Esta información fue provista por un amigo mío y del blog, Lucas Acosta
Cuando usamos Enum y tenemos que guardar con hibérnate podemos hacer lo que sugiere la documentación de hibérnate:
Podemos guardar nuestro Enum en una columna como varchar:
import java.io.Serializable;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Types;
import org.hibernate.HibernateException;
import org.hibernate.usertype.UserType;
public class EnumUserType<E extends Enum<E>> implements UserType {
private Class<E> clazz = null;
protected EnumUserType(Class<E> c) {
this.clazz = c;
}
private static final int[] SQL_TYPES = {Types.VARCHAR};
public int[] sqlTypes() {
return SQL_TYPES;
}
public Class returnedClass() {
return clazz;
}
public Object nullSafeGet(ResultSet resultSet, String[] names, Object owner) throws HibernateException, SQLException {
String name = resultSet.getString(names[0]);
E result = null;
if (!resultSet.wasNull()) {
result = Enum.valueOf(clazz, name);
}
return result;
}
public void nullSafeSet(PreparedStatement preparedStatement, Object value, int index) throws HibernateException, SQLException {
if (null == value) {
preparedStatement.setNull(index, Types.VARCHAR);
} else {
preparedStatement.setString(index, ((Enum)value).name());
}
}
public Object deepCopy(Object value) throws HibernateException{
return value;
}
public boolean isMutable() {
return false;
}
public Object assemble(Serializable cached, Object owner) throws HibernateException
return cached;
}
public Serializable disassemble(Object value) throws HibernateException {
return (Serializable)value;
}
public Object replace(Object original, Object target, Object owner) throws HibernateException {
return original;
}
public int hashCode(Object x) throws HibernateException {
return x.hashCode();
}
public boolean equals(Object x, Object y) throws HibernateException {
if (x == y)
return true;
if (null == x || null == y) return false;
return x.equals(y);
}
}
Supongamos que tenemos este Enum:
public enum MyEnum {
ENUM_A, ENUM_B;
}
Hacemos el userType :
public class MyEnumUserType extends EnumUserType<MyEnum> {
public MyEnumUserType() {
super(MyEnum.class);
}
}
Y Por ultimo mapeamos:
<property name="sample" type="mypackage.MyEnumUserType" not-null="true"/>
