Package com.google.appengine.api.datastore

Examples of com.google.appengine.api.datastore.PreparedQuery

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    SimpleMessage msg = (SimpleMessage) message;
    String kind =  msg.getMessage();
    DatastoreService datastore = getBusiness().getSystemService()
              .getDatastore();
        Query query = new Query(kind);
        PreparedQuery results = datastore.prepare(query);
        int i = 0;
        boolean end = true;
        for (Entity entity : results.asIterable()) {
          datastore.delete(entity.getKey());
          i++;
        if (getBusiness().getSystemService()
            .getRequestCPUTimeSeconds() > 25) {
          addEntityRemoveTask(kind);
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          DatastoreService datastore = getBusiness().getSystemService()
              .getDatastore();
          Query query = new Query("_ah_SESSION");
          query.addFilter("_expires", FilterOperator.LESS_THAN,
              System.currentTimeMillis());
          PreparedQuery results = datastore.prepare(query);
          int i = 0;
          boolean end = true;
          for (Entity session : results.asIterable()) {
            datastore.delete(session.getKey());
            i++;
          if (getBusiness().getSystemService()
              .getRequestCPUTimeSeconds() > 25) {
            addSessionCleanTask();
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  }

  protected void removeSelected(Query q) {
    getQueryCache().removeQueries(clazz);
    getDao().getDaoStat().incQueryCalls();
    PreparedQuery p = getDatastore().prepare(q);
    List<Key> keys = new ArrayList<Key>();
    int count = 0;
    for (Entity entity : p.asIterable(FetchOptions.Builder.withChunkSize(CHUNK_SIZE))) {
      keys.add(entity.getKey());
      // GAE Datastore one call delete limit
      if (count++ >= 499) {
        getDatastore().delete(keys);
        keys.clear();
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    return result;
  }

  protected List<T> selectNotCache(Query query) {
    getDao().getDaoStat().incQueryCalls();
    PreparedQuery p = getDatastore().prepare(query);
    List<Entity> entities = new ArrayList<Entity>();
    for (Entity entity : p.asIterable(FetchOptions.Builder.withChunkSize(CHUNK_SIZE))) {
      entities.add(entity);
    }
    return createModels(entities);
  }
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  }
 
  protected int count(Query query) {
    getDao().getDaoStat().incQueryCalls();
    query.setKeysOnly();
    PreparedQuery p = getDatastore().prepare(query);
    int count = 0;
    for (Entity entity : p.asIterable(FetchOptions.Builder.withChunkSize(CHUNK_SIZE))) count++;
    return count;
  }
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                Query q = new Query(AC_BASE);
                q.setKeysOnly();

                q.addFilter(PROPERTY_EXPIRES,
                        FilterOperator.LESS_THAN_OR_EQUAL, expire);
                PreparedQuery pq = ds.prepare(q);
                List<Entity> entities = pq.asList(Builder
                        .withLimit(CLEANUP_LIMIT));
                if (entities != null) {
                    getLogger()
                            .log(Level.INFO,
                                    "Vaadin cleanup deleting {0} expired Vaadin sessions.",
                                    entities.size());
                    List<Key> keys = new ArrayList<Key>();
                    for (Entity e : entities) {
                        keys.add(e.getKey());
                    }
                    ds.delete(keys);
                }
            }
            // Also cleanup GAE sessions
            {
                Query q = new Query(APPENGINE_SESSION_KIND);
                q.setKeysOnly();
                q.addFilter(PROPERTY_APPENGINE_EXPIRES,
                        FilterOperator.LESS_THAN_OR_EQUAL, expire);
                PreparedQuery pq = ds.prepare(q);
                List<Entity> entities = pq.asList(Builder
                        .withLimit(CLEANUP_LIMIT));
                if (entities != null) {
                    getLogger()
                            .log(Level.INFO,
                                    "Vaadin cleanup deleting {0} expired appengine sessions.",
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      if(!gaeCtx.isActive()){
        // cursor not yet created
        switch(fetchType.fetchType){
        case KEYS_ONLY:
          {
            PreparedQuery pq = prepareKeysOnly(query);
            if(!gaeCtx.useCursor){
              // then uses offset (in case of IN or != operators)
              //if(offset.isActive()){
              //  fetchOptions.offset(offset.offset);
              //}
              fetchOptions.offset(gaeCtx.realOffset);             
            }
           
