ORMLite多对多关系 [英] ORMLite many to many relation

问题描述

为了做出许多与ORMLite这两个类之间有许多关系：

  @DatabaseTable（tableName值=测试1）
公共类的Test1 {
    @ForeignCollectionField
    私人ForeignCollection＆LT;＆的Test2 GT; test2Collection;
}@DatabaseTable（tableName值=测试2）
公共类的Test2 {
    @ForeignCollectionField
    私人ForeignCollection＆LT;＆Test1的GT; test1Collection;
}
 

我面临到ORMLite在创建表的问题，不知道这个类..

之间的外键

为了使这种关系我必须对每个类一样，添加一个ForeignDtabaseField：

  @DatabaseTable（tableName值=测试1）
    公共类的Test1 {
        @DatabaseField（外资= TRUE，foreignAutoRefresh = TRUE）
    私人的Test2 TEST2;
        @ForeignCollectionField
        私人ForeignCollection＆LT;＆的Test2 GT; test2Collection;
    }
 @DatabaseTable（tableName值=测试2）
    公共类的Test2 {
        @DatabaseField（外资= TRUE，foreignAutoRefresh = TRUE）
    私人测试1测试1;
        @ForeignCollectionField
        私人ForeignCollection＆LT;＆Test1的GT; test2Collection;
    }
 

这似乎是一个奇怪的方式..？

解决方案

  

为了使这种关系我必须对每个类一样，添加一个ForeignDatabaseField：

是的。你的第二个例子是正确的。没有为 ORMLite 没有其他办法能够弄清楚如何使用测试1 正在以的Test2 实例相关联，反之亦然。

请参阅文档：

• 异物


• 外国收藏

In order to make a many to many relation between these two class with ORMLite :

@DatabaseTable(tableName = "test1")
public class Test1 {
    @ForeignCollectionField
    private ForeignCollection<Test2> test2Collection;
}

@DatabaseTable(tableName = "test2")
public class Test2{
    @ForeignCollectionField
    private ForeignCollection<Test1> test1Collection;
}

I'm facing to the problem that ORMLite at the tables creation, don't know about the Foreign Keys between this class..

In order to make this relation do I have to add a single ForeignDtabaseField on each class like that :

 @DatabaseTable(tableName = "test1")
    public class Test1 {
        @DatabaseField(foreign = true, foreignAutoRefresh = true)
    private Test2 test2;
        @ForeignCollectionField
        private ForeignCollection<Test2> test2Collection;
    }
 @DatabaseTable(tableName = "test2")
    public class Test2 {
        @DatabaseField(foreign = true, foreignAutoRefresh = true)
    private Test1 test1;
        @ForeignCollectionField
        private ForeignCollection<Test1> test2Collection;
    }

It seems to be a strange way.. ?

解决方案

In order to make this relation do I have to add a single ForeignDatabaseField on each class like that:

Yes. Your second example is correct. There is no other way for ORMLite to be able to figure out how the Test1 that are associated with a Test2 instance and vice versa.

See the docs:

• Foreign objects
• Foreign collections

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