i cant enter the else block

private String kelimeyiCek() {
        String resimURL = null;
        String cumle;

        // Daha önce seçilen kelime ID'sini saklamak için değişken
        int oncekiKelimeID = 0;

        // Bilinenler tablosundan bir kelime seç
        sql = "SELECT ingilizce_kelime, turkce_karsiligi, resim_url, cumle_kullanimi, kelimeID, status, tarih FROM bilinenler WHERE status >= 1 AND kelimeID != ? ORDER BY RAND() LIMIT 1";
        try (PreparedStatement statement = baglanti.prepareStatement(sql)) {
            statement.setInt(1, oncekiKelimeID); // Önceki kelimeyi hariç tut

            ResultSet resultSet = statement.executeQuery();

            if (resultSet.next()) {
                String kelime = resultSet.getString("ingilizce_kelime");
                dogruCevap = resultSet.getString("turkce_karsiligi");
                resimURL = resultSet.getString("resim_url");
                kelimeId = resultSet.getInt("kelimeID");
                cumle = resultSet.getString("cumle_kullanimi");
                status = resultSet.getInt("status");
                upTarih = resultSet.getString("tarih");
                txt_cumle1.setText(cumle);
                txt_sinavKelimesi.setText(kelime);
                txt_statusID.setText(String.valueOf(status));
                txt_upTarihId.setText(upTarih);

                // Önceki kelime ID'sini güncelle
                oncekiKelimeID = kelimeId;
                cumleleriGoster(kelimeId);               
            } else {
                // Bilinenler tablosundan kelime seçilemedi, kalan soruları kelimeler tablosundan al
                sql = "SELECT ingilizce_kelime, turkce_karsiligi, resim_url, cumle_kullanimi, kelimeID, status, tarih FROM kelimeler ORDER BY RAND() LIMIT 1";
                try (PreparedStatement kalanSorularStatement = baglanti.prepareStatement(sql)) {
                    ResultSet kalanSorularResultSet = kalanSorularStatement.executeQuery();

                    if (kalanSorularResultSet.next()) {
                        String kelime = kalanSorularResultSet.getString("ingilizce_kelime");
                        dogruCevap = kalanSorularResultSet.getString("turkce_karsiligi");
                        resimURL = kalanSorularResultSet.getString("resim_url");
                        kelimeId = kalanSorularResultSet.getInt("kelimeID");
                        cumle = kalanSorularResultSet.getString("cumle_kullanimi");
                        status = kalanSorularResultSet.getInt("status");
                        upTarih = kalanSorularResultSet.getString("tarih");
                        txt_cumle1.setText(cumle);
                        txt_sinavKelimesi.setText(kelime);
                        txt_statusID.setText(String.valueOf(status));
                        txt_upTarihId.setText(upTarih);                      
                        cumleleriGoster(oncekiKelimeID);
                        System.out.println("çalıştı");
                    } else {
                        txt_sinavKelimesi.setText("");
                    }
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }

        return resimURL;
    }

What I want to do in these codes is to pull all the data from the "bilinenler" table and then pull the remaining data from the "kelimeler" table, but I can not enter the else block, only the data from the "bilinenler" table appears on the screen. If there is no data in the "bilinenler" table, then the data in the "kelimeler" table is displayed.

I wrote a control method for this problem and tried to use it, but I made my code worse. If you want, you can solve the problem with this control mechanism. I also share this method with you.

private boolean bilinenlerTablosundaSorukalmadiMi() throws SQLException {
        String kontrolSorgusu = "SELECT COUNT(*) AS sayi FROM bilinenler WHERE status >= 1";
        try (PreparedStatement kontrolStatement = baglanti.prepareStatement(kontrolSorgusu)) {
            ResultSet kontrolResultSet = kontrolStatement.executeQuery();
            if (kontrolResultSet.next()) {
                int soruSayisi = kontrolResultSet.getInt("sayi");
                return soruSayisi == 0; // Eğer 0 ise daha fazla soru yok demektir
            }
        }
        return false; // Hata durumu
    }

I want to pull random data from the "kelimeler" table after pulling all the data from the "bilinenler" table. I defined a user input that I had previously determined for this program. For example, when the user requests 10 data, if there are 6 data in the "bilinenler" table, the user will present all of them and select the remaining 4 randomly from the "kelimeler" table.

