249 lines
15 KiB
HTML
249 lines
15 KiB
HTML
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>Fede Landing Site</a
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<h1 class="text-4xl font-bold mb-4 text-center">Diseño de Software Incident</h1>
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<div class="text-sm text-gray-600 mb-6 font-mono flex gap-4 justify-center">
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<span>Publicado el: Sep 22, 2023</span>
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<div class="flex gap-2">
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<span class="px-2 py-1 bg-gray-200 rounded-full">#old_blog</span>
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</div>
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</div>
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<div class="prose prose-lg max-w-none mb-12">
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<h1 id="instanciacion-del-sqlconnection">Instanciacion del SqlConnection</h1>
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<div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-csharp" data-lang="csharp"><span style="display:flex;"><span><span style="color:#66d9ef">using</span> (<span style="color:#66d9ef">var</span> connection = <span style="color:#66d9ef">new</span> SqlConnection(configuration.GetConnectionString(<span style="color:#e6db74">"DefaultConnection"</span>)))
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</span></span></code></pre></div><p>Eso genera un sql connection que va a existir hasta que salga del scope del programa.</p>
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<h1 id="creacion-del-sqlcommand">Creacion del SqlCommand</h1>
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<div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-csharp" data-lang="csharp"><span style="display:flex;"><span><span style="color:#66d9ef">using</span> var command = <span style="color:#66d9ef">new</span> SqlCommand();
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</span></span><span style="display:flex;"><span>command.CommandText = <span style="color:#e6db74">"sp_RecuperaProductos"</span>;
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</span></span><span style="display:flex;"><span>command.CommandType = System.Data.CommandType.StoredProcedure;
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</span></span></code></pre></div><h1 id="apertura-de-la-coneccion">Apertura de la coneccion</h1>
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<div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-csharp" data-lang="csharp"><span style="display:flex;"><span>command.Connection = connection;
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</span></span><span style="display:flex;"><span>command.Connection.Open();
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</span></span></code></pre></div><h2 id="utilizacion-del-executereader">Utilizacion del ExecuteReader</h2>
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<p>Es un choclo pero basicamente el codigo de abajo se encarga de iterar por cada uno de las entradas de la tabla. <strong>MUY</strong> importante, se tiene que añadir los productos dentro del loop principal del reader ya que lo que no se guarde en cada iteracion se pierde. (los maps no son case sensitive).</p>
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<div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-csharp" data-lang="csharp"><span style="display:flex;"><span><span style="color:#66d9ef">var</span> reader = command.ExecuteReader();
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</span></span><span style="display:flex;"><span><span style="color:#66d9ef">while</span> (reader.Read())<span style="color:#75715e">//lee a traves de todas las filas que existen en la tabla</span>
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</span></span><span style="display:flex;"><span>{
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</span></span><span style="display:flex;"><span> <span style="color:#75715e">//por cada fila que creo tengo que asignar manualmente cada columna con cada propiedad</span>
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</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">var</span> producto = <span style="color:#66d9ef">new</span> Producto();
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</span></span><span style="display:flex;"><span> producto.Codigo = reader[<span style="color:#e6db74">"Codigo"</span>].ToString();
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</span></span><span style="display:flex;"><span> producto.Nombre = reader[<span style="color:#e6db74">"Nombre"</span>].ToString();
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</span></span><span style="display:flex;"><span> producto.Cantidad = Convert.ToInt32(reader[<span style="color:#e6db74">"Cantidad"</span>].ToString());
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</span></span><span style="display:flex;"><span> producto.CantidadMinima = Convert.ToInt32(reader[<span style="color:#e6db74">"CantidadMinima"</span>].ToString());
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</span></span><span style="display:flex;"><span> producto.Precio = Convert.ToDecimal(reader[<span style="color:#e6db74">"Precio"</span>].ToString());
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</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">var</span> codigoCategoria = reader[<span style="color:#e6db74">"CodigoCategoria"</span>].ToString();
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</span></span><span style="display:flex;"><span> producto.Categoria = RepositorioCategorias.Instancia.RecuperarCategorias().FirstOrDefault(c => c.Codigo == codigoCategoria);
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</span></span><span style="display:flex;"><span> <span style="color:#75715e">//////////////////////////////////////////////////////////////////////////////////////</span>
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</span></span><span style="display:flex;"><span> <span style="color:#75715e">//////////////////////////////////////////////////////////////////////////////////////</span>
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</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">using</span> var commandProveedores = <span style="color:#66d9ef">new</span> SqlCommand();
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</span></span><span style="display:flex;"><span> <span style="color:#75715e">//otra forma de hacerlo es usando Store Procedures</span>
