{"id":2172,"date":"2016-02-24T09:37:32","date_gmt":"2016-02-24T09:37:31","guid":{"rendered":"https:\/\/www.couchbase.com\/blog\/?p=2172"},"modified":"2019-03-04T01:31:48","modified_gmt":"2019-03-04T09:31:48","slug":"sub-documents-change-only-what-you-need-to","status":"publish","type":"post","link":"https:\/\/www.couchbase.com\/blog\/es\/sub-documents-change-only-what-you-need-to\/","title":{"rendered":"Subdocumentos: busca y modifica s\u00f3lo lo que necesites"},"content":{"rendered":"<p>\u00bfQu\u00e9 diferencia un almac\u00e9n de documentos de un almac\u00e9n de valores clave?<\/p>\n<p>Una base de datos de documentos puede consultar y manipular el contenido de lo que almacena, mientras que el valor sigue siendo un misterio opaco para el almac\u00e9n de clave-valor.<\/p>\n<p>Con Couchbase Server 4.5, hemos introducido nuestra nueva API de sub-documento para darte un mayor acceso de consulta y mutaci\u00f3n a la carne de tus documentos.<\/p>\n<h2>Subdocumentos b\u00e1sicos<\/h2>\n<p>\u00bfCu\u00e1l es el resumen de las nuevas funciones de subdocumento de Couchbase?<\/p>\n<ul>\n<li>Recuperar partes de un documento.<\/li>\n<li>Cambia partes de un documento enviando los cambios a Couchbase Server.<\/li>\n<li>Disponible ahora en todos los SDK oficiales de Couchbase Server.<\/li>\n<li>Complementa la consulta ofrecida por las vistas y la consulta y las mutaciones ofrecidas por N1QL.<\/li>\n<\/ul>\n<p>Bien, pasemos al por qu\u00e9.<\/p>\n<h2>\u00bfPor qu\u00e9 operaciones con subdocumentos?<\/h2>\n<p>Digamos que tenemos un documento JSON de 1 MB en Couchbase que almacena un registro de chat entre dos personas. Cada vez que los participantes en el chat escriben algo nuevo, queremos a\u00f1adirlo al documento de registro.<\/p>\n<p>Sin operaciones de subdocumento, necesitar\u00edamos:<\/p>\n<ol>\n<li>Obtener el documento completo<\/li>\n<li>deserializarlo en su aplicaci\u00f3n<\/li>\n<li>a\u00f1adir la nueva l\u00ednea de la conversaci\u00f3n<\/li>\n<li>serializarlo de nuevo a JSON<\/li>\n<li>enviar el documento completo de vuelta a Couchbase para ser almacenado.<\/li>\n<\/ol>\n<p>Usando el cliente Python de Couchbase, ser\u00eda algo como esto:<\/p>\n<pre><code class=\"language-python\">rv = cb.get('chatlog') # Get the entire document\r\nrv.doc.messages += ['nvm lol'] # Modify the doc locally\r\ncb.replace(rv.key, rv.doc, cas=rv.cas) # Upload entire document again<\/code><\/pre>\n<p>Parece un derroche. Ahora piense en la velocidad a la que la gente suele chatear en las conversaciones de mensajer\u00eda instant\u00e1nea. Luego piensa en cu\u00e1ntos chats simult\u00e1neos podr\u00edan estar teniendo lugar.<\/p>\n<p>Couchbase Server puede desempe\u00f1ar felizmente su papel all\u00ed, pero pone una carga innecesaria en su red y le hace mantener c\u00f3digo de aplicaci\u00f3n para manejar lo que usted podr\u00eda considerar razonablemente como funciones de la capa de base de datos.<\/p>\n<p>Con las operaciones de subdocumento, tenemos que hacer mucho menos. A\u00f1adir una nueva l\u00ednea a un registro de chat se parecer\u00eda m\u00e1s a esto, de nuevo en Python:<\/p>\n<pre><code class=\"language-python\">import couchbase.subdocument as SD\r\ncb.mutate_in('chatlog', SD.append('messages', 'nvm lol'))<\/code><\/pre>\n<p>Enviamos la nueva l\u00ednea a Couchbase Server, especificando el documento y en qu\u00e9 parte del documento hacer el cambio.