GreenDao

綠道Heaton

Outline

• Why GreenDao• Feature• Performance• How to getting start• How to use.

Why GreenDao

• First . Some problem with DB Development.– No object orientation.– Data access sentence is low levely.– Always make same code to write SQL script.– Do you know SQL without 『 ||』 .– I am stupid on SQL tuning

• Second , it is faster than other ORM Lib.

It is popular?

Features

• High Performance– CRD test.

• ORM (Object relation mapping)– Code Generation– Read and write objects – CREATE TABLE done for you – Expressing Queries

• Session cache• Setter ; getter• Create table “table_name”• Return List<Common>

Performance• Test case :

– insert 10000 row– delete 10000 row – query 20000 row

Test 1 Dao Content Provider

Insert 1467 87268 (no transcation)

Load 1608 9797

Delete 108 121

Test 2

Insert 662 87766

Load 1837 12282

delete 137 127

Benchmark

• https://github.com/daj/android-orm-benchmark

• Write 10000• Read 10000

ORM Object/relation mapping (ORM)

A example for presentation

• Implement a social data collector• “Leftpage” as table name for database

“leftpageProvider.db”• Every row data as “CommonData”• Column has – ”DataID” as primary key – “Category” – “Provider” – “DisplayOrder”

Expressing Queries: What difference

• SQL Query all– Cursor c =

mContext.getContentResolver().query(uriLPageProvider , projection , selection, selection args, sort order ) ;

• GreenDao Load all List<commonData> datas =

CommonDataDao.loadAll();

Sqlite review• SQL Query – Provider equal facebook– Order by display order– Limit data count100

• Cursor c = getContentResolver() . query (uriLPageProvider , projection , selection, selection args, sort order ) ;

(String ) selection : StorageField.Provider. + "=?" =(String[])selection args: {“facebook”}

Sort order• SQL Query – Provider equal facebook– Order by display order– Limit data count100

• Cursor c = getContentResolver() . query (uriLPageProvider , projection , selection, selection args, sort order ) ;

(String ) Sort order: StorageField.Displayorder

More detail• SQL Query – Provider equal facebook– Order by display order– Limit data count100

• Cursor c = getContentResolver() . query (uriLPageProvider , projection , selection, selection args, sort order ) ;

(String ) Sort order:“ ASC ” + StorageField.Displayorder + “ LIMIT ” + request

If you are sqlite master• SQL Query – Provider equal facebook– Order by display order– Limit data count100• Select * from leftpage where Provider =

‘facebook’ order asc ‘displayorder’ limit ‘100’

• Then you also load cusor and save to data list

But in GreenDao• SQL Query – Provider equal facebook– Order by display order– Limit data count100

mCommonDataDao.queryBuilder() .where(Properties.Provider.eq(Provider.Facebook)) .orderAsc(Properties.DisplayOrder) .limit(100) .list();

HOW TO GETTING START

Create module

How to getting start?

First time is terrible

Create a module to gen greendao code

• In module gradle– Add Gradle script– compile 'de.greenrobot:greendao-generator:1.3.1

Create main() in our case.public class GreenDao { public static void main(String[] args){ Schema schema = new Schema

(1, "com.acer.android.leftpage.provider");

Entity commonData = schema.addEntity("commonData"); commonData.setTableName("LeftPage"); commonData.addLongProperty("DataID").primaryKey(); commonData.addStringProperty("Category"); commonData.addStringProperty("Provider"); commonData.addLongProperty(“DisplayOrder”); commonData.addContentProvider();DaoGenerator generator = new DaoGenerator(); generator.generateAll

(schema, "../AcerHome/LeftPage/src/main/java/");}

Compile and run to Auto gen Core classes

DaoMaster

DaoSeesion

CommonDataDao

CommonData

In CommonDataDao public static void createTable(SQLiteDatabase db, boolean ifNotExists) { String constraint = ifNotExists? "IF NOT EXISTS ": ""; db.execSQL("CREATE TABLE " + constraint + "'LeftPage' (" + // "'DataID' INTEGER PRIMARY KEY AUTOINCREMENT ," + // 0:

DataID "'Category' TEXT," + // 1: Category "'Provider' TEXT," + // 2: Provider "'DisplayOrder' INTEGER DEFAULT -1," + // 3: DisplayOrder "'Bookmarked' INTEGER DEFAULT 0," + // 4: Bookmarked "'Deleted' INTEGER DEFAULT 0," + // 5: Deleted "'Score' REAL DEFAULT -1," + // 6: Score "'Keywords' TEXT DEFAULT NULL," + // 7: Keywords

CommonData content public Long getDataID() { return DataID; } public void setDataID(Long DataID) { this.DataID = DataID; } …… …… ……

Add it and start to use

• In Used Project gradle– compile 'de.greenrobot:greendao:1.3.7'

HOW TO USEINSERT , DELETE , UPDATE,

Initial

• DaoMaster.DevOpenHelper helper = new DaoMaster.DevOpenHelper(context,”leftpageprovider.db”);

• DaoMaster master = new DaoMaster (helper.getDataBase());

• DaoSession session = master.newSession();• CommonDataDao CommonDataDao=

session.getCommonDataDao();

Query• Query with syntax

– eq , notEq– ge , le , gt , lt– in , between– like

• List<commonData> dataList = CommonDataDao.queryBuilder()

.where(Properties.Provider.eq(Provider.Social)) .orderAsc(mCommonDataDao.Properties.DisplayOrder)

.list();

Raw query SQLiteDatabase db =

daoSession.getDatabase(); Cursor cursor = db.rawQuery("SELECT *FROM

leftpage WHERE .....", null);

Insert• Insert:

– CommonDataDao .insert(new CommonData(DATA_ID, arg1, arg2,x……));

• Bulk Insert – CommonDataDao .insertln(CommonDataList);– CommonDataDao.insertln(CommonData[]);

• InsetOrReplace– CommonDataDao.insertOrReplaceln(CommonDataList)

Note: DATA_ID usually is null .

Delete

• Delete sentence– CommonDataDao.QueryBuilder()

.where(Properties.Provider.eq(facebook))

.buildDelete() .executeDeleteWithoutDetachingEntities();

• Delete all– CommonDataDao.deleteAll();

Update

• Update sentence– CommonDataDao.update(new

CommonData(Data_ID , arg1 , arg2 , …….));• Bulk Update – CommonDataDao.updateln(CommonDataList);– CommonDataDao.updateln(CommonData[]);

Note: DATA_ID must assign what the row you want to update.

Thanks Reference: http://greendao-orm.com/features/

http://bng86.gitbooks.io/android-third-party-/content/greendao.html

http://www.slideshare.net/SmileeYang/greendao-43892958?qid=b95e0f35-a323-4930-8e8a-d0e298a1eb10&v=qf1&b=&from_search=1

http://www.slideshare.net/ssuser8674c1/green-dao-50914708?qid=b95e0f35-a323-4930-8e8a-d0e298a1eb10&v=qf1&b=&from_search=5

Something here AsyncSession asyncSession =

DBHelper.getInstance(this).getAsyncSession(); asyncSession.insert( new CommonData(null, …, …));