Please help in my first jdbc code

Question

hi,
in this code i want to get author book name from my database
but the problem that : the compiler give error on these lines :
statement= connection.createStatement();
ResultSet resultset = statement.executeQuery("");
statement.close();
please see my code and help me
import java.awt.Container;
import java.beans.Statement;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
public class DisplayAuthors extends JFrame {
    static final String JDBC_DRIVER = "";
    static final String DATABASE_URL="JDBC:db2j:library";
    private Connection connection;
    private Statement statement;
    public DisplayAuthors(){
        try{
            System.setProperty("db2j.system.home", "C:/Documents and Settings/beshoy/My Documents/NetBeansProjects/JDBC");
            Class.forName(JDBC_DRIVER);
            connection=DriverManager.getConnection(DATABASE_URL);
            statement=  (Statement) connection.createStatement();
            ResultSet resultset/*=statement.executeQuery("")*/;
            StringBuffer results= new StringBuffer();
            ResultSetMetaData metadata=resultset.getMetaData();
            int numberofcol=metadata.getColumnCount();
            for(int i=0;i<numberofcol;++i){
                results.append(metadata.getCatalogName(i)+"\t");
            results.append("\n");
            while(resultset.next()){
                for(int i=1;i<=numberofcol;++i){
                    results.append(resultset.getObject(i)+"\t");
                results.append("\n");
            JTextArea area=new JTextArea(results.toString());
            Container container=getContentPane();
            container.add(new JScrollPane(area));
            setSize(300,100);
            setVisible(true);
        catch(ClassNotFoundException classnotfound){
            JOptionPane.showMessageDialog(null,classnotfound.getMessage(),"Database error",JOptionPane.ERROR_MESSAGE);
            System.exit(1);
        catch(ClassNotFoundException classnotfound){
            JOptionPane.showMessageDialog(null,classnotfound.getMessage(),"Driver not found", JOptionPane.ERROR_MESSAGE);
            System.exit(1);
        finally{
            try{
                statement.close();
                connection.close();
            catch(SQLException sqlexception){
                JOptionPane.showMessageDialog(null, sqlexception.getMessage(),"Database error",JOptionPane.ERROR_MESSAGE);
                System.exit(1);
    public static void main(String[]args){
        DisplayAuthors window=new DisplayAuthors();
        window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}thanks in advance

Answer 1

beshoy wrote:
Compiling 1 source file to C:\Documents and Settings\beshoy\My Documents\NetBeansProjects\JDBC\build\classes
C:\Documents and Settings\beshoy\My Documents\NetBeansProjects\JDBC\src\project\DisplayAuthors.java:30: incompatible types
found : java.sql.Statement
required: java.beans.Statement
statement= connection.createStatement();You declared 'statement' as java.beans.Statement instead of java.sql.Statement. The Connection#createStatement() returns java.sql.Statement, not java.beans.Statement.
How did you miss this one in the JDBC tutorial? [http://java.sun.com/docs/books/tutorial/jdbc/index.html]
C:\Documents and Settings\beshoy\My Documents\NetBeansProjects\JDBC\src\project\DisplayAuthors.java:31: cannot find symbol
symbol : method executeQuery(java.lang.String)
location: class java.beans.Statement
ResultSet resultset = statement.executeQuery("");This one will solve itself if you fix the first error.
C:\Documents and Settings\beshoy\My Documents\NetBeansProjects\JDBC\src\project\DisplayAuthors.java:68: cannot find symbol
symbol : method close()
location: class java.beans.Statement
statement.close();This one will solve itself if you fix the first error.