Examples of com.db4o.query.Query.constrain()

com.db4o.query.Query.constrain()
adds a constraint to this node.

If the constraint contains attributes that are not yet present in the query graph, the query graph is extended accordingly.

Special behaviour for:
- class {@link Class}: confine the result to objects of one class or to objects implementing an interface.
- interface {@link Evaluation}: run evaluation callbacks against all candidates.
@param constraint the constraint to be added to this Query. @return {@link Constraint} a new {@link Constraint} for thisquery node or null for objects implementing the {@link Evaluation} interface.

    listResult(result);
  }


  public static void retrieveByDisjunction(ObjectContainer db) {
    Query query = db.query();
    query.constrain(Pilot.class);
    Constraint constr = query.descend("name").constrain("Michael Schumacher");
    query.descend("points").constrain(new Integer(99)).or(constr);
    ObjectSet result = query.execute();
    listResult(result);
  }

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    listResult(result);
  }


  public static void retrieveByComparison(ObjectContainer db) {
    Query query = db.query();
    query.constrain(Pilot.class);
    query.descend("points").constrain(new Integer(99)).greater();
    ObjectSet result = query.execute();
    listResult(result);
  }

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  public static void retrieveByDefaultFieldValue(ObjectContainer db) {
    Pilot somebody = new Pilot("Somebody else", 0);
    db.set(somebody);
    Query query = db.query();
    query.constrain(Pilot.class);
    query.descend("points").constrain(new Integer(0));
    ObjectSet result = query.execute();
    listResult(result);
    db.delete(somebody);
  }

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    db.delete(somebody);
  }


  public static void retrieveSorted(ObjectContainer db) {
    Query query = db.query();
    query.constrain(Pilot.class);
    query.descend("name").orderAscending();
    ObjectSet result = query.execute();
    listResult(result);
    query.descend("name").orderDescending();
    result = query.execute();

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    if(criteria.getCriteriaType().isQuery()) {
      if(nqt == null) throw new InvalidCriteriaException("No db4o named query translator specified.");
      nqt.translateNamedQuery(criteria.getNamedQueryDefinition(), criteria.getQueryParams(), query);
    }
    else {
      query.constrain(criteria.getEntityClass());
      final CriterionGroup pg = criteria.getPrimaryGroup();
      if(pg != null && pg.isSet()) {
        for(final ICriterion ic : pg) {
          if(ic.isGroup()) throw new InvalidCriteriaException("Nested criterion groups are not supported");
          if(!ic.isSet()) throw new InvalidCriteriaException("criterion not set");

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                // presume an object array
                final Object[] oarr = (Object[]) checkValue;
                min = oarr[0];
                max = oarr[1];
              }
              pquery.constrain(min).greater().equal().or(pquery.constrain(max).smaller().equal());
              break;
            }
            case CONTAINS:
              pquery.constrain(checkValue).contains();
              break;

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                // presume an object array
                final Object[] oarr = (Object[]) checkValue;
                min = oarr[0];
                max = oarr[1];
              }
              pquery.constrain(min).greater().equal().or(pquery.constrain(max).smaller().equal());
              break;
            }
            case CONTAINS:
              pquery.constrain(checkValue).contains();
              break;

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              }
              pquery.constrain(min).greater().equal().or(pquery.constrain(max).smaller().equal());
              break;
            }
            case CONTAINS:
              pquery.constrain(checkValue).contains();
              break;
            case ENDS_WITH:
              pquery.constrain(checkValue).endsWith(ctn.isCaseSensitive());
              break;
            case EQUALS:

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            }
            case CONTAINS:
              pquery.constrain(checkValue).contains();
              break;
            case ENDS_WITH:
              pquery.constrain(checkValue).endsWith(ctn.isCaseSensitive());
              break;
            case EQUALS:
              if(!ctn.isCaseSensitive())
                throw new InvalidCriteriaException("Case insensitive equals checking is currently not supported");
              pquery.constrain(checkValue);

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              pquery.constrain(checkValue).endsWith(ctn.isCaseSensitive());
              break;
            case EQUALS:
              if(!ctn.isCaseSensitive())
                throw new InvalidCriteriaException("Case insensitive equals checking is currently not supported");
              pquery.constrain(checkValue);
              break;
            case GREATER_THAN:
              pquery.constrain(checkValue).greater();
              break;
            case GREATER_THAN_EQUALS:

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