how to check data is present or not in xamarin database - xamarin.android

Question

Hello everyone i Have implemented sqlite database in xamarin and i need to search taht any specfic data is present or not in database.
I want to check that if data or row is there or not in database according to the album key
Here is my Database class
namespace FacebookAuth
{
class DatabaseHelper
{
Java.IO.File dir = new Java.IO.File(Android.OS.Environment.ExternalStorageDirectory.AbsolutePath + "/Android/data/com.abhijit.testing.app/databases");
public bool createDataBase()
{
try
{
using (var connection = new SQLiteConnection(Path.Combine(dir.AbsolutePath, "album.db")))
{
connection.CreateTable<AlbumTable>();
return true;
}
}
catch (SQLiteException e)
{
return false;
}
}
public bool InsertIntoTable(AlbumTable album)
{
try
{
System.Console.Write("Data Saved Successfully");
using (var connection = new SQLiteConnection(Path.Combine(dir.AbsolutePath, "album.db")))
{
connection.Insert(album);
return true;
}
}
catch (SQLiteException e)
{
return false;
}
}
public List<AlbumTable> getalldata()
{
try
{
using (var connection = new SQLiteConnection(Path.Combine(dir.AbsolutePath, "album.db")))
{
return connection.Table<AlbumTable>().ToList();
}
}
catch (SQLiteException ex)
{
return null;
}
}
public List<AlbumTable> SelectAlbum(string orderid)
{
try
{
using (var connection = new SQLiteConnection(Path.Combine(dir.AbsolutePath, "album.db")))
{
return connection.Query<AlbumTable>("SELECT * From album Where AlbumKey=?", orderid);//not working exception raised that invalid table name
}
}
catch (SQLiteException ex)
{
return null;
}
}
public bool DeleteFromTable(AlbumTable album)
{
try
{
System.Console.Write("Data Saved Successfully");
using (var connection = new SQLiteConnection(Path.Combine(dir.AbsolutePath, "album.db")))
{
connection.Delete(album);
return true;
}
}
catch (SQLiteException e)
{
return false;
}
}
}
}
and the column name for database is as follows
K
class AlbumTable
{
[PrimaryKey]
public string Id { get; set; }
public string ZipFillPath { get; set; }
public string CoverPhotoPath { get; set; }
public string AlbumKey { get; set; }
public string NoOfPages { get; set; }
public string Email { get; set; }
public string LastName { get; set; }
public string FirstName { get; set; }
public string City { get; set; }
public string Address1 { get; set; }
public string ZipPostalCode { get; set; }
public string PhoneNumber { get; set; }
}
How to check that value is present in db or not

Answer 1

Open Android Device Monitor from Tools->Android->Android Device Monitor
Navigate to your database file and copy out the database file into your PC.
You can open the database using any SQLite browser to check whether your data is in the DB. e.g. http://sqlitebrowser.org/

Answer 2

The docs are quite good at giving easy-to-follow instructions.
You need your id column to be an int, then you can use the Get<T>() method
public List<AlbumTable> SelectAlbum(int orderid)
{
try
{
using (var connection = new SQLiteConnection(Path.Combine(dir.AbsolutePath, "album.db")))
{
return connection.Get<AlbumTable>(orderid);
}
}
catch (SQLiteException ex)
{
return null;
}
}
If you wish to use Sql (see next point as to why you may want to), you need to create the table with a defined name, otherwise the name given to the table may well be some programmatically-created non-human-friendly internal gibberish.
[Table("Albums")]
class AlbumTable
{
[PrimaryKey]
public int Id { get; set; }
...
If you have to keep the id column as a string (that is you have no control over the database) you could use a linq get
return connection.Get<AlbumTable>().FirstOrDefault(a => a.Id == orderid);
Note that this loads all the data into memory and so will be horrible for performance if you get a large amount of data in the database as well as loosing the inbuilt advantages of databases - storing and searching data is what they are built for. This is not Entity Framework and so for complex queries, use direct Sql statements as above.