Hello.
If you spend enough time in node.js you will eventually run into the need of a
control flow library. Creating your own control flow library is almost the hello
world of node.js.
My library is called async-array.
var async = require('async-array').async
var mysql = require('mysql').createConnection()
mysql.connect()
function mysqlmap (query, i, next) {
mysql.query(query, next)
}
function mysqldone (err, results) {
// OMG There was an error somewhere. Handle it houston.
if (err) throw err
// Change results from an AsyncArray back to a normal array.
results.array()
// Results are mapped to the same place as the query.
results[0]
results[1]
}
async(
[ 'SELECT * FROM my_ultimate_table'
, 'SELECT bacon FROM the_fridge'
]
)
.map(mysqlmap)
.exec(mysqldone)
It tries to keep the basic semantics of a normal array, adding some asyncronous
magic. https://github.com/tim-smart/async-array
Tim.
On Tue, Dec 25, 2012 at 09:14:27AM -0800, Joman Sierra wrote:
> I have this scenario:
>
> function one
> {
> Makes a query to a big mysql table
>
> }
>
> Function two
> {
> Makes another query to a big myslq table
> }
>
> res.render(showing results of the queries)
>
>
> The problem is that when render is executed the mysql queries are still in
> progress. What's the best way to be sure that the functions has finished
> before sending the render?
>
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