使用Object []方法返回数组

Question

I have a method that is supposed to populate a JComboBox with data gathered from my database, but the only way I've seen to be able to grab the info from the database, is in an Array. And I need to convert the array to object[] before I can completely compile my program. Is there any way to actually do this? Or is this going to be a long process? My code is as below.

public Object[] getId() {
  Connection con;
  Statement stmt;
  ResultSet rs;

  //Object[] returnId;
  Array returnId;
  try {
    Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
    con = DriverManager.getConnection("jdbc:odbc:collegesys","root","0blivi0n");

    stmt = con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_READ_ONLY);
    rs = stmt.executeQuery("SELECT `id` FROM main");

    while(rs.next()) {
      returnId = rs.getArray("id");
    }

    con.close();
  } catch(Exception e) {
    e.printStackTrace();
  }
  return returnId.toObject();
}

Answer 1

Try this:

 
 
 
  
  return (Object[]) returnId.getArray();
 
  

I gather that you want to collect the value of the "id" column from all rows of table main . Your code will not do that as it's organized. Try this instead:

public Object[] getId() {
  Connection con;
  Statement stmt;
  ResultSet rs;

  //Object[] returnId;
  ArrayList<Object> returnId = new ArrayList<Object>();
  try {
    Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
    con = DriverManager.getConnection("jdbc:odbc:collegesys","root","0blivi0n");

    stmt = con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_READ_ONLY);
    rs = stmt.executeQuery("SELECT `id` FROM main");

    while(rs.next()) {
      returnId.add(rs.getObject("id"));
    }

    con.close();
  } catch(Exception e) {
    e.printStackTrace();
  }
  return returnId.toArray(new Object[returnId.size()]);
}

Of course, if you have a better idea of the data type in column id , you can be more specific about the return type and how you get the value (eg, String[] and rs.getString("id") or Integer[] and rs.getInt("id") ).