Java ORMLite抽象类的外部集合

我有4门课：

@DatabaseTable(tableName = "bucket")
public class Bucket {
    ...
    @ForeignCollectionField(eager = true)
    private Collection<Good> goods;
    ...
}

public abstract class Good {
    ...
    @DatabaseField(foreign = true, foreignAutoCreate = true, foreignAutoRefresh = true)
    private Bucket bucket;
    ...
}

@DatabaseTable(tableName = "bread")
public class Bread extends Good {
    ...
}

@DatabaseTable(tableName = "milk")
public class Milk extends Good {
    ...
}

有办法解决这个问题吗？

---

或者我甚至不能创建抽象类的ForeignCollectionField？

我发现解决这个问题非常简单

我刚刚从

Bucket

模型中删除了

@ForeignCollectionField

。所以，在

Bucket

表中，ORMLite对

好的
实体一无所知

持久化数据：

// 1 using bucketDao add bucket
bucketDao.add(bucket)
// 2 iterate over collection
for (Bread bread: breadList) {
  bread.setBucket(bucket); // set current bucket to good item
  breadDao.add(bread); // using breadDao add bread
}
// 3 do the same with milk collection
for (Milk milk: milkList) {
  milk.setBucket(bucket);
  milkDao.add(milk);
}

int bucketId = 1; // for example working with bucket with id=1
Bucket bucket = bucketDao.queryForEq("id", bucketId)); // query for this bucket
List<Milk> milkList = milkDao.queryForEq("bucket_id", bucketId); // query for all milks, that has a foreign key to current bucket
List<Break> breadList = breadDao.queryForEq("bucket_id", bucketId); // the same for bread

// finally set milks and breads to Good collection inside Bucket
List<Good> goodList = new ArrayList<>();   
goodList.addAll(milkList);   
goodList.addAll(breadList);   
bucket.setGoods(goodList);

加载数据：

// 1 using bucketDao add bucket
bucketDao.add(bucket)
// 2 iterate over collection
for (Bread bread: breadList) {
  bread.setBucket(bucket); // set current bucket to good item
  breadDao.add(bread); // using breadDao add bread
}
// 3 do the same with milk collection
for (Milk milk: milkList) {
  milk.setBucket(bucket);
  milkDao.add(milk);
}

int bucketId = 1; // for example working with bucket with id=1
Bucket bucket = bucketDao.queryForEq("id", bucketId)); // query for this bucket
List<Milk> milkList = milkDao.queryForEq("bucket_id", bucketId); // query for all milks, that has a foreign key to current bucket
List<Break> breadList = breadDao.queryForEq("bucket_id", bucketId); // the same for bread

// finally set milks and breads to Good collection inside Bucket
List<Good> goodList = new ArrayList<>();   
goodList.addAll(milkList);   
goodList.addAll(breadList);   
bucket.setGoods(goodList);

int-bucketId=1；//例如，使用id为1的铲斗
Bucket Bucket=bucketDao.queryForEq（“id”，bucketId））；//查询此桶
List milkList=milkDao.queryForEq（“bucket_id”，bucketId）；//查询当前存储桶具有外键的所有牛奶
List breadList=breadDao.queryForEq（“bucket_id”，bucketId）；//面包也一样
//最后把牛奶和面包放在桶里收集好
List goodList=new ArrayList（）；
goodList.addAll（milkList）；
goodList.addAll（面包列表）；
桶装货物（货物清单）；