In hibernate,There is property hibernate.hbm2ddl.auto for Relational Database.
The hibernate.hbm2ddl.auto option turns on automatic generation of database
schemas directly into the database.
In Relational Database we can use this property.
Is there any property in hibernate for MongoDB through which we can directly generate MongoDB schemas into Mongo server?
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Say I have a Customer Entity whose data is stored in a postgreSQL database. It has a OneToMany relationship with a Post Entity.
What if I wanted to store the posts as Documents in a mongoDB database? What configuration would I have to change besides setting up the two databases connectivity? How would I maintain the OneToMany relationship? Would customer_id have to be a field in the post Document?
Is there any way to create models from MongoDB Database like Loopback has model discovery to reverse engineer database schemas into model definitions.
Because mongoDB database model is flexible it is not possible or not practical to create data model from it. Let me explain it this way. In SQL we create tables and columns manually or programmatically which does not change overtime. On the other hand in mongoDB you do not need to create tables and fields, when you invoke insert function on mongodb the data is stored in document model structure, which can be change over time depending on the data submitted for the next insertion.
I am a beginner to MEAN stack,I have one doubt that if I want to use any database and schema in my app using mongoose .Is it important that the same database and schema should exist in mongo db before?
Mongodb is schema-less. In other words the schema lives in the application. So no separate schema definitely is required in Mongodb prior to using it. Both database and collection (schema) gets created on the fly while using it.
However if authentication is enabled in Mongodb, then the userid should have sufficient privilege to access the database and create collections within them.
I'm newbie in mongo database ,I want to know if can create database and tables with hibernate.hbm2ddl.auto values create,update,validate.I created Documents classes but Database didn't created.
Well, you cannot use the regular hibernate with NoSQL DBs like MongoDB. You can try Hibernate OGM or Morphia. Personally, I have used Morphia and it does it's job.
Morphia - https://github.com/mongodb/morphia
I assume you use Hibernate OGM to access MongoDB. In this case specify the following property to have the database automatically created:
hibernate.ogm.datastore.create_database=true
You can find a list with all available options in the reference guide. You also might be interested in issue OGM-571 which is about honoring the existing hbm2ddl setting.
I use doctrine ODM to persist and load documents from my Mongo DB. I followed this guide: https://doctrine-mongodb-odm.readthedocs.org/en/latest/tutorials/getting-started.html
Following this guide all documents get stored in the database "doctrine" by default. But what if I have my own database? How do I select the database? I couldn't find anything use in the documentation nor google.
you can use the Configuration class.
$config->setDefaultDB('mydbname');