By Othmane Lamrani · May 17, 2022 · 8 min read
Do you want to connect MongoDB to PostgreSQL?
There are many reasons why you might want to do this, including:
When connecting the two, PostgreSQL will act as a central point for data management and extraction. This can be useful when working on a team of developers and designers. Alternatively, it may be overkill for such a small project.
This article will guide you through how to connect MongoDB to PostgreSQL with two different methods.
MongoDB is a document-oriented database that provides high performance, high availability, and automatic scaling.
It stores data as JSON documents, making it easier for developers to store and retrieve data.
MongoDB is a popular NoSQL database that many companies have adopted due to its flexibility and scalability.
The following are some of the main features of MongoDB:
PostgreSQL is an open-source relational database management system (RDBMS). It was developed at the University of California, Berkeley, and released in 1996, but it is still actively maintained and developed by its community.
PostgreSQL has a number of features that make it more powerful than other open-source databases:
This table summarizes the main differences between MongoDB and PostgreSQL.
The manual process includes the three following steps:
We’ll start by creating a CSV file from an existing Mongo collection with the mongoexport command.
Let’s understand this process with an example.
mongoexport --host localhost --db purchasetdb --collection purchases --type=csv --out puchases.csv --fields orderid,orderamount,customerid, quantity,description
The database is called purchasedb and the collection name is purchases.
The expected output file is purchases.csv.
The names of the keys that will be exported to CSV will be in the last attribute fields.
This is critical since MongoDB does not maintain a rigid key structure, and it is extremely likely that not all keys will be present in all documents.
The developer must verify that the keys that must be present in the CSV file are defined.
Mongoexport will not produce an error if there is no such key in the document.
It will simply insert a blank value into that column.
If you’re not careful, this can have unintended consequences.
CREATE TABLE purchases ( id SERIAL PRIMARY KEY, orderid VARCHAR NOT NULL, orderamount VARCHAR NOT NULL, customerid VARCHAR NOT NULL, quantity VARCHAR NOT NULL, description VARCHAR NOT NULL )
COPY purchases(orderid,orderamount,customerid, quantity,description) FROM 'C:globalpurchases.csv' DELIMITER ',' CSV HEADER;
This completes the process.
These steps may seem simple, but keep in mind that this is a very simplified version of the actual data migration issue.
MongoDB and PostgreSQL are very different databases and there are many factors that can cause unexpected failures in this migration.
Let’s look at some cases where problems can occur when using the above approach.
The manual ETL process is not an efficient solution for integrating MongoDB and PostgreSQL.
It is time-consuming, expensive, and error-prone.
Here are the main limitations of Manual ETL Process to Set Up MongoDB to PostgreSQL Integration:
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Access to ready-to-use connectors to save time and pain in building them from scratch: Database, data warehouse, business apps, SFTP, GDrive…
The steps to load data from MongoDB to PostgreSQL using RestApp are as follows:
RestApp offers built-in MongoDB and PostgreSQL integrations that quickly connect to your account.
In the output section, you have 3 choices of syncing:
You’ve now successfully set up RestApp’s MongoDB to PostgreSQL integration!
You can now model and sync your data with a Drag-and-Drop Editor (NoSQL, SQL, and Python built-in functions).
You can also activate your pipeline through a scheduler to operationalize your data with automation.
In this example, the pipeline will be automatically synchronized every hour.
You also have access to the logs to verify the authenticity of the automation:
In this article, I introduced you to MongoDB and PostgreSQL and explained their features.
We also described two methods you can use to set up MongoDB and PostgreSQL integration.
The manual method is effective, but it requires a lot of time and resources. Migrating data from MongoDB to PostgreSQL is a tedious and time-consuming process, but data integration tools like RestApp make this process easy and time-saving.
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