HyperCube/MySQLConnector.cs

using System;
using System.Collections.Generic;
using System.Threading.Tasks;
using HyperCube.Models;
using MySql.Data.MySqlClient;

namespace HyperCube
{
    public class MySQLConnector
    {
        private MySQLConnector(){ }

        private readonly string Server = "dmatter.net";
        private readonly string DatabaseName = "documents";
        private readonly string UserName = "promsystem";
        private readonly string Password = "PrmSystem212";

        MySqlCommand SQLcom;

        public MySqlConnection Connection { get; set; }

        private static MySQLConnector _instance = null;
        public static MySQLConnector Instance()
        {
            if (_instance == null)
                _instance = new MySQLConnector();
            return _instance;
        }

        public bool IsConnect()
        {
            if (Connection == null)
            {                
                string connstring = $"Server={Server}; database={DatabaseName}; UID={UserName}; password={Password}";
                Connection = new MySqlConnection(connstring);
                Connection.Open();
            }
            else if (Connection.State != System.Data.ConnectionState.Open)            
                Connection.Open();

            return true;
        }

        public long SQLInsert(string sql)
        {
            long lastID = 0;

            bool connected = IsConnect();
            if (connected)
            {
                SQLcom = new(sql, Connection);
                SQLcom.ExecuteNonQuery();
                SQLcom.Dispose();
                lastID = SQLcom.LastInsertedId;
            }
            else
                Console.WriteLine("Not connected to DB.");

            return lastID;
        }        

        public async Task<Dictionary<string, AccountModel>> SQLSelectASPUsers()
        {
            string sql = "select * from aspnetusers";
            Dictionary<string, AccountModel> accs = new();

            bool connected = IsConnect();
            if (connected)
            {
                SQLcom = new(sql, Connection);
                MySqlDataReader rdr = SQLcom.ExecuteReader();

                while (rdr.Read())
                {
                    AccountModel newacc = new ();
                    newacc.UUID = rdr.GetString(0); 
                    newacc.Name = rdr.GetString(1);
                    newacc.Email = rdr.GetString(3);
                    if (!rdr.IsDBNull(15))
                        newacc.eth_address = rdr.GetString(15);
                    if (!accs.ContainsKey(newacc.UUID))
                        accs.Add(newacc.UUID, newacc);
                }

                await Task.WhenAll();
                rdr.Close();
                return accs;
            }
            else
                Console.WriteLine("Not connected to DB.");

            return null;
        }

        public async Task<Dictionary<int, SmartContract>> SQLSelectContracts()
        {
            string sql = "select * from smart_contracts";
            Dictionary<int, SmartContract> contracts = new();

            bool connected = IsConnect();
            if (connected)
            {
                SQLcom = new(sql, Connection);
                MySqlDataReader rdr = SQLcom.ExecuteReader();

                while (rdr.Read())
                {                   
                    var id = rdr.GetInt32(0);
                    var code = rdr.GetString(1);
                    var bytecode = rdr.GetString(2);
                    var name = rdr.GetString(3);

                    SmartContract contract;
                    if (name == "Verify")
                        contract = new VerifyContract(id, name, code, bytecode);
                    else
                        contract = new SmartContract(id, name, code, bytecode);

                    if (!rdr.IsDBNull(6))
                    {
                        contract.Address = rdr.GetString(6);
                    }                    
                    Console.WriteLine($"SQLSelectContracts rdr Read {contract.Name}");
                    if (!contracts.ContainsKey(contract.ID))
                        contracts.Add(contract.ID, contract);
                    if (!Blockchain.GetMain().contractNames.ContainsKey(name))
                        Blockchain.GetMain().contractNames.Add(name, contract);                    
                }

                await Task.WhenAll();
                rdr.Close();
                return contracts;
            }
            else
                Console.WriteLine("Not connected to DB.");

            return null;
        }

        public async Task<Dictionary<int, ArticleModel>> SQLSelectArticles(string sql)
        {
            Dictionary<int, ArticleModel> articleModels = new();
            Models.ArticleModel articleModel;

            bool connected = IsConnect();
            if (connected)
            {
                SQLcom = new(sql, Connection);
                MySqlDataReader rdr = SQLcom.ExecuteReader();

