From af683e5c336c5df199f6cd30f19cf8b6e674f9e0 Mon Sep 17 00:00:00 2001
From: Martin Goik <goik@hdm-stuttgart.de>
Date: Thu, 2 May 2013 22:28:39 +0200
Subject: [PATCH] many to many relationship
---
.../main/java/entity/company7/Persist.java | 42 +++++++++
.../entity/company7/ReassignProjects.java | 44 +++++++++
.../java/entity/company7/hibernate.cfg.xml | 22 +++++
.../java/entity/company7/model/Employee.java | 89 +++++++++++++++++++
.../java/entity/company7/model/Laptop.java | 63 +++++++++++++
.../java/entity/company7/model/Project.java | 59 ++++++++++++
6 files changed, 319 insertions(+)
create mode 100644 ws/eclipse/HibIntro/src/main/java/entity/company7/Persist.java
create mode 100644 ws/eclipse/HibIntro/src/main/java/entity/company7/ReassignProjects.java
create mode 100644 ws/eclipse/HibIntro/src/main/java/entity/company7/hibernate.cfg.xml
create mode 100644 ws/eclipse/HibIntro/src/main/java/entity/company7/model/Employee.java
create mode 100644 ws/eclipse/HibIntro/src/main/java/entity/company7/model/Laptop.java
create mode 100644 ws/eclipse/HibIntro/src/main/java/entity/company7/model/Project.java
diff --git a/ws/eclipse/HibIntro/src/main/java/entity/company7/Persist.java b/ws/eclipse/HibIntro/src/main/java/entity/company7/Persist.java
new file mode 100644
index 000000000..29349ce32
--- /dev/null
+++ b/ws/eclipse/HibIntro/src/main/java/entity/company7/Persist.java
@@ -0,0 +1,42 @@
+package entity.company7;
+
+import hibintro.util.HibernateUtil;
+
+import org.hibernate.Session;
+import org.hibernate.Transaction;
+
+import entity.company7.model.Employee;
+import entity.company7.model.Project;
+
+
+
+/**
+ * Defining many-to-many relationship between
+ * {@link Employee} and {@link Project}
+ *
+ */
+public class Persist {
+ public static void main(String[] args) {
+ final Session session = HibernateUtil.createSessionFactory("entity/company7/hibernate.cfg.xml").openSession();
+ {
+ final Transaction transaction = session.beginTransaction();
+ final Employee martin = new Employee(123, "Martin Goik"),
+ eve = new Employee(140, "Eve Blix"),
+ jim = new Employee(160, "Jim Clarke");
+
+ session.save(martin);
+ session.save(eve);
+ session.save(jim);
+
+ final Project water = new Project(1, "Water supply")
+ ,health = new Project(2, "Health management");
+
+ session.save(water);
+ session.save(health);
+
+ martin.addProject(water);
+
+ transaction.commit();
+ }
+ }
+}
\ No newline at end of file
diff --git a/ws/eclipse/HibIntro/src/main/java/entity/company7/ReassignProjects.java b/ws/eclipse/HibIntro/src/main/java/entity/company7/ReassignProjects.java
new file mode 100644
index 000000000..dfae7b4f7
--- /dev/null
+++ b/ws/eclipse/HibIntro/src/main/java/entity/company7/ReassignProjects.java
@@ -0,0 +1,44 @@
+package entity.company7;
+
+import hibintro.util.HibernateUtil;
+
+import org.hibernate.Criteria;
+import org.hibernate.Session;
+import org.hibernate.Transaction;
+import org.hibernate.criterion.Restrictions;
+
+import entity.company7.model.Employee;
+import entity.company7.model.Project;
+
+public class ReassignProjects {
+
+ public static void main(String[] args) {
+
+
+
+ final Session session = HibernateUtil.createSessionFactory("entity/company7/hibernate.cfg.xml").openSession();
+ {
+ final Transaction transaction = session.beginTransaction();
+
+ final Employee
+ martin = (Employee) session.createCriteria(Employee.class).add(
+ Restrictions.eq("staffNumber", 123)).list().get(0)
+ ,eve = (Employee) session.createCriteria(Employee.class).add(
+ Restrictions.eq("staffNumber", 140)). list().get(0)
+ ,jim = (Employee) session.createCriteria(Employee.class).add(
+ Restrictions.eq("staffNumber", 160)). list().get(0);
+
+ final Criteria searchProject = session.createCriteria(Project.class);
+
+ final Project water = (Project) searchProject.add(Restrictions.eq("no", 1)).list().get(0);
+ martin.removeProject(water);
+
+ eve.addProject(water);
+ jim.addProject(water);
+ session.save(martin);
+ session.save(eve);
+ session.save(jim);
+ transaction.commit();
+ }
+ }
+}
\ No newline at end of file
diff --git a/ws/eclipse/HibIntro/src/main/java/entity/company7/hibernate.cfg.xml b/ws/eclipse/HibIntro/src/main/java/entity/company7/hibernate.cfg.xml
new file mode 100644
index 000000000..0859dc3b4
--- /dev/null
+++ b/ws/eclipse/HibIntro/src/main/java/entity/company7/hibernate.cfg.xml
@@ -0,0 +1,22 @@
+<?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">true</property>
+ <property name="hibernate.format_sql">true</property>
+ <property name="hibernate.hbm2ddl.auto">update</property>
+
+ <mapping class="entity.company7.model.Laptop"/>
+ <mapping class="entity.company7.model.Employee"/>
+ <mapping class="entity.company7.model.Project"/>
+ </session-factory>
+</hibernate-configuration>
diff --git a/ws/eclipse/HibIntro/src/main/java/entity/company7/model/Employee.java b/ws/eclipse/HibIntro/src/main/java/entity/company7/model/Employee.java
new file mode 100644
index 000000000..2390a22c4
--- /dev/null
+++ b/ws/eclipse/HibIntro/src/main/java/entity/company7/model/Employee.java
@@ -0,0 +1,89 @@
+package entity.company7.model;
+
+import java.util.HashSet;
+import java.util.Set;
+
+import javax.persistence.CascadeType;
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.Id;
+import javax.persistence.ManyToMany;
+import javax.persistence.OneToOne;
+import javax.persistence.Table;
+import javax.persistence.UniqueConstraint;
+
+
+/**
+ *
+ * {@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
+
+ /**
+ * One {@link Laptop} per {@link Employee}.
