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Annotation Based Fetching (#617) 

* 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

* Annotation based changes on Hibernate Fetching
This commit is contained in:
PRITAM BANERJEE 2016-08-18 01:46:05 -07:00 committed by Grzegorz Piwowarek
parent 9c7ef6c5f3
commit b47d6543f2
15 changed files with 340 additions and 292 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

78
spring-hibernate4/src/main/java/com/baeldung/hibernate/fetching/model/OrderDetailEager.java Normal file
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@ -0,0 +1,78 @@
package com.baeldung.hibernate.fetching.model;
import java.io.Serializable;
import java.sql.Date;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.Table;
@Entity
@Table (name = "USER_ORDER")
public class OrderDetailEager implements Serializable{
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue
@Column(name="ORDER_ID")
private Long orderId;
@ManyToOne(fetch = FetchType.EAGER)
@JoinColumn(name="USER_ID")
private UserEager user;
public OrderDetailEager(){
}
public OrderDetailEager(Date orderDate, String orderDesc) {
super();
}
public UserEager getUser() {
return user;
}
public void setUser(UserEager user) {
this.user = user;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((orderId == null) ? 0 : orderId.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
OrderDetailEager other = ( OrderDetailEager) obj;
if (orderId == null) {
if (other.orderId != null)
return false;
} else if (!orderId.equals(other.orderId))
return false;
return true;
}
public Long getOrderId() {
return orderId;
}
public void setOrderId(Long orderId) {
this.orderId = orderId;
}
}

55
spring-hibernate4/src/main/java/com/baeldung/hibernate/fetching/model/OrderDetail.java → spring-hibernate4/src/main/java/com/baeldung/hibernate/fetching/model/OrderDetailLazy.java
View File

@ -3,41 +3,45 @@ package com.baeldung.hibernate.fetching.model;
import java.io.Serializable;
import java.sql.Date;
public class OrderDetail implements Serializable{
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.Table;
@Entity
@Table (name = "USER_ORDER")
public class OrderDetailLazy implements Serializable{
private static final long serialVersionUID = 1L;
private Long orderId;
private Date orderDate;
private String orderDesc;
private User user;
public OrderDetail(){
@Id
@GeneratedValue
@Column(name="ORDER_ID")
private Long orderId;
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name="USER_ID")
private UserLazy user;
public OrderDetailLazy(){
}
public OrderDetail(Date orderDate, String orderDesc) {
super();
this.orderDate = orderDate;
this.orderDesc = orderDesc;
public OrderDetailLazy(Date orderDate, String orderDesc) {
super();
}
public Date getOrderDate() {
return orderDate;
}
public void setOrderDate(Date orderDate) {
this.orderDate = orderDate;
}
public String getOrderDesc() {
return orderDesc;
}
public void setOrderDesc(String orderDesc) {
this.orderDesc = orderDesc;
}
public User getUser() {
public UserLazy getUser() {
return user;
}
public void setUser(User user) {
public void setUser(UserLazy user) {
this.user = user;
}
@Override
public int hashCode() {
final int prime = 31;
@ -53,7 +57,7 @@ public class OrderDetail implements Serializable{
return false;
if (getClass() != obj.getClass())
return false;
OrderDetail other = (OrderDetail) obj;
OrderDetailLazy other = (OrderDetailLazy) obj;
if (orderId == null) {
if (other.orderId != null)
return false;
@ -62,6 +66,7 @@ public class OrderDetail implements Serializable{
return true;
}
public Long getOrderId() {
return orderId;
}

93
spring-hibernate4/src/main/java/com/baeldung/hibernate/fetching/model/User.java
View File

