fix boot 2 upgrade, rename package

spring-rest-query-language/src/main/java/com/baeldung/persistence/dao/UserDAO.java

@@ -0,0 +1,43 @@
+package com.baeldung.persistence.dao;
+
+import java.util.List;
+
+import javax.persistence.EntityManager;
+import javax.persistence.PersistenceContext;
+import javax.persistence.criteria.CriteriaBuilder;
+import javax.persistence.criteria.CriteriaQuery;
+import javax.persistence.criteria.Predicate;
+import javax.persistence.criteria.Root;
+
+import org.springframework.stereotype.Repository;
+
+import com.baeldung.persistence.model.User;
+import com.baeldung.web.util.SearchCriteria;
+
+@Repository
+public class UserDAO implements IUserDAO {
+
+    @PersistenceContext
+    private EntityManager entityManager;
+
+    @Override
+    public List<User> searchUser(final List<SearchCriteria> params) {
+        final CriteriaBuilder builder = entityManager.getCriteriaBuilder();
+        final CriteriaQuery<User> query = builder.createQuery(User.class);
+        final Root r = query.from(User.class);
+
+        Predicate predicate = builder.conjunction();
+        UserSearchQueryCriteriaConsumer searchConsumer = new UserSearchQueryCriteriaConsumer(predicate, builder, r);
+        params.stream().forEach(searchConsumer);
+        predicate = searchConsumer.getPredicate();
+        query.where(predicate);
+
+        return entityManager.createQuery(query).getResultList();
+    }
+
+    @Override
+    public void save(final User entity) {
+        entityManager.persist(entity);
+    }
+
+}