我正在使用一個tableau web連接器來下載股票價格。源代碼如下:如何讓雅虎財務YQL查詢超過1年的股票數據?
<html>
<meta http-equiv="Cache-Control" content="no-store" />
<head>
<title>Stock Quote Connector-Tutorial</title>
<script src="https://connectors.tableau.com/libs/tableauwdc-1.1.1.js" type="text/javascript"></script>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js" type="text/javascript"></script>
<script type="text/javascript">
(function() {
function buildUri(tickerSymbol, startDate, endDate) {
var startDateStr = getFormattedDate(startDate);
var endDateStr = getFormattedDate(endDate);
var queryStatement = 'select * from yahoo.finance.historicaldata where symbol = "' +
tickerSymbol +
'" and startDate = "' + startDateStr +
'" and endDate = "' + endDateStr + '"';
var uri = 'http://query.yahooapis.com/v1/public/yql?q=' +
encodeURIComponent(queryStatement) +
"&env=http%3A%2F%2Fdatatables.org%2Falltables.env&format=json";
return uri;
}
function getFormattedDate(date) {
// Return a date in the format YYYY-MM-DD
return date.getUTCFullYear() +
'-' +
makeTwoDigits(date.getUTCMonth() + 1) +
'-' +
makeTwoDigits(date.getUTCDate());
}
function makeTwoDigits(num) {
// Pad a digit to be two digits with leading zero
return num <= 9 ? "0" + num.toString() : num.toString();
}
var myConnector = tableau.makeConnector();
myConnector.getColumnHeaders = function() {
var fieldNames = ['Ticker', 'Day', 'Close'];
var fieldTypes = ['string', 'date', 'float'];
tableau.headersCallback(fieldNames, fieldTypes);
}
myConnector.getTableData = function(lastRecordToken) {
var dataToReturn = [];
var hasMoreData = false;
// Get parameter values and build YQL query
var ticker = tableau.connectionData;
var endDate = new Date();
var startDate = new Date();
startDate.setYear(endDate.getFullYear() - 1);
//startDate.setYear(startDate.getFullYear() - 1);
//startDate.setYear(startDate.getFullYear() - 1);
//startDate.setYear(startDate.getFullYear() - 1);
var connectionUri = buildUri(ticker, startDate, endDate);
var xhr = $.ajax({
url: connectionUri,
dataType: 'json',
success: function (data) {
if (data.query.results) {
var quotes = data.query.results.quote;
var ii;
for (ii = 0; ii < quotes.length; ++ii) {
var entry = {'Ticker': quotes[ii].Symbol,
'Day': quotes[ii].Date,
'Close': quotes[ii].Close};
dataToReturn.push(entry);
}
tableau.dataCallback(dataToReturn, lastRecordToken, false);
}
else {
tableau.abortWithError("No results found for ticker symbol: " + ticker);
}
},
error: function (xhr, ajaxOptions, thrownError) {
tableau.log("Connection error: " + xhr.responseText + "\n" + thrownError);
tableau.abortWithError("Error while trying to connect to the Yahoo stock data source.");
}
});
}
tableau.registerConnector(myConnector);
})();
$(document).ready(function() {
$("#submitButton").click(function() {
var tickerSymbol = $('#ticker').val().trim();
if (tickerSymbol) {
tableau.connectionName = "Stock Data for " + tickerSymbol;
tableau.connectionData = tickerSymbol;
tableau.submit();
}
});
});
</script>
</head>
<body>
<p>Enter a stock ticker symbol: <input type="text" id="ticker" /></p>
<p><button type="button" id="submitButton">Get the Data</button></p>
</body>
</html>
的代碼是可行的,當我們只是想下載一點一年的數據,但如果我們改變的時間超過1年(enddate.year - startdate.year > 1
)更長的時間,這是行不通的。 調試代碼後,我發現這個問題來自YQL查詢:
http://query.yahooapis.com/v1/public/yql?q=select * from yahoo.finance.historicaldata where symbol = "AAPL" and startDate = "2014-08-24" and endDate = "2016-11-23"&env=http%3A%2F%2Fdatatables.org%2Falltables.env&format=json
時startDate = "2014-08-24" and endDate = "2016-11-23"
超過15一個月時,YQL將返回null。我正在嘗試解決這個問題。如果是python或java,問題不難,首先檢查持續時間是否超過1年,如果是,獲得1年的結果,並在n-1年的休息時間內執行相同的操作。但是這個代碼使得我堅持下去。我必須使代碼適用於畫面,這使我無法繼續進行,因爲缺乏關於js和畫面的知識。
任何人都可以就這個問題提出建議嗎?我的目標是讓代碼在AAPL這樣的股票代碼中可用10年以上。
在此先感謝。