LevelOS-Core/DAL/DALLBancos.cs

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

namespace DAL
{
    public class DALLBancos
    {
        private readonly string connectionString;

        public DALLBancos(string connectionString)
        {
            this.connectionString = connectionString;
        }

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

            string query = @"
            INSERT INTO Bancos
            (
                NUMERO,
                NOME
            )
            VALUES
            (
                @NUMERO,
                @NOME
            )";

            using SqlCommand cmd = new(query, conn);

            PreencherParametros(cmd, modelo);

            conn.Open();

            return cmd.ExecuteNonQuery() > 0;
        }//inserir
        public bool Alterar(ModeloBancos modelo)
        {
            using SqlConnection conn = new(connectionString);

            string query = @"
            UPDATE Bancos
            SET
                NUMERO = @NUMERO,
                NOME = @NOME
            WHERE ID_BANCOS = @ID_BANCOS";

            using SqlCommand cmd = new(query, conn);

            PreencherParametros(cmd, modelo);

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

            conn.Open();

            return cmd.ExecuteNonQuery() > 0;
        }//alterar
        public bool Excluir(int id)
        {
            using SqlConnection conn = new(connectionString);

            string query = "DELETE FROM Bancos WHERE ID_BANCOS = @ID_BANCOS";

            using SqlCommand cmd = new(query, conn);

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

            conn.Open();

            return cmd.ExecuteNonQuery() > 0;
        }//excluir
        public ModeloBancos? ObterPorId(int id)
        {
            using SqlConnection conn = new(connectionString);

            string query = "SELECT * FROM Bancos WHERE ID_BANCOS = @ID_BANCOS";

            using SqlCommand cmd = new(query, conn);

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

            conn.Open();

            using SqlDataReader dr = cmd.ExecuteReader();

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

            return null;
        }//alterar
        public List<ModeloBancos> Listar()
        {
            List<ModeloBancos> lista = [];

            using SqlConnection conn = new(connectionString);

            string query = "SELECT * FROM Bancos ORDER BY NOME";

            using SqlCommand cmd = new(query, conn);

            conn.Open();

            using SqlDataReader dr = cmd.ExecuteReader();

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

            return lista;
        }//Listar
        public List<ModeloBancos> Listar(string valor)
        {
            List<ModeloBancos> lista = [];
            using SqlConnection conn = new(connectionString);
            string query = @"
            SELECT * FROM Bancos
            WHERE NOME LIKE @VALOR
            ORDER BY NOME";
            using SqlCommand cmd = new(query, conn);
            cmd.Parameters.AddWithValue("@VALOR", $"%{valor}%");
            conn.Open();
            using SqlDataReader dr = cmd.ExecuteReader();
            while (dr.Read())
            {
                lista.Add(PreencherModelo(dr));
            }
            return lista;
        }//Listar
        public int ObterQuantidade()
        {
            using SqlConnection conn = new(connectionString);
            string query = "SELECT COUNT(*) FROM Bancos";
            using SqlCommand cmd = new(query, conn);
            conn.Open();
            return Convert.ToInt32(cmd.ExecuteScalar());
        }//ObterQuantidade
        public bool VerificarExistencia(int id)
        {
            using SqlConnection conn = new(connectionString);
            string query = "SELECT COUNT(*) FROM Bancos WHERE ID_BANCOS = @ID_BANCOS";
            using SqlCommand cmd = new(query, conn);
            cmd.Parameters.AddWithValue("@ID_BANCOS", id);
            conn.Open();
            return Convert.ToInt32(cmd.ExecuteScalar()) > 0;
        }//VerificarExistencia
        public DataTable LocalizarTodos()
        {
            using SqlConnection conn = new(connectionString);
                        string query = "SELECT * FROM Bancos";
                        using SqlCommand cmd = new(query, conn);
                        using SqlDataAdapter da = new(cmd);
                        DataTable dt = new();
                        da.Fill(dt);
                        return dt;
        }//LocalizarTodos
        private static ModeloBancos PreencherModelo(SqlDataReader dr)
        {
            return new ModeloBancos
            {
                ID_BANCOS = Convert.ToInt32(dr["ID_BANCOS"]),

                NUMERO = dr["NUMERO"] == DBNull.Value
                    ? string.Empty
                    : Convert.ToString(dr["NUMERO"]) ?? string.Empty,

                NOME = dr["NOME"] == DBNull.Value
                    ? string.Empty
                    : Convert.ToString(dr["NOME"]) ?? string.Empty
            };
        }

        private static void PreencherParametros(SqlCommand cmd, ModeloBancos modelo)
        {
            cmd.Parameters.AddWithValue("@NUMERO",
                string.IsNullOrWhiteSpace(modelo.NUMERO)
                ? DBNull.Value
                : modelo.NUMERO);

            cmd.Parameters.AddWithValue("@NOME",
                string.IsNullOrWhiteSpace(modelo.NOME)
                ? DBNull.Value
                : modelo.NOME);
        }
    }
}