{"id":132083,"date":"2024-03-25T21:47:22","date_gmt":"2024-03-25T12:47:22","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%a7%e6%89%8b%e5%8b%95%e3%81%a7%e3%83%9a%e3%83%bc%e3%82%b8%e3%83%8d%e3%83%bc%e3%82%b7%e3%83%a7%e3%83%b3%e3%82%af%e3%82%a8%e3%83%aa%e3%82%92%e5%ae%9f%e8%a1%8c%e3%81%99%e3%82%8b%e6%96%b9\/"},"modified":"2024-03-28T01:14:18","modified_gmt":"2024-03-27T16:14:18","slug":"java%e3%81%a7%e6%89%8b%e5%8b%95%e3%81%a7%e3%83%9a%e3%83%bc%e3%82%b8%e3%83%8d%e3%83%bc%e3%82%b7%e3%83%a7%e3%83%b3%e3%82%af%e3%82%a8%e3%83%aa%e3%82%92%e5%ae%9f%e8%a1%8c%e3%81%99%e3%82%8b%e6%96%b9","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%a7%e6%89%8b%e5%8b%95%e3%81%a7%e3%83%9a%e3%83%bc%e3%82%b8%e3%83%8d%e3%83%bc%e3%82%b7%e3%83%a7%e3%83%b3%e3%82%af%e3%82%a8%e3%83%aa%e3%82%92%e5%ae%9f%e8%a1%8c%e3%81%99%e3%82%8b%e6%96%b9\/","title":{"rendered":"Java\u3067\u624b\u52d5\u3067\u30da\u30fc\u30b8\u30cd\u30fc\u30b7\u30e7\u30f3\u30af\u30a8\u30ea\u3092\u5b9f\u884c\u3059\u308b\u65b9\u6cd5\u3092\u6559\u3048\u3066\u304f\u3060\u3055\u3044\u3002"},"content":{"rendered":"<p>Java\u3067\u624b\u52d5\u3067\u30da\u30fc\u30b8\u30f3\u30b0\u30af\u30a8\u30ea\u3092\u5b9f\u884c\u3059\u308b\u306b\u306f\u3001SQL\u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8\u306eLIMIT\u53e5\u3068OFFSET\u53e5\u3092\u4f7f\u7528\u3057\u3066Java\u30b3\u30fc\u30c9\u3068\u7d44\u307f\u5408\u308f\u305b\u3066\u5b9f\u884c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>LIMIT\u53e5\u306f\u7167\u4f1a\u7d50\u679c\u3067\u8fd4\u3059\u30ec\u30b3\u30fc\u30c9\u6570\u3092\u5236\u9650\u3057\u3001 OFFSET\u53e5\u306f\u7167\u4f1a\u7d50\u679c\u306e\u30aa\u30d5\u30bb\u30c3\u30c8\u3092\u6307\u5b9a\u3059\u308b\u305f\u3081\u306b\u4f7f\u308f\u308c\u308b\u3002 \u7167\u4f1a\u6587\u3067LIMIT\u3068OFFSET\u306e\u5024\u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u3067\u3001\u30da\u30fc\u30b8\u30f3\u30b0\u7167\u4f1a\u3092\u884c\u3046\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/p>\n<p>\u4f8b\u3048\u3070\u30012\u30da\u30fc\u30b8\u76ee\u3092\u53d6\u5f97\u3057\u30011\u30da\u30fc\u30b8\u3042\u305f\u308a10\u4ef6\u306e\u30ec\u30b3\u30fc\u30c9\u3092\u8868\u793a\u3059\u308b\u5834\u5408\u3001\u4ee5\u4e0b\u306eSQL\u6587\u3092\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>SELECT * FROM table_name LIMIT <span class=\"hljs-number\">10<\/span> OFFSET <span class=\"hljs-number\">10<\/span>;\r\n<\/code><\/pre>\n<p>Java\u30b3\u30fc\u30c9\u3067\u306f\u3001\u30da\u30fc\u30b8\u756a\u53f7\u30841\u30da\u30fc\u30b8\u3042\u305f\u308a\u306e\u30ec\u30b3\u30fc\u30c9\u6570\u306a\u3069\u306e\u30d1\u30e9\u30e1\u30fc\u30bf\u30fc\u3092\u6e21\u3059\u3053\u3068\u3067\u52d5\u7684\u306b\u691c\u7d22\u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8\u3092\u751f\u6210\u3067\u304d\u307e\u3059\u3002\u307e\u305f\u3001\u691c\u7d22\u7d50\u679c\u3092\u3082\u3068\u306b\u7dcf\u30da\u30fc\u30b8\u6570\u3068\u73fe\u5728\u306e\u30da\u30fc\u30b8\u306e\u958b\u59cb\u30ec\u30b3\u30fc\u30c9\u4f4d\u7f6e\u3092\u8a08\u7b97\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">public<\/span> List&lt;Record&gt; <span