Do async in a blocking program language way?

Question

1. Sync way

For example, ruby:

con = Mysql.new(\'localhost\') 
rs1 = con.query(\'select * from test01\')  # A
rs2 = con.query(\'select * from t         


        

Answer 1

My question is, does it have to be in this way? Is it possible by writing sync code but get a async effect?

Yes. You can use async/await on Node 7+ or generator based coroutines on older versions of Node.

It will look something like:

var x = await f1();
var y = await f2(x);
// ...

or even:

var y = await f2(await f1());
// ...

but it will still be asynchronous and non-blocking. You can use that syntax with any function that returns a promise - like a lot of the database drivers and ORMs/ODMs in Node do.

See those answers for more examples:

• How do I send multiple queries from one endpoint with Express?
• I can't get the value of "result" in Node.js