SQLite/SQLite_Console/SQLite_Console/Program.cs

using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SQLite;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace SQLite_Console
{
	class Program
	{
		static void Main(string[] args)
		{
			string connString = @"Data Source = D:\SQLite\mydb.db";
			using (SQLiteConnection conn = new SQLiteConnection(connString))
			{
				Stopwatch watch = new Stopwatch();
				watch.Start();

				conn.Open();

				watch.Stop();
				Console.WriteLine($"open: {watch.ElapsedMilliseconds}ms");
				Console.WriteLine();
				watch.Restart();

				Random rnd = new Random();
				for (int i = 0; i < 2000; i++)
				{
					string guid = Guid.NewGuid().ToString();
					int age = rnd.Next(1, 100);
					string name = $"Robot#{i + 1}";
					string insertQry = $"INSERT INTO member VALUES ('{name}', {age}, '{guid}')";
					SQLiteCommand cmd = new SQLiteCommand(insertQry, conn);
					cmd.ExecuteNonQuery();
				}

				watch.Stop();
				Console.WriteLine($"insert: {watch.ElapsedMilliseconds}ms");
				Console.WriteLine();
				watch.Restart();

				DataSet ds = new DataSet();
				string selectQry = "SELECT * FROM member";
				SQLiteDataAdapter adt = new SQLiteDataAdapter(selectQry, conn);
				adt.Fill(ds);

				DataRowCollection rows = ds.Tables[0].Rows;
				PrintRows(rows);

				watch.Stop();
				Console.WriteLine($"select all: {watch.ElapsedMilliseconds}ms");
				Console.WriteLine();
				watch.Restart();

				selectQry = "SELECT * FROM member WHERE age < 50";
				adt = new SQLiteDataAdapter(selectQry, conn);
				adt.Fill(ds);

				rows = ds.Tables[0].Rows;
				PrintRows(rows);

				watch.Stop();
				Console.WriteLine($"select under 50: {watch.ElapsedMilliseconds}ms");
				Console.WriteLine();
				watch.Restart();
			}

			Console.ReadKey();
		}

		private static void PrintRows(DataRowCollection rows)
		{
			Console.WriteLine($"found {rows.Count} rows.");
			foreach (DataRow row in rows)
			{
				string name = (string)row["name"];
				long age = DBNull.Value.Equals(row["age"]) ? -1 : (long)row["age"];
				string guid = (string)row["guid"];

				Console.WriteLine($"name: {name}, age: {age}, guid: {guid}");
			}
		}
	}
}