{"id":7830,"date":"2011-07-14T18:09:21","date_gmt":"2011-07-14T16:09:21","guid":{"rendered":"https:\/\/www.artera.net\/it\/blog\/?p=7830"},"modified":"2023-02-27T14:48:28","modified_gmt":"2023-02-27T14:48:28","slug":"utilizzare-spring-nelle-web-application-parte-13","status":"publish","type":"post","link":"https:\/\/www.artera.net\/it\/sviluppo\/utilizzare-spring-nelle-web-application-parte-13\/","title":{"rendered":"Utilizzare Spring nelle web application &#8211; parte 13"},"content":{"rendered":"<p><img decoding=\"async\" class=\"alignleft size-full wp-image-6347\" src=\"https:\/\/www.artera.net\/wp-content\/uploads\/2011\/02\/Logo_Spring_252x1501.png\" alt=\"\" width=\"142\" height=\"80\" \/>Nell&#8217;<a title=\"Utilizzare Spring nelle web application - parte 10\" href=\"https:\/\/www.artera.net\/it\/blog\/programmazione\/utilizzare-spring-nelle-web-application-parte-10\" target=\"_blank\" rel=\"noopener noreferrer\">articolo n. 10<\/a> e precedenti abbiamo gi\u00e0 visto come Spring fornisca alcune utilissime <strong>classi per gestire le query SQL<\/strong> tramite JDBC, nascondendone al contempo la complessit\u00e0 di gestione. In questo appuntamento approfondiremo la conoscenza di queste classi esaminando altri casi d&#8217;uso.<\/p>\n<h3>Operazioni SQL come classi<\/h3>\n<p>Una delle innovazioni di Spring JDBC \u00e8 l&#8217;approccio innovativo alla gestione delle comuni operazioni di interazione con il database. Nel nostro caso le query di INSERT e UPDATE possono essere realizzate <strong>modellando le operazioni con la classe <em>org.springframework.jdbc.object.SqlUpdate<\/em><\/strong>. Essendo una classe concreta \u00e8 possibile utilizzarla in due modi:<\/p>\n<ul>\n<li>configurandola tramite i suoi metodi pubblici;<\/li>\n<li>creando una sottoclasse.<\/li>\n<\/ul>\n<p>In entrambi i vantaggi saranno molteplici:<\/p>\n<ul>\n<li>utilizzando Spring-JDBC non dovremo preoccuparci di gestire tutti gli aspetti macchinosi, noiosi e propensi all&#8217;errore di JDBC;<\/li>\n<li>isoleremo ulteriormente la complessit\u00e0 delle query SQL all&#8217;interno di classi specializzate;<\/li>\n<li>le stesse classi specializzate dovrenno solo preoccuparsi di eseguire un <strong>unico compito, ma come si deve<\/strong>, e per fare ci\u00f2 avrenno tutto l&#8217;aiuto possibile dal framework;<\/li>\n<li>sar\u00e0 pi\u00f9 semplice, un domani, cambiare database engine, effettuare il refactoring del database o dello strato di accesso ai dati (Data Access Objects &#8211; DAO (Wikipedia), dato che ci baster\u00e0 modificare (o re-implementare) le singole classi, mantenendo inalterata la classe InsertionDAO.<\/li>\n<\/ul>\n<p>Lo scoglio maggiore \u00e8 rappresentato dal fatto che bisogna imparare a ragionare in maniera leggermente differente, perch\u00e9 siamo di fronte ad un <strong>approccio decisamente object-oriented, contrapposto al tradizionale paradigma <em>imperativo<\/em><\/strong>.<\/p>\n<h3>INSERT e UPDATE con la classe SqlUpdate<\/h3>\n<p>Per realizzare le operazioni utilizzeremo la seconda modalit\u00e0 vista sopra, ovvero definiremo <strong>una sottoclasse di SqlUpdate per ogni operazione<\/strong>, sia essa una insert che un update.