Hibernate标准在限制内部使用别名

Question

I have two classes where second class is property of first one. For example

Payout

class Payout{

int id;

Batch batch;

}

Batch

class Batch{

int id;

Date closedDate;

}

I want to fetch payouts with batch is null or batch.closedDate is null ;

I wrote

Criteria criteria = session.createCriteria(Payout.class, "payout")
.add(or(isNull("payout.batch"), and(isNotNull("payout.batch"), isNull("payout.batch.closedDate"))));

Here it doesn't work as there is no joining, but if I create alias on the top for batch then criteria is filtering only if payout has batch. How can I write criteria without alias for property but filter with property's property?

Answer 1

After reading for some time I found the solution. Criteria criteria = session.createCriteria(Payout.class) .createAlias(Payout_.batch.getName(), "b", JoinType.LEFT_OUTER_JOIN) .add(or(isNull(Payout_.batch.getName()), isNull("b." + Batch_.closed.getName()))); As I told in the question normal join is default in createAlias function and it takes payouts that has batch. But with JoinType.LEFT_OUTER_JOIN it looks for only batch that's id is equal to payout.batch.id if it exits.