Hibernate Fetching Update (#607)
* BAEL-212 Contains: 1. Hibernate Criteria Query Classes 2. Hibernate Criteria Query Test * Updating the config file and the HibernateUtil class * Hibernate Criteria Queries Example * Hibernate Fetching : Eager Loading vs Lazy Loading * Hibernate Criteria Query files * Hibernate Eager Loading and Lazy Loading Changes * Latest Changes on Fetching * Fetching Changes * Latest Changes * Latest Changes * Undoing the changes
This commit is contained in:
PRITAM BANERJEE
Grzegorz Piwowarek
parent
fe16518c17
commit
6c062ca19e
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@ -206,4 +206,4 @@ public class CompletableFutureTest {
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}
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}
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}
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@ -3,80 +3,71 @@ package com.baeldung.hibernate.fetching.model;
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import java.io.Serializable;
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import java.sql.Date;
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public class OrderDetail implements Serializable {
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private static final long serialVersionUID = 1L;
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private Long orderId;
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private Date orderDate;
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private String orderDesc;
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private User user;
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public OrderDetail() {
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}
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public OrderDetail(Date orderDate, String orderDesc) {
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super();
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this.orderDate = orderDate;
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this.orderDesc = orderDesc;
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}
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public Date getOrderDate() {
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return orderDate;
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}
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public void setOrderDate(Date orderDate) {
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this.orderDate = orderDate;
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}
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public String getOrderDesc() {
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return orderDesc;
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}
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public void setOrderDesc(String orderDesc) {
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this.orderDesc = orderDesc;
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}
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public User getUser() {
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return user;
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}
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public void setUser(User user) {
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this.user = user;
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}
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@Override
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public int hashCode() {
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final int prime = 31;
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int result = 1;
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result = prime * result + ((orderId == null) ? 0 : orderId.hashCode());
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return result;
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}
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@Override
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public boolean equals(Object obj) {
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if (this == obj)
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return true;
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if (obj == null)
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return false;
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if (getClass() != obj.getClass())
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return false;
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OrderDetail other = (OrderDetail) obj;
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if (orderId == null) {
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if (other.orderId != null)
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return false;
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} else if (!orderId.equals(other.orderId))
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return false;
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return true;
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}
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public Long getOrderId() {
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return orderId;
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}
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public void setOrderId(Long orderId) {
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this.orderId = orderId;
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}
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public class OrderDetail implements Serializable{
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private static final long serialVersionUID = 1L;
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private Long orderId;
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private Date orderDate;
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private String orderDesc;
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private User user;
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public OrderDetail(){
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}
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public OrderDetail(Date orderDate, String orderDesc) {
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super();
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this.orderDate = orderDate;
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this.orderDesc = orderDesc;
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}
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public Date getOrderDate() {
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return orderDate;
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}
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public void setOrderDate(Date orderDate) {
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this.orderDate = orderDate;
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}
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public String getOrderDesc() {
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return orderDesc;
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}
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public void setOrderDesc(String orderDesc) {
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this.orderDesc = orderDesc;
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}
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public User getUser() {
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return user;
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}
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public void setUser(User user) {
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this.user = user;
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}
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@Override
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public int hashCode() {
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final int prime = 31;
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int result = 1;
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result = prime * result + ((orderId == null) ? 0 : orderId.hashCode());
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return result;
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}
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@Override
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public boolean equals(Object obj) {
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if (this == obj)
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return true;
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if (obj == null)
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return false;
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if (getClass() != obj.getClass())
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return false;
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OrderDetail other = (OrderDetail) obj;
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if (orderId == null) {
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if (other.orderId != null)
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return false;
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} else if (!orderId.equals(other.orderId))
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return false;
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return true;
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}
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public Long getOrderId() {
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return orderId;
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}
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public void setOrderId(Long orderId) {
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this.orderId = orderId;
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}
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}
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@ -17,12 +17,11 @@ public class User implements Serializable {
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}
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public User(final Long userId, final String userName, final String firstName, final String lastName) {
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super();
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this.userId = userId;
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this.userName = userName;
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this.firstName = firstName;
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this.lastName = lastName;
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super();
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this.userId = userId;
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this.userName = userName;
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this.firstName = firstName;
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this.lastName = lastName;
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}
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@Override
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@ -1,24 +1,27 @@
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package com.baeldung.hibernate.fetching.util;
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import org.hibernate.Session;
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import org.hibernate.SessionFactory;
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import org.hibernate.cfg.Configuration;
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public class HibernateUtil {
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@SuppressWarnings("deprecation")
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public static Session getHibernateSession(String fetchMethod) {
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//two config files are there
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//one with lazy loading enabled
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//another lazy = false
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final String configFileName = "lazy".equals(fetchMethod) ?
