google-cloud-datastore

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How to order by the field stored in the separate model?

Here is simplified version of my datastore structure: class News(db.Model): title = db.StringProperty()[详细]

2023-04-13 03:29 分类：问答
Escaping string literal "by", sql reserved word, while creating java Query object

The following code is throwing exception because string field has the SQL reserved word \"by\" in it. How would I escape this reserved word. The code is meant for google datastore.[详细]

2023-04-13 01:39 分类：问答
What is the best way to migrate data from BigTable/GAE Datastore to RDBMS?

Now that Google has announced availability of Cloud SQL storage for app engine, what will be the best way to migrate existing data from BigTable/GAE Datastore to MySQL?[详细]

2023-04-12 20:48 分类：问答
Is a re-tried transation after transaction collision safe?

Can a failed — with \"transaction collision\" — write operation to an entity overwrite changes made to the same entity on the other successfully committed transaction?[详细]

2023-04-12 20:09 分类：问答
App Engine Datastore - Incrementing property increments by 2

I\'m trying to build out a simple app engine datastore entity that basically keeps count of how many times it was viewed.I\'ve got the code setup in a JSP file that does increment the variable, howeve[详细]

2023-04-11 21:51 分类：问答
How to organize news/ratings/comments database?

My site will have news with possibility to rate them and leave comments. Each user will be able to rate one news only once and leave only one comment. At the same time, I should know which user rated[详细]

2023-04-11 14:50 分类：问答
Restoring production gae data to the dev server

Does anyone have a solution to restore production gae data to a dev server 开发者_高级运维for testing?The Bulkuploader tool does not cater for models with Blob Properties.Any hints?The bulkloader work[详细]

2023-04-10 16:24 分类：问答
GQL Not Recognising a ReferenceProperty in Filter

I have a datastore thats has ~850 groups and ~19,000 items. Each item may belong to only one group, I have two models in my app that represent a Group and an Item:[详细]

2023-04-09 05:52 分类：问答
Google App Engine JDO Query using Alternate logic for 'NOT IN'

I\'m developing a Googl开发者_开发问答e App Engine Java app where users can search business objects from database based on search criteria.[详细]

2023-04-09 05:27 分类：问答
How to add multiple records into a google app engine datastore

I am trying to update a datastore by uploading a formatted file(contains multiple lines). Each line in the file will create a new record in google app engine datastore. I am not sure how to add multip[详细]

2023-04-08 16:48 分类：问答