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Does hibernate convert column != null in HQL to a column is null in SQL?
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You have to use is null and is not null in HQL.
Is not null determines if the object/record being inspected is a true null value or not (no data). <> '' means is not an empty string, so the record does contain data (that there is an empty string) and is not actually null. So a query with is not null will return records with a value of string.
The @NotNull annotation triggers a validation by the BeanValidation implementation when a pre-update or a pre-persist lifecycle event gets triggered. So, the validation happens within your Java application. Hibernate doesn't perform any validation if you annotate an attribute with @Column(nullable = false).
NVL Function - PL/HQL Reference NVL function returns first non-NULL expression.
That is a binary operator in hibernate you should use
is not null Have a look at 14.10. Expressions
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