<\/p>\n<p>De esta forma, conseguimos evitar un viaje de ida y vuelta, ahorrar ancho de banda de red enviando s\u00f3lo lo que ha cambiado y trasladar la responsabilidad de actualizar el documento de la aplicaci\u00f3n a la capa de base de datos.<\/p>\n<h2>Funcionamiento de las operaciones con subdocumentos<\/h2>\n<p>El SDK de Couchbase utiliza tres APIs para trabajar con Couchbase Server:<\/p>\n<ul>\n<li>clave-valor, utilizando el protocolo binario memcached<\/li>\n<li>vistas, utilizando el protocolo REST de CouchDB<\/li>\n<li>N1QL, utilizando el protocolo REST de N1QL.<\/li>\n<\/ul>\n<p>El SDK abstrae los detalles pero, si has trabajado con Couchbase Server, sabr\u00e1s qu\u00e9 tipo de interacci\u00f3n est\u00e1s teniendo.<\/p>\n<p>Las operaciones con subdocumentos se realizan utilizando una extensi\u00f3n del protocolo memcached que gestiona sus operaciones clave-valor.<\/p>\n<h3>Encontrar su subdocumento<\/h3>\n<p>Para realizar una operaci\u00f3n de subdocumento se necesitan dos cosas:<\/p>\n<ul>\n<li>la clave del documento<\/li>\n<li>la ruta del subdocumento dentro del documento padre.<\/li>\n<\/ul>\n<p>\u00bfQu\u00e9 entendemos por camino?<\/p>\n<p>La ruta es la ubicaci\u00f3n dentro del documento donde quieres hacer algo y es la misma notaci\u00f3n utilizada por N1QL.<\/p>\n<p>Digamos que estamos trabajando con perfiles de clientes para una tienda online sencilla. He aqu\u00ed un ejemplo de documento de perfil:<\/p>\n<pre><code class=\"language-JSON\">{\r\n  \"name\": \"Douglas Reynholm\",\r\n  \"email\": \"douglas@reynholmindustries.com\",\r\n  \"addresses\": {\r\n    \"billing\": {\r\n      \"line1\": \"123 Any Street\",\r\n      \"line2\": \"Anytown \",\r\n      \"country\": \"United Kingdom\"\r\n    },\r\n    \"delivery\": {\r\n      \"line1\": \"123 Any Street\",\r\n      \"line2\": \"Anytown \",\r\n      \"country\": \"United Kingdom\"\r\n    }\r\n  },\r\n  \"purchases\": {\r\n    \"complete\": [\r\n      339, 976, 442, 666\r\n    ],\r\n    \"abandoned\": [\r\n      157, 42, 999\r\n    ]\r\n  }\r\n<\/code><\/pre>\n<p>La ruta del campo pa\u00eds en la direcci\u00f3n de entrega de nuestro cliente ser\u00eda:<\/p>\n<pre><code>addresses.delivery.country\r\n<\/code><\/pre>\n<p>Del mismo modo, si las compras se enumeran de nueva a antigua, para encontrar el id de la segunda compra m\u00e1s reciente del cliente utilizar\u00edamos:<\/p>\n<pre><code>purchases.complete[1]\r\n<\/code><\/pre>\n<p>Por lo tanto, nuestro subdocumento es cualquier parte del documento que se encuentre en la ruta que proporcionamos. Podr\u00eda ser un objeto enorme o un solo \u00edndice en una matriz.<\/p>\n<h3>Utilizaci\u00f3n de operaciones con subdocumentos<\/h3>\n<p>A nivel de cubo, las cosas son muy sencillas. S\u00f3lo hay dos m\u00e9todos nuevos:<\/p>\n<ul>\n<li>buscarEn(clave)<\/li>\n<li>mutateIn(clave).<\/li>\n<\/ul>\n<p>En el SDK de Java se implementa utilizando el patr\u00f3n constructor. As\u00ed, estos dos m\u00e9todos de cubo crean para nosotros un objeto, ligado a un documento en particular, donde podemos hacer el trabajo real de consultar o cambiar nuestro sub-documento.<\/p>\n<p>Veamos un ejemplo en Java, en el que buscamos la direcci\u00f3n de entrega de nuestro cliente.