            // we can't use real asynchronous function with cursors
            // so the page is extracted at once and wrapped into a SienaFuture
            QueryResultList<Entity> entities = pq.asQueryResultList(fetchOptions);

            // activates the GaeCtx now that it is initialised
            gaeCtx.activate();
            // sets the current cursor (in stateful mode, cursor is always kept for further use)
            if(pag.isPaginating()){
              Cursor cursor = entities.getCursor();
              if(cursor!=null){
                gaeCtx.addCursor(cursor.toWebSafeString());
              }
            }else{
              Cursor cursor = entities.getCursor();
              if(cursor!=null){
                gaeCtx.addAndMoveCursor(entities.getCursor().toWebSafeString());
              }
              // keeps track of the offset anyway if not paginating
              gaeCtx.realOffset+=entities.size();
            }                     
           
            return new GaeSienaFutureListMapper<T>(
                this, entities, query, GaeSienaFutureListMapper.MapType.KEYS_ONLY);
          }
        case NORMAL:
        default:
          {
            PreparedQuery pq = prepare(query);
            if(!gaeCtx.useCursor){
              // then uses offset (in case of IN or != operators)
              //if(offset.isActive()){
              //  fetchOptions.offset(offset.offset);
              //}
              fetchOptions.offset(gaeCtx.realOffset);             
            }
            // we can't use real asynchronous function with cursors
            // so the page is extracted at once and wrapped into a SienaFuture
            QueryResultList<Entity> entities = pq.asQueryResultList(fetchOptions);
           
            // activates the GaeCtx now that it is initialised
            gaeCtx.activate();
            // sets the current cursor (in stateful mode, cursor is always kept for further use)
            //if(gaeCtx.useCursor){
            if(pag.isPaginating()){
              Cursor cursor = entities.getCursor();
              if(cursor!=null){
                gaeCtx.addCursor(cursor.toWebSafeString());
              }
            }else{
              Cursor cursor = entities.getCursor();
              if(cursor!=null){
                gaeCtx.addAndMoveCursor(entities.getCursor().toWebSafeString());
              }
              // keeps track of the offset anyway if not paginating
              gaeCtx.realOffset+=entities.size();
            }
            //}
           
            return new GaeSienaFutureListMapper<T>(this, entities, query);
          }
        }
       
      }else {
        switch(fetchType.fetchType){
        case KEYS_ONLY:
          {
            // we prepare the query each time
            PreparedQuery pq = prepareKeysOnly(query);
            QueryResultList<Entity> entities;
            if(!gaeCtx.useCursor){
              // then uses offset (in case of IN or != operators)
              //if(offset.isActive()){
              //  fetchOptions.offset(offset.offset);
              //}
              fetchOptions.offset(gaeCtx.realOffset);
              // we can't use real asynchronous function with cursors
              // so the page is extracted at once and wrapped into a SienaFuture
              entities = pq.asQueryResultList(fetchOptions);
            }else {
              // we can't use real asynchronous function with cursors
              // so the page is extracted at once and wrapped into a SienaFuture
              String cursor = gaeCtx.currentCursor();
              if(cursor!=null){
                entities = pq.asQueryResultList(
                  fetchOptions.startCursor(Cursor.fromWebSafeString(cursor)));
              }
              else {
                entities = pq.asQueryResultList(fetchOptions);
              }
            }
           
