C#•9mo ago

✅ ✅ Using SQLiteDataReader to return one item

public static CodeSession GetCodeSession(int? selectedId)
{
    using SQLiteConnection conn = new SQLiteConnection(dbFile);
    using SQLiteCommand cmd = new SQLiteCommand(conn);

    SQLiteDataReader reader;

    conn.Open();
    cmd.CommandText = "SELECT * FROM logs WHERE Id=$selectedId";
    cmd.Parameters.AddWithValue("$selectedId", selectedId);

    reader = cmd.ExecuteReader();

    CodeSession sess;

    while(reader.Read())
    {
        int id = int.Parse(reader["Id"].ToString());
        string date = reader["Date"].ToString();
        string startTime = reader["StartTime"].ToString();
        string endTime = reader["EndTime"].ToString();
        string duration = reader["Duration"].ToString();

        sess = new()
        {
            Id = id,
            TodaysDate = date,
            StartTime = startTime,
            EndTime = endTime,
            Duration = duration
        };

        return sess;
    }
}

public static CodeSession GetCodeSession(int? selectedId)
{
    using SQLiteConnection conn = new SQLiteConnection(dbFile);
    using SQLiteCommand cmd = new SQLiteCommand(conn);

    SQLiteDataReader reader;

    conn.Open();
    cmd.CommandText = "SELECT * FROM logs WHERE Id=$selectedId";
    cmd.Parameters.AddWithValue("$selectedId", selectedId);

    reader = cmd.ExecuteReader();

    CodeSession sess;

    while(reader.Read())
    {
        int id = int.Parse(reader["Id"].ToString());
        string date = reader["Date"].ToString();
        string startTime = reader["StartTime"].ToString();
        string endTime = reader["EndTime"].ToString();
        string duration = reader["Duration"].ToString();

        sess = new()
        {
            Id = id,
            TodaysDate = date,
            StartTime = startTime,
            EndTime = endTime,
            Duration = duration
        };

        return sess;
    }
}

I'm wanting to return just one item that is pulled from the database by it's ID. The only way I know how to use reader.Read() is inside of a while-loop and have it iterate through all items selected from the database table and then added to a list and returning the list, but I don't know how to use the reader.Read() to just return one item. Thanks

7 Replies

Saber•9mo ago

don't put it in a loop and just call Read once before constructing the object?

Mekasu0124•9mo ago

I found a stack overflow that showed it used in an if statement and so far that's working. Thank you 🙂 I have another question if that's alright

Mekasu0124•9mo ago

When I put in 18:53 for 6:53PM, it kicks this error. This is supposed to calculate the difference in time stamps. So if I put in 18:53 for the start time and 19:33 for the end time, it's supposed to give back the difference between those two times, however, it's saying that input isn't in the correct format for 18:33. What do I have wrong?

MODiX•9mo ago

Mekasu0124

REPL Result: Failure

public static string? IsValidTimeFormat(string input)
{
    TimeSpan dummyOutput;
    while (!TimeSpan.TryParse(input, out dummyOutput))
    {
        Console.ForegroundColor = ConsoleColor.Red;
        Console.WriteLine("[Error] Invalid DateTime Format.");
        Console.WriteLine("Use HH:MM Format");

        Console.ForegroundColor = ConsoleColor.White;
        Console.Write("Your Entry: ");

        input = Console.ReadLine();
        return IsValidTimeFormat(input);
    }

    return dummyOutput.ToString("HH:MM");
}

IsValidTimeFormat("18:53");

public static string? IsValidTimeFormat(string input)
{
    TimeSpan dummyOutput;
    while (!TimeSpan.TryParse(input, out dummyOutput))
    {
        Console.ForegroundColor = ConsoleColor.Red;
        Console.WriteLine("[Error] Invalid DateTime Format.");
        Console.WriteLine("Use HH:MM Format");

        Console.ForegroundColor = ConsoleColor.White;
        Console.Write("Your Entry: ");

        input = Console.ReadLine();
        return IsValidTimeFormat(input);
    }

    return dummyOutput.ToString("HH:MM");
}

IsValidTimeFormat("18:53");

Exception: FormatException

- Input string was not in a correct format.

- Input string was not in a correct format.

Compile: 701.471ms | Execution: 43.111ms | React with ❌ to remove this embed.

Mekasu0124•9mo ago

public static string? IsValidTimeFormat(string input)
{
    TimeSpan dummyOutput;
    while (!TimeSpan.TryParse(input, out dummyOutput))
    {
        Console.ForegroundColor = ConsoleColor.Red;
        Console.WriteLine("[Error] Invalid DateTime Format.");
        Console.WriteLine("Use HH:MM Format");

        Console.ForegroundColor = ConsoleColor.White;
        Console.Write("Your Entry: ");

        input = Console.ReadLine();
        return IsValidTimeFormat(input);
    }

    return dummyOutput.ToString("HH:MM");
}

IsValidTimeFormat("18:53 PM");

public static string? IsValidTimeFormat(string input)
{
    TimeSpan dummyOutput;
    while (!TimeSpan.TryParse(input, out dummyOutput))
    {
        Console.ForegroundColor = ConsoleColor.Red;
        Console.WriteLine("[Error] Invalid DateTime Format.");
        Console.WriteLine("Use HH:MM Format");

        Console.ForegroundColor = ConsoleColor.White;
        Console.Write("Your Entry: ");

        input = Console.ReadLine();
        return IsValidTimeFormat(input);
    }

    return dummyOutput.ToString("HH:MM");
}

IsValidTimeFormat("18:53 PM");

MODiX•9mo ago

Mekasu0124

REPL Error

An error occurred while sending a request to the REPL service. This may be due to a StackOverflowException or exceeding the 30 second timeout. Details: An error occurred while sending the request.

Tried to execute

this code

Accord•9mo ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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✅ ✅ Using SQLiteDataReader to return one item