I want to display my record in the consol of netbeans. I have two Column: "naam" and "AantalTespelenRondes". I want to display them + the records of the database. Here is my code of connecting to the database through code.
I work with a List where it saves the data of the database. But when I exucute I get this
[domein.Spel@bddc6, domein.Spel@b0cf230]
And that are not the records. How can I show the records + column names in the consol of netbeans
private final static String LEES_SPELERS_SQL = "SELECT Naam, AantalTeSpelenRondes FROM Spel";
public List<Spel> geefSpel()
{
List<Spel> spelLijst = new ArrayList<Spel>();
//create Statement for querying database
Statement statement;
Connection connection = PersistentieController.getInstance().getConnection();
try
{
statement = connection.createStatement();
// query database
ResultSet resultSet = statement.executeQuery(LEES_SPELERS_SQL);
while (resultSet.next())
{
String Naam = resultSet.getString("Naam");
int AantalRondes = resultSet.getInt("AantalTeSpelenRondes");
Spel spel = new Spel(Naam,AantalRondes);
spelLijst.add(spel);
}
statement.close();
// return Spel;
} catch (SQLException e)
{
e.printStackTrace();
}
return spelLijst;
I work with a List where it saves the data of the database. But when I exucute I get this
[domein.Spel@bddc6, domein.Spel@b0cf230]
You're currently printing the Spel
object reference and it will use toString
method. Since you haven't overridden it, it will use Object#toString
.
You have two approaches to solve this problem :
Override toString
method in Spel
class:
@Override public String toString() { //assuming this class has Naam and aantalRondes fields //replace by the real fields in your class return "{ Naam: " + naam + ", AantalRondes: " + aantalRondes + "}"; }
Go through every element in the List
and manually print the desired data:
for (Spel spel : spelLijst) { //use the format you want/need System.out.println(spel.getNaam() + " " + spel.getAantalRondes()); }
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.