            // sets the current cursor (in stateful mode, cursor is always kept for further use)
            //if(gaeCtx.useCursor){
            if(pag.isPaginating()){
              Cursor cursor = entities.getCursor();
              if(cursor!=null){
                gaeCtx.addCursor(cursor.toWebSafeString());
              }
            }else{
              Cursor cursor = entities.getCursor();
              if(cursor!=null){
                gaeCtx.addAndMoveCursor(entities.getCursor().toWebSafeString());
              }
              // keeps track of the offset anyway if not paginating
              gaeCtx.realOffset+=entities.size();
            }
            //}
           
            return new GaeSienaFutureListMapper<T>(
                this, entities, query, GaeSienaFutureListMapper.MapType.KEYS_ONLY);
          }
        case NORMAL:
        default:
          {
            PreparedQuery pq = prepare(query);
            QueryResultList<Entity> entities;
            if(!gaeCtx.useCursor){
              // then uses offset (in case of IN or != operators)
              //if(offset.isActive()){
              //  fetchOptions.offset(offset.offset);
              //}
              fetchOptions.offset(gaeCtx.realOffset);
              // we can't use real asynchronous function with cursors
              // so the page is extracted at once and wrapped into a SienaFuture
              entities = pq.asQueryResultList(fetchOptions);
            }else {
              // we can't use real asynchronous function with cursors
              // so the page is extracted at once and wrapped into a SienaFuture
              String cursor = gaeCtx.currentCursor();
              if(cursor!=null){
                entities = pq.asQueryResultList(
                  fetchOptions.startCursor(Cursor.fromWebSafeString(gaeCtx.currentCursor())));
              }else {
                entities = pq.asQueryResultList(fetchOptions);
              }
            }
           
            // sets the current cursor (in stateful mode, cursor is always kept for further use)
            //if(gaeCtx.useCursor){
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        // cursor not yet created
        switch(fetchType.fetchType){
        case ITER:
        default:
          {
            PreparedQuery pq = prepare(query);
           
            if(pag.isPaginating()){
              // in case of pagination, we need to allow asynchronous calls such as:
              // QueryAsync<MyClass> query = pm.createQuery(MyClass).paginate(5).stateful().order("name");
              // SienaFuture<Iterable<MyClass>> future1 = query.iter();
              // SienaFuture<Iterable<MyClass>> future2 = query.nextPage().iter();
              // Iterable<MyClass> it = future1.get().iterator();
              // while(it.hasNext()) { // do it }
              // it = future2.get().iterator();
              // while(it.hasNext()) { // do it }
             
              // so we can't use the asQueryResultIterable as the cursor is not moved to the end of the current page
              // but moved at each call of iterable.iterator().next()
              // thus we use the List in this case to be able to move directly to the next page with cursors
              QueryResultList<Entity> entities = pq.asQueryResultList(fetchOptions);

              // activates the GaeCtx now that it is initialised
              gaeCtx.activate();
              // sets the current cursor (in stateful mode, cursor is always kept for further use)
              //if(gaeCtx.useCursor){
              Cursor cursor = entities.getCursor();
              if(cursor!=null){
                gaeCtx.addCursor(cursor.toWebSafeString());
              }
              //}
             
              return new GaeSienaFutureIterableMapper<T>(this, entities, query);
            }else {
              // if not paginating, we simply use the queryresultiterable and moves the current cursor
              // while iterating
              QueryResultIterable<Entity> entities = pq.asQueryResultIterable(fetchOptions);
              // activates the GaeCtx now that it is initialised
              gaeCtx.activate();
              return new GaeSienaFutureIterableMapperWithCursor<T>(this, entities, query);
            }
           
          }
        }
       
      }else {
        switch(fetchType.fetchType){
        case ITER:
        default:
          {
            PreparedQuery pq = prepare(query);
            if(pag.isPaginating()){
              // in case of pagination, we need to allow asynchronous calls such as:
              // QueryAsync<MyClass> query = pm.createQuery(MyClass).paginate(5).stateful().order("name");
              // SienaFuture<Iterable<MyClass>> future1 = query.iter();
              // SienaFuture<Iterable<MyClass>> future2 = query.nextPage().iter();
              // Iterable<MyClass> it = future1.get().iterator();
              // while(it.hasNext()) { // do it }
              // it = future2.get().iterator();
              // while(it.hasNext()) { // do it }
             
