java中毫秒和SimpleDateFormat与JXDatepicker冲突

在我当前的项目中，我以毫秒为单位保存日期，如下所示：

  long f = jXDatePicker1.getDateInMillis();
  //Data is saved in database.

  long firstDate =  jXDatePicker1.getDateInMillis();
  long secondDate =  jXDatePicker2.getDateInMillis();

  Calendar cal = Calendar.getInstance();
  Calendar cal2 = Calendar.getInstance();

DefaultTableModel model = (DefaultTableModel) jTable1.getModel();
int rows = model.getRowCount();
if (rows>0){
for(int i=0 ; i<rows; i++)
{model.removeRow(0);}}

String query = "SELECT CODE, AD_DATE, EX_DATE, PLAN_NAME, AMOUNT, DISCOUNT, TOTAL"
        + " FROM ADMISSION_MASTER WHERE AD_DATE>="+firstDate+" AND AD_DATE<="+secondDate+" ";

try{
    conn = new data.connection().db();
    stmtt = conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY);
    rs = stmtt.executeQuery(query);
    while(rs.next()){
        long F = rs.getLong("AD_DATE"); cal.setTimeInMillis(F);
        long T = rs.getLong("EX_DATE"); cal2.setTimeInMillis(T);
        String frm = sdf.format(cal.getTime());
        String too = sdf.format(cal2.getTime());
        model.addRow (new Object[]{rs.getString(1), frm, too, rs.getString(4), rs.getString(5), rs.getString(6), rs.getString(7)});

    }}
 catch(SQLException ex){}
 finally{try{stmtt.close(); rs.close(); conn.close();}
 catch(SQLException ex){}

接下来，我将编写一个如下的查询：

  long f = jXDatePicker1.getDateInMillis();
  //Data is saved in database.

  long firstDate =  jXDatePicker1.getDateInMillis();
  long secondDate =  jXDatePicker2.getDateInMillis();

  Calendar cal = Calendar.getInstance();
  Calendar cal2 = Calendar.getInstance();

DefaultTableModel model = (DefaultTableModel) jTable1.getModel();
int rows = model.getRowCount();
if (rows>0){
for(int i=0 ; i<rows; i++)
{model.removeRow(0);}}

String query = "SELECT CODE, AD_DATE, EX_DATE, PLAN_NAME, AMOUNT, DISCOUNT, TOTAL"
        + " FROM ADMISSION_MASTER WHERE AD_DATE>="+firstDate+" AND AD_DATE<="+secondDate+" ";

try{
    conn = new data.connection().db();
    stmtt = conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY);
    rs = stmtt.executeQuery(query);
    while(rs.next()){
        long F = rs.getLong("AD_DATE"); cal.setTimeInMillis(F);
        long T = rs.getLong("EX_DATE"); cal2.setTimeInMillis(T);
        String frm = sdf.format(cal.getTime());
        String too = sdf.format(cal2.getTime());
        model.addRow (new Object[]{rs.getString(1), frm, too, rs.getString(4), rs.getString(5), rs.getString(6), rs.getString(7)});

    }}
 catch(SQLException ex){}
 finally{try{stmtt.close(); rs.close(); conn.close();}
 catch(SQLException ex){}

long firstDate=jXDatePicker1.getDateInMillis（）；
long secondDate=jXDatePicker2.getDateInMillis（）；
Calendar cal=Calendar.getInstance（）；
Calendar cal2=Calendar.getInstance（）；
DefaultTableModel=（DefaultTableModel）jTable1.getModel（）；
int rows=model.getRowCount（）；
如果（行数>0）{
对于（int i=0；iWhat RDBMS（SQL风格）？AD_DATE的类型是什么？我们可以获得一些示例数据和预期结果吗？——这适用于所有RDBMS。您应该执行一个准备好的语句（您的查询目前仅因键入而不受SQL注入的影响）-这是事情的原理。“AD_DATE”是“BIGINT”。我使用的是Derby数据库。你需要给我们提供样本数据-很难从中看出哪里出了问题。为什么你不使用内置的日期/时间戳类型？从全球来看，一个太阳日大约有48小时长-你应该使用
日期
作为“日历日”吗，或“特定时间点”的
Timestamp
。获取以毫秒为单位的时间戳应给出一个绝对值；如果源和查询都使用一个时区，则无所谓。如果跨时区使用db，则db应以UTC为单位-您需要在该点进行调整。