@Override
        public String toString() {
            return new StringJoiner(", ", BoundFieldMapper.class.getSimpleName() + "[", "]")
                .add("type=" + type.getSimpleName())
                .add("prefix=" + prefix)
                .toString();
        }
Returns a mapper for the given bean class

@param <T> the type to map
@param type the mapped class
@param prefix the column name prefix for each mapped field
@return a mapper for the given bean class
core/src/main/java/org/jdbi/v3/core/mapper/reflect/FieldMapper.java