OSql clone written in C# (BetterOSql).

Program.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Data;
using System.Data.SqlClient;

namespace BetterOSql
{
    class Program
    {
        static int Main(string[] args)
        {
            Console.WriteLine("* args");
            foreach (var arg in args) System.Console.WriteLine(arg);
            if (args.Length == 0) { System.Console.WriteLine("args is empty...."); }
            var opts = ParseArgs(args);
            if (!opts.ContainsKey("connection-string")) throw new InvalidOperationException("Connection string required: --connection-string=\"Data Source=(local);User ID=USERID;password=PASSWORD;Initial Catalog=INITIALCATALOG;\"");
            if (!opts.ContainsKey("query") && !opts.ContainsKey("query-file")) throw new InvalidOperationException("Query required: --query=\"select * from TABLE\" OR --query-file=path.sql");

            var query = "";
            if (opts.ContainsKey("query"))
            {
                query = opts["query"];
            }
            else if (opts.ContainsKey("query-file"))
            {
                query = System.IO.File.ReadAllText(opts["query-file"].Replace("/", "\\"));
            }

            try
            {
                PrintResults(query, opts["connection-string"]);
            }
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
                return -1;
            }

            return 0;
        }

        static void PrintResults(string query, string connectionString)
        {
            var reader = ExecuteReader(query, connectionString);
            Console.WriteLine("* Query");
            Console.WriteLine("#+begin_src sql");
            Console.WriteLine(query.Trim());
            Console.WriteLine("#+end_src");
            while (reader.HasRows)
            {
                Console.WriteLine("* Result");
                while (reader.Read())
                {
                    Console.WriteLine("** Row");
                    for (int i = 0; i < reader.FieldCount; i++)
                    {
                        var name = reader.GetName(i);
                        var value = reader.GetValue(i).ToString();
                        Console.WriteLine($"*** {name}: {value}");
                    }
                }
                reader.NextResult();
            }
        }

        static Dictionary<string, string> ParseArgs(string[] args)
        {
            var results = new Dictionary<string, string>();
            foreach (var arg in args)
            {
                var key = arg.Split('=').First().Replace("--", "");
                var value = string.Join("=", arg.Split('=').Skip(1).Take(int.MaxValue));
                results.Add(key, value);
            }
            return results;
        }

        public static SqlDataReader ExecuteReader(string query, string connectionString)
        {
            SqlCommand sqlCommand = new SqlCommand();
            sqlCommand.Connection = new SqlConnection(connectionString);
            sqlCommand.Connection.Open();
            sqlCommand.CommandText = String.Format(query);
            return sqlCommand.ExecuteReader(CommandBehavior.CloseConnection);
        }
    }
}