JPA Criteria API: how to express literal true and literal false?

jpa criteria-api
Abdull picture Abdull · Feb 3, 2013 · Viewed 18.9k times · Source

How can I express literal true and literal false in JPA's Criteria API?

I'm looking for something like Predicate alwaysTrue = CriterialBuilder.DefaultLiterals.TRUE (analogous to java.lang.Boolean.TRUE).

Answer

JB Nizet picture JB Nizet · Feb 3, 2013

To get an always true Predicate instance, use criteriaBuilder.and().
To get an always false Predicate instance, use criteriaBuilder.or().

Related questions

JPA 2.0, Criteria API, Subqueries, In Expressions

I have tried to write a query statement with a subquery and an IN expression for many times. But I have never succeeded. I always get the exception, " Syntax error near keyword 'IN' ", the query statement was build like this, …

Read More
JPA CriteriaBuilder - How to use "IN" comparison operator

Can you please help me how to convert the following codes to using "in" operator of criteria builder? I need to filter by using list/array of usernames using "in". I also tried to search using JPA CriteriaBuilder - "in" …

Read More
JPA & Criteria API - Select only specific columns

I would like to select only specific columns (ex. SELECT a FROM b). I have a generic DAO and what I came up with is: public List<T> getAll(boolean idAndVersionOnly) { CriteriaBuilder builder = manager.getCriteriaBuilder(); CriteriaQuery<T&…

Read More