Scan migration directory only if migrationRun = true.

[virus-warnning]

Feature Description

The Problem

Function createConnection() takes 30 seconds for my ormconfig.
The major reasons of the time consumption are:

• entities
• subscribers
• migrations

When I set migrationRun = false, migration directory was still loaded.

So that I have to switch it myself, like following ...

// entities | subscribers | migrations | elapsed
// ----------------------------------------------
//     X    |      X      |      X     |   0.043
//     O    |      X      |      X     |  19.967
//     X    |      O      |      X     |   0.436
//     X    |      X      |      O     |  10.860
//     O    |      O      |      O     |  31.047

const ormConfig = {
    type: 'mariadb',
    host: process.env.DB_HOST || '127.0.0.1',
    port: process.env.DB_PORT || 3306,
    username: process.env.DB_USER || '****',
    password: process.env.DB_PASS || '****',
    database: process.env.DB_NAME || '****',
    synchronize: (process.env.DB_SYNC == 'true'),
    logging: (process.env.DB_DEBUG == 'true'),
    bigNumberStrings: false,
    entities: [
        `${BASE_DIR}/entities/**/*.{ts,js}`
    ],
    subscribers: [
        `${BASE_DIR}/database/subscriptor/**/*.{ts,js}`
    ],
    cli: {
        'migrationsDir': `${BASE_DIR}/migration`
    }
};

if (process.env.DB_MIGRATION_RUN === 'true') {
    ormConfig.migrationsRun = true;
    ormConfig.migrations = [`${BASE_DIR}/migration/*.{ts,js}`];
}

export default ormConfig;

The Solution

Scan migration directory only if migrationRun = true.

Considered Alternatives

Additional Context

Relevant Database Driver(s)

• aurora-data-api
• aurora-data-api-pg
• better-sqlite3
• cockroachdb
• cordova
• expo
• mongodb
• mysql
• nativescript
• oracle
• postgres
• react-native
• sap
• sqlite
• sqlite-abstract
• sqljs
• sqlserver

Are you willing to resolve this issue by submitting a Pull Request?

• Yes, I have the time, and I know how to start.
• Yes, I have the time, but I don't know how to start. I would need guidance.
• No, I don't have the time, although I believe I could do it if I had the time...
• No, I don't have the time and I wouldn't even know how to start.