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 {
    static final String JDBC_DRIVER = "com.mysql.jdbc.Driver";
    static final String DB_URL = "jdbc:mysql://localhost/STUDENTS";

    static final String USER = "username";
    static final String PASS = "password";

    public static void main(String[] args) throws Exception {
        Connection conn = null;
        Statement stmt = null;

        Class.forName(JDBC_DRIVER);
        conn = DriverManager.getConnection(DB_URL, USER, PASS);
        System.out.println("Deleting database...");
        stmt = conn.createStatement();

        conn = DriverManager.getConnection(DB_URL, USER, PASS);

        stmt = conn.createStatement();

        String sql = "UPDATE Registration SET age = 30 WHERE id in (1, 2)";
        stmt.executeUpdate(sql);

        sql = "SELECT id, first, last, age FROM Person";
        ResultSet rs = stmt.executeQuery(sql);
        while (rs.next()) {
            // Retrieve by column name
            int id = rs.getInt("id");
            int age = rs.getInt("age");
            String first = rs.getString("firstName");
            String last = rs.getString("lastName");

            // Display values
            System.out.print("ID: " + id);
            System.out.print(", Age: " + age);
            System.out.print(", First: " + first);
            System.out.println(", Last: " + last);
        }
        rs.close();
        stmt.close();
        conn.close();
    }
}