Examples of com.db4o.query.Constraint

com.db4o.query.Constraint
constraint to limit the objects returned upon {@link Query#execute() query execution}.

Constraints are constructed by calling {@link Query#constrain(Object)}.

Constraints can be joined with the methods {@link #and}and {@link #or}.

The methods to modify the constraint evaluation algorithm may be merged, to construct combined evaluation rules. Examples:
- Constraint#smaller().equal() for "smaller or equal"
- Constraint#not().like() for "not like"
- Constraint#not().greater().equal() for "not greater or equal"

      Query query = fDb.query();
      query.constrain(News.class);
      query.descend("fFeedLink").constrain(feedRef.getLink().toString()); //$NON-NLS-1$
      query.descend("fParentId").constrain(0); //$NON-NLS-1$
      if (!states.containsAll(EnumSet.allOf(INews.State.class))) {
        Constraint constraint = null;
        for (INews.State state : states) {
          if (constraint == null)
            constraint = query.descend("fStateOrdinal").constrain(state.ordinal()); //$NON-NLS-1$
          else
            constraint = query.descend("fStateOrdinal").constrain(state.ordinal()).or(constraint); //$NON-NLS-1$

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    try {
      Query query = fDb.query();
      query.constrain(News.class);
      if (!originalStates.containsAll(EnumSet.allOf(INews.State.class))) {
        Constraint constraint = null;
        for (INews.State originalState : originalStates) {
          if (constraint == null)
            constraint = query.descend("fStateOrdinal").constrain(originalState.ordinal()); //$NON-NLS-1$
          else
            constraint = query.descend("fStateOrdinal").constrain(originalState.ordinal()).or(constraint); //$NON-NLS-1$

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    try {
      Query query = fDb.query();
      query.constrain(News.class);
      query.descend("fFeedLink").constrain(feedRef.getLink().toString());
      if (!states.containsAll(EnumSet.allOf(INews.State.class))) {
        Constraint constraint = null;
        for (INews.State state : states) {
          if (constraint == null)
            constraint = query.descend("fStateOrdinal").constrain(state.ordinal());
          else
            constraint = query.descend("fStateOrdinal").constrain(state.ordinal()).or(constraint);

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  }


  public static void retrieveByConjunction(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)).and(constr);
    ObjectSet result = query.execute();
    listResult(result);
  }

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  }


  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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              else {
                throw new InvalidCriteriaException(
                    "Unsupported or null type for IN comparator: " + checkValue == null ? "<null>" : checkValue
                        .getClass().toString());
              }
              Constraint c = null;
              for(final Object o : arr) {
                if(c == null) {
                  c = pquery.constrain(o);
                }
                else {
                  c.or(pquery.constrain(o));
                }
              }
              break;
            }
            case IS:

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            else {
              throw new InvalidCriteriaException(
                  "Unsupported or null type for IN comparator: " + checkValue == null ? "<null>" : checkValue
                      .getClass().toString());
            }
            Constraint c = null;
            for(final Object o : arr) {
              if(c == null) {
                c = pquery.constrain(o);
              }
              else {
                c.or(pquery.constrain(o));
              }
            }
            break;
          }
          case IS:

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  public ObjectSet<IRequestLogRecord> executeFilterQuery(ObjectContainer db) {
    activate(ActivationPurpose.READ);
    final Query query = db.query();
    query.constrain(IRequestLogRecord.class);
    
    Constraint orChain = null;
    Constraint andChain = null;
    
    for(IHttpCondition c: getAllConditionsList()) {
      Constraint result = ((AbstractCondition)c).filterRequestLogQuery(query);
      if(c.isSufficient()) {
        orChain = processConstraintChain(result, orChain, false);
      } else {
        andChain = processConstraintChain(result, andChain, true);
      }

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      Query query = fDb.query();
      query.constrain(News.class);
      query.descend("fFeedLink").constrain(feedRef.getLink().toString()); //$NON-NLS-1$
      query.descend("fParentId").constrain(0); //$NON-NLS-1$
      if (!states.containsAll(EnumSet.allOf(INews.State.class))) {
        Constraint constraint = null;
        for (INews.State state : states) {
          if (constraint == null)
            constraint = query.descend("fStateOrdinal").constrain(state.ordinal()); //$NON-NLS-1$
          else
            constraint = query.descend("fStateOrdinal").constrain(state.ordinal()).or(constraint); //$NON-NLS-1$

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    try {
      Query query = fDb.query();
      query.constrain(News.class);
      if (!originalStates.containsAll(EnumSet.allOf(INews.State.class))) {
        Constraint constraint = null;
        for (INews.State originalState : originalStates) {
          if (constraint == null)
            constraint = query.descend("fStateOrdinal").constrain(originalState.ordinal()); //$NON-NLS-1$
          else
            constraint = query.descend("fStateOrdinal").constrain(originalState.ordinal()).or(constraint); //$NON-NLS-1$

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Related Classes of com.db4o.query.Constraint

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com.tll.dao.db4o.Db4oEntityDao

org.rssowl.core.internal.persist.dao.NewsDAOImpl

org.springmodules.db4o.examples.chapter1.QueryExample

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