class=\"hljs-title function_\">getPage<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">int<\/span> pageNum, <span class=\"hljs-type\">int<\/span> pageSize)<\/span> {\r\n<span class=\"hljs-comment\">\/\/ \u8ba1\u7b97\u8d77\u59cb\u8bb0\u5f55\u4f4d\u7f6e<\/span>\r\n<span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">offset<\/span> <span class=\"hljs-operator\">=<\/span> (pageNum - <span class=\"hljs-number\">1<\/span>) * pageSize;\r\n<span class=\"hljs-comment\">\/\/ \u751f\u6210\u67e5\u8be2\u8bed\u53e5<\/span>\r\n<span class=\"hljs-type\">String<\/span> <span class=\"hljs-variable\">sql<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-string\">\"SELECT * FROM table_name LIMIT ? OFFSET ?\"<\/span>;\r\n<span class=\"hljs-comment\">\/\/ \u6267\u884c\u67e5\u8be2\uff0c\u5e76\u8fd4\u56de\u7ed3\u679c\u96c6<\/span>\r\n<span class=\"hljs-keyword\">try<\/span> (<span class=\"hljs-type\">PreparedStatement<\/span> <span class=\"hljs-variable\">stmt<\/span> <span class=\"hljs-operator\">=<\/span> connection.prepareStatement(sql)) {\r\nstmt.setInt(<span class=\"hljs-number\">1<\/span>, pageSize);\r\nstmt.setInt(<span class=\"hljs-number\">2<\/span>, offset);\r\n<span class=\"hljs-type\">ResultSet<\/span> <span class=\"hljs-variable\">rs<\/span> <span class=\"hljs-operator\">=<\/span> stmt.executeQuery();\r\n<span class=\"hljs-comment\">\/\/ \u5904\u7406\u7ed3\u679c\u96c6\uff0c\u5c06\u67e5\u8be2\u7ed3\u679c\u8f6c\u6362\u4e3a\u5bf9\u8c61\u5217\u8868<\/span>\r\nList&lt;Record&gt; records = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">ArrayList<\/span>&lt;&gt;();\r\n<span class=\"hljs-keyword\">while<\/span> (rs.next()) {\r\n<span class=\"hljs-comment\">\/\/ \u5c06\u67e5\u8be2\u7ed3\u679c\u8f6c\u6362\u4e3a\u5bf9\u8c61\uff0c\u5e76\u6dfb\u52a0\u5230\u5217\u8868\u4e2d<\/span>\r\n<span class=\"hljs-type\">Record<\/span> <span class=\"hljs-variable\">record<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Record<\/span>();\r\n<span class=\"hljs-comment\">\/\/ \u8bbe\u7f6e\u5bf9\u8c61\u5c5e\u6027\u503c<\/span>\r\nrecords.add(record);\r\n}\r\n<span class=\"hljs-keyword\">return<\/span> records;\r\n} <span class=\"hljs-keyword\">catch<\/span> (SQLException e) {\r\n<span class=\"hljs-comment\">\/\/ \u5f02\u5e38\u5904\u7406<\/span>\r\n}\r\n<span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-literal\">null<\/span>;\r\n}\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-type\">int<\/span> <span class=\"hljs-title function_\">getPageCount<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">int<\/span> pageSize)<\/span> {\r\n<span