Deploy script once for migrating data in MongoDB

Question

Situation: have two mongo DBs for project. Each document in DB contains _id and _class fields. After updates in a project I need change _class field in all documents. That is some kind of migration.

I'm thinking about implementing this migration script into WEB part of the project, while deploying script should update all documents.

Info:

1) Script should run only once during deploying.

2) I'm using Spring data framework

Question: I have no clue how to run migration script only once. Is it possible to do using Spring framework? And what is most efficient way to do it?

Why not build a script using Javascript and run directly on server? — Miguel Cartagena
– Miguel Cartagena, Commented Aug 12, 2013 at 12:58
_class - defined from config file, and diffident by customer. — Lugaru
– Lugaru, Commented Aug 12, 2013 at 13:06

Harmeet Singh Taara · Accepted Answer · 2013-08-12 13:18:18Z

2

In MongoDb, there is update() function that is used to Update the data in document. This is overloaded function , you pass the criteria for update all values or some selected values according to criteria.

answered Aug 12, 2013 at 13:18

Harmeet Singh Taara

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2 Comments

Lugaru Over a year ago

but how I can make my script run only once while deploying?

Harmeet Singh Taara Over a year ago

It depends on you, at what time you want to migrate database or update data. If you want to run the script one time, create an independent script from project, and before running project firstly run the script for migrating database or update data in database.

Lugaru · Accepted Answer · 2013-08-12 14:34:55Z

0

After some time of experiments found way how to run my code for updating DB once, while project deploying.

Simply the idea to use @Component annotation from spring framework.

Class looks looks this:

@Component
public class MongoUpdate {
    /**
     * Constructor.
     */
    public MongoUpdate() {

        try {
                // Code to update mongo here
            }

        } catch (MongoException ex) {

        } catch (UnknownHostException ex) {

        }

    }
}

answered Aug 12, 2013 at 14:34

Lugaru

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