How to dynamically generate SQL query based on user’s selections?

Question

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How to dynamically generate SQL query based on user's selections?

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Answer 1

If you want to do this in JPA 1.X, you can use custom query builder as described here http://rrusin.blogspot.com/2010/02/jpa-query-builder.html. This enables creating queries like this:

return new JpaQueryBuilder().buildQuery(em,
                new Object[] {
                    "select c from Car c where c.name is not null",
                    new JQBParam("name", name, " and c.name = :name"),
                    new JQBParam("type", type, " and c.type = :type")
                }
            )