如何在Java中将日期格式转换为其他日期格式？

Question

i want to convert a date format to another format:

try {
    System.out.println("try block tai asche naki ?" + stockData.getTRANSDATE());
    SimpleDateFormat inFmt = new SimpleDateFormat("yyyyMMddHHmmss");
    SimpleDateFormat outFmt = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

    date = inFmt.parse(stockData.getTRANSDATE().toString());
    System.out.println("conversion" +inFmt.parse(stockData.getTRANSDATE().toString()) );

    System.out.println("old date format ?" + date);
    //date1 = outFmt.format(date);
    System.out.println("new date format "+ outFmt.format(date));
    return template
    .queryForInt(
        "SELECT COUNT(TRANSDATE) FROM stockdata
         WHERE TRANSDATE= ? AND symbolname = ?",
    rowMapper,outFmt.format(date), SymbolName);
} 

as i want to use it in a sql query its not working please help me out how i will convert the date so i can use it in the db as outFmt.format(date) cant be resolved in DB query

Thanks

Answer 1

Dateformat is for parsing string to java Date type or output date object to text with certain pattern.

In your case, you need a Date object for your query, not a String.

is this code working for you?

 return template
                    .queryForInt(
                            "SELECT COUNT(TRANSDATE) FROM stockdata WHERE TRANSDATE= ? AND symbolname = ?",
                            rowMapper,date, SymbolName);

Answer 2

I'm guessing that you're using Spring's JdbcTemplate. Why don't you just bind a java.sql.Date or java.sql.Timestamp instead of formatting it?

UPDATE :

I don't know what stockData.getTRANSDATE() is, but in order to convert it to Timestamp , do this:

Timestamp date = new TimeStamp(
  inFmt.parse(stockData.getTRANSDATE().toString()).getTime());

Then, pass it to Spring as a bind value, without formatting:

return template
    .queryForInt(
        "SELECT COUNT(TRANSDATE) FROM stockdata
         WHERE TRANSDATE= ? AND symbolname = ?",
    rowMapper, date, SymbolName);