<\/p>\n<p>Ecco il sorgente per l&#8217;operazione di INSERT, la classe <em>it.artera.springtut.dao.SqlInsertInsertion<\/em>:<\/p>\n<p>[java]package it.artera.springtut.dao;<\/p>\n<p>import java.sql.Types;<\/p>\n<p>import javax.sql.DataSource;<\/p>\n<p>import it.artera.springtut.model.Insertion;<\/p>\n<p>import org.springframework.jdbc.core.SqlParameter;<br \/>\nimport org.springframework.jdbc.object.SqlUpdate;<br \/>\nimport org.springframework.jdbc.support.GeneratedKeyHolder;<\/p>\n<p>public class SqlInsertInsertion extends SqlUpdate {<\/p>\n<p>    public SqlInsertInsertion(DataSource dataSource) {<br \/>\n        super(dataSource, &quot;INSERT INTO `insertions` (`id`, `title`, `description`, &quot; +<br \/>\n          &quot;`photo`, `price`, `creationDate`) values(?, ?, ?, ?, ?, ?)&quot;);<br \/>\n        declareParameter(new SqlParameter(Types.NUMERIC));<br \/>\n        declareParameter(new SqlParameter(Types.VARCHAR));<br \/>\n        declareParameter(new SqlParameter(Types.LONGVARCHAR));<br \/>\n        declareParameter(new SqlParameter(Types.VARCHAR));<br \/>\n        declareParameter(new SqlParameter(Types.NUMERIC));<br \/>\n        declareParameter(new SqlParameter(Types.DATE));<br \/>\n        setRequiredRowsAffected(1);<\/p>\n<p>        setReturnGeneratedKeys(true);<\/p>\n<p>        compile();<br \/>\n    }<\/p>\n<p>    public void execute(Insertion insertion) {<br \/>\n        KeyHolder keyHolder = new GeneratedKeyHolder();<br \/>\n        update(new Object[] {<br \/>\n              insertion.getId(), insertion.getTitle(), insertion.getDescription(),<br \/>\n              insertion.getPhoto(), insertion.getPrice(),<br \/>\n              insertion.getCreationDate()<br \/>\n            }, keyHolder);<br \/>\n        insertion.setId((Long) keyHolder.getKey());<br \/>\n    }<br \/>\n}[\/java]<\/p>\n<p>Da notare:<\/p>\n<p>&nbsp;<\/p>\n<ul>\n<li>l&#8217;inizializzazione avviene nel costruttore, al quale viene passato un <em>DataSource<\/em> gi\u00e0 inizializzato;<\/li>\n<li>l&#8217;inizializzazione \u00e8 effettuata utilizzando solamente metodi pubblici. Questo significa che sarebbe possibile ottenere lo stesso effetto senza necessariamente creare una sottoclasse;<\/li>\n<li>al costruttore della classe padre vengono passati l&#8217;oggetto <em>dataSource<\/em> e la query SQL da utilizzare;<\/li>\n<li>in una fase successiva viene dichiarato il tipo dei <strong>parametri posizionali utilizzati<\/strong>;<\/li>\n<li>con il metodo <em>setReturnGeneratedKeys(true)<\/em> stiamo indicando la nostra volont\u00e0 di recuperare eventuali chiavi generate durante l&#8217;inserimento. Nell&#8217;<a href=\"https:\/\/www.artera.net\/it\/blog\/programmazione\/utilizzare-spring-nelle-web-application-parte-9\">articolo n.9<\/a> avevamo appunto definito il campo INSERTIONS.ID come <code>id bigint not null auto_increment<\/code>, ci\u00f2 significa che non dovremo valorizzare noi questo campo ma ci penser\u00e0 MySql, assegnandogli un valore incrementale. SqlUpdate ci permette di recuperare tutte le chiavi generate da una INSERT;<\/li>\n<li>specificando <em>setRequiredRowsAffected(1)<\/em> siamo sicuri che in caso di mancato inserimento verr\u00e0 generato un errore;<\/li>\n<li>abbiamo definito un metodo pubblico <em>execute()<\/em>, al quale viene passata un&#8217;istanza di <em>Insertion<\/em> e che si occuper\u00e0 di eseguire l&#8217;operazione <em>update()<\/em>;<\/li>\n<li>notare come l&#8217;ID appena generato venga assegnato alla variabile <em>insertion<\/em>, prelevandolo dal <em>KeyHolder<\/em>.