Having problem with inserting data into table using hibernate

[Varun Nayudu]

Hi guys,

I am having trouble with adding data into the database using hibernate .I have got a table 'ln_user_group' which has 2 columns 'userid,groupname'. Both these fields act as a primary key

The Hibernate mapping file is as follows

<hibernate-mapping>
<class name="his1.User.LnUserGroup" table="ln_user_group" catalog="his1">
<composite-id name="id" class="his1.User.LnUserGroupId">
<key-property name="userid" type="string">
<column name="USERID" length="20" />
</key-property>
<key-property name="groupname" type="string">
<column name="GROUPNAME" length="20" />
</key-property>
</composite-id>
</class>
</hibernate-mapping>
<hibernate-mapping>
<class name="his1.User.LnUserGroup" table="ln_user_group" catalog="his1">
<composite-id name="id" class="his1.User.LnUserGroupId">
<key-property name="userid" type="string">
<column name="USERID" length="20" />
</key-property>
<key-property name="groupname" type="string">
<column name="GROUPNAME" length="20" />
</key-property>
</composite-id>
</class>
</hibernate-mapping>

I am using netbeansIDE and it automatically generates 2 POJO's of the table 'ln_user_group'

The 2 POJO's a given below..

public class LnUserGroup implements java.io.Serializable {
private LnUserGroupId id;
public LnUserGroup() {
}
public LnUserGroup(LnUserGroupId id) {
this.id = id;
}
public LnUserGroupId getId() {
return this.id;
}
public void setId(LnUserGroupId id) {
this.id = id;
}
}

And the other one is

public class LnUserGroupId implements java.io.Serializable {
private String userid;
private String groupname;
public LnUserGroupId() {
}
public LnUserGroupId(String userid, String groupname) {
this.userid = userid;
this.groupname = groupname;
}
public String getUserid() {
return this.userid;
}
public void setUserid(String userid) {
this.userid = userid;
}
public String getGroupname() {
return this.groupname;
}
public void setGroupname(String groupname) {
this.groupname = groupname;
}
public boolean equals(Object other) {
if ( (this == other ) ) return true;
if ( (other == null ) ) return false;
if ( !(other instanceof LnUserGroupId) ) return false;
LnUserGroupId castOther = ( LnUserGroupId ) other;
return ( (this.getUserid()==castOther.getUserid()) || ( this.getUserid()!=null && castOther.getUserid()!=null && this.getUserid().equals(castOther.getUserid()) ) )
&& ( (this.getGroupname()==castOther.getGroupname()) || ( this.getGroupname()!=null && castOther.getGroupname()!=null && this.getGroupname().equals(castOther.getGroupname()) ) );
}
public int hashCode() {
int result = 17;
result = 37 * result + ( getUserid() == null ? 0 : this.getUserid().hashCode() );
result = 37 * result + ( getGroupname() == null ? 0 : this.getGroupname().hashCode() );
return result;
}
}

Now i understand it creates 2 pojo's for generating a unique id , but i want to know how do i add data into this table 'ln_user_group'

My code for adding data into table is as follows:

LnUserGroup u = new LnUserGroup(); //Require a Check to see if it works or no!!!!!
u.getId().setGroupname(groupName);
u.getId().setUserid(userid);
session = NewHibernateUtil.getSessionFactory().getCurrentSession();
tx = session.beginTransaction();
session.save(u); System.out.println("Successfully ");
tx.commit();

but i don't thing it will work. Can any one please tell me the write way to add data into this table

[Arpit Purohit]

The approach to use given auto generated classes to add record should be as follows:

LnUserGroup u = new LnUserGroup(new LnUserGroupId(userid,groupName));
session = NewHibernateUtil.getSessionFactory().getCurrentSession();
tx = session.beginTransaction();
session.save(u);
System.out.println("Successfully ");
tx.commit();