@Override
    public Long toDatabaseType(Integer value) {
        return value == null ? null : ((long) (int) value);
    }
Maps between {@code Long} and {@code Integer} values by simply casting to
lower precision.

@author Emil Forslund
@since  3.0.2
runtime-parent/runtime-typemapper/src/main/java/com/speedment/runtime/typemapper/longs/LongToIntegerMapper.java