Answers

It seems like the issue lies in the logic of your kelimeyiCek() method. Let's address the problem step by step.

1. Debugging kelimeyiCek() Method:

   • In your kelimeyiCek() method, you first check if there are any records in the bilinenler table. If there are, you retrieve a random record from there.
   • If there are no records in the bilinenler table, you attempt to retrieve a random record from the kelimeler table.
   • However, you mentioned that you cannot enter the else block, which suggests that there might always be records in the bilinenler table, even if it's empty.

2. Potential Issue:

   • The issue might be related to the initial value of the oncekiKelimeID variable. If oncekiKelimeID is always initialized to 0, then it's likely that there are always records in the bilinenler table because status >= 1 includes all records where status is greater than or equal to 1.

3. Suggested Fix:

   • You need to ensure that oncekiKelimeID is set to 0 only when there are no records in the bilinenler table. Otherwise, it should be set to the ID of the last retrieved record from the bilinenler table.
   • You can achieve this by moving the initialization of oncekiKelimeID outside of the kelimeyiCek() method and ensuring it retains its value across method calls.

Here's how you can modify your code to fix the issue:

// Initialize oncekiKelimeID outside the method
private int oncekiKelimeID = 0;

private String kelimeyiCek() {
    String resimURL = null;
    String cumle;

    // Bilinenler tablosundan bir kelime seç
    sql = "SELECT ingilizce_kelime, turkce_karsiligi, resim_url, cumle_kullanimi, kelimeID, status, tarih FROM bilinenler WHERE status >= 1 AND kelimeID != ? ORDER BY RAND() LIMIT 1";
    try (PreparedStatement statement = baglanti.prepareStatement(sql)) {
        statement.setInt(1, oncekiKelimeID); // Önceki kelimeyi hariç tut

        ResultSet resultSet = statement.executeQuery();

        if (resultSet.next()) {
            // Retrieve data from bilinenler table
            String kelime = resultSet.getString("ingilizce_kelime");
            dogruCevap = resultSet.getString("turkce_karsiligi");
            resimURL = resultSet.getString("resim_url");
            kelimeId = resultSet.getInt("kelimeID");
            cumle = resultSet.getString("cumle_kullanimi");
            status = resultSet.getInt("status");
            upTarih = resultSet.getString("tarih");
            txt_cumle1.setText(cumle);
            txt_sinavKelimesi.setText(kelime);
            txt_statusID.setText(String.valueOf(status));
            txt_upTarihId.setText(upTarih);

            // Önceki kelime ID'sini güncelle
            oncekiKelimeID = kelimeId;
            cumleleriGoster(kelimeId);               
        } else {
            // Bilinenler tablosundan kelime seçilemedi, kalan soruları kelimeler tablosundan al
            sql = "SELECT ingilizce_kelime, turkce_karsiligi, resim_url, cumle_kullanimi, kelimeID, status, tarih FROM kelimeler ORDER BY RAND() LIMIT 1";
            try (PreparedStatement kalanSorularStatement = baglanti.prepareStatement(sql)) {
                ResultSet kalanSorularResultSet = kalanSorularStatement.executeQuery();

                if (kalanSorularResultSet.next()) {
                    // Retrieve data from kelimeler table
                    String kelime = kalanSorularResultSet.getString("ingilizce_kelime");
                    dogruCevap = kalanSorularResultSet.getString("turkce_karsiligi");
                    resimURL = kalanSorularResultSet.getString("resim_url");
                    kelimeId = kalanSorularResultSet.getInt("kelimeID");
                    cumle = kalanSorularResultSet.getString("cumle_kullanimi");
                    status = kalanSorularResultSet.getInt("status");
                    upTarih = kalanSorularResultSet.getString("tarih");
                    txt_cumle1.setText(cumle);
                    txt_sinavKelimesi.setText(kelime);
                    txt_statusID.setText(String.valueOf(status));
                    txt_upTarihId.setText(upTarih);                      
                    cumleleriGoster(oncekiKelimeID);
                    System.out.println("çalıştı");
                } else {
                    txt_sinavKelimesi.setText("");
                }
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    } catch (SQLException e) {
        e.printStackTrace();
    }

    return resimURL;
}

By initializing oncekiKelimeID outside the method and updating its value based on the last retrieved record from the bilinenler table, you should be able to correctly retrieve data from both tables as intended.