Litepal一款用於使用Android資料庫的開源工具

https://github.com/LitePalFramework/LitePal

SQLiteDatabasedb=LitePal.getDatabase();

Upgrade tables

<versionvalue="2" />

Save data

Albumalbum=newAlbum();

album.setName("album");

album.setPrice(10.99f);

album.setCover(getCoverImageBytes());
 

album.save();

Update data

AlbumalbumToUpdate=LitePal.find(Album.class, 1);

albumToUpdate.setPrice(20.99f); // raise the price

albumToUpdate.save();

AlbumalbumToUpdate=newAlbum();

albumToUpdate.setPrice(20.99f); // raise the price

albumToUpdate.update(id);

Album
 
albumToUpdate=newAlbum();

albumToUpdate.setPrice(20.99f); // raise the price

albumToUpdate.updateAll("name = ?", "album");

Delete data

LitePal.delete(Song.class, id);

LitePal.deleteAll(Song.class, "duration > ?" , "350");

Query data

Songsong=LitePal.find(Song.class, id);
 

List<Song>allSongs=LitePal.findAll(Song.class);

List<Song> songs =LitePal.where("name like ? and duration < ?", "song%", "200").order("duration").find(Song.class);

Async operations

Every database operation is on main thread by default. If your operation might spent a long time, for example saving or querying tons of records. You may want to use async operations.

LitePal support async operations on all crud methods. If you want to find all records from song table on a background thread, use codes like this.

LitePal.findAllAsync(Song.class).listen(newFindMultiCallback<Song>() {

@Override

publicvoidonFinish(List<Song>allSongs) {

    }

});

Just use findAllAsync() instead of findAll(), and append a listen() method, the finding result will be callback to onFinish()method once it finished.

Abd saving asynchronously is quite the same.

Java:

Albumalbum=newAlbum();

album.setName("album");

album.setPrice(10.99f);

album.setCover(getCoverImageBytes());

album.saveAsync().listen(newSaveCallback() {

@Override

publicvoidonFinish(booleansuccess) {

    }

});

Multiple databases

If your app needs multiple databases, LitePal support it completely. You can create as many databases as you want at runtime. For example:

LitePalDBlitePalDB=newLitePalDB("demo2", 1);

litePalDB.addClassName(Singer.class.getName());

litePalDB.addClassName(Album.class.getName());

litePalDB.addClassName(Song.class.getName());

LitePal.use(litePalDB);

This will create a demo2 database with singer, album and song tables.

If you just want to create a new database but with same configuration as litepal.xml, you can do it with:

LitePalDBlitePalDB=LitePalDB.fromDefault("newdb");

LitePal.use(litePalDB);

You can always switch back to default database with:

LitePal.useDefault();

And you can delete any database by specified database name:

LitePal.deleteDatabase("newdb");

Listen database create or upgrade

If you need to listen database create or upgrade events and fill some initial data in the callbacks, you can do it like this:

LitePal.registerDatabaseListener(newDatabaseListener() {

@Override

publicvoidonCreate() {

         // fill some initial data

    }

@Override

publicvoidonUpgrade(intoldVersion, intnewVersion) {

         // upgrade data in db

    }

});