问题描述
如何保存在Android的使用ORMlite我的模型如下一个ArrayList
How to save an ArrayList using ORMlite in android my model is as follows
class Model{
@DatabaseField
public String type = "";
@DatabaseField
public String name = "";
@DatabaseField
public Date dateTime = null;
@DatabaseField
ArrayList<Item> items = null;
}
和项目类有
class Item{
@DatabaseField
String itemName;
...
}
我收到以下异常:
I am getting the following exception :
java.sql.SQLException: ORMLite can't store unknown class class
java.util.ArrayList for field 'items'. Serializable fields must specify
dataType=DataType.SERIALIZABLE
但是,当我指定我的字段
But when i specify my field as
@DatabaseField(dataType = DataType.SERIALIZABLE)
ArrayList<Item> items = null;
编译器提供了一个名为场误差不能得到解决,请帮助我。
The compiler gives a error called field cannot be resolved please help me with this.
推荐答案
我刚刚换了错误消息是:
I've just changed the error message to be:
ORMLite不知道如何存储类
java.util.ArrayList的现场项目。使用另一个类,定制的持留,或序列化使用它的dataType = DataType.SERIALIZABLE
也许更有意义? 是想说,它不知道如何存储列表中的一个字段。如果要存放物品的集合,那么也许你应该看看在。
Maybe that makes more sense? ORMLite is trying to say that it doesn't know how to store lists in a field. If you want to store collection of items then maybe you should take a look at the foreign-collection documentation.
这篇关于在ormlite Android的使用DataType.SERIALIZABLE对象的存储目录的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!