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</span></span><span style="display:flex;"><span> commandProveedores.CommandText = <span style="color:#e6db74">"sp_RecuperarProveedoresProducto"</span>;
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</span></span><span style="display:flex;"><span> commandProveedores.CommandType = System.Data.CommandType.StoredProcedure;
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</span></span><span style="display:flex;"><span> commandProveedores.Parameters.Add(<span style="color:#e6db74">"@CodigoProducto"</span>, System.Data.SqlDbType.NVarChar,<span style="color:#ae81ff">25</span>).Value = producto.Codigo;
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</span></span><span style="display:flex;"><span> <span style="color:#75715e">/////////////////////////</span>
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</span></span><span style="display:flex;"><span> commandProveedores.Connection = connection;
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</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">var</span> readerProveedoresProducto = command.ExecuteReader();
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</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">while</span> (readerProveedoresProducto.Read())<span style="color:#75715e">//lee a traves de todas las filas que existen en la tabla</span>
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</span></span><span style="display:flex;"><span> {
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</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">var</span> codigoProveedor = readerProveedoresProducto[<span style="color:#e6db74">"CodigoProveedor"</span>].ToString();
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</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">var</span> proveedor = RepositorioProveedores.Instancia.RecuperarProveedores().FirstOrDefault(x => x.Codigo == codigoProveedor);
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</span></span><span style="display:flex;"><span> producto.AgregarProveedor(proveedor);
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</span></span><span style="display:flex;"><span> <span style="color:#75715e">//una vez cargado el objeto completo lo agrego a la coleccion</span>
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</span></span><span style="display:flex;"><span>
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</span></span><span style="display:flex;"><span> }
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</span></span><span style="display:flex;"><span>productos.Add(producto);
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</span></span><span style="display:flex;"><span>}
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</span></span></code></pre></div><h1 id="cerrado-de-la-coneccion">Cerrado de la coneccion</h1>
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<p>NOTA: no ser mamerto y cerrar la coneccion fuera del while-loop.</p>
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<div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-csharp" data-lang="csharp"><span style="display:flex;"><span>command.Connection.Close();
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</span></span></code></pre></div><h1 id="sub-query">Sub-Query</h1>
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<div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-csharp" data-lang="csharp"><span style="display:flex;"><span><span style="color:#66d9ef">using</span> var commandProveedores = <span style="color:#66d9ef">new</span> SqlCommand();
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</span></span><span style="display:flex;"><span>
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</span></span><span style="display:flex;"><span>commandProveedores.CommandType = System.Data.CommandType.StoredProcedure;
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</span></span><span style="display:flex;"><span>commandProveedores.CommandText = <span style="color:#e6db74">"SP_AGREGARPROVEEDORPRODUCTO"</span>;
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</span></span><span style="display:flex;"><span>commandProveedores.Connection = connection;
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</span></span><span style="display:flex;"><span>commandProveedores.Transaction = sqlTransaction;
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</span></span><span style="display:flex;"><span>commandProveedores.Parameters.Add(<span style="color:#e6db74">"@CodigoProducto"</span>, System.Data.SqlDbType.NVarChar,<span style="color:#ae81ff">25</span>).Value = producto.Codigo;
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</span></span><span style="display:flex;"><span>commandProveedores.Parameters.Add(<span style="color:#e6db74">"@CodigoProveedor"</span>, System.Data.SqlDbType.NVarChar, <span style="color:#ae81ff">25</span>);
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</span></span><span style="display:flex;"><span><span style="color:#66d9ef">foreach</span> (<span style="color:#66d9ef">var</span> proveedor <span style="color:#66d9ef">in</span> producto.Proveedores)
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</span></span><span style="display:flex;"><span>{
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</span></span><span style="display:flex;"><span> commandProveedores.Parameters[<span style="color:#e6db74">"CodigoProveedor"</span>].Value = proveedor.Codigo;
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</span></span><span style="display:flex;"><span> commandProveedores.ExecuteNonQuery();
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</span></span><span style="display:flex;"><span>}
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</span></span></code></pre></div><h1 id="non-query">Non-Query</h1>
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<p>Un query es una consulta de tipo UPDATE, INSERT, DELETE, para el ExecuteNonQuery se devuelve la cantidad de ramas afectadas, menos en el uso de un StoredProcedure donde devuelve -1.</p>
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<h1 id="notas">Notas</h1>
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<blockquote>
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<p>" Si compila y anda, aprueba " ~Laureano</p></blockquote>
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hover:-translate-y-1
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transition-all duration-100 ease-linear
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