Looking for an HQL builder (Hibernate Query Language)

Question

I\'m looking for a builder for HQL in Java. I want to get rid of things like:

StringBuilder builder = new StringBuilder()
    .append(\"select stock from \")
            


        

Answer 1

I wrote a GPL'd solution for OMERO which you could easily build suited to your situation.

• Source: QueryBuilder.java
• Test: QueryBuilderMockTest

Usage:

QueryBuilder qb = new QueryBuilder();
qb.select("img");
qb.from("Image", "img");
qb.join("img.pixels", "pix", true, false);

// Can't join anymore after this
qb.where(); // First
qb.append("(");
qb.and("pt.details.creationTime > :time");
qb.param("time", new Date());
qb.append(")");
qb.and("img.id in (:ids)");
qb.paramList("ids", new HashSet());
qb.order("img.id", true);
qb.order("this.details.creationEvent.time", false);

It functions as a state machine "select->from->join->where->order", etc. and keeps up with optional parameters. There were several queries which the Criteria API could not perform (see HHH-879), so in the end it was simpler to write this small class to wrap StringBuilder. (Note: there is a ticket HHH-2407 describing a Hibernate branch which should unify the two. After that, it would probably make sense to re-visit the Criteria API)