              // so we can't use the asQueryResultIterable as the cursor is not moved to the end of the current page
              // but moved at each call of iterable.iterator().next()
              // thus we use the List in this case to be able to move directly to the next page with cursors
              QueryResultList<Entity> entities;
              if(!gaeCtx.useCursor){
                // then uses offset (in case of IN or != operators)
                //if(offset.isActive()){
                //  fetchOptions.offset(offset.offset);
                //}
                fetchOptions.offset(gaeCtx.realOffset);
                entities = pq.asQueryResultList(fetchOptions);
              }else {
                String cursor = gaeCtx.currentCursor();
                if(cursor!=null){
                  entities = pq.asQueryResultList(
                    fetchOptions.startCursor(Cursor.fromWebSafeString(cursor)));
                }else {
                  entities = pq.asQueryResultList(fetchOptions);
                }
               
                // sets the current cursor (in stateful mode, cursor is always kept for further use)
                //if(gaeCtx.useCursor){
                gaeCtx.addCursor(entities.getCursor().toWebSafeString());
                //}
              }
              return new GaeSienaFutureIterableMapper<T>(this, entities, query);
            }else {
              // if not paginating, we simply use the queryresultiterable and moves the current cursor
              // while iterating
              QueryResultIterable<Entity> entities;
              if(!gaeCtx.useCursor){
                // then uses offset (in case of IN or != operators)
                //if(offset.isActive()){
                //  fetchOptions.offset(offset.offset);
                //}
                fetchOptions.offset(gaeCtx.realOffset);               
                entities = pq.asQueryResultIterable(fetchOptions);
              }else {
                String cursor = gaeCtx.currentCursor();
                if(cursor!=null){
                  entities = pq.asQueryResultIterable(
                    fetchOptions.startCursor(Cursor.fromWebSafeString(gaeCtx.currentCursor())));
                }else {
                  entities = pq.asQueryResultIterable(fetchOptions); 
                }
              }
              return new GaeSienaFutureIterableMapperWithCursor<T>(this, entities, query);
            }
          }
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      if(ClassInfo.isModel(cClazz)){
        // creates a query for fieldname:child_tablename
        com.google.appengine.api.datastore.Query q =
          new com.google.appengine.api.datastore.Query(GaeMappingUtils.getKindWithAncestorField(cInfo, info, f));

        PreparedQuery pq = ds.prepare(q.setAncestor(ancestorKey));
        Entity cEntity = pq.asSingleEntity();
        Object cObj = Util.createObjectInstance(cClazz);
        GaeMappingUtils.fillModelAndKey(cObj, cEntity);
        Util.setField(ancestor, f, cObj);
      }
      // todo manage joined one2many listquery
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      if(!gaeCtx.isActive()){
        // cursor not yet created
        switch(fetchType.fetchType){
        case KEYS_ONLY:
          {
            PreparedQuery pq = prepareKeysOnly(query);
            if(!gaeCtx.useCursor){
              // then uses offset (in case of IN or != operators)
              //if(offset.isActive()){
              //  fetchOptions.offset(gaeCtx.realOffset);
              //}           
              fetchOptions.offset(gaeCtx.realOffset);
            }
           
            // we can't use real asynchronous function with cursors
            // so the page is extracted at once and wrapped into a SienaFuture
            QueryResultList<Entity> entities = pq.asQueryResultList(fetchOptions);

            // activates the GaeCtx now that it is initialised
            gaeCtx.activate();
            // sets the current cursor (in stateful mode, cursor is always kept for further use)
            if(pag.isPaginating()){
              Cursor cursor = entities.getCursor();
              if(cursor!=null){
                gaeCtx.addCursor(cursor.toWebSafeString());
              }
             
              // if paginating and 0 results then no more data else resets noMoreDataAfter
              if(entities.size()==0){
                gaeCtx.noMoreDataAfter = true;
              } else {
                gaeCtx.noMoreDataAfter = false;
              }
            }else{
              Cursor cursor = entities.getCursor();
              if(cursor!=null){
                gaeCtx.addAndMoveCursor(entities.getCursor().toWebSafeString());
              }
              // keeps track of the offset anyway if not paginating
              gaeCtx.realOffset+=entities.size();
            }                     
           
            return mapKeysOnly(query, entities);
          }
        case NORMAL:
        default:
          {
            PreparedQuery pq = prepare(query);
            if(!gaeCtx.useCursor){
              // then uses offset (in case of IN or != operators)
              //if(offset.isActive()){
              //  fetchOptions.offset(gaeCtx.realOffset);
              //}
              fetchOptions.offset(gaeCtx.realOffset);
            }
            // we can't use real asynchronous function with cursors
            // so the page is extracted at once and wrapped into a SienaFuture
            QueryResultList<Entity> entities = pq.asQueryResultList(fetchOptions);
           
