text: var connection = require("./connection.js")
  
  function printQuestionMarks(num) {
      var arr = [];
  
      for (var i = 0; i < num; i++) {
          arr.push("?");
      }
  
      return arr.toString();
  }
  
  function objToSql(ob) {
      var arr = [];
  
      for (var key in ob) {
          var value = ob[key];
  
          if (Object.hasOwnProperty.call(ob, key)) {
              if (typeof value === "string" && value.indexOf(" ") >= 0) {
                  value = "'" + value + "'";
              }
              arr.push(key + "=" + value);
          }
      }
  
      // translate array of strings to a single comma-separated string
      return arr.toString();
  }
  
  var orm = {
  
      all: function (tableInput, cb) {
          var queryString = "SELECT * FROM " + tableInput + ";";
          connection.query(queryString, function (err, result) {
              if (err) {
                  throw err;
              }
              cb(result);
          });
      },
      create: function (table, cols, vals, cb) {
          var queryString = "INSERT INTO " + table;
  
          queryString += " (";
          queryString += cols.toString();
          queryString += ") ";
          queryString += "VALUES (";
          queryString += printQuestionMarks(vals.length);
          queryString += ") ";
  
          console.log(queryString);
  
          connection.query(queryString, vals, function (err, result) {
              if (err) {
                  throw err;
              }
  
              cb(result);
          });
      },
      update: function (table, objColVals, condition, cb) {
          var queryString = "UPDATE " + table;
  
          queryString += " SET ";
          queryString += objToSql(objColVals);
          queryString += " WHERE ";
          queryString += condition;
  
          console.log(queryString);
          connection.query(queryString, function (err, result) {
              if (err) {
                  throw err;
              }
  
              cb(result);
          });
      }
  }
  
  module.exports = orm;