datastore

问题 I know two ways to save/load application settings: use PersistentStore use filesystem (store, since SDCard is optional) I'd like to know what are you're practicies of working with application settings? Using PersistentStore to save/load application settings The persistent store provides a means for objects to persist across device resets. A persistent object consists of a key-value pair. When a persistent object is committed to the persistent store, that object's value is stored in flash

问题 I need to assign a unique identifier to each entity in datastore. I've found AllocateIDs but the issue is that it generates integers and I use strings for the keys. Is it safe to convert the integer to a string or there is a risk of collision (i.e. datastore to return me the same integer that I'm currently using as a string key). ? 回答1: Let's clear some things first: The identifier part of an entity's key can either be a key name string or an integer numeric ID But not both. So when you save

问题 I'm new to software development. Now, I'm planning to design a small but useful software to help people recite and review the English words. As a long-time linux user, I found that user-oriented applications save user configuration in various ways, like XML, plain text, SQLite, etc. When I become a developer, the most important thing I suppose, is to choose some proper approach. So here is my question, how do most applications preserve their data? More specifically, could you please list some

问题 I am trying to run a very simple hello world application on Google Cloud with objectify but get an exception when trying to access the datastore for saving an entity. I am using the latest Google Cloud Tools (1.6.1) for eclipse (Oxygen 4.7.3a) and Java 8. Following the official Google quick star guide I was able to create a standard java project and run the hello word sample app on my local server from eclipse. Since the plugin let you add Objectify libraries to the project I decided to give

问题 I have two requirement to bind the EXT Js combo -- The first Item in the combo should have the fixed text such as "Unfilterd" -- After that I need to bind the data store to the above combo. The datastore has repated columnA values, so how can filter the datastore so that it has distinct rows in a columnA before binding the combo. Note: I am using the data store to bind the grid panle aswell, I do not want to create another call to database. That's the reason why I am looking for a solution to

问题 I would like to use the google cloud datastore emulator for a local project. I have already installed and ran the emulator with : gcloud beta emulators datastore start My app connects to it, but the problem is that I do not know how to fill it with entities since there is no user interface and my application requires some admin users to be present. I also tried to export the production database (datastore) with the following command: gcloud datastore export but couldn't make it work. Should I

问题 I've followed install instructions from source in here: http://docs.ckan.org/en/latest/maintaining/installing/install-from-source.html And from here: http://docs.ckan.org/en/latest/maintaining/datastore.html I added the datastore entry in ckan.plugins setting. I did Test the setup and it worked. However, when editing/creating a resource in CKAN web interface, the datastore tab or upload to datastore option does not show up. This a new install on a Ubuntu 16.04. CKAN version 2.6.2 Any help is

问题 I wrote a key/value store using SQLite3 and C . The function put_pair(key, value) accepts an empty key as a correct key and in the INSERT query the function lower(hex(randomblob(16))) generates a good key for this inserted row. But I don't know how to retrieve this key and return it by my function. Any suggestions? 回答1: You can use sqlite3_last_insert_rowid 回答2: When the key is not known, try searching by values that match the given condition and return the rows. Or if it is just the most

问题 I can't retrieve the local data (pinned objects) after re-open the app. I have this code in my controller: - (IBAction)btnAddTouched:(id)sender { PFObject *object = [PFObject objectWithClassName:@"Foobar"]; [object setValue:[[NSDate date] description] forKey:@"data"]; [object pinInBackgroundWithBlock:^(BOOL succeeded, NSError *error) { if (succeeded) { NSLog(@"Pinned OK"); }else{ NSLog(@"Erro: %@", error.localizedDescription); } }]; } - (IBAction)btnLoadTouched:(id)sender { PFQuery *query =

问题 I need to start my RFT scripts with a .bat script. I tried this with: "%IBM_RATIONAL_RFT_INSTALL_DIR%\rational_ft.exe" -datastore "C:\project" -playback "test" In the .bat file. With a test project in C:\project and a test script named test.java. When I start the batch file, RFT opens a playback window and is looking for the script. But I always receive a error: [Rational.Test.Ft.Application.ScriptPlaybackException: Could not get type for [test]. I found out that this must be a problem with