             case german = "German"
         }
         
+        /// The order of the date fields.
         public enum Order: String {
             case dmy = "DMY"
             case mdy = "MDY"

                self = order
            }
        }
    }
    
    public enum Encoding: String {
        static let unknownSQLASCIIName = "SQL_ASCII"
        

        }
    }
    
    /// Returns a quoted form of the string which can be concatenated with a 
    /// SQL statement to add a string literal.
    ///
    /// - Parameter string: The string to quote, or `nil` if a `NULL` should be 
    ///               added.
    /// - Returns: A string that can be concatenated into a SQL string.
    /// 
    /// - Note: While it's usually better to use `PGConn.execute(_:with:returningIn:)`  
    ///          to pass data without concatenating it into a SQL string, occasionally  
    ///          PostgreSQL will not allow a placeholder at a particular location. 
    ///          This method can help you in such a situation.
    /// 
    /// - RecommendedOver: `PQescapeLiteral`
    public func quotedLiteral(_ string: String?) -> String {
        guard let string = string else {
