public class JdbcPractice {
    @Test
    public void testInsert() throws SQLException, ClassNotFoundException {
        // 1. 註冊驅動
        Class.forName("com.mysql.jdbc.Driver");

        // 2. 獲取Connection物件
        Connection connection = DriverManager.getConnection(
                "jdbc:mysql://localhost:3306/company_db",
                "root",
                "root");

        // 3. 獲取Statement物件
        Statement stmt = connection.createStatement();

        // 4. 獲取結果集
        String username = "zhangsan";
        String password = "345678";
        String balance = "1000";
        int i = stmt.executeUpdate("INSERT INTO tb_user(`username`, `password`, `balance`) " +
                                               "VALUES('" + username + "', '" + password + "', " + balance + ")");

        // 5. 處理結果集
        System.out.println(i);

        // 6. 釋放資源
        stmt.close();
        connection.close();
    }
}
3.1.2 刪除資料
public class JdbcPractice {
    @Test
    public void testDelete() throws SQLException, ClassNotFoundException {
        // 1. 註冊驅動
        Class.forName("com.mysql.jdbc.Driver");

        // 2. 獲取Connection物件
        Connection connection = DriverManager.getConnection(
                "jdbc:mysql://localhost:3306/company_db",
                "root",
                "root");

        // 3. 獲取Statement物件
        Statement stmt = connection.createStatement();

        // 4. 獲取結果集
        String id = "3";
        int i = stmt.executeUpdate("DELETE FROM tb_user WHERE id=" + id);

        // 5. 處理結果集
        System.out.println(i);

        // 6. 釋放資源
        stmt.close();
        connection.close();
    }
}