Mongodb compass create new database8/5/2023 ![]() Db refers to the currently connected database. ![]() Then use db.Employee.insert command to add a document to the database: If the insertion is successful it will return WriteResult():įirst, switch to the database to add values using the ‘use’ command. So, the command to insert one document to our database will look like this: db.Employee.insert( Let’s create a collection called Employee and add a document to it.īefore you could create a collection, remember that you add data to documents in JSON format. That means that one document can be completely different from another document. These collections don’t have any structure, and you insert data, as documents, into the collection. In contrast, NoSQL has collections instead of tables. Every record you insert should have values (including null values) for every column defined on the table. In SQL, you have tables that have a well-defined structure with columns and specified data types. So, let’s see how you work with collections in MongoDB. Instead of tables and rows in SQL, MongoDB has collections and documents. That means you don’t specify a structure for the databases/tables as you do in SQL. One of the critical features in NoSQL databases like MongoDB is that they are schema-less-there’s no schema. This is because MongoDB doesn’t truly create the database until we save values to it. Surprisingly, the database we just created is not listed. Installing MongoDB creates three default databases: You can do it with the show dbs command, and it will return the following result: You might want to see all the existing databases before creating a new database. You can use the db command to confirm, which will display the currently connected database. Mongo has created the company database and connected you to it. When you use the command, you will see the following output: Let’s use the ‘use’ command to create our database. However, if there is no database as Employee, the command ‘use’ will create it and connects you to it. For example, if you want to connect with an existing database named Employee, you can use the command ‘use Employee’ to connect with it. MongoDB has a keyword called ‘use,’ which is used to switch to a specified database. Let’s see how, by creating a database called Company using the shell. It doesn’t mean there is no way to create a database-of course there is. Now you are in the MongoDB shell, where you can execute commands to:Īs I said earlier, there is no ‘create database’ command in MongoDB. To do that, type the command mongo in the CMD. If you get this output, the MongoDB server has successfully started: ![]() In order to get access to the mongo shell, you have to start the server with the following command: net start MongoDB You can use it to give commands to the MySQL server. When you install MongoDB, a CLI tool called Mongo shell will be installed along with it. If you get an output similar to the result in the picture below, everything is perfect. Open your CMD and type mongod –version to verify your installation. I assume now you have installed the MongoDB database successfully. (I am not going to describe the installation process in detail, as it is straightforward.) Download the msi/zip file compatible with your OS and install the application. Download the MongoDB package suitable for your OS. If you haven’t installed MongoDB yet, let’s do it first. Use the right-hand menu to navigate.) Installing MongoDB (This article is part of our MongoDB Guide. So, in this article, let’s explore how to work with databases in MongoDB. Surprisingly, however, MongoDB doesn’t have a ‘create database’ operation to create a database as you do in SQL. If you are coming from an RDBMS background, you will be quite comfortable with this topic. That means the way we work in MongoDB is different from that of a relational database like MySQL.
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