Database

Introduction

Through SQLAlchemy, Grace supports SQLite, MySQL/MariaDB, PostgreSQL, Oracle and Microsoft SQL Server (Supported dialects). The configurations are divided in three sections. production, development and test. They can use the same or completely different databases, dialects, hosts, etc.

Default configuration

By default, Grace will generate the database configuration with SQLite configured for development and testing. Production, on the other hand, expects to receive a database URL defined by an environment variable named DATABASE_URL.

Configuration

To set up the connection to your database, update or create config/database.cfg. You can have up to three database configurations, one for each environment (production, test and development). Each section is delimited by [database.<environment>] For example, the production section would be [database.production].

Value	Description	Used by (* means used by all)
adapter	SQL dialect+driver (driver optional)	*
user	User name	MySQL, PostgreSQL, Oracle, Microsoft SQL Server
password	User password	MySQL, PostgreSQL, Oracle, Microsoft SQL Server
host	Database server’s hostname	MySQL, PostgreSQL, Oracle, Microsoft SQL Server
port	Database server’s port	MySQL, PostgreSQL, Oracle, Microsoft SQL Server
database	Database name	*
url	Complete database URL
(Bypass configurations)	*

Examples

Below you will find a few example using the most common databases dialects. All examples are under the development section but can be applied to other environment sections.

SQLite

[database.development]
adapter = sqlite
database = grace_development.db

MySQL/MariaDB

[database.development]
adapter = mysql
host = localhost
port = 3306
database = grace_development
user = grace
password = GraceHopper1234

PostgreSQL

[database.development]
adapter = postgresql
host = localhost
port = 5432
database = grace_development
user = grace
password = GraceHopper1234

Environment variables

Environment variables can be used to dynamically populate the configuration files. Every values surrounded by ${} will be inserted into the configuration on execution.

Example

Consider an environment variable named DATABASE_URL containing sqlite:///grace_development.db

[database.development]
url = ${DATABASE_URL}

Will be read as

[database.development]
url = sqlite:///grace_development.db