C#•4mo ago

✅ Getting a single value in sql db

I am currently making a information system for our project in school and I am stuck at the login part wherein I need to get the role value of the username and password so they'll go to their respective panel once they've clicked logged in. I've been searching online and couldn't find an answer. Currently this is my code for my login button that i've followed in Youtube.

private void btnClick(object sender, RoutedEventArgs e)
{
    /* String UN = tbGetter(tbUsernameLogin);
     String PW = tbGetter(tbPasswordLogin);

     panelMaster(validLogin(UN, PW));*/

    var Username = tbUsernameLogin.Text;
    var Password = passwordBox_password.Password;

    using (UserDataContext context = new UserDataContext())
    {
        bool userFound = context.Users.Any(user => user.Name == Username && user.Password == Password);


        if (userFound)
        {
            
            
        }
        else
        {
            MessageBox.Show("User Not Found");
        }

    }



}

private void btnClick(object sender, RoutedEventArgs e)
{
    /* String UN = tbGetter(tbUsernameLogin);
     String PW = tbGetter(tbPasswordLogin);

     panelMaster(validLogin(UN, PW));*/

    var Username = tbUsernameLogin.Text;
    var Password = passwordBox_password.Password;

    using (UserDataContext context = new UserDataContext())
    {
        bool userFound = context.Users.Any(user => user.Name == Username && user.Password == Password);


        if (userFound)
        {
            
            
        }
        else
        {
            MessageBox.Show("User Not Found");
        }

    }



}

The database currently has ID, Name, Password, and Role. I need to get the Role of the current Name and Password that was used to login so i can put it in the panelMaster() so it'll go to their own panel.

29 Replies

Kringe•4mo ago

is the role just a string in the user entity or is it a seperate entity

Shogunex•4mo ago

it's a string

 public class User
 {

     [Key]

     public int Id { get; set; }
     public string Name { get; set; }
     public string Password { get; set; }
     public string Role { get; set; }




 }

 public class User
 {

     [Key]

     public int Id { get; set; }
     public string Name { get; set; }
     public string Password { get; set; }
     public string Role { get; set; }




 }

Kringe•4mo ago

thanks 1 sec

Shogunex•4mo ago

and this is for how my db was created and checked if there's a db

public class UserDataContext: DbContext
{

    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
    {
        optionsBuilder.UseSqlite("Data Source = DataFile.db");
    }

    public DbSet<User> Users { get; set; }

}

public class UserDataContext: DbContext
{

    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
    {
        optionsBuilder.UseSqlite("Data Source = DataFile.db");
    }

    public DbSet<User> Users { get; set; }

}

Kringe•4mo ago

    using (UserDataContext context = new UserDataContext())
    {
                var user = Context.Users.FirstOrDefault(u => u.Name == Username && u.Password == Password);


        if (user != null)
        {
            
                        MessageBox.Show(user.Role);
        }
        else
        {
            MessageBox.Show("User Not Found");
        }
        }

    using (UserDataContext context = new UserDataContext())
    {
                var user = Context.Users.FirstOrDefault(u => u.Name == Username && u.Password == Password);


        if (user != null)
        {
            
                        MessageBox.Show(user.Role);
        }
        else
        {
            MessageBox.Show("User Not Found");
        }
        }

something like this I have written it in notepad so could be some syntax errors

Shogunex•4mo ago

Kringe•4mo ago

im confused why is ur user a list<string> ❓ can you post a screenshot of the full code

Shogunex•4mo ago

ah sorry, it's because of the code of my groupmate made, since he was testing things out without using any database

Shogunex•4mo ago

message.txt

Shogunex•4mo ago

that's the login code

Kringe•4mo ago

ow you still using any

Shogunex•4mo ago

i've sent all the codes that was used for the login it was part of the tutorial that i saw

Kringe•4mo ago

what you are doing is also fine but to get the role you would need to make a second query

Shogunex•4mo ago

i haven't gotten the chance to play around yet since our professor wants it working

Shogunex•4mo ago

like this again?

Shogunex•4mo ago

i was thinking of changing any, but idk what to change it to get the role of the current username and password

Shogunex•4mo ago

this is what's inside the db

Kringe•4mo ago

but if you do this you call the db twice so I reccomend this var user = Context.Users.FirstOrDefault(u => u.Name == Username && u.Password == Password); so you can check if the user exists and then get the role

Shogunex•4mo ago

Ok, I'll test it out

Kringe•4mo ago

the second one I hope 😄

Hass•4mo ago

Why does it makes two calls? Asking bc it seems that it does one Is it because you chain two operations?

Kringe•4mo ago

the code also doesn't work made a mistake but I meant that he first checks if the user exists and then with a separate call gets the role which I recommend doing in one call

Hass•4mo ago

I see, for some reason I thought EF optimized that

Shogunex•4mo ago

Thank you so much! it works

Kringe•4mo ago

nice! I mean you can chain commands I meant var userExist = context.any var role = context.select are 2queries

Shogunex•4mo ago

I'll now be able to continue with adding in the db and searching them thank you so much again!

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✅ Getting a single value in sql db