61 lines
3.8 KiB
Markdown
61 lines
3.8 KiB
Markdown
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## Installing PostgreSQL Database Server on Linux (Ubuntu) ##
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Execute the *install_postgresql_linux.sh* script to install PostgreSQL database
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*NB: PostgreSQL DB Server runs on a default port of 5432.*
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## Installing PostgreSQL Database Server on Windows ##
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1. Download a Windows installer from [this link](https://www.enterprisedb.com/downloads/postgres-postgresql-downloads).
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2. Double click on the installer file and follow the prompts of the installation wizard
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3. On the component selection page of the installation wizard make sure to select *PostgreSQL Server and Commandline tools*
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4. You can optionally select pgAdmin 4 to install a graphical UI to access your database
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5. On the password page when prompted, enter the default password (postgres) and confirm it
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6. You can change the default password of 5432 on the port page. You should ensure that whatever port number you
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provide is not used by another service.
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7. Follow the installation wizard prompt to complete your installation. You can verify your installation by
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searching for the *psql* tool from your start menu
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## Installing PostgreSQL Database Server on Mac OS X ##
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1. Download the Mac OS X installer from [this link](https://www.enterprisedb.com/downloads/postgres-postgresql-downloads).
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2. Launch the installation wizard by double-clicking it and follow the rest of steps as described above on
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Installing PostgreSQL Database Server on Windows.
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NB: Hub has been tested with version 15 of PostgreSQL
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## Create Database and Database User ##
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1. Connect to the PostgreSQL database server via psql by executing `sudo -u postgres psql`. You will be
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be prompted for a password, the default password of *postgres* user is *postgres*. The above command may not work on
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a Windows system using the default command line tool. You can access the psql tool from Windows start menu and follow
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the rest of the instructions from step 2 below
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2. Execute `create user <username> with encrypted password '<password>';` in the psql console to create a user.
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3. Execute `create database <database-name>;` in the psql console to create a database.
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4. Execute `grant all privileges on database <database-name> to <username>;` to grant the all privileges on the database
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to the user created in step 2 above.
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5. The created database by default, has on schema named public which you can use. However, if you wish to create
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another schema, you can do so by following [this link](https://www.postgresqltutorial.com/postgresql-administration/postgresql-create-schema/).
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**NB: You can grant selected privileges to the user on the database using commands [on this page](https://tableplus.com/blog/2018/04/postgresql-how-to-grant-access-to-users.html).*
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The user should however have read and write permission to all tables in the database. You can as well create a database and user using the PgAdmin UI tool*
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## Setting Up Database Connection Parameters
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1. Create a .env file that contains the configuration parameters as explained in the *Database Configuration Parameters*
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section in persistence/README.md file.
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2. The .env file should contain the following credentials: database user, database password, database host an,d database port
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3. Provide the *absolute path* to the .env file to the persistence importers and exporters whenever using them in your code
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as shown below:
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```python
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from exports.db_factory import DBFactory
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from pathlib import Path
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dotenv_path = (Path(__file__).parent / '.env').resolve()
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factory = DBFactory(db_name='hub_db', app_env='PROD', dotenv_path=dotenv_path, city=None)
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```
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## Create Database Tables ##
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Use the *DBSetUp* class in the persistence package to create the required database tables as described below
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```python
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from persistence import DBSetup
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from pathlib import Path
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dotenv_path = (Path(__file__).parent / '.env').resolve()
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DBSetup(db_name='hub_db', app_env='PROD', dotenv_path=dotenv_path)
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```
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