如何在ormlite數據庫中存儲arraylist

Question

我想將類對象的arraylist保存到ormlite數據庫中，但它給出錯誤java.lang.IllegalArgumentException：沒有字段在類java.util中具有DatabaseField註釋.ArrayList

我的代碼是

@DatabaseTable 
public class ManageModelDetails { 

@DatabaseField(generatedId = true) 
private int id; 

@DatabaseField(foreign = true, foreignAutoRefresh = true) 
private ArrayList<ModelDetails> listModelDetails; 

// =============================================== 
public ManageModelDetails() { 
    super(); 
} 

// =============================================== 

public ManageModelDetails(int id, ArrayList<ModelDetails> listModelDetails) { 
    super(); 
    this.id = id; 
    this.listModelDetails = listModelDetails; 
} 

// =============================================== 

public void setId(int id) { 
    this.id = id; 
} 

public int getId() { 
    return id; 
} 

public void setModelList(ArrayList<ModelDetails> listModelDetails) { 
    this.listModelDetails = listModelDetails; 
} 

public ArrayList<ModelDetails> getModelList() { 
    return listModelDetails; 
} 

} 

Answer 1

我認爲你需要使用外國集合。看看這裏：

• Foreign Collections
• Another similar question

Answer 2

如果要保存對象的ArrayList到ORMLite最簡單的方法是這樣的：

@DatabaseField(dataType = DataType.SERIALIZABLE) 
private SerializedList<MyObject> myObjects; 

，並讓我的物品清單：

public List<MyObject> getMyObjects() { 
    return myObjects; 
} 

這裏是SerializedList：

public class SerializedList<E> extends ArrayList<E> implements Serializable { 
}