            // activates the GaeCtx now that it is initialised
            gaeCtx.activate();
            // sets the current cursor (in stateful mode, cursor is always kept for further use)
            if(pag.isPaginating()){
              Cursor cursor = entities.getCursor();
              if(cursor!=null){
                gaeCtx.addCursor(cursor.toWebSafeString());
              }
              // if paginating and 0 results then no more data else resets noMoreDataAfter
              if(entities.size()==0){
                gaeCtx.noMoreDataAfter = true;
              } else {
                gaeCtx.noMoreDataAfter = false;
              }
            }else{
              Cursor cursor = entities.getCursor();
              if(cursor!=null){
                gaeCtx.addAndMoveCursor(entities.getCursor().toWebSafeString());
              }
              // keeps track of the offset anyway if not paginating
              gaeCtx.realOffset+=entities.size();
            }
           
            return map(query, entities);
          }
        }
       
      }else {
        switch(fetchType.fetchType){
        case KEYS_ONLY:
          {
            // we prepare the query each time
            PreparedQuery pq = prepareKeysOnly(query);
            QueryResultList<Entity> entities;
            if(!gaeCtx.useCursor){
              // then uses offset (in case of IN or != operators)
              //if(offset.isActive()){
              //  fetchOptions.offset(gaeCtx.realOffset);
              //}
              fetchOptions.offset(gaeCtx.realOffset);
              // we can't use real asynchronous function with cursors
              // so the page is extracted at once and wrapped into a SienaFuture
              entities = pq.asQueryResultList(fetchOptions);
            }else {
              // we can't use real asynchronous function with cursors
              // so the page is extracted at once and wrapped into a SienaFuture
              String cursor = gaeCtx.currentCursor();
              if(cursor!=null){
                entities = pq.asQueryResultList(
                  fetchOptions.startCursor(Cursor.fromWebSafeString(cursor)));
              }
              else {
                entities = pq.asQueryResultList(fetchOptions);
              }
            }
           
            // sets the current cursor (in stateful mode, cursor is always kept for further use)
            if(pag.isPaginating()){
              Cursor cursor = entities.getCursor();
              if(cursor!=null){
                gaeCtx.addCursor(cursor.toWebSafeString());
              }
              // if paginating and 0 results then no more data else resets noMoreDataAfter
              if(entities.size()==0){
                gaeCtx.noMoreDataAfter = true;
              } else {
                gaeCtx.noMoreDataAfter = false;
              }
            }else{
              Cursor cursor = entities.getCursor();
              if(cursor!=null){
                gaeCtx.addAndMoveCursor(entities.getCursor().toWebSafeString());
              }
              // keeps track of the offset anyway if not paginating
              gaeCtx.realOffset+=entities.size();
            }
            //}
           
            return mapKeysOnly(query, entities);
          }
        case NORMAL:
        default:
          {
            PreparedQuery pq = prepare(query);
            QueryResultList<Entity> entities;
            if(!gaeCtx.useCursor){
              // then uses offset (in case of IN or != operators)
              //if(offset.isActive()){
              //  fetchOptions.offset(gaeCtx.realOffset);
              //}
             
              fetchOptions.offset(gaeCtx.realOffset);
              // we can't use real asynchronous function with cursors
              // so the page is extracted at once and wrapped into a SienaFuture
              entities = pq.asQueryResultList(fetchOptions);
            }else {
              // we can't use real asynchronous function with cursors
              // so the page is extracted at once and wrapped into a SienaFuture
              String cursor = gaeCtx.currentCursor();
              if(cursor!=null){
                entities = pq.asQueryResultList(
                  fetchOptions.startCursor(Cursor.fromWebSafeString(gaeCtx.currentCursor())));
              }else {
                entities = pq.asQueryResultList(fetchOptions);
              }
            }
           
            // sets the current cursor (in stateful mode, cursor is always kept for further use)
            if(pag.isPaginating()){
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