How to store object in sqlite database?

Question

Is it possible to store user defined objects in a SQLite database from Android? For example: I am creating one class and I want to store that class object in the database. Is it possible? If it is, how to proceed? On the Blackberry platform, I am able to store objects directly in persistent objects. Is it possible to do this with SQLite and Android?

score 24 · Answer 1 · edited Apr 14 '13 at 11:11

24

You'll need to be able to serialize your object into a byte stream and then recreate your object from a byte stream.

Then, just store that byte stream in your db.

EDIT: Read this article to learn about serialization in Java. It caters to the subject in a much better way than I would be able to by just giving some code snippets.

edited Apr 14 '13 at 11:11

Lennart

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answered Aug 07 '09 at 07:05

Prashast

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can u pls provide me some code snippet to do serialization of object. – Kumar Aug 11 '09 at 03:55
I edited the answer and give a link to an article which teaches you how to do object serialization. – Prashast Aug 11 '09 at 05:28
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link leads to Oracle Java start page that has no information about serialization – Budda Oct 28 '12 at 13:59
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Link rot. A little more detail would've been better! – Anirudh Ramanathan Oct 28 '12 at 20:20
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I was under the impression, that SQLite actually serves the purpose of quickly storing objects in a DB. I've used it for exactly that purpose in other applications. Is it really so, that we can't use SQLite like you'd use it in non-Android apps? Why use SQLite at all on Andorid then, if you have to do SQL Statements anyway? I don't get it. Why did they include SQLite then? – Zelphir Kaltstahl Nov 29 '15 at 18:10
The link appears to be dead and no longer go anywhere. Says page not found when visited for me in 2023. – BlueSquare23 Feb 18 '23 at 06:16

SohailAziz · Answer 2 · 2014-06-03T13:36:27.703

6

Instead of storing them in SQLite why not store them in db4o, which is specifically designed for storing objects. A simple tutorial for sotring objects using db4o.

edited Jun 03 '14 at 13:36

answered May 09 '12 at 04:17

SohailAziz

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DB4O is great in principle. It's super easy to use. BUT unfortunately it has many bugs and development/maintenance seems to have completely stopped. Very sad situation. – Matthias Jan 17 '14 at 13:33

score 6 · Answer 3 · answered Apr 03 '19 at 04:35

Use this code to convert your object to byte array and store it in your database as "BLOB"

public byte[] makebyte(Dataobject modeldata) {
            try {

                ByteArrayOutputStream baos = new ByteArrayOutputStream();
                ObjectOutputStream oos = new ObjectOutputStream(baos);
                oos.writeObject(modeldata);
                byte[] employeeAsBytes = baos.toByteArray();
                ByteArrayInputStream bais = new ByteArrayInputStream(employeeAsBytes);
                return employeeAsBytes;
            } catch (IOException e) {
                e.printStackTrace();
            }

            return null;
        }

Use this code to convert your byte array to your object again

public Dataobject read(byte[] data) {
    try {


        ByteArrayInputStream baip = new ByteArrayInputStream(data);
        ObjectInputStream ois = new ObjectInputStream(baip);
        Dataobject dataobj = (Dataobject ) ois.readObject();
        return dataobj ;

    } catch (IOException e) {
        e.printStackTrace();
    } catch (ClassNotFoundException e) {
        e.printStackTrace();
    }
    return null;
}

How to store object in sqlite database?

3 Answers3

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