Question

Hibernate annotations : A problem with enumerations

Asked by: The_Poet

Hibernate version: 3.2.2

Mapping documents: Use of Annotations

Name of the database you are using: Oracle

Hi all,

I have a class that holds a status.
This Status has been implemented as an Enum class.

I wanted to map this as a "out of the box" String enumeration but after declaring the property with the following annotation :
@Enumerated(EnumType.STRING) : I get no string in my DB, I've tried to set the column to NVARCHAR2 but I just get one long string of characters as value...

What am i doing wrong here ?
In short, I just made a class A that extends from Enum and a class B that holds a property of type A mapped as stated above...

Or is there a smarter way to map Enumerations ?

Thx in advance.

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Asked On
2007-06-18 at 23:54:38ID22642460
Tags

hibernate

,

enum

,

annotation

Topics

J2EE Frameworks

,

Databases Miscellaneous

,

New to Java Programming

Participating Experts
1
Points
125
Comments
7

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Answers

 

by: dejanpazinPosted on 2007-06-19 at 07:51:55ID: 19316344


So, if I understend correctly, you have something like this:

public enum A{
    STATE1,
    STATE2,
    STATE3
}

@Entity
public class B{
  private A state;

 @Enumerated(EnumType.STRING)
    public A getState() {
        return state;
    }
    public void setState(A state){
       this.state = state;
   }
}

If this is it, then can you please describe more about what exactly is wrong.


 

by: The_PoetPosted on 2007-06-19 at 08:00:29ID: 19316450

correct, that is more or less what I have.

public enum A{
    STATE1 value "A",
    STATE2 value "B",
    STATE3 value "C"
}

I've added this pseudo code to indicate the values of my enum (the name)
I want these values (A, B, C) to be found in the database (the name value of the enums)

Hibernate creates the database itself (through annotations) and makes a column in oracle of type RAW.
In this column I can find my enumtype object (is this what they mean with enum ordinal ?) ... instead of the string "A", "B" or "C" that I expect to see.

I need this string value to allow my end-users to query on the database without having any knowledge on the inner workings of the program.

I've tried to change the column type to NVARCHAR(255) but that didn't get me anywhere either. Just gave me data-truncations (304 -> 255 lenght).

Hope this helps ?

 

by: dejanpazinPosted on 2007-06-19 at 08:12:59ID: 19316587


Try adding Column annotation to the getter:

@Enumerated(EnumType.STRING)
@Column(length = 1)
    public A getState() {
        return state;
    }

If that doesnt work, also check the columnDefinition parameter of the Column annotation.

Be sure to always create database from scratch.




 

by: dejanpazinPosted on 2007-06-19 at 08:14:18ID: 19316602


In my case, the above settings simply create a table, which has a string column (never tried on Oracle though)

20120131-EE-VQP-002

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