google-cloud-datastore

问题 I just migrated to HRD and now its telling me i cant access my own blobs... Uncaught exception from servlet java.lang.SecurityException: This application does not have access to that blob. at com.google.appengine.api.blobstore.BlobstoreServiceImpl.fetchData(BlobstoreServiceImpl.java:200) at com.droidastic.telljokes.server.servlet.ServeBlobsServlet.checkBlobKeyExists(ServeBlobsServlet.java:100) at com.droidastic.telljokes.server.servlet.ServeBlobsServlet.doGet(ServeBlobsServlet.java:64) 回答1:

问题 from this article https://stackoverflow.com/a/32107024/5258689 I have a dict() subclass - that allows me to do dict.key (use dot to access keys i mean) - as follows: class Permissions(dict): """ Example: m = Map({'first_name': 'Eduardo'}, last_name='Pool', age=24, sports=['Soccer']) """ def __init__(self, *args, **kwargs): super(Permissions, self).__init__(*args, **kwargs) for arg in args: if isinstance(arg, dict): for k, v in arg.iteritems(): self[k] = v if kwargs: for k, v in kwargs

问题 I am using objectify to persist objects to Google Cloud datastore. The "primary key" is annotated with @Id. @Entity class Car { @Id Long id; ... } I generate the client endpoint (using Android Studio). I need getters and setters for all fields, including id, so that REST is able to serialize and deserialize the object. If I don't add getters and setters, then these are created by the Google endpoint builder. Normally, the client GETs an instance from datastore, changes attributes and UPDATEs

问题 I am using Google Datastore for an Android application, the backend is written in Java. In one table, I want to set multiple values to the same property: Entity newGroup = new Entity("group"); newGroup.setProperty("member", "A"); newGroup.setProperty("member", "B"); newGroup.setProperty("member", "C"); datastore.put(newGroup); I then want to query to find all groups a user belongs to, I do the following: Query.Filter filter = new Query.FilterPredicate("member", Query.FilterOperator.EQUAL, "A"

问题 I am using Google Datastore for an Android application, the backend is written in Java. In one table, I want to set multiple values to the same property: Entity newGroup = new Entity("group"); newGroup.setProperty("member", "A"); newGroup.setProperty("member", "B"); newGroup.setProperty("member", "C"); datastore.put(newGroup); I then want to query to find all groups a user belongs to, I do the following: Query.Filter filter = new Query.FilterPredicate("member", Query.FilterOperator.EQUAL, "A"

问题 Say I've got an entity with a StringListProperty: 'ids' - a list of ids associated with the entity. I then want to query for that entity by asking if a given id is in ids. I know you can use filter q.filter("last_name IN", list) but I need the reverse, something like: q.filter('id' IN ids)?? or q = db.GqlQuery("SELECT * FROM entity WHERE :1 IN ids", id) https://developers.google.com/appengine/docs/python/datastore/queries 回答1: It's just q.filter('ids', id) . 来源： https://stackoverflow.com

问题 Say I've got an entity with a StringListProperty: 'ids' - a list of ids associated with the entity. I then want to query for that entity by asking if a given id is in ids. I know you can use filter q.filter("last_name IN", list) but I need the reverse, something like: q.filter('id' IN ids)?? or q = db.GqlQuery("SELECT * FROM entity WHERE :1 IN ids", id) https://developers.google.com/appengine/docs/python/datastore/queries 回答1: It's just q.filter('ids', id) . 来源： https://stackoverflow.com

问题 Question is: does ds.put(employee) happen in transaction? Or does the outer transaction get erased/overriden by the transaction in saveRecord(..)? Once error is thrown at line datastore.put(..) at some point in the for-loop (let's say i==5), will previous puts originating on the same line get rollbacked? What about puts happening in the saveRecord(..). I suppose those will not get rollbacked. DatastoreService datastore = DatastoreServiceFactory.getDatastoreService() Transaction txn =

问题 Question is: does ds.put(employee) happen in transaction? Or does the outer transaction get erased/overriden by the transaction in saveRecord(..)? Once error is thrown at line datastore.put(..) at some point in the for-loop (let's say i==5), will previous puts originating on the same line get rollbacked? What about puts happening in the saveRecord(..). I suppose those will not get rollbacked. DatastoreService datastore = DatastoreServiceFactory.getDatastoreService() Transaction txn =

问题 I'm using java to code for GAE, I've read through the GAE Java low level API and can't find any answer to my question yet. I wanna know if there's a way where I can call a method/do a JDOPL and it returns all the different kinds of entities in my Datastore. 回答1: You could use the datastore statistics API: http://code.google.com/appengine/docs/java/datastore/stats.html It looks like the __Stat_Kind__ statistic will give you the info you want. 回答2: I found a working solution here. (it doesn't