{"id":1804,"date":"2024-08-03T08:25:46","date_gmt":"2024-08-03T06:25:46","guid":{"rendered":"https:\/\/blog.sutilweb.eu\/?page_id=1804"},"modified":"2024-08-03T08:25:47","modified_gmt":"2024-08-03T06:25:47","slug":"19-conexion-a-mysql-con-clase-abstracta-php","status":"publish","type":"page","link":"https:\/\/sutilweb.eu\/index.php\/lenguajes\/php\/poo-php\/19-conexion-a-mysql-con-clase-abstracta-php\/","title":{"rendered":"19. Conexi\u00f3n a MySQL con clase abstracta PHP"},"content":{"rendered":"\n

En este cap\u00edtulo vamos a crear un modelo abstracto general<\/strong>, el modelo padre que nos permitir\u00e1 la conexi\u00f3n a la base de datos MySQL<\/strong>. El paradigma que estamos utilizando es el POO<\/strong>, por lo que no vamos a utilizar programaci\u00f3n estructurada<\/strong> ni funcional<\/strong>, que tambi\u00e9n disponemos en PHP<\/strong>.<\/p>\n\n\n\n\n\n\n\n

Vamos a crear una clase abstracta<\/strong> que permite conectarnos y ejecutar queries<\/strong> a nuestra base de datos<\/strong>. Vamos a crear un archivo denominado Model.php<\/em>. Como vemos, el archivo comienza en MAY ya que vamos a trabajar con clases<\/strong>, por lo que el formato de sintaxis es CamelCase<\/strong>.<\/p>\n\n\n\n

Hay que recordar de cap\u00edtulos anteriores, que las clases abstractas<\/strong> pueden tener m\u00e9todos abstractos<\/strong>, que significa que son m\u00e9todos<\/strong> que las clases<\/strong> que hereden de esta clase<\/strong> las van a heredar y se van a implementar en esas clases hijas<\/strong>. En nuestra clase abstracta<\/strong> se definen s\u00f3lo los nombres de esos m\u00e9todos<\/strong>.<\/p>\n\n\n\n

La sintaxis de nuestro archivo Model.php<\/em> ser\u00e1 la siguiente.<\/p>\n\n\n\n

Ejm<\/strong><\/p>\n\n\n\n

<?php\nabstract class Model {\n    \/\/ Atributos\n    private static $db_host = 'localhost';\n    private static $db_user = 'root';\n    private static $db_passwd = 'root';\n    protected $db_name;\n    private static $db_charset = 'utf8';\n    private $conn;\n    protected $query;\n    protected $rows = array();\n\n    \/\/ M\u00e9todos abstractos para CRUD de clases que hereden\n    abstract protected function create();\n    abstract protected function read();\n    abstract protected function update();\n    abstract protected function delete();\n\n    \/\/ M\u00e9todo privado para conectarse a la base de datos\n    private function db_open() {\n        $this->conn = new mysqli(\n            self::$db_host,\n            self::$db_user,\n            self::$db_passwd,\n            $this->db_name\n        );\n\n        $this->conn->set_charset(self::$db_charset);\n    }\n\n    \/\/ M\u00e9todo privado para desconectarse de la base de datos\n    private function db_close() {\n        $this->conn->close();\n    }\n\n    \/\/ Establecer un QUERY simple del tipo INSERT, DELETE, UPDATE\n    protected function set_query() {\n        $this->db_open();\n        $this->conn->query($this->query);\n        $this->db_close();\n    }\n\n    \/\/ Traer resultados de una consulta tipo SELECT en un array\n    protected function get_query() {\n        $this->db_open();\n        $result = $this->conn->query($this->query);\n        while( $this->rows[] = $result->fetch_assoc() );\n        $result->close();\n        $this->db_close();\n        return array_pop($this->rows);\n    }\n}\n?><\/pre>\n","protected":false},"excerpt":{"rendered":"
En este cap\u00edtulo vamos a crear un modelo abstracto general, el modelo padre que nos permitir\u00e1 la conexi\u00f3n a la […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":1735,"menu_order":18,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"class_list":["post-1804","page","type-page","status-publish","hentry"],"uagb_featured_image_src":{"full":false,"thumbnail":false,"medium":false,"medium_large":false,"large":false,"1536x1536":false,"2048x2048":false},"uagb_author_info":{"display_name":"Sutil Web","author_link":"https:\/\/sutilweb.eu\/index.php\/author\/sutilweb\/"},"uagb_comment_info":0,"uagb_excerpt":"En este cap\u00edtulo vamos a crear un modelo abstracto general, el modelo padre que nos permitir\u00e1 la conexi\u00f3n a la […]","_links":{"self":[{"href":"https:\/\/sutilweb.eu\/index.php\/wp-json\/wp\/v2\/pages\/1804","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sutilweb.eu\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/sutilweb.eu\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/sutilweb.eu\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/sutilweb.eu\/index.php\/wp-json\/wp\/v2\/comments?post=1804"}],"version-history":[{"count":2,"href":"https:\/\/sutilweb.eu\/index.php\/wp-json\/wp\/v2\/pages\/1804\/revisions"}],"predecessor-version":[{"id":1806,"href":"https:\/\/sutilweb.eu\/index.php\/wp-json\/wp\/v2\/pages\/1804\/revisions\/1806"}],"up":[{"embeddable":true,"href":"https:\/\/sutilweb.eu\/index.php\/wp-json\/wp\/v2\/pages\/1735"}],"wp:attachment":[{"href":"https:\/\/sutilweb.eu\/index.php\/wp-json\/wp\/v2\/media?parent=1804"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}