从javascript异步查询neo4j

Question

Up to now, I managed to have my function that run the queries being able to return a result immediately. so the structure of my functions where

var session = driver.session();
return session.run([QUERY]).then(result=> return result.record.map ....)

I now have a bigger query and maybe for that reason, I end up having the query function return a Premise I switched then to an async function with the following structure

 var session = driver.session();
await session.run([QUERY]).then(result=> results= result.record.map ....)
return results

But then I get regeneratorRuntime is not defined at runtime in the console of the browser.

As environment config, I have the one of the sample movies-javascript-bolt-master

Thank You

Answer 1

You don't necessarily need async / await in order to make your code work. This is just syntaxic sugar but the mechanism under the hood is exactly the same, and it does not allow to do more things (an async function is just a function returning a Promise ). It just allows to make the code more compact and readable.

If you still want to use this syntax, you'll have to update Webpack and Babel to their latest versions, and update their configurations (use babel-presets-2017 which allows to transform async/await to generator functions in order to enable older runtimes to run your code).

The error code you have is related to this particular feature of Babel (you could also disable it completely).