How do map one-to-many properly?
I have a scenario, which is very easy: Gender 1 --- * Singer
So in Singer class, I have a Gender object where in Gender class, I have list of Singer objects. Here are the source codes:
public class Gender implements Serializable {
private long id;
private String type;
private String description;
private List singer;
public Gender() {
super();
// TODO Auto-generated constructor stub
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public List getSinger() {
return singer;
}
public void setSinger(List singer) {
this.singer = singer;
}
}
public class Singer implements Serializable {
private long id;
private String firstname;
private String lastname;
private Gender gender;
public Singer() {
super();
// TODO Auto-generated constructor stub
}
public String getFirstname() {
return firstname;
}
public void setFirstname(String firstname) {
this.firstname = firstname;
}
public Gender getGender() {
return gender;
}
public void setGender(Gender gender) {
this.gender = gender;
}
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public String getLastname() {
return lastname;
}
public void setLastname(String lastname) {
this.lastname = lastname;
}
}
These are their mapping files:
<hibernate-mapping> <class name="net.andyleung.multimedia.mp3.entity.Gender" table="gender"> <id name="id" column="id"> <generator class="native"/> </id> <property name="description" column="description" /> <property name="type" column="type" /> <list name="singer"> <key column="id" not-null="true"/> <list-index column="gender"/> <one-to-many class="Singer"/> </list> </class> </hibernate-mapping>
<hibernate-mapping> <class name="net.andyleung.multimedia.mp3.entity.Singer" table="singer"> <id name="id" column="id"> <generator class="native"/> </id> <property name="firstname"/> <property name="lastname"/> <many-to-one name="gender" class="Gender" column="gender" not-null="true" update="false" insert="false"/> <!-- <many-to-one name="country" class="Country" column="country" not-null="true" update="false" insert="false"/> <list name="album"> <key column="singer" not-null="true"/> <list-index column="singer"/> <one-to-many class="Album"/> </list>--> </class> </hibernate-mapping>
But somehow it says my Singer is mapping incorrectly. Any clue?
Thanks.