Java Hibernate Cookbook

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1. Author:Vishal Ranapariya, Yogesh Prajapati
   
2. Isbn:1784391905
   
3. Year:2015
   
4. Pages:250
   
5. Language:English
   
6. File size:2.04 MB
   
7. File format:PDF
   
8. Category:Java
   
9. Book Description:
   
10. 
    
11. Hibernate is a database independent technology, so the same code will work for all databases. It helps a Java developer write a query by mapping Java bean to database tables and help create tuned queries that boost performance. Even with limited SQL knowledge one can easily perform database operations. This makes the development faster and more accurate than JDBC. Hibernate supports useful features like connection pooling, caching, and inheritance etc.
    
12. 
    
13. This book will provide a useful hands-on guide to Hibernate to accomplish the development of a real-time Hibernate application.
    
14. 
    
15. We will start with the basics of Hibernate, which include setting up Hibernate – the pre-requisites and multiple ways of configuring Hibernate using Java. We will then dive deep into the fundamentals of Hibernate such as SessionFactory, session, criteria, working with objects and criteria. This will help a developer have a better understanding of how Hibernate works and what needs to be done to run a Hibernate application. Moving on, we will learn how to work with annotations, associations and collections. In the final chapters, we will see explore querying, advanced Hibernate concepts and integration with other frameworks.

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Java Hibernate Cookbook.pdf (2.02 MB)

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关键词：Hibernate Cookbook Book Cook Java Java

1. How to do it…
   
2. In this section, we will take a look at how to insert, retrieve, delete, and update List,
   
3. step by step.
   
4. Inserting a record
   
5. The following code is used to insert a record into the database. Here, we will try to insert the
   
6. record of an employee with three e-mail addresses:
   
7. Code
   
8. SessionFactory sessionFactory =
   
9. HibernateUtil.getSessionFactory();
   
10. Session session = sessionFactory.openSession();
    
11. Employee employee = new Employee();
    
12. employee.setName("yogesh");
    
13. List<String> emails = new ArrayList<String>();
    
14. emails.add("emailaddress1@provider1.com");
    
15. emails.add("emailaddress2@provider2.com");
    
16. emails.add("emailaddress3@provider3.com");
    
17. employee.setEmails(emails);
    
18. session.getTransaction().begin();
    
19. session.save(employee);
    
20. session.getTransaction().commit();

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1. Retrieving a record
   
2. Here, we know that the record is inserted with id 1. So, we will try to get only this record and
   
3. understand how List works.
   
4. Use the following code to retrieve the records of Employee#1:
   
5. Code
   
6. Employee employee = (Employee) session.get(Employee.class, 1l);
   
7. System.out.println(employee.toString());

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1. Updating a record
   
2. Here, we will try to add one more e-mail address to the list of e-mail IDs for Employee#1,
   
3. which means that we will update the list of e-mails. Use the following code to do so:
   
4. Code
   
5. Employee employee = (Employee) session.get(Employee.class, 1l);
   
6. List<String> emails = employee.getEmails();
   
7. emails.add("emailaddress3@provider3.com");
   
8. session.getTransaction().begin();
   
9. session.saveOrUpdate(employee);
   
10. session.getTransaction().commit();
    
11. System.out.println(employee.toString());

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1. Deleting a record
   
2. Here, we will try to delete the record of Employee#1 from the database using the following code:
   
3. Code
   
4. Employee employee = new Employee();
   
5. employee.setId(1);
   
6. session.getTransaction().begin();
   
7. session.delete(employee);
   
8. session.getTransaction().commit();

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1. Getting the required libraries for hibernate
   
2. 
   
3. To work with hibernate, we need a JAR (Java Archive) file provided by hibernate. Here, we will see how to download the hibernate core distribution. There are multiple ways to get the required libraries; here, we will consider two of them:
   
4. 
   
5. Manually downloading
   
6. Using Maven
   
7. Manually downloading
   
8. 
   
9. The first and most basic JAR file needed is a JDBC driver. The JDBC driver is a bridge or an API between Java and the database. The JDBC driver provides us with the generic classes that will help us communicate with the database. Generally, the driver is either provided by the database provider or developed by communities; however, you have to get it yourself. This also depends on the type of the database you are using. As we will use the MySQL database for this book, we will use the Mysql-Connector.jar file.
   
10. 
    
11. How to do it…
    
12. 
    
13. Let's come back to the library section. Apart from JDBC, you will need the JAR files for hibernate. Perform the following steps:
    
14. 
    
15. Download the hibernate core distribution from http://hibernate.org/orm/.
    
16. Now, place all the files in your classpath if you plan to run a standalone program and put them in the lib folder if it's a J2EE project.

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1. Create the Employee.java class and place the following code in the class:
   
2. public class Employee{
   
3.   private long id;
   
4.   private String firstName;
   
5.   private double salary;
   
6.   // other fields
   
7. 
   
8.   // default constructor
   
9.   public Employee() {
   
10.   }
    
11. 
    
12.   public long getId() {
    
13.        return id;
    
14.   }
    
15. 
    
16.   public void setId(long id) {
    
17.     this.id = id;
    
18.   }
    
19. 
    
20.   public String getFirstName() {
    
21.     return firstName;
    
22.   }
    
23. 
    
