greenDao的使用
- 在 Android Studio的build.gradle文件中添加
classpath 'org.greenrobot:greendao-gradle-plugin:3.0.0'
编译之后进行下一步
2. 在 app 文件夹的build.gradle 文件中配置
apply plugin: 'org.greenrobot.greendao'
compile 'org.greenrobot:greendao:3.0.1'
设置greenDao的路径：
greendao {
schemaVersion 1
daoPackage 'com.demo.db'
targetGenDir 'src/main/java'
}
3. 创建实体类
比如user：
@Entity
public class User {
@Id(autoincrement = true)
private Long id;
@NotNull
@Unique
@Property(nameInDb = "user_number")
private String userNumber;
@NotNull
@Property(nameInDb = "user_password")
private String userPassword;
}
4. 点击 锤子 Make Project
greenDao会生成两个实体类对应的dao文件，比如 userDao
以及DaoMaster和DaoSession
5. 创建对象以及实例化
private DaoMaster.DevOpenHelper mHelper;
private SQLiteDatabase db;
private DaoMaster mDaoMaster;
private DaoSession mDaoSession;
private UserDao mUserDao;
private User mUser;
mHelper = new DaoMaster.DevOpenHelper(this, "demo-db", null);
db = mHelper.getWritableDatabase();
mDaoMaster = new DaoMaster(db);
mDaoSession = mDaoMaster.newSession();
mUserDao = this.getDaoSession().getUserDao();
添加两个方法：
private DaoSession getDaoSession() {
return mDaoSession;
}
private SQLiteDatabase getDb() {
return db;
}
6. 插入，查询操作
// greenDao 插入
mUser = new User((long) 2, "100", "100");
mUserDao.insertOrReplace(mUser);
// greenDao 查询
List<User> users = mUserDao.loadAll();
for (int i = 0; i < users.size(); i++) {
if (users.get(i).getUserNumber().equals(mEtUsername.getText().toString())
&& users.get(i).getUserPassword().equals(mEtPassword.getText().toString())) {
Toast.makeText(this, "登录成功", Toast.LENGTH_LONG).show();
startActivity(new Intent(this, IndexActivity.class));
}
}
