If you need asynchronous tasks to be synchronized, you should proceed with
the next "stage" in the previous stage's `then` block:
function getConnection (server, databaseName) {
// ...
}
function executeServerQueries (connection, queries) {
var queryPromises = queries.map(function (query) {
return connection.execute(query);
});
// the 'catch' below insures this function always returns a resolved
promise
return Promise.all(queryPromises)
.catch(function (err) {
console.log(err);
return 'No results!';
});
}
function executeQueries (configArr) {
if (!configArr.length) return Promise.resolve();
var config = configArr.unshift();
return getConnection(config.sqlServer, config.databaseName)
.then(function (connection) {
return Promise.all([
executeServerQueries(connection, config.queries),
connection
]);
})
.then(function (outcome) {
var connection = outcome.pop(),
results = outcome.pop();
connection.close();
// do something with results?
return executeQueries(configArr);
});
}
Now, `executeQueries` just takes an array of configurations and returns a
`Promise` after all have completed. I forgot if Node.js has native
`Promise.all` support, but you can use something like bluebird if not. It
can also be cleaned up a bit by using some other bluebird methods and es6
syntax (but I forgo'd these since I didn't see you use them).
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