mgm/db/DataBase.js

My generic modules

const ThreadLocal = require('../tool/ThreadLocal');

class DataBase {

    constructor() {

    }

    createSchema(pathToSql) {
        if (!fs.existsSync(pathToSql)) {
            fs.writeFileSync(pathToSql, ';');
        }

        let statements = fs.readFileSync(pathToSql).toString().replace(/\r\n/g, '').replace(/\s{4}/g, '').split(';').filter(value => { return value !== ''; });

        statements.forEach(statemt => {
            this.update([statemt]);
        });
    }

    runSql(sql) {
        return ThreadLocal.get('db').query(sql.join(''));
    }

    query(sql) {
        return this.runSql(sql);
    }

    unique(sql) {
        let result = this.query(sql);
        if (result.length > 1) {
            throw new Error('the query must return only one value');
        }
        return result[0];
    }

    update(sql) {
        this.runSql(sql);
    }
}

module.exports = new DataBase();