From 310599742c4cbabb12cd8a75b970eb2cd2ce76ac Mon Sep 17 00:00:00 2001
From: Martin Goik <goik@hdm-stuttgart.de>
Date: Mon, 22 Apr 2013 21:26:13 +0200
Subject: [PATCH] oneToOne, cascading persistence
---
Doc/course.xml | 154 +++++++++++++++++-
.../main/java/entity/company1/Employee.java | 70 ++++++++
.../src/main/java/entity/company1/Laptop.java | 57 +++++++
.../main/java/entity/company1/Persist1.java | 30 ++++
.../main/java/entity/company1/Persist2.java | 39 +++++
.../java/entity/company1/hibernate.cfg.xml | 21 +++
.../main/java/entity/company2/Employee.java | 71 ++++++++
.../src/main/java/entity/company2/Laptop.java | 57 +++++++
.../entity/company2/LoadAndDeRegister.java | 26 +++
.../main/java/entity/company2/Persist.java | 33 ++++
.../java/entity/company2/hibernate.cfg.xml | 21 +++
11 files changed, 577 insertions(+), 2 deletions(-)
create mode 100644 ws/eclipse/HibIntro/src/main/java/entity/company1/Employee.java
create mode 100644 ws/eclipse/HibIntro/src/main/java/entity/company1/Laptop.java
create mode 100644 ws/eclipse/HibIntro/src/main/java/entity/company1/Persist1.java
create mode 100644 ws/eclipse/HibIntro/src/main/java/entity/company1/Persist2.java
create mode 100644 ws/eclipse/HibIntro/src/main/java/entity/company1/hibernate.cfg.xml
create mode 100644 ws/eclipse/HibIntro/src/main/java/entity/company2/Employee.java
create mode 100644 ws/eclipse/HibIntro/src/main/java/entity/company2/Laptop.java
create mode 100644 ws/eclipse/HibIntro/src/main/java/entity/company2/LoadAndDeRegister.java
create mode 100644 ws/eclipse/HibIntro/src/main/java/entity/company2/Persist.java
create mode 100644 ws/eclipse/HibIntro/src/main/java/entity/company2/hibernate.cfg.xml
diff --git a/Doc/course.xml b/Doc/course.xml
index 46c16a757..6ff75c093 100644
--- a/Doc/course.xml
+++ b/Doc/course.xml
@@ -15686,7 +15686,9 @@ Namespace '<emphasis role="bold">http://www.w3.org/2000/svg</emphasis>' contains
<listitem>
<para>Counting frequencies and grouping by namespaces may be
achieved by using standard Java container implementations of
- <classname>java.util.Map</classname>.</para>
+ <classname>java.util.Map</classname>. You may for example
+ define sets of related XML elements and group them by their
+ corresponding namespaces.</para>
</listitem>
<listitem>
@@ -18067,6 +18069,9 @@ CREATE TABLE BankAccount (
</glossentry>
</glosslist>
+ <para>We recommend <xref linkend="Bloch08"/> regarding Java identity
+ and equality of objects.</para>
+
<section xml:id="objectEqualityByPrimaryKey">
<title>Defining object equality by primary key</title>
@@ -18181,6 +18186,11 @@ public class User {
identical hash code value <code>a.hashCode() ==
b.hashCode()</code> in order to satisfy a collection's
contract.</para>
+
+ <para><xref linkend="Bloch08"/> covers the contract of
+ <methodname>Object.hashCode()</methodname> and its close relation
+ to <methodname>Object.equals(Object)</methodname> in
+ detail.</para>
</caution>
</section>
@@ -18522,7 +18532,7 @@ public class PersistUser {
</qandaset>
<section xml:id="valueSets">
- <title>Sets</title>
+ <title>Sets and lists</title>
<para>Users may have multiple email addresses:</para>
@@ -18634,6 +18644,146 @@ public class PersistUser {
</qandaset>
</section>
</section>
+
+ <section xml:id="mappingEntities">
+ <title>Mapping entities</title>
+
+ <para>In contrast to mapping an entity having components we may also
+ persist relations between entities. We start with
+ <classname>entity.company1.Employee</classname>s possibly having
+ <classname>entity.company1.Laptop</classname>s assigned. So an
+ employee may or may not have one device at its disposal.</para>
+
+ <para>There may be other references to each laptop. So in contrast to
+ our email component examples
+ <classname>entity.company1.Laptop</classname> instances are
+ identifiable database objects and hence entities. Therefore we have to
+ add a <code>@OneToOne</code> annotation <coref
+ linkend="laptopOneToOne"/>:</para>
+
+ <programlisting>package entity.company1;
+...
