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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. pixia-club.info Java Hibernate Cookbook Over 50 recipes to help you . eBook versions of every book published, with PDF and ePub iles available?. Explanations with complete working examples Whenever something is explained you will find a complete sample application. If a specific mapping is.

Java Hibernate Cookbook Pdf

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Over 50 recipes to help you build dynamic and powerful real-time Java Hibernate applications. Download PDF. JAVA HIBERNATE COOKBOOK. To download Java Hibernate Cookbook PDF, please access the web link below and save the ebook or gain. Over 50 recipes to help you build dynamic and powerful real-time Java Hibernate applications About This Book Learn to associate JDBC and Hibernate with.

Get unlimited access to videos, live online training, learning paths, books, tutorials, and more. Start Free Trial No credit card required. Java Hibernate Cookbook 1 review. View table of contents. Start reading. Book Description Over 50 recipes to help you build dynamic and powerful real-time Java Hibernate applications About This Book Learn to associate JDBC and Hibernate with object persistence Manage association mappings, implement basic annotations and learn caching Get to grips with Hibernate fundamentals from installation to developing a business application with this step-by-step guide Who This Book Is For This is book for Java developers who now want to learn Hibernate.

What You Will Learn Set up and install Hibernate on your system and explore different ways in which Hibernate can be configured Learn the basic concepts and fundamentals of Java Hibernate Define mappings without a use of XML file using Annotations Persist collection elements such as list, map, set and array Explore the various mapping options and learn to work with Hibernate associations Understand advanced Hibernate concepts such as caching and inheritance Develop an engaging and robust real-world hibernate application based on a common business scenario Integrate Hibernate with other frameworks to develop robust enterprise applications In Detail Hibernate is a database independent technology, so the same code will work for all databases.

Style and approach This book is a practical guide filled with carefully organized step-by-step instructions. How it works There's more… Providing a hibernate configuration using the properties file How to do it… How it works… Configuring hibernate programmatically How to do it… How it works… 2.

Creating a criteria How to do it Scenario 1: Converting a result to List Scenario 2: Converting a result to Map Code Output Scenario 3: TM https: PacktLib is Packt's online digital book library.

Here, you can search, access, and read Packt's entire library of books. Why Subscribe? Simply use your login credentials for immediate access. Setting Up Hibernate 1 Introduction 1 Getting the required libraries for hibernate 3 Creating a hibernate persistent class 4 Providing an XML-based hibernate mapping 8 Providing an annotation-based hibernate mapping 12 Providing a hibernate coniguration using an XML ile 18 Providing a hibernate coniguration using the properties ile 20 Coniguring hibernate programmatically 22 Chapter 2: Understanding the Fundamentals 25 Introduction 26 Building a SessionFactory 26 Creating a generic SessionFactory provider class 28 Opening a new session 29 Opening a stateless session 31 Saving an object to the database 32 Fetching an object from the database 36 Removing an object from the database 42 Updating an object 44 Creating a criteria 46 Restricting the results using a criteria 47 Pagination using a criteria 50 Sorting the results 51 Transforming a result 53 Using basic projection 57 i www.

Basic Annotations 59 Introduction 59 Declaring a class as an entity and creating a table in the database — Entity and Table 60 Creating a column in the table — Column 62 Creating a primary key and composite primary key column — Id and IdClass 64 Creating an autogenerator column 65 Chapter 4: Working with Associations 97 Introduction 97 One-to-one mapping using foreign key association 98 One-to-one mapping using a common join table One-to-one mapping using a common primary key One-to-many mapping or many-to-one mapping Many-to-many mapping Chapter 6: When we go for relational data structures, we can perform any operation on the data using queries on the interface provided by the database vendor or using a third party tool.

The syntax for all databases is almost similar, but some databases follow their own syntax and semantics of writing a query. Nowadays, real-world applications require a quick development cycle, database-independent query execution, and a generic code that can be supported by multiple databases.

