ORMLite多对多关系

本文介绍了ORMLite多对多关系的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 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