{"id":124781,"date":"2024-03-24T16:25:38","date_gmt":"2024-03-24T07:25:38","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/java-persistencecontext-%e3%82%af%e3%83%a9%e3%82%b9%e3%81%ae%e4%be%8b\/"},"modified":"2024-04-05T14:21:52","modified_gmt":"2024-04-05T05:21:52","slug":"java-persistencecontext-%e3%82%af%e3%83%a9%e3%82%b9%e3%81%ae%e4%be%8b","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java-persistencecontext-%e3%82%af%e3%83%a9%e3%82%b9%e3%81%ae%e4%be%8b\/","title":{"rendered":"Java PersistenceContext \u30af\u30e9\u30b9\u306e\u4f8b"},"content":{"rendered":"<p>\u4ee5\u4e0b\u306f Java \u306e PersistenceContext \u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3059\u308b\u4f8b\u3067\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">import<\/span> javax.persistence.EntityManager;\r\n<span class=\"hljs-keyword\">import<\/span> javax.persistence.PersistenceContext;\r\n<span class=\"hljs-keyword\">import<\/span> javax.transaction.Transactional;\r\n<span class=\"hljs-meta\">@Transactional<\/span>\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">EmployeeService<\/span> {\r\n<span class=\"hljs-meta\">@PersistenceContext<\/span>\r\n<span class=\"hljs-keyword\">private<\/span> EntityManager entityManager;\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">createEmployee<\/span><span class=\"hljs-params\">(Employee employee)<\/span> {\r\nentityManager.persist(employee);\r\n}\r\n<span class=\"hljs-keyword\">public<\/span> Employee <span class=\"hljs-title function_\">getEmployeeById<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">int<\/span> id)<\/span> {\r\n<span class=\"hljs-keyword\">return<\/span> entityManager.find(Employee.class, id);\r\n}\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">updateEmployee<\/span><span class=\"hljs-params\">(Employee employee)<\/span> {\r\nentityManager.merge(employee);\r\n}\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">deleteEmployee<\/span><span class=\"hljs-params\">(Employee employee)<\/span> {\r\nentityManager.remove(employee);\r\n}\r\n}\r\n<\/code><\/pre>\n<p>\u4e0a\u8a18\u306e\u30b3\u30fc\u30c9\u4f8b\u3067\u306f\u3001@PersistenceContext\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u306fEntityManager\u30d5\u30a3\u30fc\u30eb\u30c9\u3092\u30de\u30fc\u30af\u3059\u308b\u305f\u3081\u306b\u7528\u3044\u3089\u308c\u3001Java Persistence API (JPA)\u306b\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u6c38\u7d9a\u5316\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u3092\u4f7f\u7528\u3059\u308b\u3088\u3046\u306b\u6307\u793a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>createEmployee\u30e1\u30bd\u30c3\u30c9\u306f\u3001EntityManager\u306epersist\u30e1\u30bd\u30c3\u30c9\u3092\u7528\u3044\u3066\u3001Employee\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306b\u4fdd\u5b58\u3057\u307e\u3059\u3002<\/p>\n<p>getEmployeeById\u30e1\u30bd\u30c3\u30c9\u306f\u3001EntityManager\u306efind\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001\u6307\u5b9a\u3055\u308c\u305fid\u306b\u57fa\u3065\u3044\u3066Employee\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u53d6\u5f97\u3057\u307e\u3059\u3002<\/p>\n<p>updateEmployee\u30e1\u30bd\u30c3\u30c9\u306fEntityManager\u306emerge\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u66f4\u65b0\u3055\u308c\u305fEmployee\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306b\u4fdd\u5b58\u3057\u307e\u3059\u3002<\/p>\n<p>deleteEmployee\u30e1\u30bd\u30c3\u30c9\u306fEntityManager\u306eremove\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u5185\u306eEmployee\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u524a\u9664\u3059\u308b\u3002<\/p>\n<p>\u4e0a\u8ff0\u4f8b\u306e@Transactional \u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u306f\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u7ba1\u7406\u3092\u6709\u52b9\u306b\u3059\u308b\u305f\u3081\u306e\u3082\u306e\u3067\u3042\u308b\u3053\u3068\u306b\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u64cd\u4f5c\u306f\u3059\u3079\u3066\u30e1\u30bd\u30c3\u30c9\u306e\u5b9f\u884c\u4e2d\u306b1\u3064\u306e\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u306e\u4e2d\u3067\u884c\u308f\u308c\u3001\u30c7\u30fc\u30bf\u306e\u4e00\u8cab\u6027\u304c\u4fdd\u305f\u308c\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4ee5\u4e0b\u306f Java \u306e PersistenceContext \u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3059\u308b\u4f8b\u3067\u3059\u3002 import javax.persistence.EntityManager; import javax.persistence.Pe [&hellip;]<\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-124781","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Java PersistenceContext \u30af\u30e9\u30b9\u306e\u4f8b - Blog - Silicon Cloud<\/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.silicloud.com\/ja\/blog\/java-persistencecontext-\u30af\u30e9\u30b9\u306e\u4f8b\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java PersistenceContext \u30af\u30e9\u30b9\u306e\u4f8b\" \/>\n<meta property=\"og:description\" content=\"\u4ee5\u4e0b\u306f Java \u306e PersistenceContext \u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3059\u308b\u4f8b\u3067\u3059\u3002 import javax.persistence.EntityManager; 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