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Hibernate

Notes for Professionals

of professional hints and tricks

30+ pages

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Disclaimer

This is an unocial free book created for educational purposes and is

not aliated with ocial Hibernate group(s) or company(s).

All trademarks and registered trademarks are

the property of their respective owners

Contents

About

................................................................................................................................................................................... 1

Chapter 1: Getting started with Hibernate

...................................................................................................... 2

Section 1.1: Using XML Conﬁguration to set up Hibernate

......................................................................................... 2

Section 1.2: Simple Hibernate example using XML

..................................................................................................... 4

Section 1.3: XML-less Hibernate conﬁguration

........................................................................................................... 6

Chapter 2: Fetching in Hibernate

.......................................................................................................................... 8

Section 2.1: It is recommended to use FetchType.LAZY. Join fetch the columns when they are needed

.................................................................................................................................................................................. 8

Chapter 3: Hibernate Entity Relationships using Annotations

............................................................ 10

Section 3.1: Bi-Directional Many to Many using user managed join table object

................................................ 10

Section 3.2: Bi-Directional Many to Many using Hibernate managed join table

.................................................. 11

Section 3.3: Bi-directional One to Many Relationship using foreign key mapping

.............................................. 12

Section 3.4: Bi-Directional One to One Relationship managed by Foo.class

....................................................... 12

Section 3.5: Uni-Directional One to Many Relationship using user managed join table

..................................... 13

Section 3.6: Uni-directional One to One Relationship

.............................................................................................. 14

Chapter 4: HQL

............................................................................................................................................................ 15

Section 4.1: Selecting a whole table

........................................................................................................................... 15

Section 4.2: Select speciﬁc columns

.......................................................................................................................... 15

Section 4.3: Include a Where clause

.......................................................................................................................... 15

Section 4.4: Join

........................................................................................................................................................... 15

Chapter 5: Native SQL Queries

............................................................................................................................ 16

Section 5.1: Simple Query

........................................................................................................................................... 16

Section 5.2: Example to get a unique result

............................................................................................................. 16

Chapter 6: Mapping associations

....................................................................................................................... 17

Section 6.1: One to One Hibernate Mapping

............................................................................................................. 17

Chapter 7: Criterias and Projections

................................................................................................................ 19

Section 7.1: Use Filters

................................................................................................................................................. 19

Section 7.2: List using Restrictions

............................................................................................................................. 20

Section 7.3: Using Projections

.................................................................................................................................... 20

Chapter 8: Custom Naming Strategy

............................................................................................................... 21

Section 8.1: Creating and Using a Custom ImplicitNamingStrategy

...................................................................... 21

Section 8.2: Custom Physical Naming Strategy

....................................................................................................... 21

Chapter 9: Caching

..................................................................................................................................................... 24

Section 9.1: Enabling Hibernate Caching in WildFly

................................................................................................. 24

Chapter 10: Association Mappings between Entities

................................................................................ 25

Section 10.1: One to many association using XML

................................................................................................... 25

Section 10.2: OneToMany association

....................................................................................................................... 27

Chapter 11: Lazy Loading vs Eager Loading

................................................................................................. 28

Section 11.1: Lazy Loading vs Eager Loading

............................................................................................................ 28

Section 11.2: Scope

....................................................................................................................................................... 29

Chapter 12: Enable/Disable SQL log

................................................................................................................. 31

Section 12.1: Using a logging conﬁg ﬁle

.................................................................................................................... 31

Section 12.2: Using Hibernate properties

.................................................................................................................. 31

Section 12.3: Enable/Disable SQL log in debug

........................................................................................................ 31

Chapter 13: Hibernate and JPA

............................................................................................................................ 33

Section 13.1: Relationship between Hibernate and JPA

........................................................................................... 33

Chapter 14: Performance tuning

........................................................................................................................ 34

Section 14.1: Use composition instead of inheritance

.............................................................................................. 34

Credits

.............................................................................................................................................................................. 35

You may also like

........................................................................................................................................................ 36

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Hibernate Notes for Professionals

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GoalKicker.com – Hibernate Notes for Professionals

Chapter 1: Getting started with Hibernate

Version

Documentation Link

Release Date

4.2.0

http://hibernate.org/orm/documentation/4.2/

2013-03-01

4.3.0

5.0.0

http://hibernate.org/orm/documentation/4.3/

2013-12-01

http://hibernate.org/orm/documentation/5.0/

2015-09-01

Section 1.1: Using XML Conﬁguration to set up Hibernate

I create a ﬁle called

database-servlet.xml

somewhere on the classpath.

Initially your conﬁg ﬁle will look like this:

<?xml

version="1.0" encoding="UTF-8"?>

<beans

xmlns="http://www.springframework.org/schema/beans"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xmlns:jdbc="http://www.springframework.org/schema/jdbc"

xmlns:tx="http://www.springframework.org/schema/tx"

xsi:schemaLocation="http://www.springframework.org/schema/beans

http://www.springframework.org/schema/beans/spring-beans-3.2.xsd

http://www.springframework.org/schema/jdbc

http://www.springframework.org/schema/jdbc/spring-jdbc-3.2.xsd

http://www.springframework.org/schema/tx

http://www.springframework.org/schema/tx/spring-tx-3.2.xsd">

</beans>

You'll notice I imported the

and

jdbc

Spring namespaces. This is because we are going to use them quite heavily

in this conﬁg ﬁle.

First thing you want to do is enable annotation based transaction management (

@Transactional

). The main reason

that people use Hibernate in Spring is because Spring will manage all your transactions for you. Add the following

line to your conﬁguration ﬁle:

<tx:annotation-driven />

We need to create a data source. The data source is basically the database that Hibernate is going to use to persist

your objects. Generally one transaction manager will have one data source. If you want Hibernate to talk to multiple

data sources then you have multiple transaction managers.

<bean

id="dataSource"

class="org.springframework.jdbc.datasource.DriverManagerDataSource">

<property

name="driverClassName" value=""

<property

name="url" value=""

<property

name="username" value=""

<property

name="password" value=""

</bean>

The class of this bean can be anything that implements

javax.sql.DataSource

so you could write your own. This

example class is provided by Spring, but doesn't have its own thread pool. A popular alternative is the Apache

Commons

org.apache.commons.dbcp.BasicDataSource

, but there are many others. I'll explain each of the

properties below:

driverClassName:

The path to your JDBC driver. This is a

database speciﬁc

JAR that should be available on

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