[sniffysko]

У меня типа так:

const sql = require('mssql');

let _instance = null;

class AppSql{
	constructor(){
		const sqlConfig = {
			user: config.sql.user,
			password: config.sql.password,
			database: config.sql.database,
			server: config.sql.server,
			domain: config.sql.domain,
			parseJSON: config.sql.parseJSON,
			options: {
				trustedConnection: config.sql.trustedConnection,
			}
		};

		this._pool = null;

		(async () => {
			try {
				this._pool = await new sql.ConnectionPool(sqlConfig).connect();
				this._pool.on('error', (err) => {
					LOG.logError( MSG.fgetMsg('eSqlCommon', err.stack) );
				})
				LOG.logInfo( MSG.getMsg('iSqlConnected') );
			} catch (err) {
				LOG.logError( 'AppSql.constructor. \n' + MSG.fgetMsg('eSqlConnect', err.stack) );
			}
		})();
	}

	get pool(){
		return this._pool;
	}


	async querySimple(q, params){
		await this._pool; 
		try {
			const request = this._pool.request();
			if(params){
				for (const key in params) {
					const value = params[key];
					request.input(key, value);
				}
			}
			const result = await request.query(q);
			return Promise.resolve(result);
		} catch (err) {
			console.log(q, err);
			return Promise.reject(err);
		}
	}

}


sql.on('error', (err) => {
	LOG.logError( 'SQL Emitter.\n' + MSG.fgetMsg('eSqlCommon', err.stack) );
});

// Экспорт инстанса
module.exports = {
	getInstance: () => {
		return _instance || (_instance = new AppSql());
	}
};