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

Package com.google.appengine.api.datastore

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

com.google.appengine.api.datastore.DatastoreService
The {@code DatastoreService} provides synchronous access to a schema-lessdata storage system. The fundamental unit of data in this system is the {@code Entity}, which has an immutable identity (represented by a {@code Key}) and zero or more mutable properties. {@code Entity}objects can be created, updated, deleted, retrieved by identifier, and queried via a combination of properties.
The {@code DatastoreService} can be used transactionally andsupports the notion of a "current" transaction. A current transaction is established by calling {@link #beginTransaction()}. The transaction returned by this method ceases to be current when an attempt is made to commit or rollback or when another call is made to {@link #beginTransaction()}. A transaction can only be current within the Thread that created it.
The various overloads of put, get, and delete all support transactions. Users of this class have the choice of explicitly passing a (potentially {@code null}) {@link Transaction} to thesemethods or relying on the behavior governed by the {@link ImplicitTransactionManagementPolicy}. If a user explicitly provides a {@link Transaction} it is up to the user to call{@link Transaction#commit()} or {@link Transaction#rollback()} atthe proper time. If a user relies on implicit transaction management and the installed policy creates a transaction, that transaction will be committed (in the case of a success) or rolled back (in the case of a failure) before the operation returns to the user. The methods that manage transactions according to {@link ImplicitTransactionManagementPolicy} are:{@link #delete(Key)}, {@link #delete(Iterable)}, {@link #get(Key)}, {@link #get(Iterable)}, {@link #put(Entity)}, and {@link #put(Iterable)}.
The overload of prepare that takes a {@link Transaction}parameter behaves the same as the overloads of put, get, and delete that take a {@link Transaction} parameter. However, the overloadof prepare that does not take a {@link Transaction} parameter,unlike put, get, and delete, does not use an existing {@link Transaction} if one is already running and does not consultthe {@link ImplicitTransactionManagementPolicy} if one is notalready running.

    verify(input, inputReader, output, outputWriter);
  }


  @Test
  public void testDatastoreData() throws Exception {
    final DatastoreService datastoreService = DatastoreServiceFactory.getDatastoreService();
    // Datastore restriction: id cannot be zero.
    for (long i = 1; i <= 100; ++i) {
      datastoreService.put(new Entity(KeyFactory.createKey("Test", i)));
    }
    runTest(new MapReduceSpecification.Builder<>(new DatastoreInput("Test", 5), new TestMapper(),
        new TestReducer(), new InMemoryOutput<KeyValue<String, List<Long>>>())
        .setKeyMarshaller(Marshallers.getStringMarshaller())
        .setValueMarshaller(Marshallers.getLongMarshaller()).setJobName("Test MR").build(),
        new Verifier<List<List<KeyValue<String, List<Long>>>>>() {
          @Override
          public void verify(MapReduceResult<List<List<KeyValue<String, List<Long>>>>> result)
              throws Exception {
            Counters counters = result.getCounters();
            log.info("counters=" + counters);
            assertNotNull(counters);


            assertEquals(100, counters.getCounter("map").getValue());
            assertEquals(5, counters.getCounter("beginShard").getValue());
            assertEquals(5, counters.getCounter("endShard").getValue());
            assertEquals(5, counters.getCounter("beginSlice").getValue());
            assertEquals(5, counters.getCounter("endSlice").getValue());


            assertEquals(100, counters.getCounter(CounterNames.MAPPER_CALLS).getValue());
            assertTrue(counters.getCounter(CounterNames.MAPPER_WALLTIME_MILLIS).getValue() > 0);


            Query query = new Query("Test");
            for (Entity e : datastoreService.prepare(query).asIterable()) {
              Object mark = e.getProperty("mark");
              assertNotNull(mark);
            }


            List<KeyValue<String, List<Long>>> output =

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@SuppressWarnings("serial")
public class TestServlet extends HttpServlet {
  protected void doGet(HttpServletRequest req, HttpServletResponse resp)
      throws IOException {
    DatastoreService ds = DatastoreServiceFactory.getDatastoreService();
    String token = req.getParameter(Constant.TOKEN);


    Key k = KeyFactory.stringToKey(token);
    try {
      System.out.println(k.getId());
      Entity e = ds.get(k);
      resp.getWriter().print(e.getProperty("LoginDate"));
    } catch (EntityNotFoundException e) {
      e.printStackTrace();
    }
  }

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    public static JGNameValuePairs get(String kind,String id)throws JGException
  {
    
     checkThread();
     DatastoreService datastore = DatastoreServiceFactory.getDatastoreService();