It's a very hard and time-consuming task for a software developer to fulill this set of requirements. Hibernate is an ORM Object Relational Mapping tool that helps us by making our development process faster and making the software development independent of the database; so, we can easily change a database vendor without worrying about the changes required in code.

Therefore, whether you are developing a standalone Java application or a server-side Java Enterprise application, you could use hibernate to make your code database-independent.

Java Hibernate Cookbook will help you to learn hibernate from the basics to an advanced level. In this book, we will try to create simple and short recipes to understand hibernate step by step.

What this book covers Chapter 1, Setting Up Hibernate, provides the basics of hibernate and the persistent class. Next, you will learn to obtain the required libraries, XML and annotation-based coniguration, and the mapping required for hibernate. Chapter 2, Understanding the Fundamentals, takes you through the basic objects required to start working with hibernate, such as SessionFactory, Session, Criteria, Projection, and so on.

Chapter 3, Basic Annotations, covers the very basic annotations that are useful and necessary while writing with hibernate, such as declaring table Table , declaring column Column , declaring primary key Id , and so on. Chapter 5, Working With Associations, helps you to understand relationships and associations such as one-to-one, one-to-many many-to-one , and many-to-many.

In this chapter, you will discover the simplest way to implement a relationship using hibernate. Chapter 6, Querying, applies the basics of hibernate to query a database. This chapter helps you to understand the fundamentals of hibernate such as alias, subquery, NamedQuery, formula, and HQL. Chapter 7, Advanced Concepts, helps you to learn the advanced concepts in hibernate such as caching, inheritance strategy, versioning, and maintaining the history of the objects.

It shows how to achieve a persistent life cycle in the frameworks.

What you need for this book Knowledge of the Java programming language is a must. A good knowledge and understanding of Java is preferred to allow an eficient programming of the core elements and applications. It would also be helpful if the readers are familiar with the basics of SQL.

To give clear instructions on how to complete a recipe, we use these sections as follows: Getting ready This section tells you what to expect in the recipe and describes how to set up any software or any other preliminary settings required for the recipe.

How to do it… This section contains the steps required to follow the recipe. How it works… This section usually consists of a detailed explanation of what happened in the previous section. There's more… This section consists of any additional information about the recipe in order to make the reader more knowledgeable about the recipe.

See also This section provides helpful links to other useful information for the recipe. Conventions In this book, you will ind a number of text styles that distinguish between different kinds of information. Here are some examples of these styles and an explanation of their meaning.

Code words in text, database table names, folder names, ilenames, ile extensions, pathnames, dummy URLs, user input, and Twitter handles are shown as follows: Tips and tricks appear like this. Reader feedback Feedback from our readers is always welcome. Let us know what you think about this book—what you liked or disliked. Reader feedback is important for us as it helps us develop titles that you will really get the most out of. To send us general feedback, simply e-mail feedback packtpub.

If there is a topic that you have expertise in and you are interested in either writing or contributing to a book, see our author guide at www. Downloading the example code You can download the example code iles from your account at http: If you purchased this book elsewhere, you can visit http: Errata Although we have taken every care to ensure the accuracy of our content, mistakes do happen.

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We appreciate your help in protecting our authors and our ability to bring you valuable content. Questions If you have a problem with any aspect of this book, you can contact us at questions packtpub. An essential part of the application is the hibernate coniguration. Through the coniguration, we can provide database information to the hibernate engine, such as the database host, port, username, password, the database name, the drive class, and so on.

In the older era of Java development, developers used some methodologies to persist data. To persist data means to save or store data in some storage medium by maintaining it in a certain state. Once the data is successfully persisted, it can be used at any given time. A database is the more preferable storage medium for a transactional operation. It works as a bridge between the application and database by simplifying the communication between them.

The beneits of the ORM framework are as follows: Hibernate supports multiple databases, so there is no need to write a database-speciic code. This is a useful feature of hibernate. If we used JDBC, we would need to write a database-speciic code as our database is changed. However, hibernate gets rid of the developer's headache by handling this issue.

The syntax of a query may be different for different database parameters; still, hibernate works in the same way for all types of databases.

