BAEL-2806 (#6591)

* BAEL-2806 Article companion code. * BAEL-2806-Rev1 Added integration tests, improved examples and fixed an error.
2019-03-31 10:48:49 -04:00
parent 1c82623201
commit 0b9a5b3d04
5 changed files with 216 additions and 19 deletions
@@ -0,0 +1,69 @@
+package com.baeldung.jpa.querytypes;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import javax.persistence.EntityManager;
+import javax.persistence.EntityManagerFactory;
+import javax.persistence.Persistence;
+import javax.persistence.Query;
+import javax.persistence.TypedQuery;
+import javax.persistence.criteria.CriteriaBuilder;
+import javax.persistence.criteria.CriteriaQuery;
+import javax.persistence.criteria.Root;
+
+/**
+ * JPA Query Types examples. All using the UserEntity class.
+ *
+ * @author Rodolfo Felipe
+ */
+public class QueryTypesExamples {
+
+    EntityManagerFactory emf;
+
+    public QueryTypesExamples() {
+        Map properties = new HashMap();
+        properties.put("hibernate.show_sql", "true");
+        properties.put("hibernate.format_sql", "true");
+        emf = Persistence.createEntityManagerFactory("jpa-query-types", properties);
+    }
+
+    private EntityManager getEntityManager() {
+        return emf.createEntityManager();
+    }
+
+    public UserEntity getUserByIdWithPlainQuery(Long id) {
+        Query jpqlQuery = getEntityManager().createQuery("SELECT u FROM UserEntity u WHERE u.id=:id");
+        jpqlQuery.setParameter("id", id);
+        return (UserEntity) jpqlQuery.getSingleResult();
+    }
+
+    public UserEntity getUserByIdWithTypedQuery(Long id) {
+        TypedQuery<UserEntity> typedQuery = getEntityManager().createQuery("SELECT u FROM UserEntity u WHERE u.id=:id", UserEntity.class);
+        typedQuery.setParameter("id", id);
+        return typedQuery.getSingleResult();
+    }
+
+    public UserEntity getUserByIdWithNamedQuery(Long id) {
+        Query namedQuery = getEntityManager().createNamedQuery("UserEntity.findByUserId");
+        namedQuery.setParameter("userId", id);
+        return (UserEntity) namedQuery.getSingleResult();
+    }
+
+    public UserEntity getUserByIdWithNativeQuery(Long id) {
+        Query nativeQuery = getEntityManager().createNativeQuery("SELECT * FROM users WHERE id=:userId", UserEntity.class);
+        nativeQuery.setParameter("userId", id);
+        return (UserEntity) nativeQuery.getSingleResult();
+    }
+
+    public UserEntity getUserByIdWithCriteriaQuery(Long id) {
+        CriteriaBuilder criteriaBuilder = getEntityManager().getCriteriaBuilder();
+        CriteriaQuery<UserEntity> criteriaQuery = criteriaBuilder.createQuery(UserEntity.class);
+        Root<UserEntity> userRoot = criteriaQuery.from(UserEntity.class);
+        UserEntity queryResult = getEntityManager().createQuery(criteriaQuery.select(userRoot)
+            .where(criteriaBuilder.equal(userRoot.get("id"), id)))
+            .getSingleResult();
+        return queryResult;
+    }
+
+}
@@ -0,0 +1,38 @@
+package com.baeldung.jpa.querytypes;
+
+import javax.persistence.Entity;
+import javax.persistence.Id;
+import javax.persistence.NamedQuery;
+import javax.persistence.Table;
+
+/**
+ * User entity class. Used as an asset for JPA Query Types examples.
+ *
+ * @author Rodolfo Felipe
+ */
+@Table(name = "users")
+@Entity
+@NamedQuery(name = "UserEntity.findByUserId", query = "SELECT u FROM UserEntity u WHERE u.id=:userId")
+public class UserEntity {
+
+    @Id
+    private Long id;
+    private String name;
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+}