@randombenj/db/src/database/database.service.ts

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import { Injectable, Inject } from '@nestjs/common';
import { Connection, Repository } from 'typeorm';

@Injectable()
export class DatabaseService {
    /**
     * Initializes the database service
     * @param connection The connection, which gets injected
     */
    constructor(@Inject('Connection') public connection: Connection) { }

    /**
     * Returns the repository of the given entity
     * @param entity The database entity to get the repository from
     */
    async getRepository(entity: any) {
        return this.connection.getRepository(entity);
    }

    /**
     * Closes the current connection, if it is
     * connected
     */
    async closeConnection() {
        const connection = this.connection;
        if (connection.isConnected) {
            await this.connection.close();
        }
    }
}