GreenDao 3.2.2 使用总结

本文主要是介绍GreenDao 3.2.2 使用总结，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

1  module  gradle配置

    

apply plugin: 'org.greenrobot.greendao'

greendao {schemaVersion 5    //每次数据库升级+1
    daoPackage 'xx.xx.xx.greendao.gen'
    targetGenDir 'src/main/java'
}

dependencies {compile 'org.greenrobot:greendao:3.2.2'
    compile 'com.github.yuweiguocn:GreenDaoUpgradeHelper:v2.0.0'//数据库升级工具

}

2. 创建GreenDao工具类 GreenDaoManager 

public class GreenDaoManager {private DaoMaster mDaoMaster;
    private DaoSession mDaoSession;
    private static GreenDaoManager mInstance; //单例
    private GreenDaoOpenHelper openHelper;

    private GreenDaoManager() {SLFLogUtils.e("当前数据库版本号："+SCHEMA_VERSION);
        if (mInstance == null) {openHelper = new
                    GreenDaoOpenHelper(PosApplication.mContext, "/sdcard/xxx/xx-db", null);
            mDaoMaster = new DaoMaster(openHelper.getWritableDatabase());

            mDaoSession = mDaoMaster.newSession();
        }}public static GreenDaoManager getInstance() {if (mInstance == null) {synchronized (GreenDaoManager.class) {//保证异步处理安全操作
                if (mInstance == null) {mInstance = new GreenDaoManager();
                }}}return mInstance;
    }public DaoSession getSession() {return mDaoSession;
    }class GreenDaoOpenHelper extends DaoMaster.OpenHelper {public GreenDaoOpenHelper(Context context, String name, SQLiteDatabase.CursorFactory factory) {super(context, name, factory);
        }@Override
        public void onUpgrade(Database db, int oldVersion, int newVersion) {SLFLogUtils.e(oldVersion + "升级到----->" + newVersion);
            MigrationHelper.DEBUG = true;
            MigrationHelper.migrate(db, new MigrationHelper.ReCreateAllTableListener() {@Override
                public void onCreateAllTables(Database db, boolean ifNotExists) {DaoMaster.createAllTables(db, ifNotExists);
                }@Override
                public void onDropAllTables(Database db, boolean ifExists) {DaoMaster.dropAllTables(db, ifExists);
                }}, SerialBeanDao.class, ReverseBeanDao.class, UserBeanDao.class);
        }}}

3.Application 初始化类GreenDaoManager 

public static GreenDaoManager dbManager;

dbManager = GreenDaoManager.getInstance();

4.创建Bean

@Entity
public class xxxBean {@Id(autoincrement = true)private Long id;
    //xxx
    private Byte xxx;
    //xxx
    private String xxxx;

    }

编译后studio自动创建set get  以备读取数据库字段值

5. 使用

SerialBeanDao serialBeanDao = PosApplication.dbManager.getSession().getxxxBeanDao();

具体方法请参照GreenDao sdk使用说明，详见如下地址

http://greenrobot.org/greendao/documentation/queries/

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