24.   public void setFirstName(String firstName) {
    
25.     this.firstName = firstName;
    
26.   }
    
27. 
    
28.   public double getSalary() {
    
29.     return salary;
    
30.   }
    
31. 
    
32.   public void setSalary(double salary) {
    
33.     this.salary = salary;
    
34.   }
    
35.   
    
36.   //
    
37.   // Getter and setter for other fields...
    
38.   //
    
39. 
    
40. }

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1. The following code is the definition for the Department class in Department.java:
   
2. 
   
3. public class Department{
   
4.   private long id;
   
5.   private String deptName;
   
6. 
   
7.   //default constructor
   
8.   public void Department(){
   
9.   }
   
10. 
    
11.   //getters and setters
    
12.   public long getId() {
    
13.     return id;
    
14.   }
    
15. 
    
16.   public void setId(long id) {
    
17.     this.id = id;
    
18.   }
    
19. 
    
20.   public String getDeptName() {
    
21.     return deptName;
    
22.   }
    
23. 
    
24.   public void setDeptName(String deptName) {
    
25.     this.deptName = deptName;
    
26.   }
    
27. 
    
28. }

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1. The following code is the definition for the Employee class in Employee.java:
   
2. 
   
3. public class Employee{
   
4.   private long id;
   
5.   private String firstName;
   
6.   private double salary;
   
7.   private Department department; // reference to Department.
   
8. 
   
9.   //default constructor
   
10.   public void Employee(){
    
11.   }
    
12. 
    
13.   //getters and setters
    
14.   public long getId() {
    
15.     return id;
    
16.   }
    
17. 
    
18.   public void setId(long id) {
    
19.     this.id = id;
    
20.   }
    
21. 
    
22.   public String getFirstName() {
    
23.     return firstName;
    
24.   }
    
25. 
    
26.   public void setFirstName(String firstName) {
    
27.     this.firstName = firstName;
    
28.   }
    
29. 
    
30.   public double getSalary() {
    
31.     return salary;
    
32.   }
    
33. 
    
34.   public void setSalary(double salary) {
    
35.     this.salary = salary;
    
36.   }
    
37. 
    
38.   public Department getDepartment(){
    
39.     return department;
    
40.   }
    
41. 
    
42.   public setDepartment(Department department){
    
43.     this.department = department;
    
44.   }
    
45.   
    
46. }

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1. How to do it…
   
2. 
   
3. To provide hibernate mapping based on XML, perform the following steps:
   
4. 
   
5. Ensure that the basic structure of the configuration file is as follows:
   
6. <!DOCTYPE hibernate-mapping PUBLIC
   
7. "-//Hibernate/Hibernate Mapping DTD X.X//EN"
   
8. "http://hibernate.sourceforge.net/hibernate-mapping-X.X.dtd">
   
9. <hibernate-mapping>
   
10. ...
    
11. </hibernate-mapping>
    
12. Note
    
13. 
    
14. We have not provided the DTD code for the future demo in this book, but it should be present while developing.
    
15. 
    
16. Create a XML file and name it Employee.hbm.xml. Then, add the configuration, as shown in the following code:
    
17. <hibernate-mapping>
    
18.   <class="Employee" table="employee">
    
19.     <id name="id" type="long" column="id">
    
20.       <generator class="increment" />
    
21.     </id>
    
22.     <property column="firstName" name="firstName" />
    
23.     <property column="salary" name="salary" />
    
24.     <!-- other properties mapping-->
    
25.   </class>
    
26. </hibernate-mapping>

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1. How to do it…
   
2. 
   
3. Now, let's create the class that contains the annotation-based mapping. As we used the Employee class to provide XML-based mapping here, we will use the same class with annotations:
   
4. 
   
5. Represent the annotation-based mapping for the Employee class in Employee.java, as shown in the following code:
   
6. import javax.persistence.Column;
   
7. import javax.persistence.Entity;
   
8. import javax.persistence.GeneratedValue;
   
9. import javax.persistence.Id;
   
10. import javax.persistence.Table;
    
11. 
    
12. @Entity
    
13. @Table(name="employee")
    
14. public class Employee{
    
15. 
    
16.   @Id
    
17.   @Column(name="id")
    
18.   @GeneratedValue(strategy = GenerationType.AUTO)
    
19.   private long id;
    
20. 
    
21.   @Column(name="firstname")
    
22.   private String firstName;
    
23. 
    
24.   @Column(name = "salary")
    
25.   private double salary;
    
26. 
    
27.   // default constructor
    
28.   public Employee() {
    
29.   }
    
30. 
    
31.   public long getId() {
    
32.     return id;
    
33.   }
    
34. 
    
35.   public void setId(long id) {
    
36.     this.id = id;
    
37.   }
    
38. 
    
39.   public String getFirstName() {
    
40.       return firstName;
    
41.   }
    
42. 
    
43.   public void setFirstName(String firstName) {
    
44.     this.firstName = firstName;
    
45.   }
    
46. 
    
47.   public double getSalary() {
    
48.     return salary;
    
49.   }
    
50. 
    
51.   public void setSalary(double salary) {
    
52.     this.salary = salary;
    
53.   }
    
54. 
    
55. }

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Lisrelchen 发表于 2016-8-26 07:18
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