@ -1,93 +0,0 @@
package com.baeldung.hibernate.fetching.model;
import java.io.Serializable;
import java.util.HashSet;
import java.util.Set;
public class User implements Serializable {
private static final long serialVersionUID = 1L;
private Long userId;
private String userName;
private String firstName;
private String lastName;
private Set<OrderDetail> orderDetail = new HashSet<OrderDetail>();
public User() {
}
public User(final Long userId, final String userName, final String firstName, final String lastName) {
super();
this.userId = userId;
this.userName = userName;
this.firstName = firstName;
this.lastName = lastName;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((userId == null) ? 0 : userId.hashCode());
return result;
}
@Override
public boolean equals(final Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
final User other = (User) obj;
if (userId == null) {
if (other.userId != null)
return false;
} else if (!userId.equals(other.userId))
return false;
return true;
}
public Long getUserId() {
return userId;
}
public void setUserId(final Long userId) {
this.userId = userId;
}
public String getUserName() {
return userName;
}
public void setUserName(final String userName) {
this.userName = userName;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(final String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(final String lastName) {
this.lastName = lastName;
}
public Set<OrderDetail> getOrderDetail() {
return orderDetail;
}
public void setOrderDetail(Set<OrderDetail> orderDetail) {
this.orderDetail = orderDetail;
}
}

87
spring-hibernate4/src/main/java/com/baeldung/hibernate/fetching/model/UserEager.java Normal file
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@ -0,0 +1,87 @@
package com.baeldung.hibernate.fetching.model;
import java.io.Serializable;
import java.util.HashSet;
import java.util.Set;
import javax.persistence.Entity;
import javax.persistence.Table;
import javax.persistence.UniqueConstraint;
import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.EntityListeners;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.NamedQuery;
import javax.persistence.OneToMany;
import javax.persistence.PrePersist;
import javax.persistence.PreRemove;
import javax.persistence.PreUpdate;
@Entity
@Table (name = "USER")
public class UserEager implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue
@Column(name="USER_ID")
private Long userId;
@OneToMany(fetch = FetchType.EAGER, mappedBy = "user")
private Set<OrderDetailEager> orderDetail = new HashSet();
public UserEager() {
}
public UserEager(final Long userId) {
super();
this.userId = userId;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((userId == null) ? 0 : userId.hashCode());
return result;
}
@Override
public boolean equals(final Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
final UserEager other = (UserEager) obj;
if (userId == null) {
if (other.userId != null)
return false;
} else if (!userId.equals(other.userId))
return false;
return true;
}
public Long getUserId() {
return userId;
}
public void setUserId(final Long userId) {
this.userId = userId;
}
public Set<OrderDetailEager> getOrderDetail() {
return orderDetail;
}
public void setOrderDetail(Set<OrderDetailEager> orderDetail) {
this.orderDetail = orderDetail;
}
}

88
spring-hibernate4/src/main/java/com/baeldung/hibernate/fetching/model/UserLazy.java Normal file
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@ -0,0 +1,88 @@
package com.baeldung.hibernate.fetching.model;
import java.io.Serializable;
import java.util.HashSet;
import java.util.Set;
import javax.persistence.Entity;
import javax.persistence.Table;
import javax.persistence.UniqueConstraint;
import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.EntityListeners;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.NamedQuery;
import javax.persistence.OneToMany;
import javax.persistence.PrePersist;
import javax.persistence.PreRemove;
import javax.persistence.PreUpdate;
@Entity
@Table (name = "USER")
public class UserLazy implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue
@Column(name="USER_ID")
private Long userId;
@OneToMany(fetch = FetchType.LAZY, mappedBy = "user")
private Set<OrderDetailLazy> orderDetail = new HashSet();
public UserLazy() {
}
public UserLazy(final Long userId) {
super();
this.userId = userId;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((userId == null) ? 0 : userId.hashCode());
return result;
}
@Override
public boolean equals(final Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
final UserLazy other = (UserLazy) obj;
if (userId == null) {
if (other.userId != null)
return false;
} else if (!userId.equals(other.userId))
return false;
return true;
}
public Long getUserId() {
return userId;
}
public void setUserId(final Long userId) {
this.userId = userId;
}
public Set<OrderDetailLazy> getOrderDetail() {
return orderDetail;
}
public void setOrderDetail(Set<OrderDetailLazy> orderDetail) {
this.orderDetail = orderDetail;
}
}

107
spring-hibernate4/src/main/java/com/baeldung/hibernate/fetching/view/FetchingAppView.java
View File

