LevelOS-Core/DAL/DALLConfig.cs

using Microsoft.Data.SqlClient;
using MLL;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;

namespace DALL
{
    public class DALLConfig
    {
        private readonly string connectionString;

        public DALLConfig(string conexao)
        {
            connectionString = conexao;
        }

        #region CRUD

        public bool Inserir(ModeloConfig modelo)
        {
            try
            {
                using SqlConnection conn = new(connectionString);

                PropertyInfo[] props =
                    typeof(ModeloConfig)
                    .GetProperties()
                    .Where(p => p.Name != "ID_CONFIG")
                    .ToArray();

                string colunas =
                    string.Join(",",
                    props.Select(p => p.Name));

                string parametros =
                    string.Join(",",
                    props.Select(p => "@" + p.Name));

                string sql = $@"
                INSERT INTO Config
                (
                    {colunas}
                )
                VALUES
                (
                    {parametros}
                )";

                using SqlCommand cmd =
                    new(sql, conn);

                PreencherParametros(cmd, modelo);

                conn.Open();

                return cmd.ExecuteNonQuery() > 0;
            }
            catch
            {
                return false;
            }
        }

        public bool Alterar(ModeloConfig modelo)
        {
            try
            {
                using SqlConnection conn = new(connectionString);

                PropertyInfo[] props =
                    typeof(ModeloConfig)
                    .GetProperties()
                    .Where(p => p.Name != "ID_CONFIG")
                    .ToArray();

                string sets =
                    string.Join(",",
                    props.Select(p =>
                    $"{p.Name}=@{p.Name}"));

                string sql = $@"
                UPDATE Config
                SET
                    {sets}
                WHERE ID_CONFIG=@ID_CONFIG";

                using SqlCommand cmd =
                    new(sql, conn);

                PreencherParametros(cmd, modelo);

                cmd.Parameters.AddWithValue(
                    "@ID_CONFIG",
                    modelo.ID_CONFIG);

                conn.Open();

                return cmd.ExecuteNonQuery() > 0;
            }
            catch
            {
                return false;
            }
        }

        public bool Excluir(int id)
        {
            try
            {
                using SqlConnection conn =
                    new(connectionString);

                string sql =
                    "DELETE FROM Config WHERE ID_CONFIG=@ID_CONFIG";

                using SqlCommand cmd =
                    new(sql, conn);

                cmd.Parameters.AddWithValue(
                    "@ID_CONFIG",
                    id);

                conn.Open();

                return cmd.ExecuteNonQuery() > 0;
            }
            catch
            {
                return false;
            }
        }

        public ModeloConfig? Carregar(int id)
        {
            using SqlConnection conn =
                new(connectionString);

            string sql = @"
            SELECT *
            FROM Config
            WHERE ID_CONFIG=@ID_CONFIG";

            using SqlCommand cmd =
                new(sql, conn);

            cmd.Parameters.AddWithValue(
                "@ID_CONFIG",
                id);

            conn.Open();

            using SqlDataReader dr =
                cmd.ExecuteReader();

            if (dr.Read())
            {
                return PreencherModelo(dr);
            }

            return null;
        }

        public List<ModeloConfig> Listar()
        {
            List<ModeloConfig> lista = [];

            using SqlConnection conn =
                new(connectionString);

            string sql =
                "SELECT * FROM Config ORDER BY ID_CONFIG";

            using SqlCommand cmd =
                new(sql, conn);

            conn.Open();

            using SqlDataReader dr =
                cmd.ExecuteReader();

            while (dr.Read())
            {
                lista.Add(
                    PreencherModelo(dr));
            }

            return lista;
        }

        #endregion

        #region HELPERS

        private static ModeloConfig PreencherModelo(
            SqlDataReader dr)
        {
            ModeloConfig modelo = new();

            PropertyInfo[] props =
                typeof(ModeloConfig)
                .GetProperties();

            foreach (PropertyInfo prop in props)
            {
                try
                {
                    if (dr[prop.Name] != DBNull.Value)
                    {
                        prop.SetValue(
                            modelo,
                            Convert.ToString(
                                dr[prop.Name]));
                    }
                }
                catch
                {
                }
            }

            modelo.ID_CONFIG =
                Convert.ToInt32(
                    dr["ID_CONFIG"]);

            return modelo;
        }

        private static void PreencherParametros(
            SqlCommand cmd,
            ModeloConfig modelo)
        {
            PropertyInfo[] props =
                typeof(ModeloConfig)
                .GetProperties()
                .Where(p => p.Name != "ID_CONFIG")
                .ToArray();

            foreach (PropertyInfo prop in props)
            {
                object? valor =
                    prop.GetValue(modelo);

                cmd.Parameters.AddWithValue(
                    "@" + prop.Name,
                    valor ?? DBNull.Value);
            }
        }

        #endregion
    }
}