Can't select data from MySQL database: java.lang.NullPointerException
- by Devel
Hi,
I'm trying to select data from database using this code:
//DATABASE
ResultSet rs;
String polecenie;
Statement st;
String[] subj;
public void polacz() {
try {
Class.forName("com.mysql.jdbc.Driver");
Connection pol=DriverManager.getConnection("jdbc:mysql://localhost:3306/testgenerator", "root", "pospaz");
st = pol.createStatement();
lblPolaczonoZBaza.setText("Polaczono z baza danych testgenerator");
} catch (Exception ek) {
statusMessageLabel.setText("Can't connect to d: "+ek);
}
polecenie = "select * from subjects";
try {
rs = st.executeQuery(polecenie);
int i=0;
while (rs.next()){
subj[i] = rs.getString("name");
i++;
}
st.close();
} catch (Exception ek) {
statusMessageLabel.setText("Can't select data: "+ek);
}
}
The second catch shows exception:
java.lang.NullPointerException
I looked everywhere and I can't find the solution. I'd be grateful for any help.