+@Entity ...
+public class Employee {
+...
+
+ public int getStaffNumber() { return staffNumber;}
+...
+ public String getCname() { return cname;}
+...
+ /**
+ * @return Laptop currently "owned" by {@link Employee}.
+ */
+ <emphasis role="bold">@OneToOne</emphasis> <co xml:id="laptopOneToOne"/>
+ public Laptop getLaptop() { return laptop;}
+ public void setLaptop(Laptop laptop) {this.laptop = laptop;}
+ private Laptop laptop;
+...</programlisting>
+
+ <para>Populating the database with data seems to be quite
+ straightforward:</para>
+
+ <programlisting>package entity.company1;
+...
+public class Persist1 {
+...
+ final Employee martin = new Employee(123, "Martin Goik"),
+ eve = new Employee(140, "Eve Blix");
+
+ final Laptop superCoolGadget = new Laptop(2213);
+ eve.setLaptop(superCoolGadget);
+ session.save(martin);
+ session.save(eve);
+ transaction.commit(); ...</programlisting>
+
+ <para>This actually fails:</para>
+
+ <programlisting> <classname>org.hibernate.TransientObjectException</classname>:
+ object references an unsaved transient instance -
+ save the transient instance before flushing: <classname>entity.company1.Laptop</classname></programlisting>
+
+ <para>There are at least two possible solutions:</para>
+
+ <orderedlist>
+ <listitem>
+ <para>We may save the dependent transient
+ <classname>entity.company1.Laptop</classname> instance along with
+ the two <classname>entity.company1.Employee</classname> instances.
+ There is no restriction regarding the order of these three save
+ operations but they must happen within the same
+ transaction:</para>
+
+ <programlisting>package entity.company1;
+...
+public class Persist2 {
+...
+ final Employee martin = new Employee(123, "Martin Goik"),
+ eve = new Employee(140, "Eve Blix");
+
+ final Laptop superCoolGadget = new Laptop(2213);
+ eve.setLaptop(superCoolGadget);
+ session.save(martin);
+ session.save(eve);
+
+ session.save(superCoolGadget);
+
+ transaction.commit(); ...</programlisting>
+ </listitem>
+
+ <listitem>
+ <para>Hibernate supports the <quote>persistence by
+ reachability</quote> concept. Thus saving an
+ <classname>entity.company1.Employee</classname> instance should
+ save possibly referenced
+ <classname>entity.company1.Laptop</classname> instances as
+ well:</para>
+
+ <programlisting>package entity.company2;
+...
+public class Employee {
+...
+ @OneToOne(<emphasis role="bold">cascade={CascadeType.ALL}</emphasis>)
+ public Laptop getLaptop() { return laptop;}
+ ...</programlisting>
+
+ <para>No we do no longer have to care about referenced
+ <classname>entity.company1.Laptop</classname>s:</para>
+
+ <programlisting>package entity.company2;
+...
+public class Persist {
+...
+ final Employee martin = new Employee(123, "Martin Goik"),
+ eve = new Employee(140, "Eve Blix");
+
+ final Laptop superCoolGadget = new Laptop(2213);
+ eve.setLaptop(superCoolGadget);
+ // Now only save the employee transients,
+ // superCoolGadget will be saved automatically due to
+ // CascadeType.ALL
+ session.save(martin);
+ session.save(eve);
+ transaction.commit();...</programlisting>
+ </listitem>
+ </orderedlist>
+
+ <para>After successfully inserting these three entities
+ <personname>Eve Blix</personname> may no longer be entitled to use her
+ laptop. We decouple these two entities:</para>
+
+ <programlisting>package entity.company2;
+public class LoadAndDeRegister {
+...