Hibernate's term dialect helps achieve this type of functionality. The implementation of the dialect class is provided by the database provider to inform hibernate about the syntax of this particular database. Some useful features of hibernate are as follows: 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: 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. How to do it… Let's come back to the library section. Perform the following steps: Download the hibernate core distribution from http: Now, place all the iles in your classpath if you plan to run a standalone program and put them in the lib folder if it's a J2EE project.

When you manually download the libraries, it's the programmer's responsibility to get all the required and dependent JAR iles from the oficial site of hibernate; failing this, they will face errors.

Using Maven If you use the Maven project, it would get rid of your headache of inding all the JAR iles for hibernate and the dependent libraries.

You can use the following Maven coniguration for hibernate. Enter the following code into the pom. Creating a hibernate persistent class As discussed in the Preface, the developer will be dealing with objects at every step of development.

Java Hibernate Cookbook

Also, when we use hibernate, we don't need to work on a core SQL query. ID is used to identify the object and is mapped with the primary column of a table. We will now create a persistent class and name it Employee. The following table shows a representation of the Employee class: Employee id firstName salary 1.

Create the Employee. The preceding class now contains the following: Department Employee id id deptName firstName salary department The following code is the deinition for the Department class in Department.

Now we will consider how to create the coniguration for hibernate. There are multiple ways of mapping, and this is one of them. Generally, the coniguration provides the following information: Ensure that the basic structure of the coniguration ile is as follows: Create a XML ile and name it Employee. Then, add the coniguration, as shown in the following code: However, while developing, there is no strict rule regarding the naming convention. Another common practice we will use here is to create one hbm file for the module, map all the classes of this module in the same mapping file, and name this file modulename.

This denotes the database table used for the class deined in the name attribute. There are many types of built-in generators provided by hibernate, such as identity, sequence, hilo, and so on.

It contains the following attributes: This speciies the Java class attribute name f column: This denotes the database table's column name f type: This speciies the data type of the column that will help hibernate during the creation and retrieval of the automatic table f size: Usually, we create a mapping ile called hbm hibernate mapping.

This helps the hibernate engine to map the class to the table and the class ield to the table column, along with the given attributes. It is good practice to provide the type in mapping because if this attribute is not provided, hibernate needs to use relection to get the data type of the ield; relection requires a little more processing than a normal execution does. Here, we will create two different mapping iles. The following is a code that represents the mapping for the Department class.

The mapping is in the Department.

Its deinition is present in the Employee. This will refer to the department column in the employee table. This means that it will create a foreign key that is referenced to the department table.

The properties are as follows: This feature helps us while retrieving data using hibernate 11 www.

Java Hibernate Cookbook Book Description:

In our example, Employee is a parent class, whereas Department is a child of the Employee class. Now, while fetching, if we set lazy as true, it means that it will only fetch employee records. No child records will be fetched with Employee, and hibernate will use a separate query if we try to access a child record, which is employee. If we set lazy as false, hibernate will fetch the child records with the parent, which means that the department information will also be fetched, along with that of the employee.

Hibernate will use a join query to fetch the child records. Hibernate provides the annotations that we can directly write to the POJO, and we can provide all the mappings via the classes, which we can do using the previous XML ile. How to do it… 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: Represent the annotation-based mapping for the Employee class in Employee.

Column; import javax. Entity; import javax. GeneratedValue; import javax. Id; import javax. Declaring a class — Table for the database In the annotations, we will write the following code: This annotation declares the class as an entity bean.

We can set this annotation at the class level only. You can provide the name attribute, which is considered as a database table name. You can also just write Table without any attribute; in this case, the class name is considered as a table name by hibernate.

Declaring an ID — The primary key for the table In the annotations, we will write the following code: This annotation declares the property to be an identiier property, and this is used as a primary key for the table. This annotation is used to deine the column for the table. You can also write Column without any attributes; in this case, the property name is considered to be a column name for the table. Using this annotation, we can provide information to hibernate on how to generate a value for the primary key column.