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"fetchingLazy.cfg.xml" :
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"fetching.cfg.xml";
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return new Configuration()
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.configure(configFileName)
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.buildSessionFactory().openSession();
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}
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@SuppressWarnings("deprecation")
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public static Session getHibernateSession(String fetchMethod) {
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//two config files are there
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//one with lazy loading enabled
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//another lazy = false
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SessionFactory sf = null;
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if ("lazy".equals(fetchMethod)) {
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sf = new Configuration().configure("fetchingLazy.cfg.xml").buildSessionFactory();
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} else {
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sf = new Configuration().configure("fetching.cfg.xml").buildSessionFactory();
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}
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// fetching.cfg.xml is used for this example
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final Session session = sf.openSession();
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return session;
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}
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public static Session getHibernateSession() {
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return new Configuration()
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@ -18,93 +18,94 @@ import com.baeldung.hibernate.fetching.model.User;
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public class FetchingAppView {
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public FetchingAppView() {
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public FetchingAppView(){
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}
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//lazily loaded
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public Set<OrderDetail> lazyLoaded(){
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final Session sessionLazy = HibernateUtil.getHibernateSession("lazy");
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List<User> users = sessionLazy.createQuery("From User").list();
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User userLazyLoaded = new User();
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userLazyLoaded = users.get(3);
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//since data is lazyloaded so data won't be initialized
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Set<OrderDetail> orderDetailSet = userLazyLoaded.getOrderDetail();
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return (orderDetailSet);
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}
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//eagerly loaded
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public Set<OrderDetail> eagerLoaded(){
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final Session sessionEager = HibernateUtil.getHibernateSession();
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//data should be loaded in the following line
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//also note the queries generated
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List<User> users =sessionEager.createQuery("From User").list();
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User userEagerLoaded = new User();
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userEagerLoaded = users.get(3);
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Set<OrderDetail> orderDetailSet = userEagerLoaded.getOrderDetail();
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return orderDetailSet;
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}
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//creates test data
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//call this method to create the data in the database
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public void createTestData() {
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}
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final Session session = HibernateUtil.getHibernateSession();
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Transaction tx = null;
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tx = session.beginTransaction();
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final User user1 = new User();
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final User user2 = new User();
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final User user3 = new User();
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user1.setFirstName("Priyam");
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user1.setLastName("Banerjee");
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user1.setUserName("priyambanerjee");
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session.save(user1);
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user2.setFirstName("Navneeta");
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user2.setLastName("Mukherjee");
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user2.setUserName("nmukh");
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session.save(user2);
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user3.setFirstName("Molly");
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user3.setLastName("Banerjee");
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user3.setUserName("mollyb");
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session.save(user3);
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public boolean lazyLoaded() {
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final Session sessionLazy = HibernateUtil.getHibernateSession("lazy");
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List<User> users = sessionLazy.createQuery("From User").list();
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User userLazyLoaded = users.get(3);
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//since data is lazyloaded so data won't be initialized
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Set<OrderDetail> orderDetailSet = userLazyLoaded.getOrderDetail();
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final OrderDetail order1 = new OrderDetail();
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final OrderDetail order2 = new OrderDetail();
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final OrderDetail order3 = new OrderDetail();
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final OrderDetail order4 = new OrderDetail();
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final OrderDetail order5 = new OrderDetail();
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return (Hibernate.isInitialized(orderDetailSet));
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}
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order1.setOrderDesc("First Order");
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order1.setOrderDate(new Date(2014, 10, 12));
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order1.setUser(user1);
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order2.setOrderDesc("Second Order");
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order2.setOrderDate(new Date(2016, 10, 25));
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order2.setUser(user1);
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order3.setOrderDesc("Third Order");
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order3.setOrderDate(new Date(2015, 2, 17));
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order3.setUser(user2);
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order4.setOrderDesc("Fourth Order");
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order4.setOrderDate(new Date(2014, 10, 1));
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order4.setUser(user2);
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order5.setOrderDesc("Fifth Order");
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order5.setOrderDate(new Date(2014, 9, 11));
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order5.setUser(user3);
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session.saveOrUpdate(order1);
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session.saveOrUpdate(order2);
