query to book for a slot in csharp

To create a booking system that allows users to book a slot, you need to have a database to store the bookings and a front-end interface to allow users to search and book available slots. Here's an example of how you can query a SQL Server database in C# to book a slot:


main.cs
// Connect to the database
SqlConnection connection = new SqlConnection("Data Source=localhost;Initial Catalog=booking_system;User ID=username;Password=password;");
connection.Open();

// Check if the slot is available
SqlCommand cmd = new SqlCommand("SELECT COUNT(*) FROM slots WHERE date = @date AND slot_time = @time", connection);
cmd.Parameters.AddWithValue("@date", "2021-07-01");
cmd.Parameters.AddWithValue("@time", "10:00:00");
int count = (int)cmd.ExecuteScalar();

if (count > 0) {
  Console.WriteLine("Slot is not available");
} else {
  // Book the slot
  SqlCommand cmd2 = new SqlCommand("INSERT INTO bookings (date, slot_time) VALUES (@date, @time)", connection);
  cmd2.Parameters.AddWithValue("@date", "2021-07-01");
  cmd2.Parameters.AddWithValue("@time", "10:00:00");
  cmd2.ExecuteNonQuery();

  Console.WriteLine("Slot booked successfully");
}

// Close the connection
connection.Close();
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In this example, we first connect to the database using a SqlConnection object. We then execute a SQL query to check if a slot is available at a specific date and time. If the slot is not available, we inform the user. If the slot is available, we execute another SQL query to insert a new booking into the database table bookings.

Note that in the example above, we are hard-coding the date and time values. In a real-world scenario, you would need to take user input for the date and time values and sanitize the input to prevent SQL injection attacks.

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