You just have to create a method in your form where you fill in your table executing a query where you can query the table you have in your DB and empty that query data in your form table
I'll show you an example method
void mostrarDatos(){
DefaultTableModel model = new DefaultTableModel();
model.addColumn("ID");
model.addColumn("Nombre");
model.addColumn("Edad");
model.addColumn("Sexo");
tabla.setModel(model);
String sql = "SELECT * FROM tablaPersona";
String datos[] = new String[5];
try {
Statement st = cn.createStatement();
ResultSet rs = st.executeQuery(sql);//Aqui ejecuta la consulta
while(rs.next()){//Se hace el llenado de la tabla con los datos que se obtienen de la consulta
datos[0] = rs.getString(1);
datos[1] = rs.getString(2);
datos[2] = rs.getString(3);
datos[3] = rs.getString(4);
model.addRow(datos);
}
tabla.setModel(model);
if(tabla.getModel().getRowCount() == 0){
JOptionPane.showMessageDialog(null, "NO SE ENCONTRO NINGUNA COINCIDENCIA","AVISO",JOptionPane.INFORMATION_MESSAGE);
mostrarDatos("");
}
} catch (SQLException ex) {
JOptionPane.showMessageDialog(null,"Error en la consulta..." + ex.getMessage());
Logger.getLogger(frm_users.class.getName()).log(Level.SEVERE, null, ex);
}
}
