等于：criteriaBuilder.equal
Predicate countryPredicate = criteriaBuilder.equal(root.get(“name”), “小明”);
and 和 or 查询
criteriaBuilder.and(predicates.toArray(Predicate对象,Predicate对象)
criteriaBuilder.or(predicates.toArray(Predicate对象,Predicate对象))
大于：criteriaBuilder.greaterThan
criteriaBuilder.greaterThan(root.get(“name”), 3);
小于：criteriaBuilder.lessThan
大于等于：criteriaBuilder.greaterThanOrEqualTo
小于等于：criteriaBuilder.lessThanOrEqualTo
相似查询：criteriaBuilder.like
Specification spec = (Specification) (root, criteriaQuery, criteriaBuilder) -> {
Predicate p = criteriaBuilder.like(root.get(“name”), “%” + “小明” + “%”);
return p;
};