Harsh Kotadiya Harsh Kotadiya - 10 months ago 120
JSON Question

convert mongoDB Collection to mySQL Database

I was created my project in spring 4 MVC + Hibernate with MongoDB. now, I have to convert it into the Hibernate with MySQL. my problem is I have too many collections in MongoDB the format of bson and json. how can I convert that file into MySQL table format? is that possible?

Answer Source

The documents in your MongoDB collections represent serialised forms of some classes (POJOs, domain object etc) in your project. Presumably, you read this data from MongoDB deserialise it into its class form and use it in your project e.g. display it to end users, use it in calculations, generate reports from it etc.

Now, you'd prefer to host that data in MySQL so you'd like to know how to migrate the data from MongoDB to MySQL but since the persistent formats are radically different you are wondering how to do that.

Here are two options:

  • Use your application code to read the data from MongoDB, deserialise it into your classes and then write that data into MySQL using JDBC or an ORM mapping layer etc.
  • Use mongoexport to export the data from MongoDB (in JSON format) and then write some kind of adapter which is capable of mapping this data into the desired format for your MySQL data model.

The non functionals (especially for the read and write aspects) will differ between these approaches but fundamentally both approaches are quite similar; they both (1) read from MongoDB; (2) map the document data to the relational model; (3) write the mapped data into MySQL. The trickiest aspect of this flow is no. 2 and since only you understand your data and your relational model there is no tool which can magically do this for you.

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