How do I render return values of a node-mssql statement with Jade?

Question

I've got a Node.js server with Express and Jade running. On an HTTP request the server will execute the following function:

function home(req, res) {

  res.render("site/index", {recordset: recordset}); //render the Jade template
}

Now I would like to pass in an array to the above recordset variable that I can loop through in Jade to populate a drop-down on my html page. I've retrieved the desired array like so:

function runSQLSelect() {
      sql.connect(config.db, function(err) {
      var request = new sql.Request();
      request.query("select MyColumn FROM MyTable", function(err, recordset) {
        console.log(recordset);
        });
      });
}

What is a proper way to asynchronously run the SQL query and pass the subsequent result into my Jade template?

Answer 1

You will have the res.render in the callback from query.

function runSQLSelect(callback) {
      sql.connect(config.db, function(err) {
      var request = new sql.Request();
      request.query("select MyColumn FROM MyTable", function(err, recordset) {
        console.log(recordset);
        callback(recordset);
        });
      });
}

function home(req, res) {
  runQSQLSelect( function(result) {
      res.render("site/index", {recordset: result}); //render the Jade template
  });
}

Note, you may want to have your callback invoked in an async fashion, using setImmediate, you also might consider having your runSQLSelect callback make use of the standard node practice of accepting two parameters callback(err,data).