class=\"hljs-comment\">\/\/ \u751f\u6210\u67e5\u8be2\u603b\u8bb0\u5f55\u6570\u7684\u8bed\u53e5<\/span>\r\n<span class=\"hljs-type\">String<\/span> <span class=\"hljs-variable\">sql<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-string\">\"SELECT COUNT(*) FROM table_name\"<\/span>;\r\n<span class=\"hljs-comment\">\/\/ \u6267\u884c\u67e5\u8be2\uff0c\u5e76\u8fd4\u56de\u603b\u8bb0\u5f55\u6570<\/span>\r\n<span class=\"hljs-keyword\">try<\/span> (<span class=\"hljs-type\">Statement<\/span> <span class=\"hljs-variable\">stmt<\/span> <span class=\"hljs-operator\">=<\/span> connection.createStatement()) {\r\n<span class=\"hljs-type\">ResultSet<\/span> <span class=\"hljs-variable\">rs<\/span> <span class=\"hljs-operator\">=<\/span> stmt.executeQuery(sql);\r\n<span class=\"hljs-keyword\">if<\/span> (rs.next()) {\r\n<span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">totalCount<\/span> <span class=\"hljs-operator\">=<\/span> rs.getInt(<span class=\"hljs-number\">1<\/span>);\r\n<span class=\"hljs-comment\">\/\/ \u8ba1\u7b97\u603b\u9875\u6570<\/span>\r\n<span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">pageCount<\/span> <span class=\"hljs-operator\">=<\/span> (totalCount + pageSize - <span class=\"hljs-number\">1<\/span>) \/ pageSize;\r\n<span class=\"hljs-keyword\">return<\/span> pageCount;\r\n}\r\n} <span class=\"hljs-keyword\">catch<\/span> (SQLException e) {\r\n<span class=\"hljs-comment\">\/\/ \u5f02\u5e38\u5904\u7406<\/span>\r\n}\r\n<span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">0<\/span>;\r\n}\r\n<\/code><\/pre>\n<p>getPage\u30e1\u30bd\u30c3\u30c9\u3067\u6307\u5b9a\u3057\u305f\u30da\u30fc\u30b8\u756a\u53f7\u306e\u30c7\u30fc\u30bf\u30ea\u30b9\u30c8\u3092\u53d6\u5f97\u3067\u304d\u3001getPageCount\u30e1\u30bd\u30c3\u30c9\u3067\u7dcf\u30da\u30fc\u30b8\u6570\u3092\u53d6\u5f97\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u3089\u306e2\u3064\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3059\u3053\u3068\u3067\u3001\u624b\u52d5\u30da\u30fc\u30b8\u30f3\u30b0\u30af\u30a8\u30ea\u6a5f\u80fd\u3092\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u3067\u624b\u52d5\u3067\u30da\u30fc\u30b8\u30f3\u30b0\u30af\u30a8\u30ea\u3092\u5b9f\u884c\u3059\u308b\u306b\u306f\u3001SQL\u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8\u306eLIMIT\u53e5\u3068OFFSET\u53e5\u3092\u4f7f\u7528\u3057\u3066Java\u30b3\u30fc\u30c9\u3068\u7d44\u307f\u5408\u308f\u305b\u3066\u5b9f\u884c\u3067\u304d\u307e\u3059\u3002 LIMIT\u53e5\u306f\u7167\u4f1a\u7d50\u679c\u3067\u8fd4\u3059\u30ec\u30b3\u30fc\u30c9\u6570\u3092\u5236\u9650\u3057\u3001 OFFSET\u53e5\u306f\u7167 [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-132083","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) - 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