Question

我想在我的java应用程序中获取MySQL数据库数据，所以我使用这个代码：

//  Data retriveing from database HB_Cash
    try{
        connectDB();
        Statement st = con.createStatement();
        rs = st.executeQuery("select * from tbl_day_sheet_status_reports");

        while(rs.next()){
            PB_cash.setText(rs.getString("Handing_Balance_(CASH)"));
            String sv = rs.getString("Handing_Balance_(CASH)");
            sv =  PB_cash.getText();
            int billNumber = Integer.valueOf(sv);
            sv = Integer.toString(billNumber);
            PB_cash.setText(sv);
        }
        con.close();

    }catch(Exception ex){
        JOptionPane.showMessageDialog(this, ex.getMessage());
    }

当我调用此代码时，它工作正常，但有时会被卡住就像2160.81数据一样，如果之后有更多的数据，每次用消息框显示这个数据时都会插入：

所以我使用这个SQL create语句：

CREATE TABLE `tbl_day_sheet_status_reports` (
  `DaySheet_no` int(11) NOT NULL,
  `Date` varchar(45) DEFAULT NULL,
  `Previous_Balance_(CASH)` double DEFAULT NULL,
  `Previous_Balance_(CHQUE)` double DEFAULT NULL,
  `Daily_Collection_(CASH)` double DEFAULT NULL,
  `Daily_Collection_(CHQUE)` double DEFAULT NULL,
  `Daily_Collection_(CHQUE_NUMBER)` varchar(45) DEFAULT NULL,
  `Bank_Diposits_(CASH)` double DEFAULT NULL,
  `Bank_Diposits_(CHQUE)` double DEFAULT NULL,
  `Handing_Balance_(CASH)` double DEFAULT NULL,
  `Handing_Balance_(CHQUE)` double DEFAULT NULL,
  PRIMARY KEY (`DaySheet_no`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

请帮我解决这个问题。

Answer 1

   try{

    connectDB();

    Statement st = con.createStatement();

    rs = st.executeQuery("select * from tbl_day_sheet_status_reports");

    while(rs.next()){
         // You Can get this value as a float of Double 
         //Due to Class Cast Exception your  code is not working when value 
        //comes in float 
        PB_cash.setText(rs.getDouble("Handing_Balance_(CASH)")+"");
        String sv = rs.getDouble("Handing_Balance_(CASH)")+"";
        sv =  PB_cash.getText();
        double billNumber = Double.valueOf(sv);
        sv = Integer.toString(billNumber);
        PB_cash.setText(sv);
    }
    con.close();

}catch(Exception ex){
    JOptionPane.showMessageDialog(this, ex.getMessage());
}

Answer 2

我改变了（Er Kapil Mehta）这样的代码，它的作品非常完美谢谢你的帮助

try{

     connectDB();
     Statement st = con.createStatement();
     rs = st.executeQuery("select * from tbl_day_sheet_status_reports");

    while(rs.next()){
     PB_cash.setText(rs.getDouble("Handing_Balance_(CASH)")+"");
     String sv = rs.getDouble("Handing_Balance_(CASH)")+"";
     sv =  PB_cash.getText();
     double billNumber = Double.valueOf(sv);
     sv = Double.toString((Double) billNumber);
     PB_cash.setText(sv);
     }
     con.close();

     }catch(Exception ex){
     JOptionPane.showMessageDialog(this, ex.getMessage());
     }

程序卡住Java MySQL

2 个答案: