Java generate setter query names

Question

I am building an entity and i need to populate all the fields from a result set from a jpql resultset like like so:

    summary.setPeriod_1((BigDecimal)object[4]);
    summary.setPeriod_2((BigDecimal)object[5]);
    summary.setPeriod_3((BigDecimal)object[6]);
    summary.setPeriod_4((BigDecimal)object[7]);

The problem is that there are 50x periods and it looks ugly and takes up lots of space.

is it possible to do it as a for loop something like this:

for(int i=1; i<54; i++){
summary.setPeriod_[i]((BigDecimal)object[i+4]);
}

Wouldn't you be better with an `addPeriod(int position, BigDecimal period)` method? — Software Engineer, Oct 29 '17 at 23:33
You have to loop using the reflexion and call the method by his name as a string https://stackoverflow.com/a/161005/4479402 — Djory Krache, Oct 29 '17 at 23:35

Djory Krache · Accepted Answer · 2017-10-30T08:11:16.070

1

You should try something a bit like this.

java.lang.reflect.Method method;
try {
  for(int i=1; i<54; i++){
       method = summary.getClass().getMethod("setPeriod_"+i, BigDecimal.class);
       method.invoke(summary, object[i]);
  }
} catch (SecurityException e) { ... }
  catch (NoSuchMethodException e) { ... }
  catch (IllegalArgumentException e) { ... }
  catch (IllegalAccessException e) { ... }
  catch (InvocationTargetException e) { ... }

edited Oct 30 '17 at 08:11

answered Oct 29 '17 at 23:28

Djory Krache

347
4
9

This is more of a comment than an answer. – Janez Kuhar Oct 29 '17 at 23:30
@Djory I keep getting an illegal argument error. What is "obj" supposed to be in your example? – Daryn Oct 30 '17 at 03:09
My bad, this is the instance of class that you need. in this case it was summary. – Djory Krache Oct 30 '17 at 08:13

Java generate setter query names

1 Answers1