Hi,
I have some problems to map an entity that contains a Map association.
The problems is how it maps this association (the code of the classes that i
use is at the end of message) :
On the database i have 4 tables, class1, class2, class3 and class3_class2
that maps the association in the map but this last table has only 2 column:
the class3_id and the hm_id and there is no reference to Class1 that is the
key of the Map, there is not a column that indicates the MapKey id.
I tried using the @MapKey annotation but has no effect on this.
When i retrieve a stored Class3 object from the database and i look the
keys/values in the Map i see that the keys are the id of the Class2 object
stored in the Map, and the Class1 objects are ignored.
What is wrong with this ? Seems correct but maybe i miss something.
Thanks for the help.
Bye
These are the classes that i used for test:
// Class1
@Entity
public class Class1 {
private int id;
private String string;
protected Class1(){
}
public Class1(String string){
this.string = string;
}
/**
* @return the id
*/
@Id
@GeneratedValue
public int getId() {
return id;
}
/**
* @param id the id to set
*/
public void setId(int id) {
this.id = id;
}
/**
* @return the string
*/
public String getString() {
return string;
}
/**
* @param string the string to set
*/
public void setString(String string) {
this.string = string;
}
/* (non-Javadoc)
* @see java.lang.Object#equals(java.lang.Object)
*/
@Override
public boolean equals(Object obj) {
return string.equals(obj);
}
/* (non-Javadoc)
* @see java.lang.Object#hashCode()
*/
@Override
public int hashCode() {
return string.hashCode();
}
/* (non-Javadoc)
* @see java.lang.Object#toString()
*/
@Override
public String toString() {
return string;
}
}
// Class2
@Entity
public class Class2 {
private String string;
private int id;
protected Class2(){
}
public Class2(String string){
this.string = string;
}
/**
* @return the string
*/
public String getString() {
return string;
}
/**
* @param string the string to set
*/
public void setString(String string) {
this.string = string;
}
/**
* @return the id
*/
@Id
@GeneratedValue
public int getId() {
return id;
}
/**
* @param id the id to set
*/
public void setId(int id) {
this.id = id;
}
/* (non-Javadoc)
* @see java.lang.Object#equals(java.lang.Object)
*/
@Override
public boolean equals(Object obj) {
return string.equals(obj);
}
/* (non-Javadoc)
* @see java.lang.Object#hashCode()
*/
@Override
public int hashCode() {
return string.hashCode();
}
/* (non-Javadoc)
* @see java.lang.Object#toString()
*/
@Override
public String toString() {
return string;
}
}
// Class3
@Entity
public class Class3 {
private int id;
private Map<Class1,Class2> hm;
public Class3(){
hm = new HashMap<Class1,Class2>();
}
/**
* @return the id
*/
@Id
@GeneratedValue
public int getId() {
return id;
}
/**
* @param id the id to set
*/
public void setId(int id) {
this.id = id;
}
/**
* @return the hm
*/
@ManyToMany(cascade = CascadeType.ALL, fetch = FetchType.EAGER)
public Map<Class1, Class2> getHm() {
return hm;
}
/**
* @param hm the hm to set
*/
public void setHm(Map<Class1, Class2> hm) {
this.hm = hm;
}
public void add_key_value(Class1 c1, Class2 c2){
hm.put(c1, c2);
}
}
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