+ final Transaction transaction = session.beginTransaction();
+ final Employee eve = (Employee) session.load(Employee.class, 2L);
+
+ eve.setLaptop(null);
+
+ transaction.commit();</programlisting>
+
+ <para>All three entities are still present in our database but the
+ corresponding foreign key has been set to <code>NULL</code>.</para>
+ </section>
</chapter>
</part>
diff --git a/ws/eclipse/HibIntro/src/main/java/entity/company1/Employee.java b/ws/eclipse/HibIntro/src/main/java/entity/company1/Employee.java
new file mode 100644
index 000000000..3143f81fc
--- /dev/null
+++ b/ws/eclipse/HibIntro/src/main/java/entity/company1/Employee.java
@@ -0,0 +1,70 @@
+package entity.company1;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.Id;
+import javax.persistence.OneToOne;
+import javax.persistence.Table;
+import javax.persistence.UniqueConstraint;
+
+import entity.company12.Department;
+
+/**
+ *
+ * {@link Employee} instances related to {@link Department}
+ *
+ */
+@Entity
+@Table(uniqueConstraints={@UniqueConstraint(columnNames={"staffNumber"})})
+public class Employee {
+
+ @Id
+ @GeneratedValue
+ public Long getId() {return id;}
+ protected void setId(Long id) {this.id = id;}
+ private Long id;
+
+ public int getStaffNumber() { return staffNumber;}
+ public void setStaffNumber(int staffNumber) { this.staffNumber = staffNumber;}
+ int staffNumber = Integer.MIN_VALUE;
+
+ public String getCname() { return cname;}
+ public void setCname(String cname) { this.cname = cname;}
+ private String cname; // Common name
+
+ /**
+ * @return Laptop currently "owned" by {@link Employee}.
+ */
+ @OneToOne
+ public Laptop getLaptop() { return laptop;}
+ public void setLaptop(Laptop laptop) {this.laptop = laptop;}
+ private Laptop laptop;// Workstation for employees.
+
+ protected Employee(){}
+
+ public Employee(final int staffNumber, final String cname) {
+ setStaffNumber(staffNumber);
+ setCname(cname);
+ }
+ @Override
+ public boolean equals(Object other) {
+ if (this == other) {
+ return true;
+ } else if (Integer.MIN_VALUE == getStaffNumber()) {
+ return false;
+ } else if (other instanceof Employee) {
+ final Employee that = (Employee) other;
+ return this.getStaffNumber() == that.getStaffNumber();
+ } else {
+ return false;
+ }
+ }
+ @Override
+ public int hashCode() {
+ if (Integer.MIN_VALUE == getStaffNumber()) {
+ return System.identityHashCode(this);
+ } else {
+ return getStaffNumber();
+ }
+ }
+}
\ No newline at end of file
diff --git a/ws/eclipse/HibIntro/src/main/java/entity/company1/Laptop.java b/ws/eclipse/HibIntro/src/main/java/entity/company1/Laptop.java
new file mode 100644
index 000000000..52dfb3ee1
--- /dev/null
+++ b/ws/eclipse/HibIntro/src/main/java/entity/company1/Laptop.java
@@ -0,0 +1,57 @@
+package entity.company1;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.Id;
+import javax.persistence.Table;
+import javax.persistence.UniqueConstraint;
+
+/**
+ *
+ * Laptops possibly being assigned to {@link Employee}
+ *
+ */
+@Entity
+@Table(uniqueConstraints={@UniqueConstraint(columnNames={"idNumber"})})
+public class Laptop {
+
+ @Id
+ @GeneratedValue
+ public Long getId() {return id;}
+ protected void setId(Long id) {this.id = id;}
+ private Long id;
+
+ /**
+ * @return The device's unique part number
+ */
+ public int getIdNumber() { return idNumber;}
+ public void setIdNumber(int idNumber) { this.idNumber = idNumber;}
+ int idNumber;
+
+ protected Laptop(){}
+
+ public Laptop(final int idNumber) {
+ setIdNumber(idNumber);
+ }
+ @Override
+ public boolean equals(Object other) {
+ if (this == other) {
+ return true;
+ } else if (Integer.MIN_VALUE == getIdNumber()) {
+ return false;
+ } else if (other instanceof Laptop) {
+ final Laptop that = (Laptop) other;
+ return this.getIdNumber() == that.getIdNumber();
+ } else {
+ return false;
+ }
+ }
+ @Override
+ public int hashCode() {
+ if (Integer.MIN_VALUE == getIdNumber()) {
+ return System.identityHashCode(this);
+ } else {
+ return getIdNumber();
+ }
+ }
+}
\ No newline at end of file
diff --git a/ws/eclipse/HibIntro/src/main/java/entity/company1/Persist1.java b/ws/eclipse/HibIntro/src/main/java/entity/company1/Persist1.java
new file mode 100644
index 000000000..bd386e971
--- /dev/null
+++ b/ws/eclipse/HibIntro/src/main/java/entity/company1/Persist1.java
@@ -0,0 +1,30 @@
+package entity.company1;
+
+import hibintro.util.HibernateUtil;
+
+import org.hibernate.Session;
+import org.hibernate.Transaction;
+
+/**
+ * Persisting {@link Employee} possibly along with
+ * personal assigned laptops.
