Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;

public class Main {
    public static void main(String[] args) throws Exception {
        Connection conn = getConnection();
        Statement st = conn.createStatement();

        st.executeUpdate("create table survey (id int,name varchar(30));");
        st.executeUpdate("insert into survey (id,name ) values (1,'nameValue')");
        st.executeUpdate("insert into survey (id,name ) values (2,null)");
        st = conn.createStatement();
        ResultSet rs = st.executeQuery("SELECT * FROM survey");

        // extract data from the ResultSet
        while (rs.next()) {
            int id = rs.getInt("id");
            System.out.println("id=" + id);
            String name = rs.getString(2);
            System.out.println("name=" + name);
            if (rs.wasNull()) {
                System.out.println("name is null");
            } else {
                System.out.println("name is not null");
            }
            System.out.println("---------------");
        }
        rs.close();
        st.close();
        conn.close();

    }

    private static Connection getConnection() throws Exception {
        Class.forName("org.hsqldb.jdbcDriver");
        String url = "jdbc:hsqldb:mem:data/tutorial";

        return DriverManager.getConnection(url, "sa", "");
    }
}