Android 常用的ORM框架详解

@SuppressWarnings("serial")
@Entity(table="users")
public class Users extends Model<Users>implements Serializable{
	@PrimaryKey//自增的话，@PrimaryKey(autoIncrement=true)
	@Column(name="user_id",type="int")//映射的字段名和类型，类型可以省略不写
	public int userId;
	@Column(name = "user_name",type="text")
	public String userName;
	@Column(name="user_password",type="text")
	public String userPassword;
	@Column(name="login_time",type="text")
	public String loginTime;
	
	@Override
	public void update() {
		Model.execute(ModelQuery.update().from(Users.class)
				.set(Users.class, "user_name", userName)
				.set(Users.class, "user_password",userPassword)
				.set(Users.class, "login_time", loginTime)
				.where(C.eq("user_id", userId))
				.getQuery());
	}
}

Database db = new SQLiteAndroid(this, AppConfig.DATABASE_PATH+AppConfig.DATABASE_FILENAME);
        MappingSession.registerDatabase(db);
        //注册实体类
        MappingSession.registerEntity(Users.class);
        MappingSession.registerEntity(Channel.class);
        MappingSession.registerEntity(RSSItem.class);

//查询
user = Model.fetchSingle(ModelQuery.select().from(Users.class).
where(C.eq("user_id", id)).getQuery(), Users.class);
//查询更多
List<Users> users = Model.fetchQuery(ModelQuery.select().from(Users.class).where(
C.like("user_name", "%2%")).getQuery(), Users.class);