/**
* Prints out the records for each symbol.
*
* <p>Can also verify the state of the database with csh> sqlite3 stocks.bd ".dump"
*
* @param symbols - list of symbols to dump data for
*/
static Map<String, List<QuoteRecord>> dumpSymbols(List<String> symbols) throws Exception {
Connection conn = initialize();
Map<String, List<QuoteRecord>> symbolToQuotesMap = new TreeMap<String, List<QuoteRecord>>();
for (int i = 0; i < symbols.size(); i++) {
String symbolname = symbols.get(i);
List<QuoteRecord> symbolToQuotes = new ArrayList<QuoteRecord>();
symbolToQuotesMap.put(symbolname, symbolToQuotes);
Statement stat = conn.createStatement();
try {
ResultSet rs = stat.executeQuery("SELECT * FROM " + symbolname + ";");
// 'Date','Open','High','Low','Close','Volume','Adj Close'
while (rs.next()) {
String date = rs.getString("Date");
String open = rs.getString("Open");
String high = rs.getString("High");
String low = rs.getString("Low");
String close = rs.getString("Close");
String volume = rs.getString("Volume");
String adjClose = rs.getString("Adj Close");
QuoteRecord qr = new QuoteRecord(date, open, high, low, close, volume, adjClose);
symbolToQuotes.add(qr);
// System.out.println(symbolname + ":open," + open + ":date," + date);
}
// TODO: why/when do we need to close this?
rs.close();
} catch (java.sql.SQLException e) {
// it can happen that symbols in Symbols.java go away over time
// so we need to ignore them
}
}
return symbolToQuotesMap;
}
/**
* Makes the entries in the database for a given symbol up to date.
*
* <p>This method as it currently is written is wasteful, since it does not attempt to see if the
* date range has any actual trading days - e.g., may try to pull in a range of a Sat and a
* Sunday.
*
* @param symbol - the symbol we are trying to bring up to date
*/
static void makeUpToDate(String symbol) throws Exception {
Connection conn = initialize();
Statement stat = conn.createStatement();
ResultSet rs = stat.executeQuery("select * from " + symbol + ";");
Date today = new Date();
Date latestDateFoundSoFar = null;
Date dateBeingProcessed = null;
while (rs.next()) {
String dateString = rs.getString("Date");
dateBeingProcessed = DateFromString(dateString);
System.out.println("processing:" + dateBeingProcessed);
if ((latestDateFoundSoFar == null)
|| (latestDateFoundSoFar.compareTo(dateBeingProcessed) < 0)) {
latestDateFoundSoFar = dateBeingProcessed;
System.out.println("\tupdated latestDateFoundSoFar:" + dateBeingProcessed);
}
}
if (latestDateFoundSoFar.compareTo(today) < 0) {
Calendar cal = new GregorianCalendar();
cal.setTime(latestDateFoundSoFar);
Date succLatestDateFoundSoFar = nextDate(latestDateFoundSoFar);
if (DaysAreEqual(succLatestDateFoundSoFar, today)) {
return;
}
updateSymbol(symbol, succLatestDateFoundSoFar, today);
}
}
/**
* Get the database as a map from symbols (e.g., "XOM") to a list of QuoteRecords. These records
* are sorted in ascending order by date.
*
* <p>The procedure does not guarantee duplicate quote records have been removed, but it does draw
* attention to their existence. (Such records can enter the database when performing
* tests/updates.)
*
* @see QuoteRecord, CheckSymbolToQuotesMap, SortSymbolToQuotesMap
*/
public static Map<String, List<QuoteRecord>> GetDatabaseAsMap() {
Map<String, List<QuoteRecord>> result = null;
List<String> symbols = new ArrayList<String>();
Connection conn = null;
try {
conn = initialize();
Statement stat = conn.createStatement();
ResultSet rs = stat.executeQuery("select * from listofsymbols;");
while (rs.next()) {
symbols.add(rs.getString("symbolname"));
}
rs.close();
result = dumpSymbols(symbols);
conn.close();
} catch (Exception e) {
e.printStackTrace();
}
SortSymbolToQuotesMap(result);
// CheckSymbolToQuotesMap( result );
return result;
}