@ -1,103 +1,74 @@
package com.baeldung.hibernate.fetching.view;
import java.sql.Date;
import java.util.List;
import java.util.Set;
import org.hibernate.Hibernate;
import org.hibernate.Session;
import org.hibernate.Transaction;
import com.baeldung.hibernate.fetching.util.HibernateUtil;
import com.baeldung.hibernate.fetching.model.OrderDetailEager;
import com.baeldung.hibernate.fetching.model.OrderDetailLazy;
import com.baeldung.hibernate.fetching.model.OrderDetail;
import com.baeldung.hibernate.fetching.model.User;
import com.baeldung.hibernate.fetching.model.UserLazy;
import com.baeldung.hibernate.fetching.model.UserEager;
public class FetchingAppView {
public FetchingAppView(){
public FetchingAppView() {
}
//lazily loaded
public Set<OrderDetail> lazyLoaded(){
// lazily loaded
public Set<OrderDetailLazy> lazyLoaded() {
final Session sessionLazy = HibernateUtil.getHibernateSession("lazy");
List<User> users = sessionLazy.createQuery("From User").list();
User userLazyLoaded = new User();
userLazyLoaded = users.get(3);
//since data is lazyloaded so data won't be initialized
Set<OrderDetail> orderDetailSet = userLazyLoaded.getOrderDetail();
return (orderDetailSet);
List<UserLazy> users = sessionLazy.createQuery("From UserLazy").list();
UserLazy userLazyLoaded = new UserLazy();
userLazyLoaded = users.get(3);
// since data is lazyloaded so data won't be initialized
Set<OrderDetailLazy> orderDetailSet = userLazyLoaded.getOrderDetail();
return (orderDetailSet);
}
//eagerly loaded
public Set<OrderDetail> eagerLoaded(){
// eagerly loaded
public Set<OrderDetailEager> eagerLoaded() {
final Session sessionEager = HibernateUtil.getHibernateSession();
//data should be loaded in the following line
//also note the queries generated
List<User> users =sessionEager.createQuery("From User").list();
User userEagerLoaded = new User();
userEagerLoaded = users.get(3);
Set<OrderDetail> orderDetailSet = userEagerLoaded.getOrderDetail();
return orderDetailSet;
// data should be loaded in the following line
// also note the queries generated
List<UserEager> user = sessionEager.createQuery("From UserEager").list();
UserEager userEagerLoaded = new UserEager();
userEagerLoaded = user.get(3);
Set<OrderDetailEager> orderDetailSet = userEagerLoaded.getOrderDetail();
return orderDetailSet;
}
//creates test data
//call this method to create the data in the database
// creates test data
// call this method to create the data in the database
public void createTestData() {
final Session session = HibernateUtil.getHibernateSession();
final Session session = HibernateUtil.getHibernateSession("lazy");
Transaction tx = null;
tx = session.beginTransaction();
final User user1 = new User();
final User user2 = new User();
final User user3 = new User();
user1.setFirstName("Priyam");
user1.setLastName("Banerjee");
user1.setUserName("priyambanerjee");
final UserLazy user1 = new UserLazy();
final UserLazy user2 = new UserLazy();
final UserLazy user3 = new UserLazy();
session.save(user1);
user2.setFirstName("Navneeta");
user2.setLastName("Mukherjee");
user2.setUserName("nmukh");
session.save(user2);
user3.setFirstName("Molly");
user3.setLastName("Banerjee");
user3.setUserName("mollyb");
session.save(user3);
final OrderDetail order1 = new OrderDetail();
final OrderDetail order2 = new OrderDetail();
final OrderDetail order3 = new OrderDetail();
final OrderDetail order4 = new OrderDetail();
final OrderDetail order5 = new OrderDetail();
final OrderDetailLazy order1 = new OrderDetailLazy();
final OrderDetailLazy order2 = new OrderDetailLazy();
final OrderDetailLazy order3 = new OrderDetailLazy();
final OrderDetailLazy order4 = new OrderDetailLazy();
final OrderDetailLazy order5 = new OrderDetailLazy();
order1.setOrderDesc("First Order");
order1.setOrderDate(new Date(2014, 10, 12));
order1.setUser(user1);
order2.setOrderDesc("Second Order");
order2.setOrderDate(new Date(2016, 10, 25));
order2.setUser(user1);
order3.setOrderDesc("Third Order");
order3.setOrderDate(new Date(2015, 2, 17));
order3.setUser(user2);
order4.setOrderDesc("Fourth Order");
order4.setOrderDate(new Date(2014, 10, 1));
order4.setUser(user2);
order5.setOrderDesc("Fifth Order");
order5.setOrderDate(new Date(2014, 9, 11));
order5.setUser(user3);
session.saveOrUpdate(order1);
session.saveOrUpdate(order2);
session.saveOrUpdate(order3);