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session.saveOrUpdate(order3);
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session.saveOrUpdate(order4);
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session.saveOrUpdate(order5);
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public boolean eagerLoaded() {
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final Session sessionEager = HibernateUtil.getHibernateSession();
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//data should be loaded in the following line
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//also note the queries generated
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List<User> users = sessionEager.createQuery("From User").list();
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User userEagerLoaded = users.get(3);
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Set<OrderDetail> orderDetailSet = userEagerLoaded.getOrderDetail();
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tx.commit();
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session.close();
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return (Hibernate.isInitialized(orderDetailSet));
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}
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//creates test data
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//call this method to create the data in the database
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public void createTestData() {
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final Session session = HibernateUtil.getHibernateSession();
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Transaction tx = session.beginTransaction();
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final User user1 = new User();
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final User user2 = new User();
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final User user3 = new User();
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user1.setFirstName("Priyam");
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user1.setLastName("Banerjee");
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user1.setUserName("priyambanerjee");
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session.save(user1);
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user2.setFirstName("Navneeta");
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user2.setLastName("Mukherjee");
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user2.setUserName("nmukh");
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session.save(user2);
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user3.setFirstName("Molly");
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user3.setLastName("Banerjee");
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user3.setUserName("mollyb");
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session.save(user3);
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final OrderDetail order1 = new OrderDetail();
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final OrderDetail order2 = new OrderDetail();
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final OrderDetail order3 = new OrderDetail();
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final OrderDetail order4 = new OrderDetail();
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final OrderDetail order5 = new OrderDetail();
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order1.setOrderDesc("First Order");
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order1.setOrderDate(new Date(2014, 10, 12));
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order1.setUser(user1);
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order2.setOrderDesc("Second Order");
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order2.setOrderDate(new Date(2016, 10, 25));
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order2.setUser(user1);
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order3.setOrderDesc("Third Order");
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order3.setOrderDate(new Date(2015, 2, 17));
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order3.setUser(user2);
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order4.setOrderDesc("Fourth Order");
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order4.setOrderDate(new Date(2014, 10, 1));
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order4.setUser(user2);
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order5.setOrderDesc("Fifth Order");
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order5.setOrderDate(new Date(2014, 9, 11));
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order5.setUser(user3);
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session.saveOrUpdate(order1);
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session.saveOrUpdate(order2);
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session.saveOrUpdate(order3);
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session.saveOrUpdate(order4);
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session.saveOrUpdate(order5);
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// session.saveOrUpdate(user1);
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tx.commit();
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session.close();
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}
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}
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}
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@ -1,24 +1,43 @@
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package com.baeldung.hibernate.fetching;
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import static org.junit.Assert.*;
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import java.util.Set;
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import org.hibernate.Hibernate;
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import org.junit.Before;
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import org.junit.Test;
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import com.baeldung.hibernate.fetching.model.OrderDetail;
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import com.baeldung.hibernate.fetching.view.FetchingAppView;
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public class HibernateFetchingTest {
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//this loads sample data in the database
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@Before
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public void addFecthingTestData(){
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FetchingAppView fav = new FetchingAppView();
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fav.createTestData();
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}
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//testLazyFetching() tests the lazy loading
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//Since it lazily loaded so orderDetalSetLazy won't
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//be initialized
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@Test
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public void testLazyFetching() {
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FetchingAppView fav = new FetchingAppView();
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fav.createTestData();
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assertFalse(fav.lazyLoaded());
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Set<OrderDetail> orderDetalSetLazy = fav.lazyLoaded();
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assertFalse(Hibernate.isInitialized(orderDetalSetLazy));
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}
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//testEagerFetching() tests the eager loading
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//Since it eagerly loaded so orderDetalSetLazy would
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//be initialized
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@Test
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public void testEagerFetching() {
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FetchingAppView fav = new FetchingAppView();
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assertTrue(fav.eagerLoaded());
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Set<OrderDetail> orderDetalSetEager = fav.eagerLoaded();
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assertTrue(Hibernate.isInitialized(orderDetalSetEager));
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}
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}
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