How to Use a Collection as a Named Parameter in Hibernate HQL Queries?

How can I set a collection as a named parameter in a Hibernate HQL query?

FROM Foo WHERE Id = :id AND Bar IN (:barList)

Setting a collection as a named parameter in a Hibernate HQL query can be done using the `setParameterList` method. This method allows you to bind a list of values to a named parameter in your query, enabling you to use collections effectively in your queries.

List<Integer> barList = Arrays.asList(1, 2, 3);
Query query = session.createQuery("FROM Foo WHERE Id = :id AND Bar IN (:barList)");
query.setInteger("id", targetId);
query.setParameterList("barList", barList);

Causes

• Confusion about which method to use for setting collection parameters in HQL queries.
• Lack of understanding of the difference between single and multiple parameter binding.

Solutions

• Use the `setParameterList(String name, Collection values)` method on your Query object to bind a collection of values to your named parameter.
• Ensure that the parameter in the HQL matches the type of collection you are passing.

Mistake: Using `setParameter` instead of `setParameterList` when binding a collection.

Solution: Always use `setParameterList` when you need to bind a collection to a named parameter.

Mistake: Not ensuring the correct data type for the items in the collection.

Solution: Verify that the collection data type matches what is expected in the HQL definition.