7
spring-hibernate4/src/main/resources/fetching.cfg.xml
View File

@ -11,7 +11,10 @@
<property name="hibernate.connection.password">iamtheking</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="show_sql">true</property>
<mapping resource="com/baeldung/hibernate/fetching/model/User.hbm.xml" />
<mapping resource="com/baeldung/hibernate/fetching/model/OrderDetail.hbm.xml" />
<property name="hbm2ddl.auto">validate</property>
<mapping class="com.baeldung.hibernate.fetching.model.UserEager" />
<mapping class="com.baeldung.hibernate.fetching.model.OrderDetailEager" />
</session-factory>
</hibernate-configuration>

4
spring-hibernate4/src/main/resources/fetchingLazy.cfg.xml
View File

@ -11,7 +11,7 @@
<property name="hibernate.connection.password">iamtheking</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="show_sql">true</property>
<mapping resource="com/baeldung/hibernate/fetching/model/OrderDetail.hbm.xml" />
<mapping resource="com/baeldung/hibernate/fetching/model/UserLazy.hbm.xml" />
<mapping class="com.baeldung.hibernate.fetching.model.UserLazy" />
<mapping class="com.baeldung.hibernate.fetching.model.OrderDetailLazy" />
</session-factory>
</hibernate-configuration>

5
spring-hibernate4/src/main/resources/fetching_create_queries.sql
View File

@ -1,17 +1,12 @@
CREATE TABLE `user` (
`user_id` int(10) NOT NULL AUTO_INCREMENT,
`USERNAME` varchar(100) DEFAULT NULL,
`FIRST_NAME` varchar(255) NOT NULL,
`LAST_NAME` varchar(255) NOT NULL,
PRIMARY KEY (`user_id`)
) ENGINE=InnoDB AUTO_INCREMENT=8 DEFAULT CHARSET=latin1 ;
CREATE TABLE `user_order` (
`ORDER_ID` int(10) NOT NULL AUTO_INCREMENT,
`ORDER_DATE` date DEFAULT NULL,
`USER_ID` int(10) NOT NULL DEFAULT '0',
`ORDER_DESC` varchar(1024) DEFAULT NULL,
PRIMARY KEY (`ORDER_ID`,`USER_ID`),
KEY `USER_ID` (`USER_ID`),
CONSTRAINT `user_order_ibfk_1` FOREIGN KEY (`USER_ID`) REFERENCES `USER` (`user_id`)

10
spring-hibernate4/src/test/java/com/baeldung/hibernate/fetching/HibernateFetchingTest.java
View File

@ -7,15 +7,15 @@ import org.hibernate.Hibernate;
import org.junit.Before;
import org.junit.Test;
import com.baeldung.hibernate.fetching.model.OrderDetail;
import com.baeldung.hibernate.fetching.model.OrderDetailEager;
import com.baeldung.hibernate.fetching.model.OrderDetailLazy;
import com.baeldung.hibernate.fetching.view.FetchingAppView;
public class HibernateFetchingTest {
//this loads sample data in the database
@Before
// @Before
public void addFecthingTestData(){
FetchingAppView fav = new FetchingAppView();
fav.createTestData();
@ -27,7 +27,7 @@ public class HibernateFetchingTest {
@Test
public void testLazyFetching() {
FetchingAppView fav = new FetchingAppView();
Set<OrderDetail> orderDetalSetLazy = fav.lazyLoaded();
Set<OrderDetailLazy> orderDetalSetLazy = fav.lazyLoaded();
assertFalse(Hibernate.isInitialized(orderDetalSetLazy));
}
@ -37,7 +37,7 @@ public class HibernateFetchingTest {
@Test
public void testEagerFetching() {
FetchingAppView fav = new FetchingAppView();
Set<OrderDetail> orderDetalSetEager = fav.eagerLoaded();
Set<OrderDetailEager> orderDetalSetEager = fav.eagerLoaded();
assertTrue(Hibernate.isInitialized(orderDetalSetEager));
}
}

