How to run PostgreSQL queries from GoLand

Step 1. Clone files from repositories

For example purposes, we are going to use the following two repositories: Sakila dump files (https://github.com/DataGrip/dumps) and Docker-compose files (https://github.com/DataGrip/datagrip-documentation ). Sakila repository includes scripts that generate the structure of the Sakila database and scripts that add data to database objects. Docker repository includes YAML files that define services, networks, and volumes.

Enable version control integration

Click VCS | Enable Version Control Integration.
In the Enable Version Control Integration dialog, ensure that Git is selected in the drop-down list and click OK.

Clone repositories

Click Git | Clone.
In the URL field, copy and paste the following web URL:
- Sakila dump files:
  https://github.com/DataGrip/dumps.git
- Docker-compose files:
  https://github.com/DataGrip/datagrip-documentation.git
In the Directory field, click the folder icon () and specify a directory for the repository files.

Step 2. Run a Docker container

For this tutorial, we are going to run a PostgreSQL container for Docker (from the datagrip-documentation repository). In the Docker directory of the repository, you can find .env and docker-compose.yml files. .env includes credentials for the PostgreSQL service. docker-compose.yml defines how the service is created and configured.

The service name is the first line of the service definition (before the JDBC URL). In our example, the service name is postgresql_12, the JDBC URL is jdbc:postgresql://localhost:54333/guest?user=guest&password=guest.

postgresql_12:
      # jdbc:postgresql://localhost:54333/guest?user=guest&password=guest
      container_name: postgresql_12
      ports:
        - "54333:5432"
      image: postgres:12-alpine
      env_file: .env
      healthcheck:
        test: "exit 0"

You can run the container from a command line by running:

docker-compose up -d postgresql_12

Note that you must navigate to the directory of the docker-compose.yml file first.

Alternatively, you can enable and use the Docker plugin in GoLand.

Enable Docker support

Install and run Docker.
For more information, see the Docker documentation.
Configure the Docker daemon connection settings:
- In the Settings/Preferences dialog Ctrl+Alt+S, select Build, Execution, Deployment | Docker.
- Click to add a Docker configuration and specify how to connect to the Docker daemon.
  The connection settings depend on your Docker version and operating system.
  The Connection successful message should appear at the bottom of the dialog.
  
  The Path mappings table is used to map local folders to corresponding directories in the Docker virtual machine's file system. Only specified folders will be available for volume binding.
  This table is not available on Linux, because when running Docker on Linux, any folder is available for volume binding.
Connect to the Docker daemon.
The configured Docker connection should appear in the Services tool window (View | Tool Windows | Services or Alt+8 ). Select the Docker node , and click , or select Connect from the context menu.

To edit the Docker connection settings, select the Docker node and click on the toolbar, or select Edit Configuration from the context menu.

Create the Docker-compose deployment configuration

In the Services tool window (View | Tool Windows | Services ), right-click the Docker node and select Deploy.
In the popup window, select Create Docker-compose Deployment.
In the Create Deployment Configuration dialog, click the Browse icon of the Compose file(s) field.
In the Docker Compose Configuration Files dialog, click the Add button and navigate to the compose file. The Compose YAML file defines services, networks, and volumes. In our case, it is docker-compose.yml
In the Docker Compose Configuration Files dialog, click OK.
In the Service(s) field, type postgresql_12.
Click Run.
As a result, you can see the postgresql_12 running container in the Services tool window.

Step 3. Connect to a data source

Depending on a database vendor (MySQL, PostgreSQL, Oracle), you need to create a corresponding data source connection. In this tutorial, we will create a PostgreSQL connection. If you want to connect to other database management systems (DBMS), refer to Database connection.

In the Database tool window (View | Tool Windows | Database ), click the Data Source Properties icon .
In the Data Sources and Drivers dialog, click the Add icon () and select PostgreSQL.
At the bottom of the data source settings area, click the Download missing driver files link. As you click this link, GoLand downloads drivers that are required to interact with a database. To decrease the size of the installation package and keep driver versions up-to-date, drivers are not bundled with the IDE.
You can specify your own drivers for the data source if you do not want to download the provided drivers. For more information about creating a database connection with your driver, see Add a user driver to an existing connection.
In the URL field, copy and paste the JDBC URL: jdbc:postgresql://localhost:54333/guest?user=guest&password=guest. JDBC URL for other DBMS, see in docker-compose.yml. You can open docker-compose.yml in a text editor.
(Optional) In the Name field, delete the current name and type a new name for the connection (for example, PostgreSQL).
To ensure that the connection to the data source is successful, click the Test Connection link.

Step 4. Attach a directory to the project

To run dump files from the project in GoLand, attach a directory with dump files.

Click File | Open.
Navigate to the folder that you want to attach. In this tutorial, this folder is dumps that you cloned on Step 1 (Sakila dump files).
Click Open.
In the Open Project dialog, click Attach.

Step 5. Run the dump files

Create the database structure

In the Project (View | Tool Windows | Project) tool window, navigate to the postgres-sakila-db tree node.
Expand postgres-sakila-db tree node.
Right-click the postgres-sakila-schema.sql and select Run postgres-sakila-schema .sql. Alternatively, click the postgres-sakila-schema.sql file and press Ctrl+Shift+F10.
In the Edit Configuration dialog, click the Add button and select PostgreSQL.
Press Run.

Load sample data to the database

In the Project (View | Tool Windows | Project) tool window, navigate to the postgres-sakila-db tree node.
Expand postgres-sakila-db tree node.
Right-click the postgres-sakila-insert-data.sql and select Run postgres-sakila-insert-data.sql. Alternatively, click the postgres-sakila-insert-data.sql file and press Ctrl+Shift+F10.
In the Edit Configuration dialog, click the Add button and select PostgreSQL.
Press Run.

Step 6. Fetch dependencies from the Go code

To issue a query to PostgreSQL, we are going to use the sqlx library that provides a set of extensions for the Go standard database/sql library. For more information about the library, read about sqlx on GitHub.

main.go at GitHub: click the link to get the code from the GiHub repository.

Create a Go project in GoLand.
Right-click the root folder in the project and navigate to New | Go File.
In the New Go File dialog, type main in the Name field and click OK.
Copy the attached code snippet and paste it to the main.go file.
Place the caret at the "github.com/jmoiron/sqlx" import line, press Alt+Enter and click go get -t github.com/jmoiron/sqlx.

Step 7. Run the configuration

To run the configuration, click the Run icon () in the gutter near the main function and select Run 'go build main.go'.

Last modified: 08 March 2021