Nessie

A modular database migration tool for Deno inspired by Laravel and Phinx. Supports PostgreSQL, MySQL (& MariaDB) and SQLite.

If you would like to see your DB flavor supported, take a look at how to make a client plugin with examples in the clients folder or in the section How to make a client.

See documentation for the clients.

Nessie is available through:

CLI Usage

init: Generates a nessie.config.ts file and also the db folder where migration and seed files will be placed. Two options are available: --mode and --dialect.

--mode can be one of config or folders. If mode is not set, it will create a nessie.config.ts file and the db folder structure, otherwise it will create the selected one.

--dialect is used for the config file and can be one of pg, mysql or sqlite. If not set, it will create a general config file including all three dialects, otherwise it will include only the selected one.
```
deno run -A --unstable https://deno.land/x/nessie/cli.ts init

deno run -A --unstable https://deno.land/x/nessie/cli.ts init --mode folders

deno run -A --unstable https://deno.land/x/nessie/cli.ts init --mode config --dialect pg
```

make:migration [name] & make [name]: Create migration, name has to be snake- and lowercase, it can also include numbers.

deno run -A --unstable https://deno.land/x/nessie/cli.ts make:migration create_users

deno run -A --unstable https://deno.land/x/nessie/cli.ts make create_users

make:seed [name]: Create seed, name has to be snake- and lowercase, it can also include numbers.
```
deno run -A --unstable https://deno.land/x/nessie/cli.ts make:seed add_users
```

migrate [amount?]: Run migration - will migrate your migrations in your migration folder (sorted by timestamp) newer than the latest migration in your db. Amount defines how many migrations, defaults to all available if not set.

deno run -A --unstable https://deno.land/x/nessie/cli.ts migrate

deno run -A --unstable https://deno.land/x/nessie/cli.ts migrate 1

deno run -A --unstable https://deno.land/x/nessie/cli.ts migrate -c ./nessie.config.ts

rollback [amount?]: Rollback - will rollback your migrations. Amount defines how many migrations, defaults to 1 if not set.

deno run -A --unstable https://deno.land/x/nessie/cli.ts rollback

deno run -A --unstable https://deno.land/x/nessie/cli.ts rollback 2

deno run -A --unstable https://deno.land/x/nessie/cli.ts rollback all

seed [matcher?]: Seed - will seed your database. Optional matcher will match all files in your seed folder by string literal or RegExp.

deno run -A --unstable https://deno.land/x/nessie/cli.ts seed

deno run -A --unstable https://deno.land/x/nessie/cli.ts seed seed_file.js

deno run -A --unstable https://deno.land/x/nessie/cli.ts seed ".+.ts"

update_timestamps: Update timestamps - will update timestamps to the new format. Will only update timestamps where the value is less than 1672531200000 (2023-01-01) so that the timestamps won’t be updated multiple times.
```
deno run -A --unstable https://deno.land/x/nessie/cli.ts update_timestamps
```

Flags

-c, --config: Path to config file, will default to ./nessie.config.ts
-d, --debug: Enables verbose output

Deno flags and Permissions

While the examples simply show -A as the permission flag, you can also limit the permissions according to your needs. Bellow you will see what Nessie actually needs.

--unstable: Needed by std/fs/copy as it uses Deno.utimeSync and Deno.utime which are still unstable
--allow-read: Nessie needs read access to be able to read the migration and seed folders, it also checks for the presence of the config file.
--allow-write: When initiating Nessie or creating a new migration or seed file, write access is required.
--allow-net: If you use a remote config or migration files, this flag is needed to get access.

Config file

The config interface is exported from mod.ts as NessieConfig.

export interface NessieConfig {
  /** Can be any class which extends `AbstractClient`. */
  client: AbstractClient<any>;
  /**
   * The folders where migration files are located.
   * Can be a relative path or an absolute path.
   * Defaults to ['./db/migrations/'] if additionalMigrationFiles is not populated
   */
  migrationFolders?: string[];
  /**
  * The folders where seed files are located.
  * Can be a relative path or an absolute path.
  * Defaults to ['./db/seeds/'] if additionalSeedFiles is not populated
  */
  seedFolders?: string[];
  /**
  * Additional migration files which will be added to the
  * list to parse when running the migrate or rollback command.
  * Can be any format supported by `import()` e.g. url or path
  */
  additionalMigrationFiles?: string[];
  /**
  * Additional seed files which will be added to the list to
  * match against when running the seed command.
  * Can be any format supported by `import()` e.g. remote url or path
  */
  additionalSeedFiles?: string[];
  /** Enables verbose output for debugging */
  debug?: boolean;
}

Remote Migration or Seed files

With the introduction of additionalMigrationFiles and additionalSeedFiles, you can now include remote migration and seed files which you can fetch for example via ftp or using api’s like gihub or gitlab. Any input which can be given to the dynamic import() can be provided.

...
additionalMigrationFiles: ['https://example.com/some_migration_file.ts'],
...

See the example folder for more examples.

Contributing

All contributions are welcome, make sure to read the contribution guideline.

Uses

Cliffy
Deno Postgres
Deno MySQL - Currently it works with password for 5.*, but for >=8 you have to send a blank password, see issue 37
Deno SQLite

Examples

See example repo for a REST API which uses Oak and Nessie.

Nessie uses the AbstractMigration class which you can extend to access the client and its properties. This enables better flexibility in migrations and seeds and allows a more complex workflow.

nessie.config.ts with all default values

import {
  ClientPostgreSQL,
  NessieConfig,
} from "https://deno.land/x/nessie/mod.ts";

const clientPg = new ClientPostgreSQL({
  database: "nessie",
  hostname: "localhost",
  port: 5432,
  user: "root",
  password: "pwd",
});

const config: NessieConfig = {
  client: clientPg,
  migrationFolders: ["./db/migrations"],
  seedFolders: ["./db/seeds"],
  additionalMigrationFiles: [],
  additionalSeedFiles: [],
  debug: false,
};

export default config;

Minimal example of a migration file

import {
  AbstractMigration,
  ClientPostgreSQL,
  Info,
} from "https://deno.land/x/nessie/mod.ts";

export default class extends AbstractMigration<ClientPostgreSQL> {
  async up({ dialect }: Info): Promise<void> {
    await this.client.queryArray("CREATE TABLE table1 (id int)");
  }

  async down({ dialect }: Info): Promise<void> {
    await this.client.queryArray("DROP TABLE table1");
  }
}

Seed file

import {
  AbstractSeed,
  ClientPostgreSQL,
  Info,
} from "https://deno.land/x/nessie/mod.ts";

export default class extends AbstractSeed<ClientPostgreSQL> {
  async run({ dialect }: Info): Promise<void> {
    await this.client.queryArray("INSERT INTO table1 VALUES (1234)");
  }
}

See the example folder for more

How to make a client

A client needs to extend AbstractClient.

query: Takes a query string or array of query strings and sends them of to the database for execution. Should return whatever the database responds.

prepare: Will be run when the migration or rollback commands are executed. This should create the connection, set up the nessie_migrations table and prepare the database for incoming migrations.

migrate: Takes a number as an optional input, will default to all files if not set. Will run Math.min(amount, numberOfFiles) migration files. Only handles the up method.

rollback: Takes a number as an optional input, will default to 1 if not set. Will run Math.min(amount, numberOfFiles) migration files. Only handles the down method.

seed: Takes an optional matcher as input. Matcher can be regex or string. Will seed the database. Handles the run method in seed files.

close: Will be the last method run before the program is finished. This should close the database connection.