+ */
+public class Persist1 {
+ /**
+ * @param args not used.
+ */
+ public static void main(String[] args) {
+ final Session session = HibernateUtil.createSessionFactory("entity/company1/hibernate.cfg.xml").openSession();
+ {
+ final Transaction transaction = session.beginTransaction();
+ final Employee martin = new Employee(123, "Martin Goik"),
+ eve = new Employee(140, "Eve Blix");
+
+ final Laptop superCoolGadget = new Laptop(2213);
+ eve.setLaptop(superCoolGadget);
+ session.save(martin);
+ session.save(eve);
+ transaction.commit();
+ }
+ }
+}
\ No newline at end of file
diff --git a/ws/eclipse/HibIntro/src/main/java/entity/company1/Persist2.java b/ws/eclipse/HibIntro/src/main/java/entity/company1/Persist2.java
new file mode 100644
index 000000000..a078e3611
--- /dev/null
+++ b/ws/eclipse/HibIntro/src/main/java/entity/company1/Persist2.java
@@ -0,0 +1,39 @@
+package entity.company1;
+
+import hibintro.util.HibernateUtil;
+
+import org.hibernate.Session;
+import org.hibernate.Transaction;
+
+/**
+ * @author goik
+ *
+ * Persisting {@link Employee} possibly along with
+ * personally assigned laptops. Persisting dependent
+ * transient objects corrects bug in {@link Persist1}
+ *
+ */
+public class Persist2 {
+
+ /**
+ * @param args not used.
+ */
+ public static void main(String[] args) {
+ final Session session = HibernateUtil.createSessionFactory("entity/company1/hibernate.cfg.xml").openSession();
+
+ {
+ final Transaction transaction = session.beginTransaction();
+ final Employee martin = new Employee(123, "Martin Goik"),
+ eve = new Employee(140, "Eve Blix");
+
+ final Laptop superCoolGadget = new Laptop(2213);
+ eve.setLaptop(superCoolGadget);
+ session.save(martin);
+ session.save(eve);
+
+ session.save(superCoolGadget);
+
+ transaction.commit();
+ }
+ }
+}
\ No newline at end of file
diff --git a/ws/eclipse/HibIntro/src/main/java/entity/company1/hibernate.cfg.xml b/ws/eclipse/HibIntro/src/main/java/entity/company1/hibernate.cfg.xml
new file mode 100644
index 000000000..261f65541
--- /dev/null
+++ b/ws/eclipse/HibIntro/src/main/java/entity/company1/hibernate.cfg.xml
@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<!DOCTYPE hibernate-configuration PUBLIC
+ "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
+ "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
+
+<hibernate-configuration>
+ <session-factory >
+ <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
+ <property name="hibernate.connection.password">XYZ</property>
+ <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/hdm</property>
+ <property name="hibernate.connection.username">hdmuser</property>
+ <property name="hibernate.dialect">org.hibernate.dialect.MySQL5InnoDBDialect</property>
+ <property name="hibernate.show_sql">false</property>
+ <property name="hibernate.format_sql">true</property>
+ <property name="hibernate.hbm2ddl.auto">update</property>
+
+ <mapping class="entity.company1.Laptop"/>
+ <mapping class="entity.company1.Employee"/>
+ </session-factory>
+</hibernate-configuration>
diff --git a/ws/eclipse/HibIntro/src/main/java/entity/company2/Employee.java b/ws/eclipse/HibIntro/src/main/java/entity/company2/Employee.java
new file mode 100644
index 000000000..ada3cda7a
--- /dev/null
+++ b/ws/eclipse/HibIntro/src/main/java/entity/company2/Employee.java
@@ -0,0 +1,71 @@
+package entity.company2;
+
+import javax.persistence.CascadeType;
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.Id;
+import javax.persistence.OneToOne;
+import javax.persistence.Table;
+import javax.persistence.UniqueConstraint;
+
+import entity.company12.Department;
+
+/**
+ *
+ * {@link Employee} instances related to {@link Department}
