FOREIGN KEY-capable engines
				return "ENGINE=InnoDB";
			return '';
		}
		if ($part == "index") {
			if ($type == 'pgsql')
				return 'SERIAL PRIMARY KEY';
			if ($type == 'mysql')
				return 'INTEGER PRIMARY KEY AUTO_INCREMENT';
			return 'INTEGER PRIMARY KEY AUTOINCREMENT';
		}
		if ($part == 'datetime') {
			$delta = 0;
			if ($args && isset($args['delta']))
				$delta = (int)$args['delta'];
			return $this->stmt_fragment_datetime($delta);
		}
		return "";
	}
public function stmt_fragment($part, $args=[]) {
		$type = $this->dbtype;
		if ($part == 'engine') {
			if ($type == 'mysql')
				# we only intent to support FOREIGN KEY-capable engines
				return "ENGINE=InnoDB";
			return '';
		}
		if ($part == "index") {
			if ($type == 'pgsql')
				return 'SERIAL PRIMARY KEY';
			if ($type == 'mysql')
				return 'INTEGER PRIMARY KEY AUTO_INCREMENT';
			return 'INTEGER PRIMARY KEY AUTOINCREMENT';
		}
		if ($part == 'datetime') {
			$delta = 0;
			if ($args && isset($args['delta']))
				$delta = (int)$args['delta'];
			return $this->stmt_fragment_datetime($delta);
		}
		return "";
	}
public function stmt_fragment ( $ part , $ args = [ ] ) { $ type = $ this -> dbtype ; if ( $ part == 'engine' ) { if ( $ type == 'mysql' ) # we only intent to support FOREIGN KEY-capable engines return "ENGINE=InnoDB" ; return '' ; } if ( $ part == "index" ) { if ( $ type == 'pgsql' ) return 'SERIAL PRIMARY KEY' ; if ( $ type == 'mysql' ) return 'INTEGER PRIMARY KEY AUTO_INCREMENT' ; return 'INTEGER PRIMARY KEY AUTOINCREMENT' ; } if ( $ part == 'datetime' ) { $ delta = 0 ; if ( $ args && isset ( $ args [ 'delta' ] ) ) $ delta = ( int ) $ args [ 'delta' ] ; return $ this -> stmt_fragment_datetime ( $ delta ) ; } return "" ; }
SQL statement fragment.

@param string $part A part sensitive to the database being used,
one of these: 'engine', 'index', 'datetime'.
@param array $args Dict of parameters for $part, for 'datetime'
only.
SQL statement fragment .