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Folks, 我正在編寫一個API函數,需要對後端DynamoDB表進行多次調用。返回的JSON結果需要合併,然後作爲單個響應返回給調用者。我怎麼會寫這個,因爲我似乎沒有完全寫這個異步...node.js回調函數dynamodb
到目前爲止,我已經能夠編寫函數來進行一次調用,然後返回它。我將如何編程第二個db.query?
var restify = require('restify');
var fs = require('fs');
var AWS = require('aws-sdk');
AWS.config.update({region: 'us-east-1'});
var db = new AWS.DynamoDB();
module.exports = {
license: function (req, res, next) {
var params = {
TableName : 'tableA',
KeyConditions :
{
"myHashKey":
{
"AttributeValueList" : [
{
"S" : "1"
}
],
"ComparisonOperator" : "EQ"
},
"myRangeKey" :
{
"AttributeValueList" : [
{
"S" : req.params.rangekeyA
}
],
"ComparisonOperator" : "EQ"
}
}
}
data = db.query(params, function(err, data) {
if (err) {
console.log(err);
}
else {
res.statusCode = 200;
res.setHeader('Content-Type', 'text/plain; charset=UTF-8');
res.send(JSON.stringify(data, undefined, 2));
res.end();
}
});
return next();
},
};
是async.js https://github.com/caolan/async東西我應該看看?