将对象输入对话框值传递并解析到数据库 table

Question

I want to know how to get integer value from input dailog box

并在select语句中查询看起来我的错误输入框类型根据我的下面是对象，我不知道如何将对象解析为整数以便被 select 语句接受请告知如何处理对象类型以获取输入框变量并将其注入我的 select

private void InputVal(){

       // here is the input box to retrieve user entry
      Object journal_no = JOptionPane.showInputDialog(
              null,    "Please enter Journal No.?:\n",  "Search", JOptionPane.PLAIN_MESSAGE,
              null,null,"");
      if (journal_no.equals("")){
          JOptionPane.showMessageDialog(null, "Please enter correct No.");
          return;


      }
       // HERE I WILL CALL SQL STATEMENT TO LOAD Table rely on //inputbox 
      try {
  String host1=  "jdbc:derby://localhost:1527//accountsdb";
  String uName1="accounts";
  String uPass1="accounts";
   con1=DriverManager.getConnection(host1,uName1 ,uPass1);
    //String sql ="select * from log where password= jTuser.getText()  " ;

  String sql1="select * from JOUNRAL Where journal_no=" +   journal_no + "  ";
   stmt1=con1.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, 
   ResultSet.CONCUR_UPDATABLE);
       rs=stmt1.executeQuery(sql1);

            while (rs.next()){ 
                //Load values into
             Date Jdate  =rs.getDate("journal_date"); 
            txt_date.setDate(Jdate);
            int JNo;
      JNo = rs.getInt("journal_no");
            jLjournal_no.setText(Integer.toString(JNo));
            }
        } 
        catch (SQLException ex) {
              System.out.println(ex.getMessage())   ;     
}
       }

Answer 1

如果那肯定是一个 int 使用 int journalNo = Integer(ObjectValue);

否则将其转换为字符串，然后再转换为整数。在这种情况下，您将能够捕获 NumberFormatException。

对象到字符串：

String journalNumber = objectValue.toString();

字符串转整数：

int journalNumberAsInt = Integer.parseInt(journalNumber);

Answer 2

如果你想从 String 解析 int 你应该使用 Integer.parseInt() : https://docs.oracle.com/javase/7/docs/api/java/lang/Integer.html#parseInt(java.lang.String)

将对象输入对话框值传递并解析到数据库 table

passing and parsing object input dialog value to database table

java

derby