sqlutils/mysql/buildWhereFromQuery.js

Lightweight SQL helper methods that simplify stuff (MySQL and PostgreSQL)

const escape = require('./escape');

/**
 * @param { object } query object
 * @returns { string }
 */
module.exports = function(query){
    let str = '';

    let i = 0;
    for(let key in query){
        if(Array.isArray(query[key])){
            if(i == 0)
                str += ' WHERE (';
            else
                str += ' AND ';
            str += '(' + query[key].map(x => `${key}${x == null ? ' IS ' : '='}${escape(x)}`).join(' OR ') + ')';
        }
        else {
            if(i == 0)
                str += ' WHERE (';
            else
                str += ' AND ';
            str += `${key}=${escape(query[key])}`;
        }
        i += 1;
    }
    if(i > 0)
        str += ')';

    return str;
}