如何在Windows 10 C＃中更新sqlite.net pcl中的行？

Question

I have ID of Row then I will update other values.

I don't know how to update my values! My Table:

 class MyTable
{
    [PrimaryKey, AutoIncrement]
    public int Id { get; set; }
    public string Date { get; set; }
    public string Volumes { get; set; }
    public string Price { get; set; }
}

other information:

 string path;
    SQLite.Net.SQLiteConnection conn;

    public updatepage()
    {
        this.InitializeComponent();
        path = Path.Combine(Windows.Storage.ApplicationData.Current.LocalFolder.Path, "ccdb.sqlite");

        conn = new SQLite.Net.SQLiteConnection(new SQLite.Net.Platform.WinRT.SQLitePlatformWinRT(), path);

        conn.CreateTable<MyTable>();
    }

Answer 1

I recently started working with UWP apps, and also came across this problem. So, how to update a row using SQLite in UWP you ask? Here ya go!

using (var dbConn = new SQLiteConnection(new SQLite.Net.Platform.WinRT.SQLitePlatformWinRT(), App.DB_PATH))
    {
        var existingUser = dbConn.Query<User>("select * from User where Id = ?", user.Id).FirstOrDefault();
        if (existingUser != null)
        {
            existingUser.Name = user.Name;
            existingUser.Email = user.Email;
            existingUser.Username = user.Username;
            existingUser.Surname = user.Surname;
            existingUser.EmployeeNumber = user.EmployeeNumber;
            existingUser.Password = user.Password;
            dbConn.RunInTransaction(() =>
            {
                dbConn.Update(existingUser);
            });
        }
    }

The App.DB_PATH is the same as your 'path' variable. I realize that there are many different areas of interest in this answer, so if you have any further questions, feel free to ask.

Answer 2

To only update a specific set of values in a row, then executing a raw SQL query would be simpler:

conn.Execute("UPDATE MyTable SET Price = ? Where Id = ?", 1000000, 2);

This assumes the input you are passing to the execute statement has been cleaned.