AUTO, which means that hibernate uses the autoincrement value for the id column. If not provided, hibernate uses the most appropriate generation strategy. Referencing an object In the annotations, we will write the following code: This annotation notiies hibernate that this is a reference column.

This annotation deines the relation between the referenced tables. Here, we have used many-to-one, meaning that one department can be mapped with multiple employees. There's more… In the previous section you learned how to reference a class using hibernate. In this section, we will take a look at how to provide the reference of one class in another class in detail. Do not get confused when writing Employee. The following code represents the annotation-based mapping for the Employee class that has the reference ield in Employee.

ManyToOne; import javax.

These mappings show the relationship between the Java class and the database table. Still, hibernate requires some information about the database, host, and port, on which the application is running. It also requires information about the username and password to access the database. Hibernate uses this set of conigurations to connect to the database. This is a traditional way to provide the hibernate coniguration; however here, we need to create an XML ile, generally called hibernate.

There is no strict rule to name it hibernate. Otherwise, hibernate looks for the ile named hibernate. How to do it Enter the following code in hibernate. Here, we will take a look at only the basic coniguration parameters. Let's understand the meaning of each property: This property helps hibernate to generate database- speciic SQL statements.

This is an optional property. According to hibernate documentation, hibernate will be able to choose the correct implementation of dialect automatically using the JDBC metadata returned by the JDBC driver.

The driver class is implemented using Java and resides in the JAR ile and contains the driver that should be placed in our classpath. Using this property, we can provide the physical location of the database; however, the connection URL may vary from database to database. Using this property, we can provide the username to access a particular database. Using this property, we can provide the password to access a particular database. The possible value for this property is either true or false.

This is useful during basic troubleshooting. Hibernate will use the prepared statement so that it does not display the parameter in the output window. If you want to see this parameter as well, you will have to enable the detailed log. Log4j is preferred for the detailed log. The possible values are validate, update, create or create-drop. This is also an optional property. Do not use the hbm2ddl. So, it's best practice to avoid it in the production environment.

All of the mapping ile is declared in the mapping tag, and the mapping ile is always named xx. We can use multiple mapping tags for multiple mapping iles. Here is an example: Usually called hibernate. You can use any approach either cfg. However, the properties ile is better for startup, and it is the easiest approach to get started quickly.

Hibernate searches for the XML ile or the properties ile at startup to ind the coniguration in your classpath. We can use any one of these options. You can use both of them at the same time, but this is uncommon because hibernate gives priority to the XML ile over properties; the properties ile is simply ignored in such cases.

How to do it… Now, we will create a ile called hibernate. The following code represents hibernate.

MySQLDialect hibernate. Driver hibernate. If we use a. So, you can use this methodology when you use a programmatic coniguration. Hibernate also supports the programmatic coniguration. To conigure hibernate using this method, we have to work on a Java code and create an instance of the org.

Configuration class. There are multiple ways to conigure hibernate. How to do it… First, write the following code: Provide the following mapping iles to the coniguration: We can also set a custom property. To set up the custom property, use the following method: MySQLDialect" ; properties. Driver" ; properties. Using the instance of the Configuration class, we will build a SessionFactory object, as shown in the following code: In this chapter, we will cover the fundamentals of hibernate, such as SessionFactory, Session, and Criteria.

We will discuss the importance of SessionFactory in the hibernate application. Apart from this, we will cover some basic and useful functionalities, such as the sorting of results, limiting the number of rows, transforming a result, and the basics of projections. As the name suggests, a SessionFactory is a factory of sessions. A SessionFactory has the following features: A Session is used to get a physical connectivity with the database. How to do it… If you are using a version of hibernate that is earlier than 4, use the following code to create a SessionFactory: It actually creates the SessionFactory object using the coniguration loaded in Line 2.

For the second part of the code, do the same thing. In Line 4, apply all the settings that are loaded into the coniguration object. In the last line, Line 5, create an object of SessionFactory, the coniguration being set by the builder itself. There's more… If we want to connect two different databases in an application, we need to create two different SessionFactory objects in it.

