Hibernate + PostgreSQL + Netværksadressetype (inet, cdir)

Jeg løser bare et problem som dit. Der er lidt information om denne sag. Som @ms03 sagde...bedre måde er at oprette en ny type og en klasse, som implementerer denne type og håndterer java-objektet til at indstille/komme på databasen.

Først på din enhed skal du angive typer for dine parametre.

@Entity
@Table(name="user_app")
@TypeDefs(value={@TypeDef(name="convertInet",typeClass=PgInetType.class),
         @TypeDef(name="convertMacaddr",typeClass=PgMacaddrType.class)})
public class User implements Serializable {

    //some parameters

  @Type(type="convertMacaddr")
  private PgMacaddr mac;

  @Type(type="convertInet")
  private PgInet ip;

     //getters and setters, equals, hashcode, toString
  }

For det andet skal du oprette det nye objekt, der håndteres til java, det skal have en standardkonstruktion, en konstruktion til at håndtere data fra DB og for at kunne seriariseres.

public class PgInet implements Serializable {

private static final long serialVersionUID = 1L;

private String address;

public PgInet(String address){
    this.address=address;
}

public PgInet(){
    this.address=null;
}

    //Getters,setters,hashcode, equal and toString
 }

Og sidste trin skal du oprette en brugerdefineret type

public class PgInetType implements UserType{

@Override
public int[] sqlTypes() {

            //Because inet,macaddr,cdir...and unkwon type for java, yo must
            // define Types.OTHER
    return new int[] { Types.OTHER };
}

@Override
public Class returnedClass() {

            //Object created to be handled for java
    return PgInet.class;
}

@Override
public boolean equals(Object x, Object y) throws HibernateException {
    return ObjectUtils.nullSafeEquals(x, y);
}

@Override
public int hashCode(Object x) throws HibernateException {
    if(x!=null)
        return x.hashCode();
    else
        return 0;
}

@Override
public Object nullSafeGet(ResultSet rs, String[] names,
        SessionImplementor session, Object owner)
        throws HibernateException, SQLException {

            //Translation from DB to Java
    PgInet address=null;

    String ip=rs.getString(names[0]);

    if(ip!=null){
        address=new PgInet(ip);
    }

    return address;
}

@Override
public void nullSafeSet(PreparedStatement st, Object value, int index,
        SessionImplementor session) throws HibernateException, SQLException {

    //Translation from java to DB

    if(value==null){
        st.setNull(index, Types.VARCHAR);
    }else{

                //As inet,macaddr,cdir...are new types object on Postgresql you must
                //create the specific postgresql object and to insert it

                //I created 2 new cast on postgresql: inet As varchar, varchar AS inet
                //but I think it's not neccesary because macaddr type works fine without
                //postgresl casting

        st.setObject(index, getInet(value, st.getConnection()));
    }

}

private Object getInet(Object value, Connection connection) {

           //Expected object on postgresql

       Object tempInet = null;
       ClassLoader connectionClassLoader = connection.getClass().getClassLoader();

       try {

           //Class which will create the postgresql

           Class aPGObjectClass =connectionClassLoader.loadClass("org.postgresql.util.PGobject");
           Constructor ct = aPGObjectClass.getConstructor(null);
           try {
            tempInet = ct.newInstance(null);
        } catch (InstantiationException | IllegalAccessException
                | IllegalArgumentException | InvocationTargetException e2) {
            // TODO Auto-generated catch block
            e2.printStackTrace();
        }

           Method setTypeMethod = aPGObjectClass.getMethod("setType", new Class[]{String.class});
           try {

               //Setting postgresql type, inet in this case

            setTypeMethod.invoke(tempInet, new Object[]{"inet"});
        } catch (IllegalAccessException | IllegalArgumentException
                | InvocationTargetException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }

           Method setValueMethod = aPGObjectClass.getMethod("setValue", new Class[]{String.class});
           try {
            setValueMethod.invoke(tempInet, new Object[]{value.toString()});
        } catch (IllegalAccessException | IllegalArgumentException
                | InvocationTargetException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

       } catch (ClassNotFoundException e) {

       } catch (NoSuchMethodException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (SecurityException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

       return tempInet;
   }

@Override
public Object deepCopy(Object value) throws HibernateException {
    if(value==null)
        return null;
    else{
        PgInet PgInetNew=new PgInet();
        PgInet PgInetOriginal=(PgInet)value;

        PgInetNew.setAddress(PgInetOriginal.getAddress());

        return PgInetNew;
    }
}

@Override
public boolean isMutable() {
    return false;
}

@Override
public Serializable disassemble(Object value) throws HibernateException {
     Object  deepCopy=deepCopy(value);

      if(!(deepCopy instanceof Serializable))
       return (Serializable)deepCopy;

      return null;
}

@Override
public Object assemble(Serializable cached, Object owner)
        throws HibernateException {
    return deepCopy(cached);
}

@Override
public Object replace(Object original, Object target, Object owner)
        throws HibernateException {
    return deepCopy(original);
}

 }

Denne måde fungerer fint for mig, når jeg indsætter eller henter en række fra DB.