Writing Java Object (POJO)
In the tutorial we are developing web application that will enable the new
users to register online. Existing users can logon to the system. System
authenticates the user against the database and if the credentials provided by
user are correct then user is allowed to login to the system, otherwise
appropriate message is displayed.
Hibernate Mapping Class
We have only one table into the database and we need one POJO class and the
hibernate mapping file to map the login object to the database table. Here is
the code for "Login.hbm.xml" mapping file:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping
DTD//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping
auto-import="true" default-lazy="false">
<class name="roseindia.dao.hibernate.Login"
table="login" >
<id name="id"
type="java.lang.Integer"
column="id"
>
<generator
class="increment" />
</id>
<property
name="loginid"
type="java.lang.String"
column="loginid"
not-null="true"
unique="true"
length="20"
/>
<property
name="password"
type="java.lang.String"
column="password"
not-null="true"
length="20"
/>
<property
name="email"
type="java.lang.String"
column="email"
not-null="false"
length="30"
/>
<property
name="address"
type="java.lang.String"
column="address"
not-null="false"
length="60"
/>
<property
name="phno"
type="int"
column="phno"
not-null="false"
length="11"
/>
</class>
</hibernate-mapping>
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Above file should be present in the project\WEB-INF\src\java\roseindia\dao\hibernate
directory.
POJO Class
Here is the code of Login.java POJO class:
|
package roseindia.dao.hibernate;
import java.io.Serializable;
public class Login implements Serializable {
/** identifier field */
private Integer id;
/** persistent field */
private String loginid;
/** persistent field */
private String password;
/** persistent field */
private String email;
/** persistent field */
private String address;
/** persistent field */
private int phno;
/** full constructor */
public Login(Integer id, String loginid,
String password, String email,
String address, int phno) {
this.id = id;
this.loginid = loginid;
this.password = password;
this.address = address;
this.phno = phno;
this.email = email;
}
/** default constructor */
public Login() {
}
public Integer getId() {
return this.id;
}
public void setId(Integer id) {
this.id = id;
}
public String getLoginid() {
return this.loginid;
}
public void setLoginid(String loginid) {
this.loginid = loginid;
}
public String getPassword() {
return this.password;
}
public void setPassword(String password) {
this.password = password;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public int getPhno() {
return phno;
}
public void setPhno(int phno) {
this.phno = phno;
}
}
|
Save the above code into project\WEB-INF\src\java\roseindia\dao\hibernate
directory.
In this section we developed the POJO class and the mapping file for our
project.
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