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 (10,'nameValue')");
        st.executeUpdate("insert into survey (id,name ) values (null,null)");
        st = conn.createStatement();
        ResultSet rs = st.executeQuery("SELECT * FROM survey");

        while (rs.next()) {
            int id = rs.getInt(1);
            System.out.println(id);
            if (rs.wasNull()) {
                id = -1;
            }
            System.out.println(id);
        }
        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", "");
    }
}