Let's see how to do this. Then, we will just create a SessionFactory, as shown in the following code: Creating a generic SessionFactory provider class Now, we will create a helper class, which will help us to set and get SessionFactory on demand. We require SessionFactory at every point while working with hibernate. So, we will create a HibernateUtil. This is just a naming convention and not a hibernate standard but is used globally by developers and communities for the ease of use.

How to do it… Here, we will create a Java ile with the name HibernateUtil. Enter the following code in the HibernateUtil.

SessionFactory; import org. The content inside the static block is executed only once. Here, it initializes the object of SessionFactory at the start of the program, and you can use it until the program's termination.

You can get the previously initially created SessionFactory object using the getSessionFactory method. The main beneits of this method are the code's reusability and ease of use. From now onwards for all demos, we will invoke HibernateUtil. The shutdown method is used to close the sessionfactory. Once the close method is invoked using the sessionfactory object, it close all caches and connection pools and releases all the connections to the database. Opening a new session A Session is also known as an interface that is used to get a physical connectivity with a database.

Persistent objects always travel from the application to the database and vice versa only through the Session. Getting ready Before we create a Session object, we need to get an object such as a SessionFactory as a prerequisite: Use the following code to open a new session: Session openSession org.

Interceptor interceptor ; Session openSession java. Connection connection, org. Interceptor interceptor ; How it works… This will open a brand new Session for us. It opens the database connection when it is created and holds it until the session is closed. A Session created using these methods is not associated with any thread, so it's our responsibility to lush or close it once we are done with the database operation.

A Session is a bridge between the Java application and hibernate. A Session always tries to be in sync with the persistent store where all transactions are made.

A Session is always a part of irst-level cache; it caches all the objects that are transmitted through that particular session. All cached objects will be destroyed once this session is closed. Actually, opening a new Session for every database transaction is considered to be a good practice for a multithreaded application.

Let's look at how to do it: Enter the following code to get the current session from sessionFactory: For example, in a non-multithreaded environment, a Session is created when the main thread is started. It will close automatically once the SessionFactory is closed.

This will help us more in a non-multithreaded environment because it's faster than creating a new session each time. Opening a stateless session Basically, a stateless session is used to perform only one task. It does not take place in any type of cache. A cache is used to store the frequently used objects in the current context.

There are some cases where a stateless session is very useful; for example, if we are reading data from a ile and inserting it into the database, we don't need to cache that data further because this is a one-time operation.

Apart from this, a stateless session does not use dirty checking while performing a transactional operation. The collections, as well as hibernate's event model and interceptors, are ignored by a stateless session.

Prajapati Y., Ranapariya V. Java Hibernate Cookbook

It's the same as creating a session, but the method is different: Enter the following code to open a stateless session: In this recipe, we will look at how to save an object to the database. The equivalent SQL query is as follows: The following code shows how we can save an object to the database: Department saved, id: Employee saved, id: As hibernate used PreparedStatement to save the record, it shows queries such as this one.

If we want to see all the parameters set by hibernate, we have to conigure a logging framework in our application. Log4j is a widely used, easy to conigure, and easy to use framework.

To conigure Log4j, we need some JAR iles, which are easily available on the oficial site of Log4j, http: The Maven dependency for Log4j is as follows: The minimal content of ile should be as follows: Source ile: ConsoleAppender log4j. How it works… Here, we created a department object and saved it using a Session. Hibernate saved the record with id equal to 1; even though it is not provided by us via code, once we print the value of id ield, it shows up as 1.

Actually, the id ield is annotated with the GeneratedValue annotation, which acts as an autoincrement column, and the database returns a saved object back to hibernate; so, we get id with the value 1 here. Perform the following steps to save the records: Get the SessionFactory.

Open a new session. Begin a transaction. Create a department object. Save a department.

Create an employee object. Set the saved department object as an employee department. Save an employee. Commit the transaction. Close the session. Close the SessionFactory. There's more… In the preceding example, we saved the department irst and then the employee.

