Question

I have a SQL Table “Roles” in DB. I want to find out if user have one or more Roles (Admin/User) and then do something with a value if user have 2 Roles at time.

Problem: I cant get all Values from Database, I getting just a first one.

can I do it with foreach loop? I dont have it here but i’m looking for solution.

like:

            cmd = new SqlCommand();
            cmd.Connection = connection;
            cmd.CommandType = System.Data.CommandType.Text;
            cmd.CommandText = @"SELECT Role "
                                  + " FROM UsersRole "
                                  + " WHERE UserName = @UserName ";
            cmd.Parameters.Add(new SqlParameter("@UserName", username));

            reader = cmd.ExecuteReader();

            if (reader.HasRows)
            {
                while (reader.Read())
                {
                    if (reader["Role"] != DBNull.Value)
                    {
                        Role = Convert.ToString(reader["Role"]);
                        if(Role == UserRole.Admin.ToString())
                        {
                            IsAdmin = true;
                        }
                        if (Role == UserRole.User.ToString())
                        {
                            IsUser = true;
                        }
                    }
                    else
                    {
                        Role = "";
                    }
                }
            }
            reader.Close();

IS it possible to access Table in DB with C# code or I can do it different?

Thanks and take care,
Ragims

Answer 1

If you’re using “straight” ADO.NET (no ORM, no Linq-to-SQL or something), then your code would have to look something like this:

// you pass in a UserID (numeric), you get back a list of roles that user has
public List<string> GetRolesForUser(int userID)
{    
   // SQL select statement - adjust as needed 
   string selectStmt = "SELECT Role FROM dbo.UserRole WHERE UserID = @YourUserID";

   // create the resulting list of roles
   List<string> _allRoles = new List<string>();

   // define SqlConnection and SqlCommand to grab the data
   using(SqlConnection _con = new SqlConnection('your connection string here'))
   using(SqlCommand _cmd = new SqlCommand(selectStmt, _con))
   {
       // define the parameter for your SQL statement and fill the value
       _cmd.Parameters.Add("@YourUserID", SqlDbType.Int);
       _cmd.Parameters["@YourUserID"].Value = userID;

       _con.Open();

       // create SqlDataReader to grab the rows
       using(SqlDataReader rdr = _cmd.ExecuteReader())
       {
           // loop over all rows returned by SqlDataReader
           while(rdr.Read())
           {
              // grab the column no. 0 (corresponds to "Role" from your
              // SQL select statement) as a string, and store it into list of roles
              _allRoles.Add(rdr.GetString(0));
           }
       }
   }    

   return _allRoles;
}