<\/li>\n<\/ul>\n<p>Ed ecco la classe <em>SqlUpdateInsertion<\/em>, che si occupa di aggiornare la tabella:<\/p>\n<p>[java]package it.artera.springtut.dao;<\/p>\n<p>import it.artera.springtut.model.Insertion;<\/p>\n<p>import java.sql.Types;<\/p>\n<p>import javax.sql.DataSource;<\/p>\n<p>import org.springframework.jdbc.core.SqlParameter;<br \/>\nimport org.springframework.jdbc.object.SqlUpdate;<\/p>\n<p>public class SqlUpdateInsertion extends SqlUpdate {<br \/>\n    public SqlUpdateInsertion(DataSource dataSource) {<br \/>\n        super(dataSource,<br \/>\n            &quot;UPDATE `insertions` set `title` = ?, `description` = ?,&quot;<br \/>\n            + &quot; `photo` = ?, `price` = ?,&quot;<br \/>\n            + &quot; `creationDate` = ? where `id` = ?&quot;);<br \/>\n        declareParameter(new SqlParameter(Types.VARCHAR));<br \/>\n        declareParameter(new SqlParameter(Types.LONGVARCHAR));<br \/>\n        declareParameter(new SqlParameter(Types.VARCHAR));<br \/>\n        declareParameter(new SqlParameter(Types.NUMERIC));<br \/>\n        declareParameter(new SqlParameter(Types.DATE));<br \/>\n        declareParameter(new SqlParameter(Types.NUMERIC));<br \/>\n        setRequiredRowsAffected(1);<\/p>\n<p>        compile();<br \/>\n    }<\/p>\n<p>    public void execute(Insertion insertion) {<br \/>\n        update(insertion.getTitle(), insertion.getDescription(), insertion.getPhoto(), insertion.getPrice(),<br \/>\n                insertion.getCreationDate(), insertion.getId());<br \/>\n    }<br \/>\n}[\/java]<\/p>\n<p>Come potete vedere l&#8217;operazione di UPDATE \u00e8 leggermente pi\u00f9 semplice perch\u00e9 non<br \/>\n\u00e8 necessario recuperare chiavi generate.<\/p>\n<p>&nbsp;<\/p>\n<h3>Sviluppi<\/h3>\n<p>Nella prossima puntata vedremo come utilizzare concretamente queste due classi<br \/>\ndal nostro <em>InsertionDao<\/em><\/p>\n<h3>Linkografia<\/h3>\n<ul>\n<li><a href=\"https:\/\/www.artera.net\/it\/blog\/programmazione\/utilizzare-spring-nelle-web-application-parte-9\">Utilizzare Spring nelle web application &#8211; parte 9<\/a>;<\/li>\n<li><a title=\"Utilizzare Spring nelle web application - parte 10\" href=\"https:\/\/www.artera.net\/it\/blog\/programmazione\/utilizzare-spring-nelle-web-application-parte-10\" target=\"_blank\" rel=\"noopener noreferrer\">Utilizzare Spring nelle web application &#8211; parte 10<\/a>;<\/li>\n<li>JDBC Technology &#8211; official documentation (Oracle &#8211; ex Sun);<\/li>\n<li>Data Access Objects &#8211; DAO (Wikipedia);<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p><img decoding=\"async\" class=\"alignleft size-full wp-image-6347\" src=\"https:\/\/www.artera.net\/wp-content\/uploads\/2011\/02\/Logo_Spring_252x1501.png\" alt=\"\" width=\"142\" height=\"80\" \/>Nell&#8217;<a title=\"Utilizzare Spring nelle web application - parte 10\" href=\"https:\/\/www.artera.net\/it\/blog\/programmazione\/utilizzare-spring-nelle-web-application-parte-10\" target=\"_blank\" rel=\"noopener noreferrer\">articolo n. 10<\/a> e precedenti abbiamo gi\u00e0 visto come Spring fornisca alcune utilissime <strong>classi per gestire le query SQL<\/strong> tramite JDBC, nascondendone al contempo la complessit\u00e0 di gestione. In questo appuntamento approfondiremo la conoscenza di queste classi esaminando altri casi d&#8217;uso.<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_eb_attr":"","footnotes":""},"categories":[108],"tags":[225,172,231,215,188],"class_list":["post-7830","post","type-post","status-publish","format-standard","hentry","category-sviluppo","tag-dao","tag-java","tag-jdbc","tag-spring","tag-sql"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\u2022 Utilizzare Spring nelle web application - parte 13 - Artera<\/title>\n<meta name=\"description\" content=\"Leggi dal blog: Utilizzare Spring nelle web application - parte 13. Contattaci per una partnership! 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