But this is just a sample case; in a working scenario, we cannot save the department every time. As we have a many-to-one relationship between department and employee, multiple employees can refer to a single department. So, we can use an already saved object, as shown in the following code: Here, we create the department object and set the value to 1 in the id ield.

While using this method, if the object is not found in the database against the passed value, hibernate throws an error related to the violation of the foreign key constraints. Fetching an object from the database Now we will take a look at how to fetch objects using a Session. Here, we will also see how to get only one record using the primary key column. We override a toString method in the Employee and Department classes so that it's easy to display the data within an object, as shown in the following code: Enter the following code to fetch an object of the employee type, where the id is 1: Employee id: Hibernate internally uses JDBC to execute this query.

Another thing that needs to be highlighted is that we used the Session. When you use the Session. NullPointerException while accessing a null object. There's more… Let's consider another method named load Now we will take a look at how to fetch data using the load The load method works in the following manner: This means that it returns the dummy object without hitting the database if the same object is found in a persistent state for the given identiier.

Let's take a look at some real-time scenarios. Scenario 1 The record is in the session cache when load is invoked. When load is invoked, it is directly loaded from the session; there is no need to hit the database.

Here, we can show that the Select query is executed only once. Scenario 2 The record is not in the session cache when load is invoked. When load is invoked, it also hits the database, because the requested Employee 2 object is not in the session cache.

Scenario 3 The record is neither in the session cache nor in the database when load is invoked. Exception in thread "main" org. No row with the given identifier exists: Employee 3] at org. Load tries to ind Employee 3 in the session cache, but it will not ind it there. So, it goes for the database and throws an org. ObjectNotFoundException error, because Employee 3 is not in the database either.

Removing an object from the database Now, we take a look at how to remove a record from the database. How to do it… Here, we are trying to remove an employee object having id equals 1. The SQL query executed to achieve the same result is as follows: Code Enter the following code to delete an object of the employee type, where id is 1: How it works… Here, the irst query is executed to get the record from the database for Employee 1, and the second query is used to delete Employee 1.

The delete Object object method is void, so it returns nothing.

Java Hibernate Cookbook

This method throws an error if the record does not exist in the database for the given identiier. Virtual and Augmented Reality. NET and C. Cyber Security. Full Stack.

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You don't have anything in your cart right now. 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.

This book will provide a useful hands-on guide to Hibernate to accomplish the development of a real-time Hibernate application. 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.

Yogesh Prajapati is a Java programmer. He has more than 4 years of experience in implementing enterprise web applications using J2EE technologies. In , Yogesh obtained a master's degree in computer application from Gujarat University, Gujarat, India.

Yogesh's expertise is not limited to a particular domain; he has worked with clients in the transportation, finance, and health care domains. Apart from this, he has had experience in GIS development and has also worked in the hospitality industry.

Yogesh has a blog, http: He is interested in contributing to open source technologies and is enthusiastic about building new products and services. You can follow Yogesh on his blog and on Linkedin at http: Vishal Ranapariya is a Java developer. He has more than 4 years of experience in implementing enterprise web applications using J2EE technology.

In , he obtained a master's degree in computer application from Gujarat University, Gujarat, India. Vishal has blogs at http: He is interested in contributing to open source technologies.

Vishal is enthusiastic about building new products and services. You can follow Vishal on his blog and on LinkedIn at https: Sign up to our emails for regular updates, bespoke offers, exclusive discounts and great free content. Log in. My Account. Log in to your account. Not yet a member? Register for an account and access leading-edge content on emerging technologies.Ravi Sharma is a software professional with over 12 years of experience, working with various companies such as Oracle, Yahoo, and Tier-1 Banks and in the mobile advertising sector.

Hibernate provides an in-built caching mechanism known as the irst-level cache L1 cache. So, we will try to get only this record and understand how Set works in our case: It shows how to achieve a persistent life cycle in the frameworks.

You can upgrade to the eBook version at www. Here, we will set the value of the hibernate. Enter the following code on your editor: EAGER is used in the code.

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