CODEWITHSUNDEEP
javaswingjframecrudjdialog
Glauber Aguiar
Glauber Aguiar

Reputation: 11

JDIALOG not Seeing Other Classes

I'm currently trying to write a simple CRUD using Java. I've made a separate class to Connect to mySQL Database. I then created a JFrame and I used the extends to bind that class to my JFrame. I also created a JDialog called "FormCadastro", that opens when the user choose some function in a JMenu, at this point everything is working fine, the JDialog appears from JFrame but the problem is that the JDialog class is not seeing my "ConnectDataBase" class, and I need to access it when the user clicks "Register" to send data from JDialog TextFields to my database.

JDialog Class

JButton OkBtn = new JButton("Cadastrar");

OkBtn.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent e)
    {
        String query = "INSERT INTO dados_pessoais(Codigo, Nome, SobreNome, Endereco, Numero, Bairro, Cidade, UF, Email, Celular, Telefone) VALUES( ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)";
        PreparedStatement stmt = con.prepareStatement(query);
        //JDialog does not see "con" variable and PreparedStatement class even if i import it using import Classes.ConnectDataBase,
    }
}

If I use extends ConnectDataBase in the place of JDialog at 

public class FormCadastro extends JDialog

I get a lot of errors, so I don't know what to do to access that DataBase class in my JDialog.

ConnectDataBase Class

public class ConnectDataBase 
{
    private Connection con = null;
    private ResultSet rs = null;

    public void ConnectDataBase() throws ClassNotFoundException
    {
        try
        {
            Class.forName("com.mysql.jdbc.Driver");
            this.con = DriverManager.getConnection("jdbc:mysql://localhost:3306/usuarios", "root", "admin");
            JOptionPane.showMessageDialog(null, "Conexão com o Banco de Dados bem sucedida");
        }
        catch(Exception e)
        {
            JOptionPane.showMessageDialog(null, "Erro ao tentar conectar ao Banco de Dados", "Erro de Conexão", JOptionPane.ERROR_MESSAGE);
        }
    }
}

Upvotes: 0

Views: 47

Answers (1)

Hovercraft Full Of Eels
Hovercraft Full Of Eels

Reputation: 285405

If you want your JDialog-extending class to use the functionality of the ConnectDataBase, then you have to pass a viable ConnectDataBase into the JDialog class, perhaps in its constructor or via a setter method. Using imports does not magically confer ability. You need to use composition.

e.g.,

public class FormCadastro extends JDialog {
    private ConnectDataBase connectDataBase;

    public FormCadastro(ConnectDataBase connectDataBase) {
        this.connectDataBase = connectDataBase;

        JButton OkBtn = new JButton("Cadastrar");
        OkBtn.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String query = "INSERT INTO dados_pessoais (Codigo,Nome,SobreNome,Endereco,Numero,Bairro,Cidade,UF,Email,Celular,Telefone) VALUES ( ?,?,?,?,?,?,?,?,?,?,?)";

                // use public methods of your connectDataBase object here
            }
        });
    }
}

Upvotes: 1

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