In node.js mysql query, check if no matching found

Question

How can I check if no matching found in mysql (node.js)?

mysql.query(\"select * from table1 where name = \'abcd\'\", function(error, result, field) {
    if(         


        

Answer 1

You're receiving an empty array ([]) as result of your query, because as you said, your database does not contain any row with name = 'abcd'.

When you do:

if (result) {
  if (result)
    console.log("Test:" + result);

, you'll enter the if, because Javascript evaluates true for []. Take a look at this article here, that explains how Javascript evaluates true and false values.

A better way to check if your result array is empty is to do:

if (result.length > 0) {
  if (result)
    console.log("Test:" + result);