                while (rdr.Read()) ///id, filename, article_name, date_publish, action_type/status
                {                    
                    articleModel = new();
                    articleModel.ID = rdr.GetInt32(0);
                    articleModel.Filename = rdr.GetString(1);
                    articleModel.Name = rdr.GetString(2);
                    articleModel.PublishDate = rdr.GetDateTime(3);
                    articleModel.Authors = rdr.GetString(4);
                    articleModel.Status = (ArticleStatus)rdr.GetInt32(5);

                    if (articleModels.ContainsKey(articleModel.ID))
                        continue;

                    articleModels.Add(articleModel.ID, articleModel);
                }

                await Task.WhenAll();
                rdr.Close();
                return articleModels;
            }
            else
                Console.WriteLine("Not connected to DB.");

            return null;
        }
        const string typeguid = "System.Guid";

        public async Task<List<Dictionary<string, object>>> SQLSelectComplex(string request)
        {
            bool connected = IsConnect();
            if (connected)
            {
                List<Dictionary<string, object>> retval = new List<Dictionary<string, object>>();
                SQLcom = new(request, Connection);
                try
                {
                    MySqlDataReader Reader = SQLcom.ExecuteReader();
                    while (Reader.Read())
                    {
                        Dictionary<string, object> data = new Dictionary<string, object>();

                        for (int i = 0; i < Reader.FieldCount; i++)
                        {
                            if (!Reader.IsDBNull(i))
                            {
                                data.Add(Reader.GetName(i), Reader.GetValue(i));
                            }
                            else
                            {
                                //Console.WriteLine(Reader.GetName(i)+": GetDataTypeName " + Reader.GetDataTypeName(i) + " GetFieldType " + Reader.GetFieldType(i).ToString());
                                if (Reader.GetFieldType(i).ToString() == typeguid)
                                {
                                    data.Add(Reader.GetName(i), "00000000-0000-0000-0000-000000000000");
                                }
                                else if (Reader.GetName(i) == "mac_address")
                                {
                                    data.Add(Reader.GetName(i), "00-00-00-00-00-00");
                                }
                                else
                                {
                                    data.Add(Reader.GetName(i), null);
                                }
                            }
                        }
                        retval.Add(data);
                    }
                    await Task.WhenAll();
                    Reader.Close();
                }
                catch (Exception e)
                {
                    Console.Write("SQL Exception 5.1 " + e.Message + " query " + request + "stack trace" + e.StackTrace);
                }
                return retval;
            }
            return null;
        }

        public async Task<ArticleModel> SQLSelectArticle(string sql)
        {
            ArticleModel articleModel = new();

            bool connected = IsConnect();
            if (connected)
            {
                SQLcom = new(sql, Connection);
                MySqlDataReader rdr = SQLcom.ExecuteReader();

                while (rdr.Read())  ///id, filename, article_name, authors, date_publish, annotation, keywords, action_type/status, rating
                {
                    articleModel.ID = rdr.GetInt32(0);
                    articleModel.Filename = rdr.GetString(1);
                    articleModel.Name = rdr.GetString(2);
                    articleModel.Authors = rdr.GetString(3);
                    articleModel.PublishDate = rdr.GetDateTime(4);
                    articleModel.Annotation = rdr.GetString(5);
                    articleModel.Keywords = rdr.GetString(6);
                    articleModel.Status = (ArticleStatus)rdr.GetInt16(7);
                    if (!rdr.IsDBNull(8)) articleModel.Rating = rdr.GetInt16(8);
                }
                await Task.WhenAll();
                rdr.Close();
                return articleModel;
            }
            else
                Console.WriteLine("Not connected to DB.");

            return null;
        }

        public async Task<string> SQLSelectUUID(string sql)
        {
            bool connected = IsConnect();
            if (connected)
            {
                SQLcom = new(sql, Connection);
                object obj = await SQLcom.ExecuteScalarAsync();
                return obj.ToString();
            }
            else return "";
        }

        public async Task<int> SQLSelectCount(string sql)
        {
            bool connected = IsConnect();
            if (connected)
            {
                SQLcom = new(sql, Connection);
                object obj = await SQLcom.ExecuteScalarAsync();
                int count = int.Parse(obj.ToString());
                return count;
            }
            else return 0;
        }

        public void Close()
        {
            Connection.Close();
        }
    }
}