+ *
+ */
+@Entity
+@Table(uniqueConstraints={@UniqueConstraint(columnNames={"staffNumber"})})
+public class Employee {
+
+ @Id
+ @GeneratedValue
+ public Long getId() {return id;}
+ protected void setId(Long id) {this.id = id;}
+ private Long id;
+
+ public int getStaffNumber() { return staffNumber;}
+ public void setStaffNumber(int staffNumber) { this.staffNumber = staffNumber;}
+ int staffNumber = Integer.MIN_VALUE;
+
+ public String getCname() { return cname;}
+ public void setCname(String cname) { this.cname = cname;}
+ private String cname; // Common name
+
+ /**
+ * @return Laptop possibly "owned" by {@link Employee}.
+ */
+ @OneToOne(cascade={CascadeType.ALL})
+ public Laptop getLaptop() { return laptop;}
+ public void setLaptop(Laptop laptop) {this.laptop = laptop;}
+ private Laptop laptop;// Workstation for employees.
+
+ protected Employee(){}
+
+ public Employee(final int staffNumber, final String cname) {
+ setStaffNumber(staffNumber);
+ setCname(cname);
+ }
+ @Override
+ public boolean equals(Object other) {
+ if (this == other) {
+ return true;
+ } else if (Integer.MIN_VALUE == getStaffNumber()) {
+ return false;
+ } else if (other instanceof Employee) {
+ final Employee that = (Employee) other;
+ return this.getStaffNumber() == that.getStaffNumber();
+ } else {
+ return false;
+ }
+ }
+ @Override
+ public int hashCode() {
+ if (Integer.MIN_VALUE == getStaffNumber()) {
+ return System.identityHashCode(this);
+ } else {
+ return getStaffNumber();
+ }
+ }
+}
\ No newline at end of file
diff --git a/ws/eclipse/HibIntro/src/main/java/entity/company2/Laptop.java b/ws/eclipse/HibIntro/src/main/java/entity/company2/Laptop.java
new file mode 100644
index 000000000..462aa3b7f
--- /dev/null
+++ b/ws/eclipse/HibIntro/src/main/java/entity/company2/Laptop.java
@@ -0,0 +1,57 @@
+package entity.company2;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.Id;
+import javax.persistence.Table;
+import javax.persistence.UniqueConstraint;
+
+/**
+ *
+ * Laptops possibly being assigned to {@link Employee}
+ *
+ */
+@Entity
+@Table(uniqueConstraints={@UniqueConstraint(columnNames={"idNumber"})})
+public class Laptop {
+
+ @Id
+ @GeneratedValue
+ public Long getId() {return id;}
+ protected void setId(Long id) {this.id = id;}
+ private Long id;
+
+ /**
+ * @return The device's unique part number
+ */
+ public int getIdNumber() { return idNumber;}
+ public void setIdNumber(int idNumber) { this.idNumber = idNumber;}
+ int idNumber;
+
+ protected Laptop(){}
+
+ public Laptop(final int idNumber) {
+ setIdNumber(idNumber);
+ }
+ @Override
+ public boolean equals(Object other) {
+ if (this == other) {
+ return true;
+ } else if (Integer.MIN_VALUE == getIdNumber()) {
+ return false;
+ } else if (other instanceof Laptop) {
+ final Laptop that = (Laptop) other;
+ return this.getIdNumber() == that.getIdNumber();
+ } else {
+ return false;
+ }
+ }
+ @Override
+ public int hashCode() {
+ if (Integer.MIN_VALUE == getIdNumber()) {
+ return System.identityHashCode(this);
+ } else {
+ return getIdNumber();
+ }
+ }
+}
\ No newline at end of file
diff --git a/ws/eclipse/HibIntro/src/main/java/entity/company2/LoadAndDeRegister.java b/ws/eclipse/HibIntro/src/main/java/entity/company2/LoadAndDeRegister.java
new file mode 100644
index 000000000..b4040b6d1
--- /dev/null
+++ b/ws/eclipse/HibIntro/src/main/java/entity/company2/LoadAndDeRegister.java
@@ -0,0 +1,26 @@
+package entity.company2;
+
+import hibintro.util.HibernateUtil;
+
+import org.hibernate.Session;
+import org.hibernate.Transaction;
+
+/**
+ * Removing {@link Laptop} from {@link Employee}
+ */
+public class LoadAndDeRegister {
+ /**
+ * @param args not used.
