如何在JPA中对结果查询进行分页？

Question

I am trying to implement a pagination functionality with JPA but I am having trouble.

I can get and set the first and last numbers on the link eg localhost:8000/?first=11&last=20.

As you can see, I am trying to get the items starting at row 11 and ending at row 20, however, I am getting all the results starting from first but with a total amount of last eg starting at 10 but with 20 results as opposed to the desired 10.

I am using:

query.setFirstResult(firstRowNumber - 1).setMaxResults(lastRowNumber);

How do I therefore limit my results?

Answer 1

You want this:

query
  .setFirstResult(firstRowNumber - 1)
  .setMaxResults(lastRowNumber - firstRowNumber + 1);

Notice that the method is named setMaxResults() (total number), not setLastResult() . Have a look at awesome spring-data-jpa which handles paging very nicely.