如何配置Hibernate Search批量获取数据库行？

Question

I'm using Hibernate Search to implement a full text search. My database is SQL Server. Unfortunately, when my full text search retrieves too much documents, I face the limitation of SQL Server:

The incoming request has too many parameters. The server supports a maximum of 2100 parameters The incoming request has too many parameters. The server supports a maximum of 2100 parameters .

Indeed, after having found matching documents, Hibernate Search tries to load corresponding entities from the database, with a single query and a too big IN clause.

So my question is, is it possible to configure Hibernate Search to fetch entities in batches from the database?

Answer 1

You'd probably want to check the fetch size from loading options which allow you to set how many entities are loaded in a single trip to DB, something like:

SearchResult<Book> result = searchSession.search( Book.class ) 
        .where( f -> f.match()
                .field( "title" )
                .matching( "robot" ) )
        .loading( o -> o.fetchSize( 50 ) ) 
        .fetch( 200 ); 

Also, if you expect to work with large result sets, you might want to check the scrolling instead.