+ */
+ public static void main(String[] args) {
+ final Session session = HibernateUtil.createSessionFactory("entity/company2/hibernate.cfg.xml").openSession();
+ {
+ final Transaction transaction = session.beginTransaction();
+ final Employee eve = (Employee) session.load(Employee.class, 2L);
+
+ eve.setLaptop(null);
+
+ transaction.commit();
+ }
+ }
+}
\ No newline at end of file
diff --git a/ws/eclipse/HibIntro/src/main/java/entity/company2/Persist.java b/ws/eclipse/HibIntro/src/main/java/entity/company2/Persist.java
new file mode 100644
index 000000000..d68352e66
--- /dev/null
+++ b/ws/eclipse/HibIntro/src/main/java/entity/company2/Persist.java
@@ -0,0 +1,33 @@
+package entity.company2;
+
+import hibintro.util.HibernateUtil;
+
+import org.hibernate.Session;
+import org.hibernate.Transaction;
+
+/**
+ * Persisting {@link Employee} possibly along with
+ * personal assigned laptops.
+ */
+public class Persist {
+ /**
+ * @param args not used.
+ */
+ public static void main(String[] args) {
+ final Session session = HibernateUtil.createSessionFactory("entity/company2/hibernate.cfg.xml").openSession();
+ {
+ final Transaction transaction = session.beginTransaction();
+ final Employee martin = new Employee(123, "Martin Goik"),
+ eve = new Employee(140, "Eve Blix");
+
+ final Laptop superCoolGadget = new Laptop(2213);
+ eve.setLaptop(superCoolGadget);
+ // Now only save the employee transients,
+ // superCoolGadget will be saved automatically due to
+ // CascadeType.ALL
+ session.save(martin);
+ session.save(eve);
+ transaction.commit();
+ }
+ }
+}
\ No newline at end of file
diff --git a/ws/eclipse/HibIntro/src/main/java/entity/company2/hibernate.cfg.xml b/ws/eclipse/HibIntro/src/main/java/entity/company2/hibernate.cfg.xml
new file mode 100644
index 000000000..57b61c84a
--- /dev/null
+++ b/ws/eclipse/HibIntro/src/main/java/entity/company2/hibernate.cfg.xml
@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<!DOCTYPE hibernate-configuration PUBLIC
+ "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
+ "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
+
+<hibernate-configuration>
+ <session-factory >
+ <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
+ <property name="hibernate.connection.password">XYZ</property>
+ <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/hdm</property>
+ <property name="hibernate.connection.username">hdmuser</property>
+ <property name="hibernate.dialect">org.hibernate.dialect.MySQL5InnoDBDialect</property>
+ <property name="hibernate.show_sql">false</property>
+ <property name="hibernate.format_sql">true</property>
+ <property name="hibernate.hbm2ddl.auto">update</property>
+
+ <mapping class="entity.company2.Laptop"/>
+ <mapping class="entity.company2.Employee"/>
+ </session-factory>
+</hibernate-configuration>
--
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