google-cloud-datastore

问题 I use GAE NDB Python 2.7 My two Models code: class A(ndb.Model): def X(self, value): :: # some statements to return a value return range def Y(self, value): :: # some statements to return a value return range def Z(self, value): :: # some statements to return a value return range property_1 = ndb.IntegerProperty(default=0, indexed=False) property_2 = ndb.IntegerProperty(default=0, indexed=False) property_3 = ndb.IntegerProperty(default=0, indexed=False) property_4 = ndb.IntegerProperty

问题 I use GAE NDB Python 2.7 My two Models code: class A(ndb.Model): def X(self, value): :: # some statements to return a value return range def Y(self, value): :: # some statements to return a value return range def Z(self, value): :: # some statements to return a value return range property_1 = ndb.IntegerProperty(default=0, indexed=False) property_2 = ndb.IntegerProperty(default=0, indexed=False) property_3 = ndb.IntegerProperty(default=0, indexed=False) property_4 = ndb.IntegerProperty

问题 I want to create entity group in GAE Datastore such that one city have contain multiple suburbans. Following is my code :- //city.java @JsonIdentityInfo(generator=ObjectIdGenerators.IntSequenceGenerator.class, property="@id") @Entity public class City { @Id private String name; @OneToMany(mappedBy="city", cascade=CascadeType.ALL) private Suburban[] suburbans; public String getName() { return name; } public void setName(String name) { this.name = name; } public Suburban[] getSuburbans() {

问题 I want to create entity group in GAE Datastore such that one city have contain multiple suburbans. Following is my code :- //city.java @JsonIdentityInfo(generator=ObjectIdGenerators.IntSequenceGenerator.class, property="@id") @Entity public class City { @Id private String name; @OneToMany(mappedBy="city", cascade=CascadeType.ALL) private Suburban[] suburbans; public String getName() { return name; } public void setName(String name) { this.name = name; } public Suburban[] getSuburbans() {

问题 I just have a hunch about this. But if feels like I'm doing it the wrong way. What I want to do is to have a db.StringProperty() as a unique identifier. I have a simple db.Model, with property name and file. If I add another entry with the same "name" as one already in the db.Model I want to update this. As of know I look it up with: template = Templates.all().filter('name = ', name) Check if it's one entry already: if template.count() > 0: Then add it or update it. But from what I've read

问题 Which database does the Google AppEngine Eclipse plugin use? How do I view local_db.bin file which is in war/WEB-INF/appengine-generated. Is it SQLLite ? 回答1: give gae-data-viewer a shot. That should let you view all of the data. 回答2: The App Engine Java SDK uses its own in-memory representation, which it serializes to disk for persistence. An admin console data viewer/editor ought to be out in the next SDK release. 回答3: As far as I understood local_db.bin uses internal format named "protocol

问题 The following code is not working. Does anyone know how I might get it to work? Query q = new Query("Product"); Iterable<Entity> entities = datastore.prepare(q).asIterable(); for (Entity entity : datastore.prepare(q).asIterable()) { entity.setProperty(“sale”, false); } datastore.put(entities); sale is a completely new field that I am adding to the entity kind. So it does not exist yet. UPDATE I fixed it as below but the code is still not working Query q = new Query("Product"); Iterable<Entity

问题 I'm trying to use the Google cloud datastore command line interface to create arrays of embedded entities. I've figured out how to create an embedded entity value as follows: { "properties": { "age": { "integerValue": "5" }, "height": { "integerValue": "6" } } } and how to create an array value as follows: { "values": [ { "stringValue": "one" }, { "stringValue": "two" } ] } But I haven't figured out how to add an embedded value to an array. For example: { "values": [ { "stringValue": "one" },

问题 I have a number of items which are bookable in certain timeslots. Eg. a tennis court. So each item has got a number of associated availability slots each defined by begintime and endtime. Begintime and endtime are defined as datetime-objects so an availability slot from 09.00 - 11.30, is stored as eg. 2013-12-13 09.00 (begintime) to 2013-12-13 11.30 (endtime). When a booking request comes in, I need to find out whether the tennis court is available for the desired timeslot. So I am trying to

问题 I am trying to retrieve a sorted list of the players scores from a datastore Entity of type"User" After executing: List<User> entities = ofy().load().type(User.class).order("-score").list(); Knowing that I indexed the "score" attribute. Here is the "User.class" @Id String userName; String password; @Index int score; The entities seem to be null and i can't get the entities details.What am I missing??? I am still working on that I managed to modify the method to: @Override public User display(