使用 Android Xamarin SQLite 访问特定列数据

Question

我正在 Xamarin Android 中构建登录活动，并且我已插入所有模块（库和文件）并准备就绪，但我在从表中检索单个对象（实际上是电子邮件）时遇到问题（它已经包含数据)...我的代码解释如下...

//The class that acts as a blueprint to the table is this one
class Person {
       [PrimaryKey, AutoIncrement]
        public int id { set; get; }
        public string name { set; get;}
        public string department { set; get; }
        public  string email { set; get; }
        public string password { set; get; }
            }

处理登录逻辑的文件

class Login : AppCompatActivity
    {
     protected override void OnCreate(Bundle savedInstanceState){
    //Login button definition
  Button login=(Button)FindViewById<Button>(Resource.Id.login);
     //Make the button raise login event on click
    login.Click +=Login;                                                                }
     }
//Button method for login
private void Login(object sender, EventArgs e){
   //Define location that the connection will use to create and store tables
string dbpath = System.IO.Path.Combine(System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal), "dbpersons.db");
 //Define new connection to database using a connection string
  var conn=new SQLite.SQLiteConnection(dbpath);
    try{
          //Microsoft manual says this can access elements of a row using id parameter
        var stock = db.Get<Person>(5);
      // I need code that will let me access email from specific column in table
   }catch(SQLite.SQLiteException m){
    //Display exception in a toast
     Toast.MakeText(Application.Context,m.Message,ToastLength.Long).Show();
    }  
  }
}

我需要该电子邮件与用户将在 ``EditText``` 中输入的另一个值进行比较

Answer 1

您正在从数据库中检索一个对象，因此要访问该对象的属性只需使用该属性

var stock = db.Get<Person>(5);
// I need code that will let me access email from specific column in table
var email = stock.email;