javascript: Armar query SQL a partir de un objeto json

var obj = {
    s_campo1 : "'hola'", //string
    f_campo2 : 'now()', //function
    b_campo3 : true, //booleano
    i_campo4 : 5 //int
}

var query = "INSERT INTO TABLA (" + _.keys(obj).join(",") + ") " ;
    query += "VALUES ";
    query += "("+ _.values(obj).join(",") + ")" ;

console.log(query)

test rck:

http://jsfiddle.net/yAFgu/7/