How and put data frrom DB into JFrame.tables ?

Question

hello,
I tried to get rows from a DB into a table. Therefore I created a class(A) with a function(a1) throws SQLException. Connect and select rows from the DB runs perfectly. Now I want to put this data into a table. I created another class(B) extends JFrame with an inner class(icB1) extends AbstractTableModel. From here I tried call A.a1 to get the rows but
1. the return type should be StringArray, how should i declare a function returning type stringarray and
2. I tried to put the data into a String, so that the return value is String(Iwould try sort the data after returning values) like
" icB1 extends AbstractTableModel { A.a1(); }" then i get the error msg: "java.sql.SQLException; must caught or declared to be thrown". Then i tried with this: " try { statement } catch { statement }" but it also doesnt func .. So how put I data from a DB into a table ? the main idea is to show and manage DB tables from the web. Many Thanks
regards erkan

Answer 1

Hi Erkan
Here's parts of a simple tutorial style app that shows how to easily get data from a DB into a table. Note that the code is incomplete and may have typos.
public class SQLHandler {
  public List getData(String sql, List headers) {
    List result = new ArrayList();
    ResultSet rs = connection.executeQuery(sql);
    // Get column details
    ResultSetMetaData rsmd = rs.getMetaData();
    int columns = rsmd.getColumnCount();
    for (int i=0;i<columns;i++) {
      headers.add(rsmd.getColumnLabel(i+1));
    while(rs.next()) {
      Object array = new Object[columns];
      for(int i=0;i<columns;i++) {
        array[i] = rs.getObject(i+1); 
      list.add(array):
    return result;
public class SQLDataTableModel implements AbstractTableModel {
  private List data;
  private List headers = new ArrayList();
  public SQLDataTableModel(String sql) {
     data = sqlHandler.getData(sql,headers);
  // abstract methods
  public int getRowCount() {
    return list.size();
  public int getColumnCount() {
    return headers.size();
  public Object getValueAt(int row, int column) {
    Object[] array = data.get(row);
    return array[column];
// Create JTable and assign a model
JTable table = new JTable();
table.setModel( new SQLDataTableModel("select * from table")):cheers
Dave