<\/p>\n<pre><code class=\"language-java\">LookupInBuilder builder = couchbase.bucket().lookupIn('customer123');\r\n<\/code><\/pre>\n<p>En primer lugar, vamos a crear un objeto constructor que se ceba con el documento de nuestro cliente. A continuaci\u00f3n, podemos realizar las operaciones de sub-documento en ese documento constructor.<\/p>\n<pre><code class=\"language-java\">builder = builder.get(\"addresses.delivery\");\r\nDocumentFragment results = builder.doLookup();\r\n<\/code><\/pre>\n<p>Si estamos utilizando el documento JSON de ejemplo de antes en este post, <em>resultados<\/em> ser\u00e1:<\/p>\n<pre><code class=\"language-JSON\">{\r\n  \"line1\": \"123 Any Street\",\r\n  \"line2\": \"Anytown \",\r\n  \"country\": \"United Kingdom\"\r\n}\r\n<\/code><\/pre>\n<p>Podemos simplificar esta consulta encadenando todo el conjunto:<\/p>\n<pre><code class=\"language-java\">DocumentFragment results = couchbase.bucket().lookupIn('customer123')\r\n  .get(\"addresses.delivery\")\r\n  .doLookup();\r\n<\/code><\/pre>\n<p>A medida que construimos consultas y mutaciones m\u00e1s complejas, podemos encadenar muchas operaciones. En el SDK de Java, <em>doLookup<\/em> indica el final de la consulta y la env\u00eda para su ejecuci\u00f3n.<\/p>\n<p>Como vimos anteriormente en el ejemplo de mensajer\u00eda instant\u00e1nea, tambi\u00e9n podemos modificar documentos utilizando la API de subdocumentos.<\/p>\n<p>Digamos que queremos cambiar algunas partes de la direcci\u00f3n de facturaci\u00f3n de nuestro cliente. En Python, podr\u00edamos utilizar la API de sub-documento para hacerlo as\u00ed:<\/p>\n<pre><code class=\"language-python\">import couchbase.subdocument as SD\r\ncb.mutate_in('customer123',\r\n             SD.upsert('billing.line1', '123 Main St'),\r\n             SD.upsert('billing.line2', 'Somewhere'))\r\n<\/code><\/pre>\n<p>Al igual que en Java, primero seleccionamos el documento por su clave y luego realizamos una serie de operaciones sobre su contenido.<\/p>\n<h2>Pr\u00f3ximos pasos<\/h2>\n<p>Para obtener informaci\u00f3n detallada sobre c\u00f3mo utilizar la API de subdocumentos en su idioma preferido, consulte la documentaci\u00f3n actualizada del SDK.<\/p>\n<p>Tambi\u00e9n puedes leer el post de Mark, de pr\u00f3xima aparici\u00f3n, que entra en m\u00e1s detalles sobre el uso de la API de subdocumentos.<\/p>","protected":false},"excerpt":{"rendered":"<p>What separates a document store from a key-value store? A document database can query and manipulate the contents of what it stores, whereas the value remains an opaque mystery to the key-value store. With Couchbase Server 4.5, we\u2019ve introduced our [&hellip;]<\/p>","protected":false},"author":18,"featured_media":13873,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[1812],"tags":[],"ppma_author":[8982],"class_list":["post-2172","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-n1ql-query"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.5 (Yoast SEO v26.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Sub-documents: find and change only what you need - The Couchbase Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.couchbase.com\/blog\/es\/sub-documents-change-only-what-you-need-to\/\" \/>\n<meta property=\"og:locale\" content=\"es_MX\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Sub-documents: find and change only what you need\" \/>\n<meta property=\"og:description\" content=\"What separates a document store from a key-value store? 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