static void Main(string[] args)
{
{
Console.WriteLine("************************");
IHelper helper = new MySqlHelper();
helper.Query <Program>();
helper.Delete <Program>();
helper.Update <Program>();
helper.Add <Program>();
}
{
Console.WriteLine("************************");
IHelper helper = new OracleHelper();
helper.Query <Program>();
helper.Delete <Program>();
helper.Update <Program>();
helper.Add <Program>();
}
{
Console.WriteLine("************************");
IHelper helper = new SqlserverHelper();
helper.Query <Program>();
helper.Delete <Program>();
helper.Update <Program>();
helper.Add <Program>();
}
{
//引入第三方的redis,不适配
Console.WriteLine("************************");
IHelper helper = new RedisHelperInherit();//类适配器
helper.Query <Program>();
helper.Delete <Program>();
helper.Update <Program>();
helper.Add <Program>();
}
{//组合优于继承
Console.WriteLine("***************");
Console.WriteLine("************************");
IHelper helper = new RedisHelperCombination();//对象适配器
helper.Query <Program>();
helper.Delete <Program>();
helper.Update <Program>();
helper.Add <Program>();
}
//都做到了适配,都能新旧适配起来
//组合优于继承 1.继承是强侵入形的 会带过来父类的方法(有多余的东西)
// 2.灵活性问题(组合是依赖抽象的,继承是依赖细节的)
//应用总结:
//属于不救模式,全新引入新的组件要用上的
//不能在项目一开始设计的时候就搞适配器,徒增难度
//时机选择
Console.WriteLine("Hello World!");
}
static void Main(string[] args)
{
try
{
{
IHelper helper = new SqlServerHelper();
helper.Add <Program>();
helper.Delete <Program>();
helper.Query <Program>();
helper.Update <Program>();
}
{
IHelper helper = new OracleHelper();
helper.Add <Program>();
helper.Delete <Program>();
helper.Query <Program>();
helper.Update <Program>();
}
{
IHelper helper = new MysqlHelper();
helper.Add <Program>();
helper.Delete <Program>();
helper.Query <Program>();
helper.Update <Program>();
}
{
//由于Redis是第三方的类库，虽然当中也有增删改查，
//但我们无法直接让其继承IHelper 故而无法像如下使用
//此时我们应当考虑适配器模式
// IHelper helper = new RedisHelper();
// helper.Add<Program>();
// helper.Delete<Program>();
// helper.Query<Program>();
// helper.Update<Program>();
}
{
IHelper helper = new RedisHelperInherit();
helper.Add <Program>();
helper.Delete <Program>();
helper.Query <Program>();
helper.Update <Program>();
RedisHelperInherit helperInherit = new RedisHelperInherit();
helperInherit.AddRedis <Program>(); //强侵入性，继承导致父类有的子类必须也有
}
{
IHelper helper = new RedisHelperCombination();
helper.Add <Program>();
helper.Delete <Program>();
helper.Query <Program>();
helper.Update <Program>();
}
}
catch (Exception e)
{
Console.WriteLine(e.Message);
// throw;
}
}