Question

我试图在DB表中存储一个类Object，但似乎ormlite不接受对象类型，这里是我的数据库表：

Temp_Contacts数据库表

public class Temp_Contacts {

    @DatabaseField(generatedId = true,canBeNull = false)
    private int id;

    @DatabaseField
     private Contacts contacts;

    @DatabaseField
    private Date data_actualizare;

    Temp_Contacts(){}

    public Temp_Contacts(Contacts contacts, Date data_actualizare){
            this.contacts=contacts;
            this.data_actualizare=data_actualizare;
    }

    public Contacts getContacts() {
        return contacts;
    }

    public void setContactsList(Contacts contacts) {
        this.contact = contacts;
    }

    public Date getData_actualizare() {
        return data_actualizare;
    }

    public void setData_actualizare(Date data_actualizare) {
        this.data_actualizare = data_actualizare;
    }
}

通讯录类

public class Contacts {

    private int ID;
    private String name;
    private List<Telefon> numbers;
    private List<Email> emails;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public List<Telefon> getNumbers() {
        return numbers;
    }

    public void setNumbers(List<Telefon> numbers) {
        this.numbers = numbers;
    }

    public List<Email> getEmails() {
        return emails;
    }

    public void setEmails(List<Email> emails) {
        this.emails = emails;
    }

    public int getID() {
        return ID;
    }

    public void setID(int ID) {
        this.ID = ID;
    }
}

这样做的主要目的是在ormlite DB中将对象类存储在Contacts类中。我更喜欢这种逻辑，但我也对其他建议持开放态度。

Answer 1

基本上你必须将它拆分成不同的表，以便ORMLite正确处理它并拥有干净的数据库设计。
您最终会有4个表：Temp_Contacts，Contacts，Email和Phone：

public class Temp_Contacts {

    @DatabaseField(generatedId = true,canBeNull = false)
    private int id;

    // declare Contacts as a foreign key
    // automatically fetched when Temp_Contacts is loaded
    @DatabaseField(foreign=true, foreignAutoRefresh=true)
    private Contacts contacts;

    @DatabaseField
    private Date data_actualizare;

    ...
 }

联系人：

public class Contacts {

   @DatabaseField(id = true,canBeNull = false)
   private int ID;

   @DatabaseField
   private String name;

   // Use foreign collections for Telefon and Email
   // that are loaded with Contacts
   @ForeignCollectionField(eager = true)
   private ForeignCollection<Telefon> numbers;

   @ForeignCollectionField(eager = true)
   private ForeignCollection<Email> emails;     

   ...
}

Telefon和电子邮件

public class Telefon {

    // Reference to the Contact object has to be there
    @DatabaseField(canBeNull = false, foreign = true)
    private Contacs contacts;

    ...

}

public class Email {

    // Reference to the Contact object has to be there
    @DatabaseField(canBeNull = false, foreign = true)
    private Contacs contacts;

    ...

}

这对应于以下数据库结构：

Temp_Contacts：

| id | contacts_id | data_actualizare |

联系人：

| id |名字|

Telefon和电子邮件

| contacts_id | otherfields |

有关ForeignObjects和ForeignCollections的详情，请参阅ORMLite documentation

使用ormlite android存储对象字段

1 个答案: