Hibernate hello world example eclipse
Step 1: Download the hibernate 3.6 final distribution.
Click to download Hibernate 3.6 final distribution download.
Step 2: Required jar files are,
required library files for hibernate
Step 3: Create a Java project in the eclipse and Create a registration configuration xml file inside src folder (which has the connection information like url, username password etc…)
Create a file named “registration.cfg.xml” and paste the below code,
Note: Filename can be anything but extension must be .cfg.xml.
[xml]
<?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>
<!– Database connection configurations –>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/signup</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.connection.password"></property>
<!– Making autocommit false –>
<property name="hibernate.connection.autocommit">false</property>
<!– Displaying sql queries when running the program –>
<property name="show_sql">true</property>
<property name="format_sql">true</property>
<property name="use_sql_comments">true</property>
<!– For JDBC connections –>
<property name="hibernate.transaction.factory_class">org.hibernate.transaction.JDBCTransactionFactory</property>
<!– Mapping file –>
<mapping resource="registration.hbm.xml"/>
</session-factory>
</hibernate-configuration>
[/xml]
Note: Url, Username Password and dialect informations are available for all the databases in the configuration file which is in “project -> etc (contains all the properties of all databases)” of hibernate 3.6 distribution final folder (which is downloaded in step 1).
Step 4: Create a table with this attribute in mysql,
username(varchar) 20 primary key, email(varchar) 30, password (varchar) 20
Step 5: Create a Pojo class (Registration) for table attributes (username, email and password) and paste the below code,
[java]
public class Registration {
public Registration(){}
private String userName;
private String emailId;
private String password;
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getEmailId() {
return emailId;
}
public void setEmailId(String emailId) {
this.emailId = emailId;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}
[/java]
Step 6: Create a mapping xml file which map the column and the attribute of the above Pojo class (setter and getter).
Create a file named “registration.hbm.xml” and paste the below code,
Note: File name can be anything, but extension must be .hbm.xml
[xml]
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="Registration" table="Registration">
<id name="userName" column="USERNAME" type="string">
<generator class="assigned"></generator>
</id>
<property name="emailId" column="EMAILID" type="string"></property>
<property name="password" column="PASSWORD" type="string"></property>
</class>
</hibernate-mapping>
[/xml]
Copy the doctype(3rd line) from the file (project -> core ->source ->main ->resources -> org ->hibernate ->(mapping file)) for the above mapping file, it is not a mandatory one, to ensure the things right we can do this.
Step 7: Create a business class named “RegisterDetails” and paste the below code,
[java]
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
public class RegisterDetails {
/**
* @param args
*/
public static void main(String[] args) {
Configuration cfg = new Configuration();
cfg.configure("registration.cfg.xml");
SessionFactory sf = cfg.buildSessionFactory();
Session s = sf.openSession();
Transaction tx = s.beginTransaction();
Registration reg = new Registration();
reg.setUserName("naveendra1");
reg.setEmailId("test@ngdeveloper.com");
reg.setPassword("test@123");
s.save(reg);
s.flush();
tx.commit();
s.close();
}
}
[/java]
Run the program and the values are inserted into the db and the query will be displayed in the console.
Output:
Hibernate:
/* insert Registration
*/ insert
into
Registration
(EMAILID, PASSWORD, USERNAME)
values
(?, ?, ?)
Easy Understand :
- Hibernate configuraion xml file which is to hold the connection details such as url, username, password, dialect(to generate queries) and driver class details.
- Pojo class for the required attributes.
- Hibernate mapping xml file to map the pojo class attributes with the table columns.
- Business class to write the business code, we have written value insertion details here.
Download the Source Code: