29 lines
1.2 KiB
Markdown
29 lines
1.2 KiB
Markdown
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## Database Persistence ##
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The persistence package includes classes to store different class objects in a Postgres database.
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### models ###
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This defines models for all class objects that we want to persist. It is used for Object Relation Mapping (ORM)
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of the class objects to database table columns
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### repositories ###
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This defines repository classes that contain CRUD methods for database operations.
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### config_db ##
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This Python file is a configuration class that contains variables that map to configuration parameters in a .env file.
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It also contains a method ``def conn_string()`` which returns the connection string to a Postgres database.
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### Base ##
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This class has a constructor that establishes a database connection and returns a reference for database-related CRUD operations.
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### db_migration ###
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This Python file is in the root of Hub and should be run to create all the required Postgres database tables
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### Database Configuration Parameter ###
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A .env file (or environment variables) with configuration parameters described below are needed to establish a database connection:
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```
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DB_USER=postgres-database-user
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DB_PASSWORD=postgres-database-password
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DB_HOST=database-host
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DB_PORT=database-port
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```
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