Question

I have tried all the solutions that have been provided including using PRAGMA but i can’t seem to get it to work!!! I have a program that allows the user to create a table name it and manually enter column names that they wish. I need to some how obtain the column names from the selected table. I need by “Private void loadDB” function to do this. As you can see i have used a bunch of ways of trying to get it to work however it wont extract the names.

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Font;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTable;
import javax.swing.SwingConstants;
import javax.swing.border.EmptyBorder;
import javax.swing.border.LineBorder;


public class ViewTable extends JFrame {

    private static final long serialVersionUID = 1L;
    private static final String PREFERRED_LOOK_AND_FEEL = null;
    private final String tableName;
    private String[] columnNames;
    private String[][] data;
    private JTable tablePane;

    public ViewTable(String tableName){
        this.tableName=tableName;

        initComponents();
        loadDB();
        displayTable();

        setDefaultCloseOperation(CreateTemplate.EXIT_ON_CLOSE);
        setSize(700,700);
        setTitle("View Table");
        setVisible(true);


    }

    private void initComponents() {
        JPanel mainPanel = new JPanel(new BorderLayout());
        this.add(mainPanel);
        mainPanel.setBackground(Color.yellow);

        JPanel topPanel = new JPanel(new BorderLayout());
        topPanel.setBackground(Color.blue);
        mainPanel.add(topPanel,BorderLayout.NORTH);

        JLabel titleLabel = new JLabel(this.tableName);
        titleLabel.setBorder(new LineBorder(Color.black));
        titleLabel.setFont(new Font("Helvetica", Font.BOLD, 24));
        titleLabel.setForeground(Color.orange);
        titleLabel.setHorizontalAlignment(SwingConstants.CENTER);
        topPanel.add(titleLabel,BorderLayout.CENTER);

        JButton exitButton = new JButton("Finish");
        exitButton.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent event){
                close_window();
            }
        });
        exitButton.setBorder(new EmptyBorder(new Insets(20,20,20,20)));
        topPanel.add(exitButton,BorderLayout.EAST);

    }

    private void close_window(){ this.dispose(); }

    private void loadDB(){
        //String com = "SELECT sql from sqlite_master WHERE tbl_name = '"+tableName+"' AND type = 'table'";
        //String com = "PRAGMA table_info( "+tableName+" );";
        //String com = "INSERT null";
        //SQLCommands.SQLCommand(com);
        //String com = "SELECT * FROM sqlite_master";
        //String[] output = SQLCommands.returnSQLCommand(com);
        //String com = "SELECT * FROM (PRAGMA table_info("+tableName+");"; 
        //String[] output = SQLCommands.returnSQLCommand(com);

        //for (String S : output){ System.out.println(S); JOptionPane.showInputDialog("Enter template name"); }


        //get column names
        //columnNames = new String[3];
        //columnNames[0] = "Name"; columnNames[1] = "Surname"; columnNames[2] = "Sex";

        //use column names to populate data
        //e.g. data[4][0] => "SELECT Name FROM tableName"[4]

    }

    private void displayTable(){
        //use JTable

        //new JScrollPane which uses the table

        //put JScrollpane in CENTER box

    }

    public static void main(String[] args){
        String [] tableNames = SQLCommands.returnSQLCommand("SELECT name FROM sqlite_master");
        new ViewTable(tableNames[9]);
    }

}

Answer 1

PRAGMA table_info(table_name);

will do the trick ?

SQL Lite PRAGMA