解析异步函数时，Promise始终未定义

Question

I'm doing a database query in an async function, then calling it from another file with a promise . But the result of the promise is always undefined .

My db function:

async function findSomething(id) {
   var query = "my_query";
   connection.query(query);
};

This is how I'm calling it from another file:

DbUtil.findSomething(1).then(function(result, error) {
   if(!error) {
    console.log("the result " + result);
  }
});

The result is always undefined .

Note that the calling function, DbUtil.findSomething is called from another file. I do not want to chain it inside the findSomething() function.

What am I missing?

Answer 1

You are missing a return statement.

Any function without one returns undefined .

Since findSomething is as async function, the return value is used to resolve the promise it returns.

async function findSomething(id) {
  var query = "my_query";
  return connection.query(query);
};