26
spring-hibernate4/src/test/resources/com/baeldung/hibernate/fetching/model/OrderDetail.hbm.xml
View File

@ -1,26 +0,0 @@
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="com.baeldung.hibernate.fetching.model.OrderDetail" table="USER_ORDER">
<id name="orderId" type="java.lang.Long" column="ORDER_ID" >
<generator class="native" />
</id>
<property name="orderDate" type="date">
<column name="ORDER_DATE" />
</property>
<property name="orderDesc" type="string">
<column name="ORDER_DESC" not-null="true" />
</property>
<many-to-one name="user" class="com.baeldung.hibernate.fetching.model.User" fetch="select">
<column name="user_id" not-null="true" />
</many-to-one>
</class>
</hibernate-mapping>

31
spring-hibernate4/src/test/resources/com/baeldung/hibernate/fetching/model/User.hbm.xml
View File

@ -1,31 +0,0 @@
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="com.baeldung.hibernate.fetching.model.User" table="USER">
<id name="userId" type="long" unsaved-value="null">
<column name="USER_ID" />
<generator class="native" />
</id>
<property name="userName" type="string">
<column name="USERNAME" length="100" />
</property>
<property name="firstName" type="string">
<column name="FIRST_NAME" not-null="true" />
</property>
<property name="lastName" type="string">
<column name="LAST_NAME" not-null="true" />
</property>
<set name="orderDetail" table="USER_ORDER"
inverse="true" lazy="false" fetch="select">
<key>
<column name="USER_ID" not-null="true" />
</key>
<one-to-many class="com.baeldung.hibernate.fetching.model.OrderDetail" />
</set>
</class>
</hibernate-mapping>

31
spring-hibernate4/src/test/resources/com/baeldung/hibernate/fetching/model/UserLazy.hbm.xml
View File

@ -1,31 +0,0 @@
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="com.baeldung.hibernate.fetching.model.User" table="USER">
<id name="userId" type="long" unsaved-value="null">
<column name="USER_ID" />
<generator class="native" />
</id>
<property name="userName" type="string">
<column name="USERNAME" length="100" />
</property>
<property name="firstName" type="string">
<column name="FIRST_NAME" not-null="true" />
</property>
<property name="lastName" type="string">
<column name="LAST_NAME" not-null="true" />
</property>
<set name="orderDetail" table="USER_ORDER"
inverse="true" lazy="true" fetch="select">
<key>
<column name="USER_ID" not-null="true" />
</key>
<one-to-many class="com.baeldung.hibernate.fetching.model.OrderDetail" />
</set>
</class>
</hibernate-mapping>

5
spring-hibernate4/src/test/resources/fetching.cfg.xml
View File

@ -11,7 +11,8 @@
<property name="hibernate.connection.password">iamtheking</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="show_sql">true</property>
<mapping resource="com/baeldung/hibernate/fetching/model/User.hbm.xml" />
<mapping resource="com/baeldung/hibernate/fetching/model/OrderDetail.hbm.xml" />
<mapping class="com.baeldung.hibernate.fetching.model.UserEager" />
<mapping class="com.baeldung.hibernate.fetching.model.OrderDetailEager" />
</session-factory>
</hibernate-configuration>

5
spring-hibernate4/src/test/resources/fetchingLazy.cfg.xml
View File

@ -11,7 +11,8 @@
<property name="hibernate.connection.password">iamtheking</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="show_sql">true</property>
<mapping resource="com/baeldung/hibernate/fetching/model/OrderDetail.hbm.xml" />
<mapping resource="com/baeldung/hibernate/fetching/model/UserLazy.hbm.xml" />
<mapping class="com.baeldung.hibernate.fetching.model.UserLazy" />
<mapping class="com.baeldung.hibernate.fetching.model.OrderDetailLazy" />
</session-factory>
</hibernate-configuration>