+ *
+ * @return {@link Laptop} "owned" by {@link Employee}.
+ */
+ @OneToOne(cascade={CascadeType.ALL})
+ public Laptop getLaptop() { return laptop;}
+
+ public void setLaptop(final Laptop laptop) {
+ if (getLaptop() == laptop) { return;}
+ if (null != getLaptop()) { getLaptop().setOwnerInternal(null);}
+ setLaptopInternal(laptop);
+ if (null != getLaptop()) {getLaptop().setOwnerInternal(this);}
+ }
+
+ protected void setLaptopInternal(final Laptop laptop) { this.laptop = laptop;}
+ private Laptop laptop;
+
+ @ManyToMany
+ public Set<Project> getProjects() { return projects;}
+ protected void setProjects(Set<Project> projects) { this.projects = projects;}
+ public void addProject(final Project project) {
+ getProjects().add(project);
+ project.getCollaborators().add(this);
+ }
+ public void removeProject(final Project project) {
+ getProjects().remove(project);
+ project.getCollaborators().remove(this);
+ }
+
+ private Set<Project> projects = new HashSet<Project>();
+
+ 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 (other instanceof Employee) {
+ return getStaffNumber() == ((Employee) other).getStaffNumber();
+ } else {
+ return false;
+ }
+ }
+ @Override
+ public int hashCode() { return getStaffNumber();}
+}
\ No newline at end of file
diff --git a/ws/eclipse/HibIntro/src/main/java/entity/company7/model/Laptop.java b/ws/eclipse/HibIntro/src/main/java/entity/company7/model/Laptop.java
new file mode 100644
index 000000000..fd7d7f89f
--- /dev/null
+++ b/ws/eclipse/HibIntro/src/main/java/entity/company7/model/Laptop.java
@@ -0,0 +1,63 @@
+package entity.company7.model;
+
+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;
+
+
+/**
+ *
+ * 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;
+
+ @OneToOne (mappedBy="laptop",cascade={CascadeType.ALL})
+ public Employee getOwner() { return owner;}
+
+ public void setOwner(Employee owner) {
+ if (getOwner() == owner) { return;}
+ if (null != getOwner()) { getOwner().setLaptopInternal(null);}
+ setOwnerInternal(owner);
+ if (null != getOwner()) { getOwner().setLaptopInternal(this);}
+ }
+ protected void setOwnerInternal(Employee owner) { this.owner = owner;}
+ Employee owner;
+
+ protected Laptop(){}
+
+ public Laptop(final int idNumber) {
+ setIdNumber(idNumber);
+ }
+ @Override
+ public boolean equals(Object other) {
+ if (this == other) {
+ return true;
+ } else if (other instanceof Laptop) {
+ return this.getIdNumber() == ((Laptop) other).getIdNumber();
+ } else {
+ return false;
+ }
+ }
+ @Override
+ public int hashCode() { return getIdNumber();}
+}
\ No newline at end of file
diff --git a/ws/eclipse/HibIntro/src/main/java/entity/company7/model/Project.java b/ws/eclipse/HibIntro/src/main/java/entity/company7/model/Project.java
new file mode 100644
index 000000000..2195a71c2
--- /dev/null
+++ b/ws/eclipse/HibIntro/src/main/java/entity/company7/model/Project.java
@@ -0,0 +1,59 @@
+package entity.company7.model;
+
+import java.util.HashSet;
+import java.util.Set;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.Id;
+import javax.persistence.ManyToMany;
+import javax.persistence.Table;
+import javax.persistence.UniqueConstraint;
+
+/**
+ *
+ * {@link Project} instances related to {@link Employee}
+ *
+ */
+@Entity
+@Table(uniqueConstraints={@UniqueConstraint(columnNames={"no"})})
+public class Project {
+
+ @Id
+ @GeneratedValue
+ public Long getId() {return id;}
+ protected void setId(Long id) {this.id = id;}
+ private Long id;
+
+ public int getNo() { return no;}
+ public void setNo(int no) { this.no = no;}
+ int no;
+
+ public String getTitle() { return title;}
+ public void setTitle(String title) { this.title = title;}
+ String title;
+
+ @ManyToMany(mappedBy="projects")
+ public Set<Employee> getCollaborators() { return collaborators;}
+ public void setCollaborators(Set<Employee> collaborators) { this.collaborators = collaborators;}
+ private Set<Employee> collaborators = new HashSet<Employee>();
+
+ protected Project(){}
+
+ public Project(final int no, final String title) {
+ setNo(no);
+ setTitle(title);
+ }
+ @Override
+ public boolean equals(Object other) {
+ if (this == other) {
+ return true;
+ } else if (other instanceof Project) {
+ return getNo() == ((Project) other).getNo();
+ } else {
+ return false;
+ }
+ }
+ @Override
+ public int hashCode() { return getNo();}
+}
\ No newline at end of file
--
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