     Key key = KeyFactory.createKey(kind,id);
     Entity entity = null;
     try{
     
             entity =    datastore.get(key);
     }catch (com.google.appengine.api.datastore.EntityNotFoundException enf){
       return null;
     }
            if (entity == null)return null;
            JGNameValuePairs jn = new JGNameValuePairs(new Hashtable(entity.getProperties()));

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           public static void transUpdate(String kind,Hashtable columns,long id,Key pk,jiqlConnection conn)throws Exception
  {




DatastoreService datastore = DatastoreServiceFactory.getDatastoreService();
 Transaction trans = datastore.beginTransaction();
 conn.setTransaction(trans);


          Key key = KeyFactory.createKey(pk,kind,id);
        Entity e = datastore.get(key);
     Enumeration en = columns.keys();
     String cn = null;
     Object o = null;
     while (en.hasMoreElements()){
        cn = en.nextElement().toString();  
           o = columns.get(cn);


         if (o instanceof String)
        {
         if (((String)o).length() > maxCL)
        o = new com.google.appengine.api.datastore.Text((String)o);
       }
         e.setProperty(cn,convert(o)); 
         }
 
       datastore.put(trans,e); 


        }

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        } 
static int maxCL = 500;
    public static void update(String kind,Hashtable columns,long id)throws Exception
  {
     checkThread();
     DatastoreService datastore = DatastoreServiceFactory.getDatastoreService();


     //Entity e = new Entity(kind,id); 
          Key key = KeyFactory.createKey(kind,id);
        Entity e = datastore.get(key);
     Enumeration en = columns.keys();
     String cn = null;
     Object o = null;
     while (en.hasMoreElements()){
        cn = en.nextElement().toString();  
           o = columns.get(cn);


         if (o instanceof String)
        {
          if (((String)o).length() > maxCL)
          o = new com.google.appengine.api.datastore.Text((String)o);
       }
         e.setProperty(cn,convert(o)); 
         }
       datastore.put(e); 


                
        }

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  public static void deleteWhere(String table,String field,Object value,Query.FilterOperator qf,Transaction trans)throws JGException
  {
    checkThread();
    Query q = new Query(table);
    q = q.addFilter(field,qf,value);
     DatastoreService datastore = DatastoreServiceFactory.getDatastoreService();
        PreparedQuery pq = datastore.prepare(q) ;
    //EZArrayList ez = new EZArrayList();
    //ez.addEnumeration(pq.asIterator());
    
    Iterator lst = pq.asIterator();
    Entity entity = null;
        ArrayList<Key> keys = new ArrayList<Key>(); 
    int ct = 0;
    while (lst.hasNext())
    {
      ct = ct + 1;
      checkThread(ct);
      entity = (Entity)lst.next();
      keys.add(entity.getKey());
    }
    checkThread();
    if (trans != null)
      datastore.delete(trans,keys); 
    else
         datastore.delete(keys); 
        }

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    //(" listWhere: " + ":" + qf + ":" + field + ":" + value + ":" + value.getClass().getName());




    Query q = new Query(table);
    q = q.addFilter(field,qf,convert(value));
     DatastoreService datastore = DatastoreServiceFactory.getDatastoreService();
        PreparedQuery pq = datastore.prepare(q) ;
    int ezt = pq.countEntities();
    if (ezt > fLimit)
      throw JGException.get("result_too_large",table + " Result too LARGE. Try narrowing query by adding more filters: " + ezt + ":" + qf + ":" + field + ":" + value + ":" + value.getClass().getName());


    Iterator lst = pq.asIterator();

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        o = new com.google.appengine.api.datastore.Text((String)o);
        
        }
         e.setProperty(cn,convert(o)); 
     }
     DatastoreService datastore = DatastoreServiceFactory.getDatastoreService();
       datastore.put(e); 
         return e.getKey().getId();






  }

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            if (((String)o).length() > maxCL)
          o = new com.google.appengine.api.datastore.Text((String)o);
       }
         e.setProperty(cn,convert(o)); 
     }
     DatastoreService datastore = DatastoreServiceFactory.getDatastoreService();
       datastore.put(e); 


  }

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            if (((String)o).length() > maxCL)
          o = new com.google.appengine.api.datastore.Text((String)o);
       }
         e.setProperty(cn,convert(o)); 
         }
     DatastoreService datastore = DatastoreServiceFactory.getDatastoreService();
    
              Throwable ex = null;   
   for (int ct = 0; ct < readTries;ct++)
{
try{ 
         //(entit + " put 2 " + columns);
//          EntityManager em = EMF.get().createEntityManager();
//Entity  tx = em.get ();


  Transaction trans = datastore.beginTransaction()  ;
  boolean suc = false;




try{


//tx.begin();
       datastore.put(e); 


         long k = e.getKey().getId();
trans.commit();
suc = true;
return k;

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